/* ============================================================
   ZouIC Design System v2.0
   Inspired by GitHub Primer, GitLab Pajamas, and industry best practices
   ============================================================ */

/* --- 1. Design Tokens (CSS Custom Properties) --- */
:root {
    /* Brand colors */
    --color-primary: #00d4aa;
    --color-primary-hover: #00b894;
    --color-primary-muted: rgba(0, 212, 170, 0.15);
    --color-secondary: #0ea5e9;
    --color-secondary-hover: #0284c7;
    --color-secondary-muted: rgba(14, 165, 233, 0.15);
    --color-accent: #8b5cf6;
    --color-accent-hover: #7c3aed;
    --color-accent-muted: rgba(139, 92, 246, 0.15);
    
    /* Neutral palette */
    --color-bg-primary: #0b1120;
    --color-bg-secondary: #131b2e;
    --color-bg-tertiary: #1a2440;
    --color-bg-elevated: #1e293b;
    --color-bg-overlay: rgba(11, 17, 32, 0.92);
    
    /* Text colors */
    --color-text-primary: #e8ecf4;
    --color-text-secondary: #8b95a8;
    --color-text-tertiary: #6b7280;
    --color-text-inverse: #0b1120;
    --color-text-link: var(--color-primary);
    --color-text-link-hover: var(--color-primary-hover);
    
    /* Border colors */
    --color-border-default: #2a3550;
    --color-border-muted: #1e2a45;
    --color-border-accent: var(--color-primary);
    
    /* Status colors */
    --color-success: #10b981;
    --color-success-muted: rgba(16, 185, 129, 0.15);
    --color-warning: #f59e0b;
    --color-warning-muted: rgba(245, 158, 11, 0.15);
    --color-danger: #ef4444;
    --color-danger-muted: rgba(239, 68, 68, 0.15);
    --color-info: var(--color-secondary);
    --color-info-muted: var(--color-secondary-muted);
    
    /* Typography */
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-family-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Consolas', monospace;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --line-height-tight: 1.25;
    --line-height-base: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Spacing (4px base unit) */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Border radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.2);
    --shadow-glow-primary: 0 0 20px rgba(0, 212, 170, 0.15);
    --shadow-glow-accent: 0 0 20px rgba(139, 92, 246, 0.15);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-nav: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-index layers */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    --z-toast: 1080;
}

/* --- 2. Base Styles --- */
*, *::before, *::after {
    box-sizing: border-box;
}

body {
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection {
    background-color: var(--color-primary-muted);
    color: var(--color-primary);
}

/* --- 3. Typography --- */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--color-text-primary);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

@media (max-width: 768px) {
    h1 { font-size: var(--font-size-3xl); }
    h2 { font-size: var(--font-size-2xl); }
    h3 { font-size: var(--font-size-xl); }
}

.text-mono { font-family: var(--font-family-mono); }
.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }
.text-3xl { font-size: var(--font-size-3xl); }
.text-4xl { font-size: var(--font-size-4xl); }
.text-5xl { font-size: var(--font-size-5xl); }

.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }
.text-primary-color { color: var(--color-primary); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-danger { color: var(--color-danger); }

.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

/* --- 4. Navigation --- */
.navbar-zouic {
    background: linear-gradient(90deg, var(--color-bg-primary) 0%, #1e1b4b 100%);
    border-bottom: 1px solid var(--color-border-default);
    transition: transform var(--transition-nav), box-shadow var(--transition-slow);
    z-index: var(--z-fixed);
    min-height: 64px;
}

.navbar-zouic.navbar-hidden {
    transform: translateY(-100%);
}

.navbar-zouic .navbar-brand {
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
    min-height: 44px;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    transition: color var(--transition-fast);
}

.navbar-zouic .navbar-brand:hover {
    color: var(--color-primary);
}

.navbar-zouic .navbar-brand i {
    color: var(--color-primary);
    font-size: var(--font-size-xl);
}

.navbar-zouic .nav-link {
    color: var(--color-text-secondary);
    min-height: 44px;
    display: flex;
    align-items: center;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    position: relative;
}

.navbar-zouic .nav-link:hover {
    color: var(--color-text-primary);
    background-color: var(--color-bg-tertiary);
}

.navbar-zouic .nav-link.active {
    color: var(--color-primary);
}

.navbar-zouic .nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: var(--space-3);
    right: var(--space-3);
    height: 2px;
    background: var(--color-primary);
    border-radius: var(--radius-full);
}

/* Dropdown refinements */
.dropdown-menu-dark {
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--space-2);
}

.dropdown-menu-dark .dropdown-item {
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

.dropdown-menu-dark .dropdown-item:hover {
    color: var(--color-text-primary);
    background-color: var(--color-bg-tertiary);
}

.dropdown-menu-dark .dropdown-item:active {
    color: var(--color-primary);
    background-color: var(--color-primary-muted);
}

/* Mobile navigation */
@media (max-width: 991.98px) {
    .navbar-collapse {
        background-color: var(--color-bg-secondary);
        border-bottom: 1px solid var(--color-border-default);
        box-shadow: var(--shadow-lg);
        max-height: 80vh;
        overflow-y: auto;
    }
    
    .navbar-collapse .navbar-nav {
        padding: var(--space-3);
    }
    
    .navbar-collapse .navbar-nav .nav-item {
        margin-bottom: var(--space-1);
    }
    
    .navbar-zouic .nav-link {
        padding: var(--space-3) var(--space-4);
    }
    
    .navbar-zouic .nav-link.active::after {
        display: none;
    }
    
    .navbar-zouic .nav-link.active {
        background-color: var(--color-primary-muted);
    }
    
    .navbar-collapse .d-flex.gap-3 {
        flex-direction: column;
        padding: var(--space-3);
        border-top: 1px solid var(--color-border-default);
    }
    
    .navbar-collapse .d-flex.gap-3 > * {
        width: 100%;
    }
    
    .dropdown-menu-dark {
        border: none;
        background: transparent;
        padding-left: var(--space-4);
        box-shadow: none;
    }
}

/* --- 5. Card System (Primer-inspired) --- */
.card-zouic {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    overflow: hidden;
}

.card-zouic:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary);
    background-color: var(--color-bg-tertiary);
    box-shadow: var(--shadow-glow-primary);
}

.card-zouic:active {
    transform: translateY(-2px);
}

.card-zouic-header {
    padding: var(--space-4) var(--space-5) 0;
}

.card-zouic-body {
    padding: var(--space-4) var(--space-5);
}

.card-zouic-footer {
    padding: var(--space-3) var(--space-5);
    border-top: 1px solid var(--color-border-muted);
}

.card-zouic-compact {
    padding: var(--space-4);
}

.card-zouic-compact:hover {
    background-color: var(--color-bg-tertiary);
    border-color: var(--color-primary);
}

/* Card variants */
.card-zouic-primary {
    border-color: var(--color-primary-muted);
}

.card-zouic-primary:hover {
    border-color: var(--color-primary);
    box-shadow: 0 0 20px rgba(0, 212, 170, 0.2);
}

.card-zouic-accent {
    border-color: var(--color-accent-muted);
}

.card-zouic-accent:hover {
    border-color: var(--color-accent);
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.2);
}

/* --- 6. Button System --- */
.btn-zouic {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    min-height: 40px;
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-lg);
    border: 1px solid transparent;
    cursor: pointer;
    user-select: none;
    transition: all var(--transition-fast);
    text-decoration: none;
    line-height: 1;
}

.btn-zouic:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.btn-zouic-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-zouic-primary:hover {
    opacity: 0.92;
    box-shadow: var(--shadow-md);
    color: white;
}

.btn-zouic-secondary {
    background-color: transparent;
    border-color: var(--color-border-default);
    color: var(--color-text-primary);
}

.btn-zouic-secondary:hover {
    background-color: var(--color-bg-tertiary);
    border-color: var(--color-text-secondary);
    color: var(--color-text-primary);
}

.btn-zouic-ghost {
    background-color: transparent;
    color: var(--color-text-secondary);
}

.btn-zouic-ghost:hover {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.btn-zouic-sm {
    min-height: 32px;
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-xs);
}

.btn-zouic-lg {
    min-height: 48px;
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-base);
}

/* --- 7. Badge System --- */
.badge-zouic {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-full);
    border: 1px solid transparent;
    line-height: 1.4;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    user-select: none;
}

.badge-zouic-primary {
    background-color: var(--color-primary-muted);
    color: var(--color-primary);
    border-color: rgba(0, 212, 170, 0.3);
}

.badge-zouic-primary:hover {
    background-color: rgba(0, 212, 170, 0.25);
}

.badge-zouic-secondary {
    background-color: var(--color-secondary-muted);
    color: var(--color-secondary);
    border-color: rgba(14, 165, 233, 0.3);
}

.badge-zouic-secondary:hover {
    background-color: rgba(14, 165, 233, 0.25);
}

.badge-zouic-accent {
    background-color: var(--color-accent-muted);
    color: var(--color-accent);
    border-color: rgba(139, 92, 246, 0.3);
}

.badge-zouic-accent:hover {
    background-color: rgba(139, 92, 246, 0.25);
}

.badge-zouic-success {
    background-color: var(--color-success-muted);
    color: var(--color-success);
    border-color: rgba(16, 185, 129, 0.3);
}

.badge-zouic-warning {
    background-color: var(--color-warning-muted);
    color: var(--color-warning);
    border-color: rgba(245, 158, 11, 0.3);
}

.badge-zouic-danger {
    background-color: var(--color-danger-muted);
    color: var(--color-danger);
    border-color: rgba(239, 68, 68, 0.3);
}

/* Badge active state (for filters) */
.badge-zouic.active {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

/* --- 8. Search Input --- */
.input-zouic {
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border-default);
    color: var(--color-text-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
    outline: none;
    width: 100%;
}

.input-zouic:focus {
    background-color: rgba(255, 255, 255, 0.08);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.15);
}

.input-zouic::placeholder {
    color: var(--color-text-tertiary);
}

.input-group-zouic {
    display: flex;
    gap: 0;
}

.input-group-zouic .input-zouic:first-child {
    border-radius: var(--radius-lg) 0 0 var(--radius-lg);
}

.input-group-zouic .btn-zouic:last-child {
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

/* --- 9. Section Titles --- */
.section-title-zouic {
    position: relative;
    padding-bottom: var(--space-3);
    margin-bottom: var(--space-8);
    font-weight: var(--font-weight-bold);
}

.section-title-zouic::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--radius-full);
}

.section-title-zouic.text-center::after {
    left: 50%;
    transform: translateX(-50%);
}

/* --- 10. Hero Section --- */
.hero-zouic {
    background: linear-gradient(135deg, var(--color-bg-primary) 0%, #0f172a 30%, #1e1b4b 60%, var(--color-bg-primary) 100%);
    padding: var(--space-24) 0 var(--space-16);
    position: relative;
    overflow: hidden;
    min-height: 85vh;
    display: flex;
    align-items: center;
}

/* --- Hero decorative elements --- */
.hero-decoration {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
    z-index: 0;
}

.hero-decoration-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(0, 212, 170, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 170, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black 20%, transparent 70%);
}

.hero-decoration-glow {
    position: absolute;
    top: -30%;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 500px;
    background: radial-gradient(ellipse, rgba(0, 212, 170, 0.06) 0%, rgba(139, 92, 246, 0.04) 40%, transparent 70%);
    filter: blur(60px);
    animation: heroGlowPulse 8s ease-in-out infinite;
}

@keyframes heroGlowPulse {
    0%, 100% { opacity: 0.6; transform: translateX(-50%) scale(1); }
    50% { opacity: 1; transform: translateX(-50%) scale(1.1); }
}

.hero-decoration-circle {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(0, 212, 170, 0.08);
}

.hero-decoration-circle-1 {
    top: 10%;
    right: 5%;
    width: 300px;
    height: 300px;
    animation: heroFloat 20s ease-in-out infinite;
}

.hero-decoration-circle-2 {
    bottom: 15%;
    left: 2%;
    width: 200px;
    height: 200px;
    border-color: rgba(139, 92, 246, 0.08);
    animation: heroFloat 25s ease-in-out infinite reverse;
}

.hero-decoration-circle-3 {
    top: 30%;
    left: 40%;
    width: 150px;
    height: 150px;
    border-color: rgba(14, 165, 233, 0.06);
    animation: heroFloat 15s ease-in-out infinite 2s;
}

@keyframes heroFloat {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(30px, -20px) rotate(5deg); }
    50% { transform: translate(-10px, 30px) rotate(-3deg); }
    75% { transform: translate(20px, 10px) rotate(4deg); }
}

/* --- Hero badge --- */
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1) var(--space-4);
    background: linear-gradient(135deg, rgba(0, 212, 170, 0.1), rgba(139, 92, 246, 0.1));
    border: 1px solid rgba(0, 212, 170, 0.2);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    margin-bottom: var(--space-6);
    backdrop-filter: blur(4px);
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--color-primary);
    animation: heroDotPulse 2s ease-in-out infinite;
}

@keyframes heroDotPulse {
    0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(0, 212, 170, 0.4); }
    50% { opacity: 0.8; box-shadow: 0 0 0 6px rgba(0, 212, 170, 0); }
}

/* --- Hero title --- */
.hero-zouic-title {
    font-size: clamp(2.25rem, 5vw, var(--font-size-5xl));
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-4);
    background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* --- Hero subtitle --- */
.hero-zouic-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    max-width: 540px;
    margin-bottom: var(--space-2);
}

/* --- Hero search form --- */
.hero-search-group {
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xl);
    overflow: hidden;
    background-color: var(--color-bg-secondary);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    max-width: 540px;
}

.hero-search-group:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.15);
}

.hero-search-icon {
    background-color: transparent !important;
    border: none !important;
    color: var(--color-text-tertiary);
    padding-left: var(--space-4);
}

.hero-search-input {
    background-color: transparent !important;
    border: none !important;
    color: var(--color-text-primary) !important;
    padding: var(--space-3) var(--space-2);
    font-size: var(--font-size-base);
}

.hero-search-input::placeholder {
    color: var(--color-text-tertiary);
}

.hero-search-btn {
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0 !important;
    padding: var(--space-3) var(--space-6);
    font-weight: var(--font-weight-semibold);
}

/* --- Secondary CTA --- */
.hero-secondary-cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.hero-cta-btn {
    padding: var(--space-2) var(--space-5);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.btn-zouic-ghost {
    background-color: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border-default);
    padding: var(--space-2) var(--space-5);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.btn-zouic-ghost:hover {
    color: var(--color-text-primary);
    border-color: var(--color-text-tertiary);
    background-color: var(--color-bg-elevated);
}

/* --- Hero tags --- */
.hero-tags {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.hero-tags-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-right: var(--space-1);
}

/* --- Hero visual column --- */
.hero-visual-col {
    position: relative;
}

.hero-visual {
    position: relative;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), 0 0 40px rgba(0, 212, 170, 0.08);
}

.hero-visual-image {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-2xl);
    transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.hero-visual:hover .hero-visual-image {
    transform: scale(1.03);
}

.hero-visual-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(11, 17, 32, 0.2) 0%, transparent 50%, rgba(0, 212, 170, 0.05) 100%);
    border-radius: var(--radius-2xl);
    pointer-events: none;
}

/* --- Floating tech icons --- */
.hero-floating-icon {
    position: absolute;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-lg);
    color: var(--color-primary);
    font-size: var(--font-size-lg);
    box-shadow: var(--shadow-lg), 0 0 20px rgba(0, 212, 170, 0.1);
    backdrop-filter: blur(8px);
    animation: heroIconFloat 6s ease-in-out infinite;
    pointer-events: none;
    z-index: 2;
}

.hero-floating-icon-1 {
    top: -16px;
    right: 20%;
    animation-delay: 0s;
    color: var(--color-primary);
}

.hero-floating-icon-2 {
    bottom: 30px;
    left: -20px;
    animation-delay: 1s;
    color: var(--color-secondary);
    border-color: rgba(14, 165, 233, 0.3);
}

.hero-floating-icon-3 {
    top: 25%;
    right: -18px;
    animation-delay: 2s;
    color: var(--color-accent);
    border-color: rgba(139, 92, 246, 0.3);
}

.hero-floating-icon-4 {
    bottom: 15%;
    right: 10%;
    animation-delay: 3s;
    color: #f59e0b;
    border-color: rgba(245, 158, 11, 0.3);
}

.hero-floating-icon-5 {
    top: 10%;
    left: -12px;
    animation-delay: 4s;
    color: #10b981;
    border-color: rgba(16, 185, 129, 0.3);
}

@keyframes heroIconFloat {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-12px); }
}

/* --- Entrance animations --- */
.animate-fade-in-up {
    opacity: 0;
    transform: translateY(24px);
    animation: fadeInUp 0.7s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    opacity: 0;
    animation: fadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes fadeIn {
    to { opacity: 1; }
}

/* --- Responsive hero --- */
@media (max-width: 991px) {
    .hero-zouic {
        min-height: auto;
        padding: var(--space-16) 0 var(--space-12);
    }
    .hero-visual {
        max-width: 480px;
        margin: 0 auto;
    }
    .hero-floating-icon-2 { left: 10px; }
    .hero-floating-icon-5 { left: 10px; }
}

@media (max-width: 768px) {
    .hero-zouic {
        padding: var(--space-12) 0 var(--space-8);
    }
    .hero-zouic-title {
        font-size: var(--font-size-3xl);
    }
    .hero-zouic-subtitle {
        font-size: var(--font-size-base);
    }
    .hero-search-group {
        max-width: 100%;
    }
    .hero-search-btn {
        padding: var(--space-3) var(--space-4);
        font-size: var(--font-size-sm);
    }
    .hero-secondary-cta {
        flex-direction: column;
        align-items: stretch;
    }
    .hero-cta-btn {
        justify-content: center;
    }
    .hero-decoration-circle-1 {
        width: 150px;
        height: 150px;
    }
    .hero-decoration-circle-2 {
        width: 100px;
        height: 100px;
    }
    .hero-decoration-circle-3 {
        display: none;
    }
    .hero-floating-icon {
        width: 36px;
        height: 36px;
        font-size: var(--font-size-base);
    }
    .hero-floating-icon-3 { display: none; }
    .hero-floating-icon-4 { display: none; }
}

@media (max-width: 576px) {
    .hero-zouic {
        padding: var(--space-10) 0 var(--space-6);
    }
    .hero-zouic-title {
        font-size: var(--font-size-2xl);
    }
    .hero-badge {
        font-size: var(--font-size-xs);
        padding: var(--space-1) var(--space-3);
    }
    .hero-floating-icon-1 { display: none; }
}

/* --- 11. Stat Cards --- */
.stat-card {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xl);
    padding: var(--space-4);
    text-align: center;
    transition: all var(--transition-base);
}

.stat-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-primary);
}

.stat-card-icon {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--space-2);
}

.stat-card-value {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
}

.stat-card-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* Enhanced stat cards in hero */
.stat-card-enhanced {
    padding: var(--space-3) var(--space-2);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(4px);
    background-color: rgba(19, 27, 46, 0.8);
    border-color: var(--color-border-muted);
}

.stat-card-enhanced .stat-card-value {
    font-size: var(--font-size-xl);
}

.stat-card-enhanced .stat-card-label {
    font-size: var(--font-size-xs);
}

.stat-card-icon-wrapper {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-2);
    background-color: var(--color-bg-primary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-muted);
}

/* Stagger children animation */
.stagger-children > * {
    opacity: 0;
    transform: translateY(16px);
    animation: staggerFadeIn 0.5s ease-out forwards;
}

.stagger-children > *:nth-child(1) { animation-delay: 0.6s; }
.stagger-children > *:nth-child(2) { animation-delay: 0.7s; }
.stagger-children > *:nth-child(3) { animation-delay: 0.8s; }
.stagger-children > *:nth-child(4) { animation-delay: 0.9s; }

@keyframes staggerFadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- 12. Feature Card (Homepage) --- */
.feature-card {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    text-align: center;
    transition: all var(--transition-base);
    height: 100%;
}

.feature-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow-primary);
}

.feature-card-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-4);
}

.feature-card-icon i {
    font-size: var(--font-size-2xl);
}

.feature-card-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-2);
}

.feature-card-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

/* --- 13. Topic Section (Humanoid Robot, NearLink, RISC-V) --- */
.topic-section {
    padding: var(--space-16) 0;
}

.topic-card {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    text-align: center;
    transition: all var(--transition-base);
    height: 100%;
}

.topic-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.topic-card-icon {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-4);
}

.topic-card-icon i {
    font-size: var(--font-size-4xl);
}

.topic-card-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-2);
}

.topic-card-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
}

/* --- 14. CTA Section --- */
.cta-section {
    padding: var(--space-16) 0;
}

.cta-card {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, #1e1b4b 100%);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    text-align: center;
}

/* --- 15. Footer --- */
.footer-zouic {
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border-default);
    padding: var(--space-8) 0 var(--space-6);
}

.footer-zouic h5 {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-3);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-zouic a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
    padding: var(--space-1) 0;
    display: inline-block;
}

.footer-zouic a:hover {
    color: var(--color-primary);
}

.footer-zouic ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-zouic ul li {
    margin-bottom: var(--space-1);
}

@media (max-width: 768px) {
    .footer-zouic .row {
        gap: var(--space-6);
    }
    .footer-zouic .col-md-3, .footer-zouic .col-md-2 {
        text-align: center;
    }
    .footer-zouic ul {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--space-3);
    }
}

/* --- 16. AI Chat Widget --- */
.chat-widget {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    z-index: var(--z-toast);
}

.chat-widget-container {
    width: 380px;
    height: 500px;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    display: none;
}

.chat-widget-container.open {
    display: flex;
    flex-direction: column;
}

.chat-widget-header {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    padding: var(--space-4);
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-widget-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4);
    background-color: rgba(0, 0, 0, 0.3);
}

.chat-widget-input-area {
    padding: var(--space-3);
    border-top: 1px solid var(--color-border-default);
    background-color: var(--color-bg-secondary);
}

.chat-widget-toggle {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
}

.chat-widget-toggle:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-xl);
}

/* --- 17. Difficulty Badges --- */
.difficulty-beginner {
    background-color: var(--color-success-muted);
    color: var(--color-success);
}

.difficulty-intermediate {
    background-color: var(--color-warning-muted);
    color: var(--color-warning);
}

.difficulty-advanced {
    background-color: var(--color-danger-muted);
    color: var(--color-danger);
}

/* --- 18. Pagination --- */
.pagination-zouic {
    display: flex;
    gap: var(--space-1);
    justify-content: center;
}

.pagination-zouic .page-link {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-default);
    color: var(--color-text-primary);
    border-radius: var(--radius-md);
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
    min-width: 36px;
    text-align: center;
    text-decoration: none;
}

.pagination-zouic .page-link:hover {
    background-color: var(--color-bg-tertiary);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.pagination-zouic .page-item.active .page-link {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-text-inverse);
}

.pagination-zouic .page-item.disabled .page-link {
    opacity: 0.5;
    pointer-events: none;
}

/* --- 19. Utility Classes --- */

/* Spacing */
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

/* Transitions */
.transition-all { transition: all var(--transition-base); }
.transition-transform { transition: transform var(--transition-fast); }
.transition-colors { transition: color var(--transition-fast), background-color var(--transition-fast); }

/* Hover effects */
.hover-lift:hover { transform: translateY(-2px); }
.hover-glow:hover { box-shadow: var(--shadow-glow-primary); }
.hover-underline:hover { text-decoration: underline; }

/* Truncate */
.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.truncate-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* --- 20. Unified Section System --- */
.section-zouic {
    padding: var(--space-10) 0;
}

.section-zouic-alt {
    background-color: var(--color-bg-secondary);
}

.section-zouic-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: var(--space-6);
}

.section-zouic-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1) var(--space-3);
    background: rgba(0, 212, 170, 0.12);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: var(--space-2);
}

.section-zouic-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-1);
}

.section-zouic-desc {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

/* --- 21. Stats Bar --- */
.stats-bar {
    padding: var(--space-6) 0;
    border-top: 1px solid var(--color-border-muted);
    border-bottom: 1px solid var(--color-border-muted);
    background-color: var(--color-bg-secondary);
}

.stats-bar-inner {
    display: flex;
    justify-content: space-around;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.stats-bar-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
}

.stats-bar-number {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    line-height: 1;
}

.stats-bar-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.stats-bar-divider {
    width: 1px;
    height: 40px;
    background-color: var(--color-border-muted);
}

@media (max-width: 768px) {
    .stats-bar-inner {
        gap: var(--space-3);
    }
    .stats-bar-number {
        font-size: var(--font-size-xl);
    }
    .stats-bar-divider:nth-child(4),
    .stats-bar-divider:nth-child(8) {
        display: none;
    }
}

@media (max-width: 576px) {
    .stats-bar-item:last-child {
        display: none;
    }
}

/* --- 22. Hardware Card --- */
.card-zouic-hw {
    display: flex;
    flex-direction: column;
    height: 100%;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-base);
}

.card-zouic-hw:hover {
    border-color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 212, 170, 0.10);
}

.card-zouic-hw-top {
    padding: var(--space-4) var(--space-4) var(--space-3);
    border-bottom: 1px solid var(--color-border-muted);
}

.card-zouic-hw-chip {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    background: var(--color-primary-muted);
    padding: 2px var(--space-2);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-2);
}

.card-zouic-hw-name {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin: 0;
}

.card-zouic-hw-specs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
}

.hw-spec-item {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.hw-spec-label {
    font-size: 10px;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.hw-spec-value {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
}

.card-zouic-hw-desc {
    padding: 0 var(--space-4);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    flex: 1;
}

.card-zouic-hw-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-3) var(--space-4);
    border-top: 1px solid var(--color-border-muted);
    margin-top: var(--space-3);
}

.card-zouic-hw-price {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
}

.card-zouic-hw-peripherals {
    display: flex;
    gap: 4px;
    align-items: center;
}

.peripheral-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--color-primary-muted);
    border: 1px solid var(--color-border-muted);
}

/* --- 23. Project Card --- */
.card-zouic-project {
    display: flex;
    flex-direction: column;
    height: 100%;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-base);
}

.card-zouic-project:hover {
    border-color: var(--color-secondary);
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(14, 165, 233, 0.10);
}

.card-zouic-project-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border-muted);
}

.card-zouic-project-stars {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.card-zouic-project-name {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    padding: var(--space-3) var(--space-4) 0;
    margin: 0;
}

.card-zouic-project-desc {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    padding: var(--space-2) var(--space-4);
    line-height: var(--line-height-relaxed);
    flex: 1;
}

.card-zouic-project-tags {
    padding: 0 var(--space-4) var(--space-3);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1);
}

.card-zouic-project-footer {
    padding: var(--space-3) var(--space-4);
    border-top: 1px solid var(--color-border-muted);
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

/* --- 24. Topic Card Wide --- */
.topic-card-wide {
    border-radius: var(--radius-2xl);
    overflow: hidden;
    height: 100%;
    transition: all var(--transition-base);
}

.topic-card-wide:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.topic-card-wide-bg {
    height: 100%;
    min-height: 320px;
    position: relative;
    border-radius: var(--radius-2xl);
    overflow: hidden;
}

.topic-card-wide-content {
    position: relative;
    z-index: 1;
    padding: var(--space-8) var(--space-6);
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 320px;
}

.topic-card-wide-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-xl);
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-4);
}

.topic-card-wide-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-2);
}

.topic-card-wide-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-4);
    flex: 1;
}

.topic-card-wide-stats {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.topic-card-wide-stats i {
    margin-right: var(--space-1);
}

.topic-card-wide-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    text-decoration: none;
    transition: gap var(--transition-fast);
}

.topic-card-wide-link:hover {
    gap: var(--space-3);
    text-decoration: underline;
}

/* --- 25. Brand Bar --- */
.brand-bar {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-6);
    padding: var(--space-8) 0;
}

.brand-bar-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.brand-bar-logos {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: var(--space-8);
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    padding: var(--space-2) var(--space-4);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.brand-logo:hover {
    color: var(--color-text-primary);
    border-color: var(--color-border-default);
    background-color: var(--color-bg-elevated);
}

.brand-logo i {
    font-size: var(--font-size-lg);
}

@media (max-width: 768px) {
    .brand-bar-logos {
        gap: var(--space-3);
    }
    .brand-logo {
        font-size: var(--font-size-xs);
        padding: var(--space-1) var(--space-3);
    }
}

/* --- 26. Enhanced Feature Card --- */
.feature-card-enhanced {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    text-align: center;
    transition: all var(--transition-base);
    height: 100%;
}

.feature-card-enhanced:hover {
    border-color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 212, 170, 0.08);
}

.feature-card-enhanced-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-4);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-xl);
}

.feature-card-enhanced-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-2);
}

.feature-card-enhanced-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .section-zouic {
        padding: var(--space-6) 0;
    }
    .section-zouic-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
        margin-bottom: var(--space-4);
    }
    .section-zouic-title {
        font-size: var(--font-size-xl);
    }
    .topic-card-wide-bg {
        min-height: 260px;
    }
    .topic-card-wide-content {
        min-height: 260px;
        padding: var(--space-6) var(--space-4);
    }
}

/* --- 20. Section Background Images & Gradients --- */

/* Gradient background variants (replaces blank image files) */
.section-bg-gradient-1 {
    position: relative;
    background: linear-gradient(
        135deg,
        #0b1120 0%,
        #0f1a2e 25%,
        #0d1a3a 50%,
        #0f1a2e 75%,
        #0b1120 100%
    );
}

.section-bg-gradient-1::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 20% 50%, rgba(0, 212, 170, 0.05) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 50%, rgba(139, 92, 246, 0.05) 0%, transparent 60%);
    z-index: 0;
    pointer-events: none;
}

.section-bg-gradient-1 .container {
    position: relative;
    z-index: 1;
}

.section-bg-gradient-2 {
    position: relative;
    background: linear-gradient(
        135deg,
        #0b1120 0%,
        #1a0a2e 25%,
        #0d1a3a 50%,
        #0a1a2e 75%,
        #0b1120 100%
    );
}

.section-bg-gradient-2::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 30% 50%, rgba(139, 92, 246, 0.06) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 50%, rgba(14, 165, 233, 0.06) 0%, transparent 60%);
    z-index: 0;
    pointer-events: none;
}

.section-bg-gradient-2 .container {
    position: relative;
    z-index: 1;
}

.section-bg-gradient-3 {
    position: relative;
    background: linear-gradient(
        135deg,
        #0b1120 0%,
        #0a1a1a 25%,
        #0d1a2e 50%,
        #0a1a1a 75%,
        #0b1120 100%
    );
}

.section-bg-gradient-3::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 30%, rgba(0, 212, 170, 0.08) 0%, transparent 60%);
    z-index: 0;
    pointer-events: none;
}

.section-bg-gradient-3 .container {
    position: relative;
    z-index: 1;
}

/* Topic section background with gradient */
.topic-section-bg {
    position: relative;
    background: linear-gradient(
        135deg,
        #0b1120 0%,
        #0f0a2e 30%,
        #0d1a3a 60%,
        #0b1120 100%
    );
}

.topic-section-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 20% 30%, rgba(139, 92, 246, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 70%, rgba(0, 212, 170, 0.05) 0%, transparent 50%);
    z-index: 0;
    pointer-events: none;
}

.topic-section-bg .container {
    position: relative;
    z-index: 1;
}

/* Why ZouIC section background */
.why-zouic-bg {
    position: relative;
    background: linear-gradient(
        135deg,
        #0b1120 0%,
        #0a1728 30%,
        #0d1a3a 60%,
        #0b1120 100%
    );
}

.why-zouic-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 20%, rgba(0, 212, 170, 0.06) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 80%, rgba(14, 165, 233, 0.05) 0%, transparent 50%);
    z-index: 0;
    pointer-events: none;
}

.why-zouic-bg .container {
    position: relative;
    z-index: 1;
}

/* Community section image */
.community-section-img {
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    position: relative;
    background: linear-gradient(135deg, var(--color-bg-tertiary), var(--color-bg-elevated));
    min-height: 320px;
}

.community-section-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    border-radius: var(--radius-2xl);
    transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.community-section-img:hover img {
    transform: scale(1.03);
}

.community-section-img .community-img-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(11, 17, 32, 0.3) 0%, transparent 60%);
    border-radius: var(--radius-2xl);
    pointer-events: none;
}

/* CTA section background */
.cta-section-bg {
    position: relative;
    background: linear-gradient(
        135deg,
        #0b1120 0%,
        #0a1728 30%,
        #0d1a3a 60%,
        #0b1120 100%
    );
}

.cta-section-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 50%, rgba(0, 212, 170, 0.08) 0%, transparent 60%);
    z-index: 0;
    pointer-events: none;
}

.cta-section-bg .container {
    position: relative;
    z-index: 1;
}

/* Decorative grid pattern overlay for sections */
.section-grid-overlay {
    position: relative;
}

.section-grid-overlay::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    z-index: 0;
    pointer-events: none;
}

.section-grid-overlay > .container {
    position: relative;
    z-index: 1;
}

.truncate-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Back to top */
.back-to-top {
    position: fixed;
    bottom: var(--space-20);
    right: var(--space-6);
    z-index: var(--z-sticky);
    width: 40px;
    height: 40px;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    display: none;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.back-to-top.visible {
    display: flex;
}

.back-to-top:hover {
    background-color: var(--color-bg-tertiary);
    color: var(--color-primary);
    border-color: var(--color-primary);
}

/* Loading skeleton */
.skeleton {
    background: linear-gradient(90deg, var(--color-bg-secondary) 25%, var(--color-bg-tertiary) 50%, var(--color-bg-secondary) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-md);
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: var(--space-16) var(--space-4);
}

.empty-state-icon {
    font-size: var(--font-size-5xl);
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-4);
}

.empty-state-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-2);
}

.empty-state-desc {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
}

/* --- 20. Animations --- */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.animate-fade-in {
    animation: fadeIn var(--transition-slow) ease forwards;
}

.animate-fade-in-up {
    animation: fadeInUp var(--transition-slow) ease forwards;
}

.animate-scale-in {
    animation: scaleIn var(--transition-slow) ease forwards;
}

/* Stagger children */
.stagger-children > * {
    opacity: 0;
    animation: fadeInUp var(--transition-slow) ease forwards;
}

.stagger-children > *:nth-child(1) { animation-delay: 0ms; }
.stagger-children > *:nth-child(2) { animation-delay: 50ms; }
.stagger-children > *:nth-child(3) { animation-delay: 100ms; }
.stagger-children > *:nth-child(4) { animation-delay: 150ms; }
.stagger-children > *:nth-child(5) { animation-delay: 200ms; }
.stagger-children > *:nth-child(6) { animation-delay: 250ms; }

/* --- 21. Responsive Helpers --- */
@media (max-width: 576px) {
    .container {
        padding-left: var(--space-4);
        padding-right: var(--space-4);
    }
    .hide-mobile { display: none !important; }
}

@media (min-width: 577px) and (max-width: 768px) {
    .hide-tablet { display: none !important; }
}

@media (min-width: 769px) {
    .hide-desktop { display: none !important; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* --- 22. Filter Sidebar --- */
.filter-sidebar .filter-group {
    margin-bottom: var(--space-4);
}

.filter-sidebar .filter-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2);
    display: block;
    font-weight: var(--font-weight-medium);
}

.filter-sidebar .filter-options {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

/* Mobile filter toggle */
@media (max-width: 991.98px) {
    .filter-sidebar {
        margin-bottom: var(--space-4);
    }
    .filter-sidebar.collapsed .filter-group {
        display: none;
    }
}

/* --- 23. Detail Page Layout --- */
.detail-header {
    padding: var(--space-12) 0 var(--space-8);
    border-bottom: 1px solid var(--color-border-default);
}

.detail-content {
    padding: var(--space-8) 0;
}

/* --- 24. Toast/Notification --- */
.toast-zouic {
    position: fixed;
    top: var(--space-20);
    right: var(--space-6);
    z-index: var(--z-toast);
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-lg);
    padding: var(--space-3) var(--space-4);
    box-shadow: var(--shadow-lg);
    display: none;
    animation: fadeIn var(--transition-base) ease;
    min-width: 280px;
}

.toast-zouic.show {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.toast-zouic-success { border-left: 3px solid var(--color-success); }
.toast-zouic-error { border-left: 3px solid var(--color-danger); }
.toast-zouic-info { border-left: 3px solid var(--color-secondary); }

/* ============================================================
   --- 25. Hardware Engineer Toolbox ---
   ============================================================ */
.hw-toolbox {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, #1a1a2e 100%);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    position: relative;
    overflow: hidden;
}

.hw-toolbox::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(0, 212, 170, 0.03) 0%, transparent 70%);
    pointer-events: none;
}

.hw-toolbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--space-4);
}

.hw-toolbox-item {
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-xl);
    padding: var(--space-4);
    text-align: center;
    transition: all var(--transition-base);
    cursor: pointer;
    text-decoration: none;
    color: var(--color-text-primary);
}

.hw-toolbox-item:hover {
    border-color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow-primary);
    color: var(--color-text-primary);
}

.hw-toolbox-item-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    background: var(--color-primary-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-3);
}

.hw-toolbox-item-icon i {
    font-size: var(--font-size-xl);
    color: var(--color-primary);
}

.hw-toolbox-item-label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
}

.hw-toolbox-item-value {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin-top: var(--space-1);
}

/* --- 26. Spec Pills (Quick Spec Display) --- */
.spec-pill {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    line-height: 1.2;
    white-space: nowrap;
}

.spec-pill i {
    font-size: 0.625rem;
    color: var(--color-primary);
}

.spec-pill-highlight {
    border-color: var(--color-primary-muted);
    color: var(--color-primary);
}

/* --- 27. Newsletter Signup --- */
.newsletter-card {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, #1e1b4b 100%);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    position: relative;
    overflow: hidden;
}

.newsletter-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -20%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(0, 212, 170, 0.04) 0%, transparent 70%);
    pointer-events: none;
}

.newsletter-form {
    display: flex;
    gap: var(--space-3);
    max-width: 480px;
}

.newsletter-form .input-zouic {
    flex: 1;
    min-height: 48px;
}

.newsletter-benefits {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-top: var(--space-4);
}

.newsletter-benefit {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

.newsletter-benefit i {
    color: var(--color-success);
    font-size: var(--font-size-sm);
}

/* --- 28. Trending / Hot Indicator --- */
.trending-chip {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    font-size: 0.625rem;
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.trending-chip-hot {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.2), rgba(245, 158, 11, 0.2));
    color: #f59e0b;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.trending-chip-new {
    background: linear-gradient(135deg, rgba(0, 212, 170, 0.2), rgba(14, 165, 233, 0.2));
    color: var(--color-primary);
    border: 1px solid rgba(0, 212, 170, 0.3);
}

.trending-chip-trending {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(236, 72, 153, 0.2));
    color: #8b5cf6;
    border: 1px solid rgba(139, 92, 246, 0.3);
}

/* --- 29. Contributor Avatars --- */
.contributor-group {
    display: flex;
    align-items: center;
}

.contributor-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    border: 2px solid var(--color-bg-secondary);
    margin-left: -8px;
    background-color: var(--color-bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    overflow: hidden;
    flex-shrink: 0;
}

.contributor-avatar:first-child {
    margin-left: 0;
}

.contributor-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.contributor-more {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    border: 2px solid var(--color-bg-secondary);
    margin-left: -8px;
    background-color: var(--color-primary-muted);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.625rem;
    font-weight: var(--font-weight-bold);
    flex-shrink: 0;
}

/* --- 30. Toolchain Badge --- */
.toolchain-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    font-size: 0.625rem;
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-sm);
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border-muted);
    color: var(--color-text-secondary);
    line-height: 1;
}

.toolchain-badge i {
    font-size: 0.5rem;
}

.toolchain-badge-supported {
    border-color: rgba(16, 185, 129, 0.3);
    color: var(--color-success);
    background-color: var(--color-success-muted);
}

.toolchain-badge-available {
    border-color: rgba(0, 212, 170, 0.3);
    color: var(--color-primary);
    background-color: var(--color-primary-muted);
}

/* --- 31. Difficulty Meter --- */
.difficulty-meter {
    display: flex;
    gap: 3px;
    align-items: center;
}

.difficulty-meter-bar {
    width: 24px;
    height: 4px;
    border-radius: var(--radius-full);
    background-color: var(--color-border-muted);
    transition: background-color var(--transition-fast);
}

.difficulty-meter-bar.active-beginner {
    background-color: var(--color-success);
}

.difficulty-meter-bar.active-intermediate {
    background-color: var(--color-warning);
}

.difficulty-meter-bar.active-advanced {
    background-color: var(--color-danger);
}

.difficulty-meter-label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    margin-left: var(--space-2);
    color: var(--color-text-secondary);
}

/* --- 32. Compatibility Matrix --- */
.compat-matrix {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: var(--space-2);
}

.compat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-2);
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    text-align: center;
}

.compat-item i {
    font-size: var(--font-size-base);
}

.compat-item-supported {
    border-color: rgba(16, 185, 129, 0.3);
    color: var(--color-success);
}

.compat-item-partial {
    border-color: rgba(245, 158, 11, 0.3);
    color: var(--color-warning);
}

/* --- 33. Engineer Status Badge --- */
.engineer-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    font-size: 0.625rem;
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-accent-muted), var(--color-secondary-muted));
    color: var(--color-accent);
    border: 1px solid rgba(139, 92, 246, 0.3);
    letter-spacing: 0.02em;
}

.engineer-badge i {
    font-size: 0.5rem;
}

/* --- 34. Quick Specs Overlay --- */
.quick-specs {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    padding: var(--space-3) 0;
}

.quick-spec {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 56px;
    padding: var(--space-2) var(--space-3);
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-lg);
}

.quick-spec-value {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    font-family: var(--font-family-mono);
}

.quick-spec-label {
    font-size: 0.625rem;
    color: var(--color-text-tertiary);
    margin-top: var(--space-1);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* --- 35. Feature Comparison Bar --- */
.feature-bar {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-2);
}

.feature-bar-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    min-width: 80px;
    flex-shrink: 0;
}

.feature-bar-track {
    flex: 1;
    height: 6px;
    background-color: var(--color-bg-primary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.feature-bar-fill {
    height: 100%;
    border-radius: var(--radius-full);
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    transition: width var(--transition-slow);
}

.feature-bar-fill-accent {
    background: linear-gradient(90deg, var(--color-accent), #ec4899);
}

.feature-bar-fill-warning {
    background: linear-gradient(90deg, var(--color-warning), var(--color-danger));
}

/* --- 36. Oscilloscope Waveform Decorative Element --- */
.waveform-decoration {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 40px;
    overflow: hidden;
    opacity: 0.08;
    pointer-events: none;
}

.waveform-decoration svg {
    width: 100%;
    height: 100%;
}

/* --- 37. Section Divider with Hardware Theme --- */
.section-divider {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin: var(--space-8) 0;
    color: var(--color-text-tertiary);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.section-divider::before,
.section-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-border-default), transparent);
}

.section-divider i {
    font-size: var(--font-size-sm);
    color: var(--color-primary);
}

/* --- 38. Responsive Hardware Toolkit --- */
@media (max-width: 768px) {
    .hw-toolbox-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .newsletter-form {
        flex-direction: column;
    }
    .newsletter-form .btn-zouic {
        width: 100%;
    }
    .quick-specs {
        gap: var(--space-1);
    }
    .quick-spec {
        min-width: 48px;
        padding: var(--space-1) var(--space-2);
    }
    .compat-matrix {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 576px) {
    .hw-toolbox-grid {
        grid-template-columns: 1fr 1fr;
    }
    .newsletter-card {
        padding: var(--space-6);
    }
    .contributor-avatar {
        width: 28px;
        height: 28px;
        font-size: 0.5rem;
    }
    .contributor-more {
        width: 28px;
        height: 28px;
    }
}