/* ========================================
   Shotcut 中文网站 - 主样式表
   Premium Design with Light/Dark Theme
   ======================================== */

/* ---- CSS Variables ---- */
:root {
    /* Colors - Light */
    --bg-primary: #ffffff;
    --bg-secondary: #f8faf9;
    --bg-tertiary: #f0f5f2;
    --bg-card: #ffffff;
    --bg-card-hover: #f8faf9;
    --bg-code: #f0f5f2;
    --bg-nav: rgba(255, 255, 255, 0.85);

    --text-primary: #0f1a14;
    --text-secondary: #4a5e52;
    --text-tertiary: #7a8f82;
    --text-inverse: #ffffff;

    --border-primary: #e2eae6;
    --border-secondary: #d0ddd6;

    --accent: #00C853;
    --accent-dark: #00A844;
    --accent-light: #e8f9ef;
    --accent2: #00BFA5;
    --accent3: #6C63FF;

    --shadow-sm: 0 1px 3px rgba(0, 40, 20, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 40, 20, 0.08);
    --shadow-lg: 0 12px 40px rgba(0, 40, 20, 0.1);
    --shadow-xl: 0 24px 64px rgba(0, 40, 20, 0.12);

    --gradient-primary: linear-gradient(135deg, #00C853, #00BFA5);
    --gradient-text: linear-gradient(135deg, #00C853, #00BFA5);
    --gradient-bg: linear-gradient(180deg, #f0f9f4 0%, #ffffff 100%);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --font-sans: 'Noto Sans SC', 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Space Grotesk', 'Noto Sans SC', sans-serif;

    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-spring: 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

[data-theme="dark"] {
    --bg-primary: #0a0f0c;
    --bg-secondary: #111a14;
    --bg-tertiary: #162019;
    --bg-card: #141e17;
    --bg-card-hover: #1a2820;
    --bg-code: #1a2820;
    --bg-nav: rgba(10, 15, 12, 0.9);

    --text-primary: #e8f0ec;
    --text-secondary: #a0b5a8;
    --text-tertiary: #6a8072;
    --text-inverse: #0a0f0c;

    --border-primary: #1e3028;
    --border-secondary: #2a4035;

    --accent: #00E676;
    --accent-dark: #00C853;
    --accent-light: #0a2a16;
    --accent2: #1DE9B6;
    --accent3: #9C8FFF;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 24px 64px rgba(0, 0, 0, 0.5);

    --gradient-primary: linear-gradient(135deg, #00E676, #1DE9B6);
    --gradient-bg: linear-gradient(180deg, #0a1a10 0%, #0a0f0c 100%);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background: var(--bg-primary);
    line-height: 1.7;
    transition: background var(--transition-base), color var(--transition-base);
    overflow-x: hidden;
    padding-top: 64px;
}

/* Hero section has its own padding, compensate body padding */
.hero {
    margin-top: -64px;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.938rem;
    transition: all var(--transition-base);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}
.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,0.1);
    opacity: 0;
    transition: opacity var(--transition-fast);
}
.btn:hover::after { opacity: 1; }

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 2px 12px rgba(0, 200, 83, 0.3);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 200, 83, 0.4);
}

.btn-outline {
    border: 1.5px solid var(--border-secondary);
    color: var(--text-primary);
    background: transparent;
}
.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
}

.btn-white {
    background: white;
    color: #0a0f0c;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
}
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.2); }


.btn-lg { padding: 14px 32px; font-size: 1rem; border-radius: var(--radius-lg); }
.btn-sm { padding: 8px 16px; font-size: 0.813rem; }


/* ---- Navbar ---- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--bg-nav);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid transparent;
    transition: all var(--transition-base);
}
.navbar.scrolled {
    border-bottom-color: var(--border-primary);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.25rem;
    font-family: var(--font-display);
}
.logo-icon { width: 32px; height: 32px; }
.logo-text { color: var(--text-primary); }
.logo-badge {
    font-size: 0.813rem;
    font-weight: 600;
    padding: 3px 10px;
    background: var(--accent-light);
    color: var(--accent);
    border-radius: 20px;
    letter-spacing: 0.5px;
}

.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
    position: relative;
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    border-radius: 1px;
    transition: width var(--transition-base);
}
.nav-link:hover { color: var(--text-primary); }
.nav-link:hover::after { width: 100%; }


.nav-actions { display: flex; align-items: center; gap: 12px; }

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    background: var(--bg-tertiary);
}
.theme-toggle:hover { background: var(--border-secondary); transform: rotate(15deg); }

.theme-icon { width: 18px; height: 18px; color: var(--text-secondary); }
.theme-icon.sun { display: none; }
.theme-icon.moon { display: block; }

[data-theme="dark"] .theme-icon.sun { display: block; }
[data-theme="dark"] .theme-icon.moon { display: none; }

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 28px;
    padding: 4px 0;
}
.mobile-menu-btn span {
    display: block;
    height: 2px;
    background: var(--text-primary);
    border-radius: 1px;
    transition: all var(--transition-base);
}

/* ---- Hero ---- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 120px 24px 60px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}
.hero-gradient {
    position: absolute;
    inset: 0;
    background: var(--gradient-bg);
}


.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    margin-bottom: 48px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: var(--accent-light);
    border: 1px solid rgba(0, 200, 83, 0.2);
    border-radius: 100px;
    font-size: 0.813rem;
    font-weight: 500;
    color: var(--accent);
    margin-bottom: 24px;
    animation: fade-up 0.6s ease-out;
}
.badge-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
    animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.5); }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
    animation: fade-up 0.6s ease-out 0.1s both;
}
.title-line { display: block; }
.title-accent {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 36px;
    animation: fade-up 0.6s ease-out 0.2s both;
}
.hero-desc strong { color: var(--text-primary); font-weight: 600; }

.hero-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 56px;
    animation: fade-up 0.6s ease-out 0.3s both;
}


@keyframes fade-up {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}


/* ---- Trust Section ---- */
.trust-section {
    padding: 32px 0;
    border-bottom: 1px solid var(--border-primary);
}
.trust-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}
.trust-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}
.trust-item svg { color: var(--accent); flex-shrink: 0; }

/* ---- Section Header ---- */
.section-header {
    text-align: center;
    margin-bottom: 56px;
}
.section-tag {
    display: inline-block;
    font-size: 0.813rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 12px;
}
.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}
.text-gradient {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section-desc {
    font-size: 1.063rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
}


.download-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 32px;
}

.download-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-base);
    padding: 36px 28px 28px;
    text-align: center;
    display: flex;
    flex-direction: column;
}
.download-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

/* Clean download card design */
.download-card-icon {
    width: 52px;
    height: 52px;
    margin: 0 auto 14px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    color: white;
    background: var(--gradient-primary);
}

.download-card h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.download-card-req {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    margin-bottom: 20px;
}

.download-card-links {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 14px;
    flex-wrap: wrap;
}

.download-card-links a {
    font-size: 0.813rem;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.download-card-links a:hover {
    color: var(--accent);
}


/* ---- Tutorial Section ---- */
.tutorial-section {
    padding: 100px 0;
    background: var(--gradient-bg);
}

.tutorial-steps {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: relative;
    max-width: 720px;
    margin: 0 auto;
}
.tutorial-steps::before {
    content: '';
    position: absolute;
    left: 32px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-primary);
}


.step-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--accent);
    transition: all var(--transition-fast);
}
.step-link:hover {
    gap: 10px;
}


/* ---- CTA Section ---- */
.cta-section {
    padding: 60px 0 100px;
}


/* ---- Footer ---- */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
    padding: 64px 0 32px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-desc {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    line-height: 1.8;
    margin-top: 16px;
}


.footer-links-col h4 {
    font-size: 0.875rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}
.footer-links-col a {
    display: block;
    font-size: 0.813rem;
    color: var(--text-tertiary);
    padding: 4px 0;
    transition: color var(--transition-fast);
}
.footer-links-col a:hover { color: var(--accent); }

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid var(--border-primary);
    text-align: center;
}
.footer-bottom p {
    font-size: 0.813rem;
    color: var(--text-tertiary);
}

/* ---- Responsive ---- */
@media (max-width: 1024px) {
    .download-cards { grid-template-columns: 1fr; max-width: 480px; margin-left: auto; margin-right: auto; }
        .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .mobile-menu-btn { display: flex; }

    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border-primary);
        padding: 16px 24px;
        gap: 16px;
        box-shadow: var(--shadow-md);
    }

    .hero { padding: 100px 24px 40px; min-height: auto; }
    .hero-cta { flex-direction: column; }


    .cta-buttons { flex-direction: column; }
    .tutorial-steps::before { left: 24px; }

    .footer-grid { grid-template-columns: 1fr; gap: 32px; }

    .trust-bar { gap: 20px; }
    .trust-item { font-size: 0.813rem; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 2rem; }
    .hero-desc { font-size: 1rem; }
}

/* ---- Tutorial Header ---- */
.tutorial-header {
    padding: 40px 0 32px;
    background: linear-gradient(135deg, rgba(0, 200, 83, 0.06) 0%, rgba(0, 191, 165, 0.03) 100%);
    border-bottom: 1px solid var(--border-primary);
}

.tutorial-header h1 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 6px;
    letter-spacing: -0.01em;
}

.tutorial-header .lead {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 600px;
}

/* ---- Info Box Colors ---- */
.info-blue {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    color: #3b82f6;
}
.info-green {
    background: rgba(0, 200, 83, 0.08);
    border: 1px solid rgba(0, 200, 83, 0.15);
    color: var(--accent);
}

/* ---- Tutorial Nav (prev/next) ---- */
.tutorial-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.nav-prev, .nav-next { display: flex; align-items: center; gap: 8px; }
.nav-next { justify-content: flex-end; text-align: right; }
.nav-prev:hover, .nav-next:hover { color: var(--accent); }
.next-text, .prev-text { font-size: 0.875rem; color: var(--text-secondary); }

/* ---- Step Cards ---- */
.step {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: 24px;
}

/* ---- Filter Cards Grid ---- */
.filter-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }

@media (max-width: 768px) {
    .tutorial-nav { grid-template-columns: 1fr; gap: 12px; }
    .filter-cards { grid-template-columns: 1fr; }
}

/* ---- Animations ---- */
[data-aos] {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
[data-aos].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

/* Smooth theme transitions */
*, *::before, *::after {
    transition-property: background-color, border-color, color, fill, stroke;
    transition-duration: 0s;
    transition-timing-function: ease;
}

html.theme-transitioning *,
html.theme-transitioning *::before,
html.theme-transitioning *::after {
    transition-duration: 0.3s !important;
}

/* Scroll progress */
.scroll-progress {
    position: fixed;
    top: 64px;
    left: 0;
    height: 2px;
    background: var(--gradient-primary);
    z-index: 1001;
    transition: width 0.1s linear;
}

/* ---- Tutorial Pages ---- */
.tutorial-main {
    min-height: 100vh;
    padding-bottom: 60px;
    background: var(--bg-secondary);
}

/* Two-column layout only when sidebar present */
.tutorial-main:has(.tutorial-sidebar) {
    display: grid;
    grid-template-columns: 240px 1fr;
    padding-top: 0;
    padding-bottom: 0;
}

.tutorial-sidebar {
    position: sticky;
    top: 64px;
    height: calc(100vh - 64px);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-primary);
    padding: 32px 16px;
    overflow-y: auto;
}

.tutorial-sidebar h3 {
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
    padding: 0 12px;
}

.sidebar-nav {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sidebar-nav a {
    display: block;
    padding: 10px 12px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.sidebar-nav a:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.sidebar-nav a.active {
    background: var(--accent-light);
    color: var(--accent);
    font-weight: 600;
}

.tutorial-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Two-column layout content */
.tutorial-main:has(.tutorial-sidebar) .tutorial-content {
    max-width: none;
    margin: 0;
    padding: 48px 64px;
}

.content-header {
    margin-bottom: 48px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border-primary);
}

.content-header .tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.content-header h1 {
    font-family: var(--font-display);
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.content-header .lead {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.tutorial-content section {
    margin-bottom: 40px;
}

.tutorial-content h2 {
    font-family: var(--font-display);
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--accent-light);
    display: inline-block;
}

.tutorial-content p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.tutorial-content ul, .tutorial-content ol {
    margin-bottom: 16px;
    padding-left: 24px;
}

.tutorial-content li {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 8px;
}


.feature-list {
    list-style: none;
    padding: 0 !important;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.feature-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    padding-left: 16px !important;
}

.feature-list svg {
    color: var(--accent);
    flex-shrink: 0;
    margin-top: 4px;
}


.comparison-table {
    overflow-x: auto;
    margin: 20px 0;
}

.step-links {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-top: 24px;
}

.step-link {
    display: inline-flex;
    align-items: center;
    padding: 10px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.step-link:hover {
    background: var(--accent-light);
    border-color: var(--accent);
    color: var(--accent);
}


.tip-card {
    padding: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.tip-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-sm);
}

.tip-card h4 {
    font-size: 0.938rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.tip-card p {
    font-size: 0.813rem;
    color: var(--text-tertiary);
    margin: 0;
    line-height: 1.6;
}

.code-block {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    margin: 16px 0;
    overflow-x: auto;
}

.code-block code {
    font-family: 'Space Grotesk', monospace;
    font-size: 0.875rem;
    color: var(--text-primary);
}


@media (max-width: 1024px) {
    .tutorial-main:has(.tutorial-sidebar) {
        grid-template-columns: 200px 1fr;
    }
    .tutorial-main:has(.tutorial-sidebar) .tutorial-content {
        padding: 32px 40px;
    }
}

@media (max-width: 768px) {
    .tutorial-main:has(.tutorial-sidebar) {
        grid-template-columns: 1fr;
    }
    .tutorial-sidebar {
        position: relative;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border-primary);
        padding: 16px;
    }
    .sidebar-nav {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 8px;
    }
    .sidebar-nav a {
        padding: 6px 12px;
        font-size: 0.813rem;
    }
    .tutorial-content {
        padding: 24px 20px;
    }
    .content-header h1 {
        font-size: 1.75rem;
    }
}

/* ---- Page Layout ---- */
.page-main {
    min-height: 100vh;
    padding-top: 72px;
    background: var(--gradient-bg);
}

.page-header {
    padding: 48px 0 32px;
    background: linear-gradient(135deg, rgba(0, 200, 83, 0.08) 0%, rgba(0, 191, 165, 0.05) 100%);
    border-bottom: 1px solid var(--border-primary);
}

.page-header h1 {
    font-family: var(--font-display);
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.page-desc {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
}

.page-content {
    padding: 48px 0;
}

.tutorial-article {
    max-width: 800px;
}

.tutorial-article section {
    margin-bottom: 40px;
}

.tutorial-article h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--accent-light);
}

.tutorial-article h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 24px;
    margin-bottom: 12px;
}

.tutorial-article p {
    font-size: 0.938rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.tutorial-article ul, 
.tutorial-article ol {
    margin-bottom: 16px;
    padding-left: 24px;
}

.tutorial-article li {
    font-size: 0.938rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 8px;
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    margin-bottom: 12px;
}

.breadcrumb a {
    color: var(--text-tertiary);
    transition: color var(--transition-fast);
}

.breadcrumb a:hover {
    color: var(--accent);
}

.breadcrumb span {
    color: var(--text-tertiary);
}


/* Data Table */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.data-table th,
.data-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-primary);
}

.data-table th {
    font-size: 0.813rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: var(--bg-tertiary);
}

.data-table td {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

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

/* Code Block */
.code-block {
    background: var(--bg-code);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    margin: 16px 0;
    overflow-x: auto;
    font-family: var(--font-display);
    font-size: 0.813rem;
    color: var(--text-primary);
    white-space: pre-wrap;
}


.faq-item {
    padding: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
}

.faq-item h4 {
    font-size: 0.938rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.faq-item p {
    font-size: 0.813rem;
    color: var(--text-tertiary);
    margin-bottom: 0;
    line-height: 1.7;
}


.toc {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: 20px;
}

.toc h4 {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-primary);
}

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

.toc li {
    margin-bottom: 8px;
}

.toc a {
    display: block;
    padding: 6px 0;
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.toc a:hover {
    color: var(--accent);
}


@media (max-width: 768px) {
    .page-header {
        padding: 32px 0 24px;
    }
    .page-header h1 {
        font-size: 1.75rem;
    }
    .page-desc {
        font-size: 1rem;
    }
    .page-content {
        padding: 32px 0;
    }
    .tutorial-article h2 {
        font-size: 1.25rem;
    }
}

/* ========================================
   Download Modal - 下载弹窗
   ======================================== */

.download-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.35s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.35s;
}

.download-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.download-modal {
    position: relative;
    width: 100%;
    max-width: 580px;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl, 24px);
    box-shadow: 0 40px 80px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(255, 255, 255, 0.05) inset;
    padding: 36px;
    transform: translateY(24px) scale(0.96);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    overflow: hidden;
}

.download-modal-overlay.active .download-modal {
    transform: translateY(0) scale(1);
}

/* 弹窗背景光晕 */
.download-modal::before {
    content: '';
    position: absolute;
    top: -100px;
    right: -100px;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, var(--accent-light) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.6;
}

/* 关闭按钮 */
.modal-close-btn {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: 50%;
    color: var(--text-tertiary);
    cursor: pointer;
    z-index: 2;
    transition: all var(--transition-fast);
}

.modal-close-btn:hover {
    background: var(--bg-code);
    color: var(--text-primary);
    border-color: var(--border-secondary);
    transform: rotate(90deg);
}

/* 弹窗头部 */
.modal-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 28px;
    position: relative;
    z-index: 1;
}

.modal-platform-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 28px;
    color: white;
}

.modal-platform-icon.windows {
    background: linear-gradient(135deg, #0078d4, #00bcf2);
}

.modal-platform-icon.macos {
    background: linear-gradient(135deg, #555, #999);
}

.modal-platform-icon.linux {
    background: linear-gradient(135deg, #f5a623, #f76b1c);
}

.modal-header-text { flex: 1; }


.modal-header-text h2 {
    font-family: var(--font-display);
    font-size: 1.375rem;
    font-weight: 800;
    color: var(--text-primary);
    margin: 0 0 2px;
    letter-spacing: -0.01em;
}

.modal-header-text p {
    font-size: 0.813rem;
    color: var(--text-tertiary);
    margin: 0;
}

/* 弹窗主体 */
.modal-body {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    z-index: 1;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-primary);
}

.modal-qr-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.qr-container {
    text-align: center;
}

.qr-container canvas {
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    background: white;
    padding: 8px;
    display: block;
}

.qr-hint {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-top: 10px;
    font-size: 0.688rem;
    color: var(--text-tertiary);
}

.qr-hint svg {
    flex-shrink: 0;
    color: var(--accent);
}

/* 弹窗下载链接按钮 */
.modal-links {
    width: 100%;
    padding-top: 16px;
    border-top: 1px solid var(--border-primary);
    text-align: center;
}
.modal-download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 14px 24px;
    background: var(--gradient-primary);
    color: #fff;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 700;
    text-decoration: none;
    letter-spacing: 2px;
    transition: all var(--transition-base);
    box-shadow: 0 4px 16px rgba(0, 200, 83, 0.3);
}
.modal-download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(0, 200, 83, 0.4);
}

/* 弹窗底部 */


/* 弹窗响应式 */
@media (max-width: 640px) {
    .download-modal {
        padding: 24px 20px;
        border-radius: var(--radius-lg);
    }

    .qr-container canvas {
        width: 140px;
        height: 140px;
    }

    .modal-platform-icon {
        width: 44px;
        height: 44px;
        font-size: 22px;
        border-radius: 12px;
    }

    .modal-header-text h2 {
        font-size: 1.125rem;
    }

    }

/* ========================================
   首页优化 — 简洁布局
   ======================================== */

/* ---- Hero Simple ---- */
.hero-simple {
    padding: 80px 24px 64px;
    text-align: center;
    background: var(--gradient-bg);
}
.hero-simple .hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: var(--accent-light);
    border: 1px solid rgba(0, 200, 83, 0.2);
    border-radius: 20px;
    font-size: 0.813rem;
    color: var(--accent-dark);
    font-weight: 500;
    margin-bottom: 24px;
}
.hero-simple .badge-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--accent);
    animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}
.hero-simple .hero-title {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-primary);
    margin: 0 auto 16px;
    max-width: 700px;
    letter-spacing: -0.02em;
    line-height: 1.2;
}
.hero-simple .hero-desc {
    font-size: 1.063rem;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto 32px;
    line-height: 1.8;
}
.hero-simple .hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ---- Trust Strip ---- */
.trust-strip {
    padding: 0 24px;
    border-bottom: 1px solid var(--border-primary);
}
.trust-items {
    display: flex;
    justify-content: center;
    gap: 32px;
    padding: 20px 0;
    flex-wrap: wrap;
}
.trust-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}
.trust-icon { font-size: 1.125rem; }

/* ---- Why Section ---- */
.why-section {
    padding: 80px 24px;
    text-align: center;
}
.why-section .section-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 8px;
}
.why-section .section-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
}
.why-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}
.why-card {
    padding: 32px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-base);
}
.why-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.why-card-highlight {
    border-color: var(--accent);
    background: var(--accent-light);
}
.why-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 16px;
}
.why-card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}
.why-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

/* ---- Steps Section ---- */
.steps-section {
    padding: 80px 24px;
    background: var(--bg-secondary);
    text-align: center;
}
.steps-section .section-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 8px;
}
.steps-section .section-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
}
.steps-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    max-width: 900px;
    margin: 0 auto;
    flex-wrap: wrap;
}
.step-card-home {
    flex: 1;
    min-width: 220px;
    max-width: 260px;
    padding: 28px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-base);
}
.step-card-home:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: #fff;
    font-size: 1.125rem;
    font-weight: 800;
    margin-bottom: 16px;
}
.step-card-home h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}
.step-card-home p {
    font-size: 0.813rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 12px;
}
.step-link {
    display: inline-block;
    font-size: 0.813rem;
    color: var(--accent);
    font-weight: 600;
    text-decoration: none;
}
.step-link:hover { text-decoration: underline; }
.step-arrow {
    font-size: 1.5rem;
    color: var(--accent);
    font-weight: 700;
    margin: 0 8px;
    flex-shrink: 0;
}

/* ---- CTA Banner Section ---- */
.cta-banner {
    margin: 48px 0 24px;
    padding: 28px 36px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}
.cta-banner-text { color: #fff; }
.cta-banner-text strong { display: block; font-size: 1.125rem; margin-bottom: 4px; }
.cta-banner-text span { font-size: 0.875rem; opacity: 0.9; }
.cta-banner .btn {
    white-space: nowrap; font-size: 1rem; padding: 14px 32px;
    background: #fff; color: var(--accent-dark);
    border-radius: var(--radius-md); font-weight: 700;
    text-decoration: none; transition: all var(--transition-base);
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}
.cta-banner .btn:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(0,0,0,0.25); }
.cta-banner-section { padding: 64px 24px; }

/* ---- 首页响应式 ---- */
@media (max-width: 768px) {
    .hero-simple .hero-title { font-size: 2rem; }
    .why-grid { grid-template-columns: 1fr; max-width: 400px; }
    .steps-row { flex-direction: column; gap: 16px; }
    .step-card-home { max-width: 100%; }
    .step-arrow { transform: rotate(90deg); margin: 0; }
    .trust-items { gap: 16px; }
    .cta-banner { flex-direction: column; text-align: center; padding: 24px 20px; }
    .cta-banner .btn { width: 100%; text-align: center; }
}
@media (max-width: 480px) {
    .hero-simple .hero-title { font-size: 1.75rem; }
    .hero-simple { padding: 60px 16px 40px; }
    .why-section, .steps-section { padding: 48px 16px; }
    .cta-banner-section { padding: 40px 16px; }
}

/* ---- Features Page ---- */
.feature-stat-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 32px;
}
.feature-stat-card {
    text-align: center;
    padding: 28px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    transition: transform 0.2s;
}
.feature-stat-card:hover { transform: translateY(-2px); border-color: var(--accent); }
.feature-stat-icon { font-size: 2rem; margin-bottom: 10px; }
.feature-stat-card h3 { font-size: 1.1rem; margin-bottom: 6px; color: var(--text-primary); }
.feature-stat-card p { font-size: 0.8rem; color: var(--text-tertiary); margin: 0; }

.feature-highlight-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 32px;
}
.feature-highlight-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    transition: all var(--transition-base);
}
.feature-highlight-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.feature-highlight-card h3 { font-size: 1.1rem; margin: 0 0 12px; color: var(--accent); }
.feature-highlight-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; margin: 0; }

.community-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 32px;
}
.community-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: all var(--transition-base);
}
.community-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.community-card h3 { font-size: 1.25rem; margin-bottom: 8px; color: var(--text-primary); }
.community-card p { color: var(--text-secondary); font-size: 0.875rem; line-height: 1.7; margin-bottom: 16px; }

@media (max-width: 768px) {
    .feature-stat-grid { grid-template-columns: repeat(2, 1fr); }
    .feature-highlight-grid { grid-template-columns: 1fr; }
    .community-grid { grid-template-columns: 1fr; }
}