/* ===== CSS Variables ===== */
:root {
    /* Ink wash palette */
    --ink-black: #1a1a2e;
    --ink-dark: #0f0f1a;
    --ink-deep: #16213e;
    --ink-medium: #1e3a5f;
    --ink-light: #2d5f8a;

    /* Accent colors - inspired by Chinese traditional colors */
    --cinnabar: #c74b50;      /* 朱砂红 */
    --jade: #5a8a6a;          /* 玉绿 */
    --amber: #d4a853;         /* 琥珀 */
    --indigo: #4a6fa5;        /* 靛蓝 */
    --paper: #f5f0e8;         /* 宣纸色 */

    /* Neutral */
    --text-primary: #e8e4dc;
    --text-secondary: #a09888;
    --text-muted: #6b6358;
    --border: rgba(212, 168, 83, 0.15);
    --glass: rgba(30, 58, 95, 0.4);

    /* Spacing */
    --section-padding: clamp(4rem, 8vw, 8rem);
    --container-max: 1200px;

    /* Typography */
    --font-serif: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
    --font-calligraphy: 'Ma Shan Zheng', 'STKaiti', 'KaiTi', cursive;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
}

/* ===== Reset ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-serif);
    background: var(--ink-dark);
    color: var(--text-primary);
    line-height: 1.8;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ===== Skip Link ===== */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.5rem 1rem;
    background: var(--cinnabar);
    color: white;
    border-radius: 0 0 4px 4px;
    z-index: 1000;
    transition: top 0.2s;
}

.skip-link:focus {
    top: 0;
}

/* ===== Container ===== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 clamp(1.5rem, 4vw, 3rem);
}

/* ===== Navigation ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1rem 0;
    transition: all 0.3s ease;
    background: transparent;
}

.nav.scrolled {
    background: rgba(15, 15, 26, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 0;
}

.nav-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 clamp(1.5rem, 4vw, 3rem);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-char {
    font-family: var(--font-calligraphy);
    font-size: 2rem;
    color: var(--cinnabar);
    line-height: 1;
}

.logo-text {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.05em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s;
    position: relative;
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--cinnabar);
    transition: width 0.3s;
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-github {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lang-toggle {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.4rem 0.8rem;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s;
}

.lang-toggle:hover {
    background: rgba(212, 168, 83, 0.1);
    color: var(--text-primary);
}

.lang-zh,
.lang-en {
    transition: opacity 0.2s;
}

html[lang="zh-CN"] .lang-en {
    opacity: 0.5;
}

html[lang="en"] .lang-zh {
    opacity: 0.5;
}

.nav-mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 0.5rem;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s;
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(135deg, var(--ink-dark) 0%, var(--ink-deep) 50%, var(--ink-medium) 100%);
}

.hero-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.6;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    padding: 2rem;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.2rem;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.85rem;
    color: var(--amber);
    margin-bottom: 2rem;
    backdrop-filter: blur(10px);
}

.badge-icon {
    font-size: 0.75rem;
}

.hero-title {
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.title-calligraphy {
    display: block;
    font-family: var(--font-calligraphy);
    font-size: clamp(4rem, 10vw, 8rem);
    color: var(--text-primary);
    text-shadow: 0 0 60px rgba(199, 75, 80, 0.3);
    letter-spacing: 0.1em;
}

.title-sub {
    display: block;
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    font-weight: 400;
    color: var(--text-secondary);
    letter-spacing: 0.3em;
    margin-top: 0.5rem;
}

.hero-desc {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 3rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-family: var(--font-serif);
}

.btn-primary {
    background: var(--cinnabar);
    color: white;
    box-shadow: 0 4px 20px rgba(199, 75, 80, 0.4);
}

.btn-primary:hover {
    background: #d65a60;
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(199, 75, 80, 0.5);
}

.btn-secondary {
    background: var(--glass);
    color: var(--text-primary);
    border: 1px solid var(--border);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(212, 168, 83, 0.1);
    border-color: var(--amber);
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    padding: 1.5rem 2rem;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 16px;
    backdrop-filter: blur(10px);
}

.stat {
    text-align: center;
}

.stat-num {
    display: block;
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--amber);
}

.stat-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border);
}

.hero-devices {
    position: absolute;
    right: 5%;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1;
}

.device-showcase {
    position: relative;
    width: 280px;
    height: 350px;
}

.device-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0;
    transform: scale(0.9);
    transition: all 0.5s ease;
}

.device-img.active {
    opacity: 1;
    transform: scale(1);
}

.device-nav {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.device-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--text-muted);
    border: none;
    cursor: pointer;
    transition: all 0.3s;
    padding: 0;
}

.device-dot.active {
    background: var(--cinnabar);
    transform: scale(1.2);
}

.hero-scroll-hint {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.85rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-10px); }
}

/* ===== Sections ===== */
.section {
    padding: var(--section-padding) 0;
    position: relative;
}

.section-title {
    font-family: var(--font-calligraphy);
    font-size: clamp(2.5rem, 5vw, 4rem);
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 1rem;
    letter-spacing: 0.1em;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

/* ===== About Section ===== */
.about {
    background: linear-gradient(180deg, var(--ink-dark) 0%, var(--ink-deep) 100%);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text {
    max-width: 500px;
}

.about-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 2;
}

.about-flow {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.flow-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.flow-icon {
    font-size: 2rem;
}

.flow-arrow {
    color: var(--amber);
    font-size: 1.5rem;
}

.about-visual {
    display: flex;
    justify-content: center;
}

.ink-frame {
    position: relative;
    padding: 2rem;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 8px;
    backdrop-filter: blur(10px);
}

.ink-frame::before {
    content: '';
    position: absolute;
    top: -8px;
    left: -8px;
    right: -8px;
    bottom: -8px;
    border: 1px solid var(--amber);
    border-radius: 12px;
    opacity: 0.3;
    pointer-events: none;
}

.about-img {
    width: 100%;
    max-width: 300px;
    height: auto;
    display: block;
}

/* ===== Models Section ===== */
.models {
    background: var(--ink-dark);
}

.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
}

.model-card {
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.model-card:hover {
    transform: translateY(-8px);
    border-color: var(--amber);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.model-img-wrap {
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(26, 26, 46, 0.8), rgba(30, 58, 95, 0.8));
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
}

.model-img {
    width: 100%;
    max-width: 180px;
    height: auto;
    object-fit: contain;
    transition: transform 0.3s;
}

.model-card:hover .model-img {
    transform: scale(1.05);
}

.model-info {
    padding: 1.5rem;
    text-align: center;
}

.model-name {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.model-status {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
    font-size: 0.8rem;
    margin-bottom: 0.75rem;
}

.model-status.working {
    background: rgba(90, 138, 106, 0.2);
    color: var(--jade);
    border: 1px solid rgba(90, 138, 106, 0.3);
}

.model-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== Features Section ===== */
.features {
    background: linear-gradient(180deg, var(--ink-dark) 0%, var(--ink-deep) 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    padding: 2rem;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 16px;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--cinnabar);
    box-shadow: 0 10px 40px rgba(199, 75, 80, 0.1);
}

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(199, 75, 80, 0.1);
    border-radius: 12px;
    color: var(--cinnabar);
    margin-bottom: 1.25rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== Architecture Section ===== */
.architecture {
    background: var(--ink-dark);
}

.arch-diagram {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

.arch-layer {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1rem;
}

.arch-box {
    padding: 1.5rem 2.5rem;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 12px;
    text-align: center;
    min-width: 200px;
    backdrop-filter: blur(10px);
}

.arch-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--amber);
    margin-bottom: 0.25rem;
}

.arch-desc {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.arch-connector {
    display: flex;
    justify-content: center;
    color: var(--text-muted);
    margin: 0.5rem 0;
}

.arch-layer-bottom {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}

.arch-component {
    padding: 1rem 1.5rem;
    background: rgba(90, 138, 106, 0.1);
    border: 1px solid rgba(90, 138, 106, 0.2);
    border-radius: 8px;
    text-align: center;
    min-width: 100px;
}

.arch-component span:first-child {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--jade);
}

.arch-comp-desc {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* ===== Quick Start Section ===== */
.quickstart {
    background: linear-gradient(180deg, var(--ink-dark) 0%, var(--ink-deep) 100%);
}

.qs-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
}

.qs-card {
    padding: 2rem;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 16px;
    text-align: center;
    backdrop-filter: blur(10px);
}

.qs-step {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    background: var(--cinnabar);
    color: white;
    border-radius: 50%;
    font-size: 1.25rem;
    font-weight: 700;
}

.qs-card h3 {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.qs-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.qs-code {
    background: var(--ink-dark);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    text-align: left;
}

.qs-code code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--jade);
    line-height: 1.6;
}

.qs-firmware-table {
    max-width: 700px;
    margin: 0 auto;
}

.qs-firmware-table h3 {
    text-align: center;
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.table-wrap {
    overflow-x: auto;
    border-radius: 12px;
    border: 1px solid var(--border);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--glass);
    backdrop-filter: blur(10px);
}

th, td {
    padding: 1rem 1.5rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    background: rgba(199, 75, 80, 0.1);
    color: var(--text-primary);
    font-weight: 600;
}

td {
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background: rgba(212, 168, 83, 0.05);
}

/* ===== Build Section ===== */
.build {
    background: var(--ink-dark);
}

.build-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.build-card {
    padding: 2rem;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 16px;
    backdrop-filter: blur(10px);
}

.build-card h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    text-align: center;
}

.build-code {
    background: var(--ink-dark);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    overflow-x: auto;
}

.build-code pre {
    margin: 0;
}

.build-code code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--jade);
    line-height: 1.8;
}

.build-note {
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--text-muted);
    text-align: center;
}

/* ===== Links Section ===== */
.links {
    background: linear-gradient(180deg, var(--ink-dark) 0%, var(--ink-deep) 100%);
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1.5rem;
    max-width: 800px;
    margin: 0 auto;
}

.link-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: 1.5rem;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.link-card:hover {
    color: var(--text-primary);
    border-color: var(--amber);
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.link-card svg {
    color: var(--amber);
}

.link-card span {
    font-size: 0.95rem;
}

/* ===== Footer ===== */
.footer {
    padding: 3rem 0;
    background: var(--ink-black);
    border-top: 1px solid var(--border);
}

.footer-content {
    text-align: center;
}

.footer-text {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.footer-logo {
    font-family: var(--font-calligraphy);
    font-size: 1.5rem;
    color: var(--cinnabar);
}

.footer-license {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ===== Animations ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .hero-devices {
        display: none;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .about-visual {
        order: -1;
    }

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        padding: 1rem;
        background: rgba(15, 15, 26, 0.95);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--border);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links a {
        padding: 0.75rem 0;
        border-bottom: 1px solid var(--border);
    }

    .nav-links a:last-child {
        border-bottom: none;
    }

    .nav-mobile-toggle {
        display: flex;
    }

    .hero-stats {
        flex-wrap: wrap;
        gap: 1.5rem;
    }

    .stat-divider {
        display: none;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

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

    .models-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .links-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .models-grid {
        grid-template-columns: 1fr;
    }

    .about-flow {
        justify-content: center;
    }

    .flow-arrow {
        display: none;
    }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--ink-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--ink-medium);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--ink-light);
}

/* ===== Selection ===== */
::selection {
    background: rgba(199, 75, 80, 0.3);
    color: var(--text-primary);
}