/* ============================================================
   ZouIC Design Optimizations v1.0
   Incremental improvements over zouic-design-system.css
   ============================================================ */

/* --- Smooth scrolling --- */
html {
    scroll-behavior: smooth;
}

/* --- Missing spacing utilities used in templates --- */
.mt-6 { margin-top: var(--space-6) !important; }
.mb-6 { margin-bottom: var(--space-6) !important; }
.mt-8 { margin-top: var(--space-8) !important; }
.mb-8 { margin-bottom: var(--space-8) !important; }
.my-8 {
    margin-top: var(--space-8) !important;
    margin-bottom: var(--space-8) !important;
}
.py-12 {
    padding-top: var(--space-12) !important;
    padding-bottom: var(--space-12) !important;
}
.pt-12 { padding-top: var(--space-12) !important; }
.pb-12 { padding-bottom: var(--space-12) !important; }

/* --- Navbar glassmorphism & mobile toggler --- */
.navbar-zouic {
    background: rgba(11, 17, 32, 0.82);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(42, 53, 80, 0.55);
}

.navbar-zouic.navbar-scrolled {
    background: rgba(11, 17, 32, 0.96);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}

.navbar-zouic .navbar-toggler {
    border-color: rgba(255, 255, 255, 0.12);
    padding: var(--space-2);
}

.navbar-zouic .navbar-toggler-icon {
    width: 1.5em;
    height: 1.5em;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.9%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

.navbar-zouic .navbar-brand {
    letter-spacing: -0.02em;
}

/* --- Hero refinements --- */
.hero-zouic {
    /* 用内容高度驱动，不再用 vh 撑高，避免大屏 / 宽窗口下 hero 出现大片空壳 */
    min-height: 0;
    padding: clamp(40px, 6vh, 72px) 0 clamp(32px, 4vh, 56px);
}

.hero-content-col {
    position: relative;
    z-index: 2;
}

.hero-visual-col {
    position: relative;
    z-index: 2;
}

.hero-search-group {
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
}

.hero-search-input:focus {
    box-shadow: none !important;
}

/* --- Section header consistency --- */
.section-zouic-header {
    align-items: flex-end;
    gap: var(--space-4);
}

.section-zouic-badge {
    border: 1px solid rgba(0, 212, 170, 0.12);
    backdrop-filter: blur(4px);
}

/* --- Topic cards with photographic backgrounds --- */
.topic-card-wide-bg {
    background-size: cover;
    background-position: center;
    position: relative;
}

.topic-card-wide-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(11, 17, 32, 0.82) 0%,
        rgba(11, 17, 32, 0.55) 50%,
        rgba(11, 17, 32, 0.72) 100%
    );
    z-index: 0;
    border-radius: inherit;
}

.topic-card-wide-bg .topic-card-wide-content {
    position: relative;
    z-index: 1;
}

/* --- Card performance & refined motion --- */
.card-zouic,
.card-zouic-hw,
.card-zouic-project,
.feature-card-enhanced,
.hw-toolbox-item {
    will-change: transform;
}

.card-zouic:hover,
.card-zouic-hw:hover,
.card-zouic-project:hover,
.feature-card-enhanced:hover,
.hw-toolbox-item:hover {
    transform: translateY(-5px);
}

/* --- Trending chips refinement --- */
.trending-chip {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* --- Scroll reveal animations ---
   默认完全可见；只有 JS 标记 html 已就绪后才把「未进入视口」的区块收起，
   这样即使 IntersectionObserver 失效、打印、截图或禁用 JS，也绝不会出现整屏空白。 */
.reveal {
    opacity: 1;
    transform: none;
    transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

html.reveal-ready .reveal:not(.visible) {
    opacity: 0;
    transform: translateY(24px);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal.delay-1 { transition-delay: 0.1s; }
.reveal.delay-2 { transition-delay: 0.2s; }
.reveal.delay-3 { transition-delay: 0.3s; }

/* --- Page hero backgrounds --- */
.page-hero {
    position: relative;
    background-color: var(--color-bg-primary);
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    overflow: hidden;
}

.page-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(11, 17, 32, 0.92) 0%, rgba(11, 17, 32, 0.78) 50%, rgba(11, 17, 32, 0.88) 100%);
    z-index: 0;
    pointer-events: none;
}

.page-hero .container {
    position: relative;
    z-index: 1;
}

.page-hero h1,
.page-hero p {
    position: relative;
    z-index: 1;
}

.page-hero-about { background-image: url('/static/images/heroes/about-hero.jpg'); }
.page-hero-products { background-image: url('/static/images/heroes/products-hero.jpg'); }
.page-hero-services { background-image: url('/static/images/heroes/services-hero.jpg'); }
.page-hero-documentation { background-image: url('/static/images/heroes/documentation-hero.jpg'); }
.page-hero-open-source { background-image: url('/static/images/heroes/open-source-hero.jpg'); }
.page-hero-board-guide { background-image: url('/static/images/heroes/board-guide-hero.jpg'); }
.page-hero-news { background-image: url('/static/images/heroes/about-hero.jpg'); }
.page-hero-articles { background-image: url('/static/images/heroes/documentation-hero.jpg'); }
.page-hero-cases { background-image: url('/static/images/heroes/products-hero.jpg'); }
.page-hero-tutorials { background-image: url('/static/images/heroes/documentation-hero.jpg'); }
.page-hero-contribute { background-image: url('/static/images/heroes/open-source-hero.jpg'); }

@media (max-width: 991.98px) {
    .page-hero {
        background-attachment: scroll;
    }
}

/* --- Section background images --- */
.why-zouic-bg {
    background-image:
        linear-gradient(135deg, rgba(11, 17, 32, 0.88) 0%, rgba(11, 17, 32, 0.70) 50%, rgba(11, 17, 32, 0.88) 100%),
        url('/static/images/sections/why-zouic-bg.jpg');
    background-size: cover, cover;
    background-position: center, center;
    background-attachment: fixed, fixed;
}

.cta-section-bg {
    background-image:
        linear-gradient(135deg, rgba(11, 17, 32, 0.85) 0%, rgba(11, 17, 32, 0.65) 50%, rgba(11, 17, 32, 0.85) 100%),
        url('/static/images/sections/cta-bg.jpg');
    background-size: cover, cover;
    background-position: center, center;
    background-attachment: fixed, fixed;
}

@media (max-width: 991.98px) {
    .why-zouic-bg,
    .cta-section-bg {
        background-attachment: scroll, scroll;
    }
}

/* --- Footer refinements --- */
.footer-zouic h5 {
    font-size: var(--font-size-xs);
    letter-spacing: 0.08em;
}

.footer-zouic a {
    position: relative;
}

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

.footer-zouic .btn-zouic-ghost {
    border-color: rgba(255, 255, 255, 0.08);
}

/* --- Newsletter section --- */
.newsletter-card {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

/* --- Back-to-top & chat widget spacing --- */
.back-to-top {
    bottom: var(--space-24);
}

.chat-widget {
    bottom: var(--space-6);
    right: var(--space-6);
}

/* --- AI 水印遮罩：右下角径向渐变遮盖 --- */
/* hero 主图容器（img 标签） */
.hero-visual::after {
    content: '';
    position: absolute;
    right: 0;
    bottom: 0;
    width: max(22vw, 200px);
    height: max(14vw, 110px);
    background: radial-gradient(
        ellipse at 100% 100%,
        rgba(11, 17, 32, 0.95) 0%,
        rgba(11, 17, 32, 0.65) 40%,
        rgba(11, 17, 32, 0.20) 75%,
        rgba(11, 17, 32, 0) 100%
    );
    pointer-events: none;
    z-index: 3;
    border-radius: var(--radius-2xl);
}

/* 内容页 hero 背景（::before 已用于全图渐变，此处用 ::after） */
.page-hero::after {
    content: '';
    position: absolute;
    right: 0;
    bottom: 0;
    width: max(25vw, 240px);
    height: max(16vw, 130px);
    background: radial-gradient(
        ellipse at 100% 100%,
        rgba(11, 17, 32, 0.95) 0%,
        rgba(11, 17, 32, 0.65) 40%,
        rgba(11, 17, 32, 0.20) 75%,
        rgba(11, 17, 32, 0) 100%
    );
    pointer-events: none;
    z-index: 1;
}

/* 专题卡片背景（::after 已用于全图渐变，此处用 ::before） */
.topic-card-wide-bg::before {
    content: '';
    position: absolute;
    right: 0;
    bottom: 0;
    width: max(22vw, 180px);
    height: max(12vw, 90px);
    background: radial-gradient(
        ellipse at 100% 100%,
        rgba(11, 17, 32, 0.92) 0%,
        rgba(11, 17, 32, 0.60) 40%,
        rgba(11, 17, 32, 0.15) 75%,
        rgba(11, 17, 32, 0) 100%
    );
    pointer-events: none;
    z-index: 1;
    border-radius: inherit;
}

/* Why ZouIC / CTA 大区块背景 */
.why-zouic-bg::after,
.cta-section-bg::after {
    content: '';
    position: absolute;
    right: 0;
    bottom: 0;
    width: max(28vw, 260px);
    height: max(18vw, 150px);
    background: radial-gradient(
        ellipse at 100% 100%,
        rgba(11, 17, 32, 0.96) 0%,
        rgba(11, 17, 32, 0.70) 40%,
        rgba(11, 17, 32, 0.25) 75%,
        rgba(11, 17, 32, 0) 100%
    );
    pointer-events: none;
    z-index: 1;
}

/* 移动端缩小遮罩尺寸 */
@media (max-width: 767.98px) {
    .hero-visual::after {
        width: max(28vw, 140px);
        height: max(18vw, 70px);
    }
    .page-hero::after {
        width: max(32vw, 160px);
        height: max(20vw, 85px);
    }
    .topic-card-wide-bg::before {
        width: max(26vw, 130px);
        height: max(14vw, 60px);
    }
    .why-zouic-bg::after,
    .cta-section-bg::after {
        width: max(35vw, 180px);
        height: max(22vw, 90px);
    }
}

/* 打印 / 高对比度模式隐藏遮罩 */
@media print, (prefers-contrast: more) {
    .hero-visual::after,
    .page-hero::after,
    .topic-card-wide-bg::before,
    .why-zouic-bg::after,
    .cta-section-bg::after {
        display: none;
    }
}

@media (max-width: 768px) {
    .back-to-top {
        bottom: var(--space-20);
        right: var(--space-4);
    }
    .chat-widget {
        bottom: var(--space-4);
        right: var(--space-4);
    }
    .chat-widget-container {
        width: calc(100vw - var(--space-8));
        max-width: 360px;
    }
}

/* --- Focus-visible enhancements --- */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* --- Skip link for accessibility --- */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-4);
    z-index: calc(var(--z-fixed) + 10);
    padding: var(--space-3) var(--space-4);
    background: var(--color-primary);
    color: var(--color-text-inverse);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-lg);
    text-decoration: none;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--space-4);
    outline: 2px solid var(--color-text-inverse);
    outline-offset: 2px;
}

/* --- Navbar refinements --- */
.navbar-zouic .container {
    position: relative;
}

.navbar-zouic .nav-link {
    gap: var(--space-1);
}

.navbar-zouic .nav-link.active {
    background-color: rgba(0, 212, 170, 0.08);
}

/* Mobile navigation enhancements */
@media (max-width: 991.98px) {
    .navbar-collapse {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(11, 17, 32, 0.97) !important;
        -webkit-backdrop-filter: blur(20px);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--color-border-default);
        border-radius: 0 0 var(--radius-xl) var(--radius-xl);
        box-shadow: 0 24px 48px rgba(0, 0, 0, 0.45);
        padding: var(--space-3);
        max-height: calc(100vh - 72px);
        overflow-y: auto;
        transform-origin: top;
        transition: opacity var(--transition-base), transform var(--transition-base);
    }

    .navbar-collapse.collapsing {
        opacity: 0;
        transform: scaleY(0.96);
    }

    .navbar-collapse.show {
        opacity: 1;
        transform: scaleY(1);
    }

    .navbar-collapse .navbar-nav {
        padding: 0;
    }

    .navbar-collapse .nav-item {
        margin-bottom: var(--space-1);
    }

    .navbar-zouic .nav-link {
        padding: var(--space-3) var(--space-4);
        border-radius: var(--radius-lg);
        justify-content: flex-start;
    }

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

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

    /* Search form in mobile menu */
    .navbar-collapse #searchForm {
        margin: var(--space-3) 0;
        width: 100%;
    }

    .navbar-collapse #searchForm .input-group-zouic {
        flex-direction: column;
        gap: var(--space-2);
    }

    .navbar-collapse #searchForm .input-zouic {
        width: 100% !important;
        border-radius: var(--radius-lg);
    }

    .navbar-collapse #searchForm .form-select.input-zouic {
        flex: 1 1 auto !important;
        width: 100% !important;
    }

    .navbar-collapse #searchForm .btn-zouic {
        width: 100%;
        justify-content: center;
    }

    /* Auth / language buttons in mobile menu */
    .navbar-collapse .d-flex.gap-2.align-items-center {
        flex-direction: column;
        align-items: stretch !important;
        gap: var(--space-2) !important;
        padding-top: var(--space-3);
        border-top: 1px solid var(--color-border-default);
        margin-top: var(--space-2);
    }

    .navbar-collapse .d-flex.gap-2.align-items-center > * {
        width: 100%;
        justify-content: center;
    }

    .navbar-collapse .dropdown-menu-dark {
        background: var(--color-bg-tertiary);
        border: 1px solid var(--color-border-default);
        margin-top: var(--space-2);
        padding: var(--space-2);
        box-shadow: var(--shadow-lg);
    }
}

/* --- Footer enhancements --- */
.footer-zouic {
    padding-top: var(--space-16);
    padding-bottom: var(--space-8);
}

.footer-main {
    margin-bottom: var(--space-10);
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    text-decoration: none;
    margin-bottom: var(--space-3);
}

.footer-brand i {
    color: var(--color-primary);
}

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

.footer-tagline {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    max-width: 280px;
    margin-bottom: var(--space-3);
}

.footer-meta {
    margin-bottom: var(--space-3);
}

.footer-author {
    font-size: 14px;
    color: var(--color-text-primary);
    margin-bottom: 8px;
}
.footer-author strong {
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
}
.footer-author-handle {
    display: inline-block;
    margin-left: 6px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 12px;
    color: var(--color-text-tertiary);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-muted);
    padding: 1px 7px;
    border-radius: 100px;
}

.footer-slash-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

.footer-slash-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 11px;
    font-weight: 500;
    color: var(--color-text-secondary);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--color-border-muted);
    padding: 2px 9px;
    border-radius: 100px;
    text-decoration: none;
    transition: all 0.18s ease;
}
.footer-slash-tag:hover {
    color: var(--color-text-primary);
    border-color: var(--color-border-default);
    background: rgba(255, 255, 255, 0.08);
}
.footer-slash-tag--highlight {
    color: #4ade80;
    border-color: rgba(74, 222, 128, 0.4);
    background: rgba(74, 222, 128, 0.1);
}
.footer-slash-tag--highlight:hover {
    color: #86efac;
    border-color: rgba(74, 222, 128, 0.6);
    background: rgba(74, 222, 128, 0.18);
}

/* About page — slash identity chips */
.about-slash-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.about-slash-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 500;
    padding: 5px 14px;
    border-radius: 100px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border-default);
    color: var(--color-text-secondary);
}
.about-slash-chip.about-slash-chip--green {
    color: #4ade80;
    border-color: rgba(74, 222, 128, 0.45);
    background: rgba(74, 222, 128, 0.1);
}

.footer-social {
    display: flex;
    gap: var(--space-2);
}

.footer-social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-lg);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-default);
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
    transition: all var(--transition-fast);
}

.footer-social-link:hover {
    background: var(--color-bg-tertiary);
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-2px);
}

.footer-zouic h5 {
    font-size: var(--font-size-xs);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
    font-weight: var(--font-weight-semibold);
}

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

.footer-zouic li {
    margin-bottom: var(--space-3);
}

.footer-zouic li a {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    text-decoration: none;
    transition: color var(--transition-fast), transform var(--transition-fast);
    display: inline-block;
}

.footer-zouic li a:hover {
    color: var(--color-primary);
    transform: translateX(3px);
}

.footer-bottom {
    border-top: 1px solid var(--color-border-default);
    padding-top: var(--space-6);
    text-align: center;
    color: var(--color-text-secondary);
}

.footer-bottom p {
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-2);
}

.footer-bottom a {
    color: var(--color-primary);
    text-decoration: none;
}

.footer-bottom a:hover {
    text-decoration: underline;
}

/* --- Newsletter refinements --- */
.newsletter-card {
    background: linear-gradient(135deg, rgba(0, 212, 170, 0.08) 0%, rgba(139, 92, 246, 0.06) 100%);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
}

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

.newsletter-form .input-zouic {
    flex: 1 1 auto;
    min-width: 0;
}

.newsletter-benefits {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-top: var(--space-4);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

.newsletter-benefit {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
}

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

@media (max-width: 768px) {
    .newsletter-card {
        padding: var(--space-6);
    }

    .newsletter-form {
        flex-direction: column;
    }

    .newsletter-form .btn-zouic {
        width: 100%;
        justify-content: center;
    }

    .newsletter-benefits {
        flex-direction: column;
        gap: var(--space-2);
    }
}

/* --- Mobile footer 2-column compact layout --- */
@media (max-width: 767.98px) {
    .footer-zouic {
        padding-top: var(--space-12);
        padding-bottom: var(--space-6);
    }

    .footer-brand-col {
        text-align: center;
    }

    .footer-tagline {
        margin-left: auto;
        margin-right: auto;
    }

    .footer-social {
        justify-content: center;
    }

    .footer-zouic h5 {
        margin-bottom: var(--space-3);
    }

    .footer-bottom p {
        font-size: var(--font-size-xs);
    }
}

/* --- Scrollbar styling for dark theme --- */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border-default);
    border-radius: var(--radius-full);
    border: 2px solid var(--color-bg-primary);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-tertiary);
}

/* --- Reduced motion respect --- */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
    .navbar-collapse {
        transition: none;
    }
}

/* ===== Author card (IP branding) ===== */
.author-card {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: center;
    justify-content: space-between;
    max-width: 1140px;
    margin: 0 auto;
    padding: 18px 24px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    background: linear-gradient(90deg, rgba(27, 95, 217, 0.14), rgba(27, 95, 217, 0.02));
}
.author-card-info {
    display: flex;
    gap: 14px;
    align-items: center;
}
.author-card-avatar {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: #1b5fd9;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex: 0 0 48px;
}
.author-card-name {
    font-weight: 700;
    font-size: 15px;
}
.author-card-name span {
    color: rgba(255, 255, 255, 0.55);
    font-weight: 500;
}
.author-card-bio {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    margin-top: 2px;
}
.author-card-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}
.author-card-planet {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    border-radius: 999px;
    background: #1b5fd9;
    color: #fff;
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
}
.author-card-planet:hover {
    color: #fff;
    filter: brightness(1.12);
}
.author-card-mp {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    white-space: nowrap;
}
@media (max-width: 768px) {
    .author-card {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ============================================================
   Seeed-inspired information architecture
   Platform tiles / application scenarios / board library tools
   ============================================================ */
.platform-tiles-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-3);
}

.platform-tile {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xl);
    text-decoration: none;
    transition: all var(--transition-base);
}

.platform-tile:hover {
    border-color: var(--color-primary);
    background-color: var(--color-bg-tertiary);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0, 212, 170, 0.12);
}

.platform-tile-icon {
    width: 42px;
    height: 42px;
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: var(--color-primary-muted);
    color: var(--color-primary);
    font-size: 16px;
}

.platform-tile-body {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
    flex: 1;
}

.platform-tile-name {
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--color-text-primary);
}

.platform-tile-desc {
    font-size: 12px;
    line-height: 1.4;
    color: var(--color-text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.platform-tile-count {
    flex: 0 0 auto;
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-primary);
}

.platform-tile-count small {
    margin-left: 2px;
    font-size: 11px;
    font-weight: 500;
    color: var(--color-text-tertiary);
}

.scenario-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-3);
}

.scenario-card {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    padding: var(--space-5);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xl);
    text-decoration: none;
    transition: all var(--transition-base);
}

.scenario-card:hover {
    border-color: var(--color-primary);
    background-color: var(--color-bg-tertiary);
    transform: translateY(-4px);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.25);
}

.scenario-card-icon {
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    font-size: 15px;
}

.scenario-card-title {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-text-primary);
}

.scenario-card-desc {
    font-size: 13px;
    line-height: 1.6;
    color: var(--color-text-secondary);
    padding-right: var(--space-4);
}

.scenario-card-arrow {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    color: var(--color-text-tertiary);
    transition: all var(--transition-fast);
}

.scenario-card:hover .scenario-card-arrow {
    color: var(--color-primary);
    transform: translateX(3px);
}

.boards-page-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.boards-page-stats {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: 13px;
    color: var(--color-text-secondary);
    flex-wrap: wrap;
}

.boards-page-stats strong {
    font-size: 18px;
    color: var(--color-text-primary);
}

.boards-page-stats-divider {
    width: 1px;
    height: 14px;
    background: var(--color-border-default);
}

.board-filter-panel {
    position: sticky;
    top: 92px;
}

.filter-group {
    margin-bottom: var(--space-4);
}

.filter-group-label {
    display: block;
    margin-bottom: 8px;
    font-size: 12px;
    color: var(--color-text-secondary);
}

.filter-chip {
    padding: 6px 12px;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border-default);
    background: transparent;
    color: var(--color-text-secondary);
    font-size: 12px;
    line-height: 1.2;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-chip:hover {
    color: var(--color-text-primary);
    border-color: var(--color-text-secondary);
}

.filter-chip.is-active {
    background: var(--color-primary-muted);
    border-color: rgba(0, 212, 170, 0.4);
    color: var(--color-primary);
}

.filter-reset {
    border: 0;
    background: transparent;
    padding: 0;
    font-size: 12px;
    color: var(--color-text-tertiary);
    cursor: pointer;
}

.filter-reset:hover {
    color: var(--color-primary);
}

.boards-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    flex-wrap: wrap;
    margin-bottom: var(--space-4);
}

.boards-toolbar-search {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
    min-width: 220px;
    height: 44px;
    padding: 0 14px;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-lg);
}

.boards-toolbar-search i {
    color: var(--color-text-tertiary);
}

.boards-toolbar-input {
    flex: 1;
    min-width: 0;
    border: 0;
    outline: none;
    background: transparent;
    color: var(--color-text-primary);
    font-size: 14px;
}

.boards-sort {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0;
    font-size: 13px;
    color: var(--color-text-secondary);
}

.boards-sort-select {
    height: 44px;
    padding: 0 10px;
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-lg);
    background-color: var(--color-bg-secondary);
    color: var(--color-text-primary);
    font-size: 13px;
}

.board-spec-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.board-spec-chip {
    padding: 3px 8px;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border-muted);
    background: rgba(255, 255, 255, 0.04);
    font-size: 11px;
    color: var(--color-text-secondary);
}

.board-card-price {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-primary);
}

.board-card-cta {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-secondary);
}

.board-card:hover .board-card-cta {
    color: var(--color-primary);
}

.board-card-cta i {
    transition: transform var(--transition-fast);
}

.board-card:hover .board-card-cta i {
    transform: translateX(3px);
}

.search-type-chip {
    font: inherit;
    border: 0;
    cursor: pointer;
}

@media (max-width: 991px) {
    .platform-tiles-grid,
    .scenario-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .board-filter-panel {
        position: static;
    }
}

@media (max-width: 575px) {
    .platform-tiles-grid,
    .scenario-grid {
        grid-template-columns: minmax(0, 1fr);
    }

    /* Bootstrap g-5 uses a 48px gutter, wider than the 32px container padding */
    .row.g-5 {
        --bs-gutter-x: 1.5rem;
        --bs-gutter-y: 1.5rem;
    }

    .boards-toolbar-search {
        min-width: 100%;
    }

    .boards-sort {
        width: 100%;
        justify-content: space-between;
    }

    .boards-sort-select {
        flex: 1;
    }
}

/* ============================================================
   External (GitHub) project cards — text-first, no-image friendly
   ============================================================ */
.ext-card {
    display: flex;
    flex-direction: column;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    height: 100%;
}

.ext-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: 0 12px 28px rgba(0, 212, 170, 0.14);
}

.ext-card-cover {
    position: relative;
    display: block;
    height: 180px;
    overflow: hidden;
    border-top-left-radius: var(--radius-xl);
    border-top-right-radius: var(--radius-xl);
}

.ext-card-cover--img {
    background-position: center;
    background-size: cover;
}

.ext-card-cover--img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.ext-card-cover--text {
    display: block;
    position: relative;
    background: var(--ext-palette-bg, linear-gradient(135deg, rgba(0, 212, 170, 0.22), rgba(139, 92, 246, 0.26)));
}

/* 电路走线纹理 + 细密焊点点阵 */
.ext-card-cover--text::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        var(--circuit-texture),
        radial-gradient(rgba(255, 255, 255, 0.14) 1px, transparent 1px);
    background-size: 120px 120px, 18px 18px;
    background-position: 0 0, 4px 4px;
    opacity: 0.85;
    pointer-events: none;
}

/* 底部深角 + 中央浅光斑 */
.ext-card-cover--text::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(ellipse at center 35%, rgba(255, 255, 255, 0.35), transparent 55%),
        linear-gradient(180deg, rgba(0, 0, 0, 0.0) 45%, rgba(0, 0, 0, 0.45) 100%);
    pointer-events: none;
}

/* Slug 水印 — 左下，等宽字体，大字、低透明度 */
.ext-card-cover-slug {
    position: absolute;
    left: 14px;
    bottom: 12px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 11px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.72);
    letter-spacing: 0.02em;
    text-transform: lowercase;
    z-index: 2;
    max-width: 80%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    padding: 2px 7px;
    background: rgba(0, 0, 0, 0.22);
    border-radius: 100px;
    backdrop-filter: blur(3px);
}

/* 首字母容器：相对定位，便于光晕 */
.ext-card-cover-initial-wrap {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
}

/* 光晕层 — 大模糊的同色圆形衬底 */
.ext-card-cover-initial-glow {
    position: absolute;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.18);
    filter: blur(22px);
    transform: scale(1.1);
}

.ext-card-cover-initial {
    font-size: 68px;
    font-weight: 800;
    letter-spacing: -0.04em;
    color: #fff;
    line-height: 1;
    position: relative;
    z-index: 1;
    text-shadow:
        0 2px 0 rgba(0, 0, 0, 0.18),
        0 8px 22px rgba(0, 0, 0, 0.42),
        0 0 40px rgba(255, 255, 255, 0.2);
}

/* 平台徽章 — 右上，稍微上移 */
.ext-card-cover-platform {
    position: absolute;
    top: 12px;
    right: 12px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.94);
    background: rgba(0, 0, 0, 0.32);
    padding: 4px 11px;
    border-radius: 100px;
    backdrop-filter: blur(6px);
    z-index: 3;
    letter-spacing: 0.02em;
}

/* 语言徽章 — 右下 */
.ext-card-cover-lang {
    position: absolute;
    right: 14px;
    bottom: 12px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: rgba(255, 255, 255, 0.85);
    background: rgba(255, 255, 255, 0.14);
    border: 1px solid rgba(255, 255, 255, 0.22);
    padding: 2px 9px;
    border-radius: 100px;
    backdrop-filter: blur(4px);
    z-index: 2;
}

.ext-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.ext-card-tag {
    padding: 2px 9px;
    font-size: 11px;
    line-height: 1.4;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border-muted);
    border-radius: 100px;
    background: rgba(255, 255, 255, 0.04);
    white-space: nowrap;
}

.ext-card-tag--more {
    color: var(--color-text-tertiary);
    border-color: var(--color-border-default);
    background: transparent;
}

.ext-card-stats {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    padding-top: 4px;
}

.ext-card-stats > span {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 11.5px;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 100px;
    background: rgba(255, 255, 255, 0.045);
    border: 1px solid var(--color-border-muted);
    color: var(--color-text-secondary);
}

.ext-card-stats .text-yellow-500 { color: #facc15 !important; }
.ext-card-stats .text-danger   { color: #ef4444 !important; }

/* 底部作者行加"查看详情"渐入箭头 */
.ext-card-footer-arrow {
    margin-left: auto;
    color: var(--color-text-tertiary);
    font-size: 12px;
    opacity: 0;
    transform: translateX(-4px);
    transition: all 0.22s ease;
}
.ext-card:hover .ext-card-footer-arrow {
    opacity: 1;
    transform: translateX(0);
    color: var(--color-primary);
}

/* 描述文字：更紧凑、加微妙行距 */
.ext-card-desc {
    line-height: 1.55;
    font-size: 13px;
}

/* ============================================================
   /all-projects — 页面级布局（页头 / 筛选条 / 自适应网格）
   ============================================================ */

.ext-page {
    padding-bottom: 56px;
}

.ext-hero {
    position: relative;
    padding: 56px 0 40px;
    margin-bottom: 26px;
    overflow: hidden;
    border-bottom: 1px solid var(--color-border-muted);
    background:
        radial-gradient(1100px 380px at 12% -30%, rgba(0, 212, 170, 0.16), transparent 62%),
        radial-gradient(900px 360px at 88% -10%, rgba(139, 92, 246, 0.18), transparent 64%),
        var(--color-bg-primary);
}

.ext-hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
    background-size: 48px 48px;
    pointer-events: none;
    -webkit-mask-image: radial-gradient(ellipse at 50% 0%, #000 30%, transparent 76%);
    mask-image: radial-gradient(ellipse at 50% 0%, #000 30%, transparent 76%);
}

.ext-hero-inner {
    position: relative;
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 36px;
    flex-wrap: wrap;
}

.ext-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 4px 12px;
    border-radius: 100px;
    border: 1px solid rgba(0, 212, 170, 0.3);
    background: rgba(0, 212, 170, 0.1);
    color: var(--color-primary);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.1em;
}

.ext-hero-title {
    margin: 14px 0 12px;
    font-size: clamp(2rem, 4vw, 2.85rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--color-text-primary) 12%, var(--color-primary) 96%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.ext-hero-desc {
    max-width: 620px;
    margin: 0;
    font-size: 15px;
    line-height: 1.68;
    color: var(--color-text-secondary);
}

.ext-hero-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.ext-hero-stat {
    display: flex;
    flex-direction: column;
    gap: 3px;
    min-width: 88px;
    padding: 10px 16px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-default);
    background: rgba(255, 255, 255, 0.03);
    text-decoration: none;
    transition: all 0.2s ease;
}

.ext-hero-stat--total {
    border-color: rgba(0, 212, 170, 0.45);
    background: rgba(0, 212, 170, 0.09);
}

a.ext-hero-stat:hover {
    border-color: var(--color-primary);
    background: rgba(0, 212, 170, 0.12);
    transform: translateY(-2px);
}

.ext-hero-stat-value {
    font-size: 22px;
    font-weight: 700;
    line-height: 1;
    color: var(--color-text-primary);
}

.ext-hero-stat--total .ext-hero-stat-value {
    color: var(--color-primary);
}

.ext-hero-stat-label {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 11.5px;
    color: var(--color-text-secondary);
}

.ext-body {
    padding-top: 4px;
}

/* 筛选条：吸顶 + 毛玻璃 */
.ext-filterbar {
    position: sticky;
    top: 68px;
    z-index: 20;
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
    padding: 16px 18px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border-default);
    background: rgba(15, 23, 42, 0.86);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
}

.ext-filter-row {
    display: flex;
    align-items: flex-start;
    gap: 14px;
}

.ext-filter-label {
    flex: 0 0 auto;
    min-width: 42px;
    padding-top: 6px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
}

.ext-filter-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.ext-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border-radius: 100px;
    border: 1px solid var(--color-border-default);
    background: rgba(255, 255, 255, 0.035);
    color: var(--color-text-secondary);
    font-size: 12.5px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.18s ease;
}

.ext-chip:hover {
    color: var(--color-text-primary);
    border-color: rgba(255, 255, 255, 0.24);
    background: rgba(255, 255, 255, 0.07);
}

.ext-chip.is-active {
    color: #04211c;
    background: var(--color-primary);
    border-color: var(--color-primary);
    font-weight: 600;
}

.ext-chip-count {
    padding: 0 5px;
    border-radius: 100px;
    background: rgba(255, 255, 255, 0.12);
    font-size: 10.5px;
}

.ext-chip.is-active .ext-chip-count {
    background: rgba(0, 0, 0, 0.18);
}

/* 自适应网格：宽屏自动铺满，不留大片空白 */
.ext-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.ext-card-wrap {
    display: flex;
    min-width: 0;
}

.ext-card-wrap > .ext-card {
    width: 100%;
}

/* 卡片内容区：flex 撑满，作者行贴底 */
.ext-card-body {
    display: flex;
    flex-direction: column;
    flex: 1 1 auto;
    padding: 16px 18px 14px;
}

.ext-card-eyebrow {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
}

.ext-card-platform {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 2px 9px;
    border-radius: 100px;
    border: 1px solid rgba(0, 212, 170, 0.28);
    background: rgba(0, 212, 170, 0.1);
    color: var(--color-primary);
    font-size: 11px;
    font-weight: 600;
}

.ext-card-category {
    padding: 2px 9px;
    border-radius: 100px;
    border: 1px solid var(--color-border-muted);
    color: var(--color-text-tertiary);
    font-size: 11px;
}

.ext-card-title {
    margin: 0 0 6px;
    font-size: 16px;
    font-weight: 700;
    line-height: 1.35;
}

.ext-card-title a {
    color: var(--color-text-primary);
    text-decoration: none;
}

.ext-card:hover .ext-card-title a {
    color: var(--color-primary);
}

.ext-card-body .ext-card-desc {
    margin: 0 0 12px;
    color: var(--color-text-secondary);
    font-size: 13px;
    line-height: 1.6;
}

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

.ext-card-body .ext-card-tags {
    margin-bottom: 10px;
}

.ext-card-body .ext-card-stats {
    margin-bottom: 12px;
}

.ext-card-stats > span:nth-child(1) i { color: #facc15; }
.ext-card-stats > span:nth-child(2) i { color: var(--color-text-tertiary); }
.ext-card-stats > span:nth-child(3) i { color: #ef4444; font-size: 0.68em; }

.ext-card-footer {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: auto;
    padding-top: 10px;
    border-top: 1px solid var(--color-border-muted);
}

.ext-card-avatar {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    object-fit: cover;
    flex: 0 0 auto;
}

.ext-card-avatar--empty {
    background: rgba(255, 255, 255, 0.1);
}

.ext-card-author {
    font-size: 12px;
    color: var(--color-text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.ext-card-license {
    margin-left: auto;
    padding: 2px 8px;
    border-radius: 100px;
    border: 1px solid var(--color-border-muted);
    background: rgba(255, 255, 255, 0.05);
    color: var(--color-text-tertiary);
    font-size: 10.5px;
    white-space: nowrap;
}

.ext-card-footer .ext-card-footer-arrow {
    margin-left: 4px;
}

/* 空状态 */
.ext-empty {
    padding: 64px 24px;
    text-align: center;
    border-radius: var(--radius-xl);
    border: 1px dashed var(--color-border-default);
    background: rgba(255, 255, 255, 0.02);
}

.ext-empty i {
    font-size: 40px;
    color: var(--color-text-tertiary);
    margin-bottom: 16px;
    display: block;
}

.ext-empty h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.ext-empty p {
    margin: 0;
    color: var(--color-text-secondary);
    font-size: 14px;
}

/* 分页 */
.ext-pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin: 32px 0 8px;
}

.ext-page-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 10px;
    border-radius: var(--radius-md, 8px);
    border: 1px solid var(--color-border-default);
    background: rgba(255, 255, 255, 0.03);
    color: var(--color-text-secondary);
    font-size: 13px;
    text-decoration: none;
    transition: all 0.18s ease;
}

.ext-page-link:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.ext-page-link.is-active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #04211c;
    font-weight: 700;
}

/* 数据来源 */
.ext-sources {
    margin-top: 40px;
    padding: 24px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border-muted);
    background: rgba(255, 255, 255, 0.02);
}

.ext-sources-head h2 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
}

.ext-sources-head p {
    margin: 0 0 16px;
    color: var(--color-text-secondary);
    font-size: 12.5px;
    line-height: 1.65;
}

.ext-sources-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 10px;
}

.ext-source {
    display: flex;
    align-items: center;
    min-width: 0;
    gap: 8px;
    padding: 10px 12px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-muted);
    background: rgba(255, 255, 255, 0.03);
    color: var(--color-text-secondary);
    font-size: 12.5px;
    text-decoration: none;
    transition: all 0.18s ease;
}

.ext-source:hover {
    border-color: var(--color-primary);
    color: var(--color-text-primary);
}

.ext-source i {
    color: var(--color-primary);
    font-size: 14px;
}

.ext-source-name {
    font-weight: 600;
}

.ext-source-desc {
    margin-left: auto;
    min-width: 0;
    overflow: hidden;
    font-size: 11px;
    color: var(--color-text-tertiary);
    white-space: nowrap;
    text-overflow: ellipsis;
}

@media (max-width: 767px) {
    .ext-hero {
        padding: 36px 0 28px;
    }

    .ext-filterbar {
        position: static;
    }

    .ext-filter-row {
        flex-direction: column;
        gap: 6px;
    }

    .ext-filter-label {
        padding-top: 0;
    }

    .ext-grid {
        grid-template-columns: 1fr;
    }

    .ext-source-desc {
        display: none;
    }
}

/* Detail page — highlight GitHub-style stats when present */
.ext-detail-stats-row {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 1.5rem;
}

.ext-detail-stat-cell {
    padding: 16px;
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--color-border-default);
    text-align: center;
}

.ext-detail-stat-cell .label {
    font-size: 12px;
    color: var(--color-text-secondary);
    margin-bottom: 4px;
}

.ext-detail-stat-cell .value {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-text-primary);
}

.ext-detail-taglist {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

/* page-agent 浮层（alibaba/page-agent 注入，id 前缀 page-agent-runtime_）：
   窄屏/平板下默认是宽度约等于视口的底栏，会压住图表和正文右下角。
   库会用内联样式持续锁住 transform / opacity / scale，改成在 lg 以下直接隐藏，桌面端不受影响。 */
@media (max-width: 991.98px) {
    div[id^="page-agent-runtime_"] {
        display: none !important;
    }
}

.ext-detail-tag {
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 12px;
    color: var(--color-text-primary);
    background: rgba(0, 212, 170, 0.14);
    border: 1px solid rgba(0, 212, 170, 0.3);
}

/* 电路走线纹理（PCB traces），整站共用 */
:root {
    --circuit-texture: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120' viewBox='0 0 120 120'%3E%3Cg fill='none' stroke='%23ffffff' stroke-opacity='0.13' stroke-width='1.5'%3E%3Cpath d='M0 24h44v32h32'/%3E%3Cpath d='M120 40H84v36'/%3E%3Cpath d='M20 120V84h32'/%3E%3Cpath d='M68 120V96h52'/%3E%3Cpath d='M0 64h28'/%3E%3Cpath d='M96 0v20'/%3E%3C/g%3E%3Cg fill='%23ffffff' fill-opacity='0.2'%3E%3Ccircle cx='44' cy='24' r='3'/%3E%3Ccircle cx='76' cy='56' r='3'/%3E%3Ccircle cx='84' cy='76' r='3'/%3E%3Ccircle cx='20' cy='84' r='3'/%3E%3Ccircle cx='52' cy='84' r='3'/%3E%3Ccircle cx='68' cy='96' r='3'/%3E%3Ccircle cx='28' cy='64' r='3'/%3E%3Ccircle cx='96' cy='20' r='3'/%3E%3C/g%3E%3C/svg%3E");
}

/* 板卡头图：渐变 + 电路纹理 + 顶部高光 */
.board-visual {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 6px;
    overflow: hidden;
    border-radius: 12px;
}

.board-visual::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: var(--circuit-texture);
    background-size: 120px 120px;
    pointer-events: none;
}

.board-visual::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 30% 18%, rgba(255, 255, 255, 0.16), transparent 55%);
    pointer-events: none;
}

.board-visual > * {
    position: relative;
    z-index: 1;
}

.board-visual-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.14);
    border: 1px solid rgba(255, 255, 255, 0.28);
    backdrop-filter: blur(4px);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);
}

.board-visual-chip i {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.95);
}

.board-visual-label {
    color: rgba(255, 255, 255, 0.88);
    font-size: 12px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
}

/* Platform palettes — consumed by ext-card-cover--text */
.ext-card--github {
    --ext-palette-bg: linear-gradient(135deg, rgba(36, 41, 47, 0.78), rgba(33, 150, 243, 0.45));
}

.ext-card--seeed {
    --ext-palette-bg: linear-gradient(135deg, rgba(46, 125, 50, 0.55), rgba(255, 152, 0, 0.4));
}

.ext-card--crowdsupply {
    --ext-palette-bg: linear-gradient(135deg, rgba(0, 212, 170, 0.32), rgba(14, 165, 233, 0.32));
}

.ext-card--hackaday {
    --ext-palette-bg: linear-gradient(135deg, rgba(245, 158, 11, 0.38), rgba(239, 68, 68, 0.3));
}

.ext-card--hackster {
    --ext-palette-bg: linear-gradient(135deg, rgba(16, 185, 129, 0.32), rgba(59, 130, 246, 0.32));
}

.ext-card--web {
    --ext-palette-bg: linear-gradient(135deg, rgba(99, 102, 241, 0.30), rgba(148, 163, 184, 0.26));
}


/* ==========================================================
   ZouIC 2026-10-31 优化层
   目标：中文可读性、视觉降噪、移动端手感、转化入口强化
   约束：只作用于视觉与排版，不改业务逻辑、不删功能
   ========================================================== */

/* 1. 正文字体：移除 Inter / system-ui 依赖，改中文优先的系统字体栈（零额外请求） */
:root {
    --font-family-base: 'PingFang SC', 'HarmonyOS Sans SC', 'MiSans', 'Noto Sans SC',
                       'Hiragino Sans GB', 'Microsoft YaHei', 'Source Han Sans SC', sans-serif;
}

/* 2. 中文阅读：行高、行宽、次要文字对比度 */
body {
    line-height: 1.75;
}
.hero-zouic-subtitle,
.section-zouic-subtitle,
.zlead-card p,
.text-lg,
.hero-source-line {
    line-height: 1.85;
    max-width: 68ch;
}
.text-secondary {
    color: #a5b0c3;
}

/* 3. 首屏标题：去掉渐变文字（可读性与降级风险），改为实心色 */
.hero-zouic-title {
    background: none;
    -webkit-text-fill-color: currentColor;
    color: var(--color-text-primary);
    line-height: 1.28;
}

/* 4. 背景降噪：重复的渐变背景统一为「主色 + 次级色」两级底色 */
.section-bg-gradient-1,
.section-bg-gradient-2,
.section-bg-gradient-3,
.topic-section-bg,
.why-zouic-bg,
.cta-section-bg {
    background: var(--color-bg-primary);
}
.section-bg-gradient-1::before,
.section-bg-gradient-2::before,
.section-bg-gradient-3::before,
.topic-section-bg::before,
.why-zouic-bg::before,
.cta-section-bg::before {
    background-image: none;
}
.section-zouic-alt {
    background-color: var(--color-bg-secondary);
}
/* 网格叠加纹理：保留结构感，压到极弱 */
.section-grid-overlay::after {
    opacity: .3;
}

/* 5. 动效收敛：尊重系统「减弱动态效果」偏好 */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .01ms !important;
        scroll-behavior: auto !important;
    }
}

/* 6. 转化入口：导航栏「商务合作」 */
.nav-link-business {
    color: var(--color-text-primary);
    font-weight: 600;
    position: relative;
}
.nav-link-business::after {
    content: '';
    position: absolute;
    left: .75rem;
    right: .75rem;
    bottom: .35rem;
    height: 2px;
    border-radius: 2px;
    background: var(--color-primary);
}

/* 7. 首屏：企业客户入口 */
.hero-business-lead {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    flex-wrap: wrap;
    margin: 0 0 1.25rem;
    padding: .55rem .95rem;
    border: 1px solid var(--color-border-default);
    border-radius: 999px;
    background: rgba(0, 212, 170, .06);
    color: var(--color-text-primary);
    font-size: .9rem;
    text-decoration: none;
    transition: border-color var(--transition-fast), background var(--transition-fast);
}
.hero-business-lead:hover,
.hero-business-lead:focus-visible {
    border-color: var(--color-primary);
    background: rgba(0, 212, 170, .12);
    color: #fff;
}
.hero-business-lead-label {
    color: var(--color-primary);
    font-weight: 600;
}
.hero-business-lead i {
    color: var(--color-primary);
    font-size: .78rem;
}

/* 8. 页脚商务联系 */
.footer-business-contact {
    margin: .75rem 0 0;
    font-size: .9rem;
    color: var(--color-text-secondary);
}
.footer-business-contact a {
    color: var(--color-text-primary);
    text-decoration: none;
    border-bottom: 1px solid var(--color-border-default);
}
.footer-business-contact a:hover {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

/* 9. 移动端：字号、触控目标、按钮宽度、表单不触发 iOS 自动缩放 */
@media (max-width: 991.98px) {
    .navbar-nav .nav-link {
        min-height: 44px;
        display: flex;
        align-items: center;
    }
    .nav-link-business::after {
        left: 0;
        right: auto;
        width: 24px;
    }
}
@media (max-width: 767.98px) {
    .hero-zouic-title {
        font-size: clamp(1.7rem, 6.5vw, 2.35rem);
    }
    .hero-zouic-subtitle,
    .section-zouic-subtitle {
        font-size: 1rem;
    }
    .hero-secondary-cta {
        display: flex;
        flex-direction: column;
        gap: .75rem;
    }
    .hero-cta-btn,
    .hero-business-lead,
    .btn-zouic {
        width: 100%;
        justify-content: center;
        min-height: 44px;
    }
    /* iOS Safari 输入框字号 <16px 会放大页面 */
    .zlead-form input,
    .zlead-form textarea,
    .input-zouic,
    .form-select,
    .form-control {
        font-size: 16px;
    }
    .hero-source-line {
        gap: .35rem;
        font-size: .8rem;
    }
}