:root {
    --device-pixel-ratio: 1;

    --color-primary: #FF6B35;
    --color-primary-light: #FF8F65;
    --color-primary-dark: #E55A2B;
    --color-secondary: #6366F1;
    --color-secondary-light: #818CF8;
    --color-accent-pink: #EC4899;
    --color-accent-green: #10B981;
    --color-accent-yellow: #F59E0B;
    --color-accent-cyan: #06B6D4;

    --color-bg: #FFFFFF;
    --color-bg-secondary: #F9FAFB;
    --color-bg-tertiary: #F3F4F6;
    --color-text: #111827;
    --color-text-secondary: #6B7280;
    --color-text-muted: #9CA3AF;
    --color-border: #E5E7EB;
    --color-border-light: #F3F4F6;

    --radius-xs: 6px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
    --shadow-lg: 0 16px 40px rgba(0,0,0,0.10);
    --shadow-xl: 0 24px 48px rgba(0,0,0,0.12);
    --shadow-glow: 0 0 40px rgba(99,102,241,0.15);

    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

    --font-display: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    --nav-height: 72px;
    --container-max: 1160px;
}

[data-theme="dark"] {
    --color-bg: #0F1117;
    --color-bg-secondary: #1A1D27;
    --color-bg-tertiary: #252836;
    --color-text: #F0F0F5;
    --color-text-secondary: #9A9AAF;
    --color-text-muted: #6B6E82;
    --color-border: #2A2D3A;
    --color-border-light: #22252F;
    --shadow-xs: 0 1px 2px rgba(0,0,0,0.2);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.25);
    --shadow-md: 0 8px 24px rgba(0,0,0,0.3);
    --shadow-lg: 0 16px 40px rgba(0,0,0,0.35);
    --shadow-xl: 0 24px 48px rgba(0,0,0,0.4);
    --shadow-glow: 0 0 40px rgba(99,102,241,0.12);

    color-scheme: dark;
}
[data-theme="dark"] .hero { background: linear-gradient(165deg, #080910 0%, #0d0e1a 30%, #12142a 60%, #181a33 100%); }
[data-theme="dark"] .hero-glow-1 { background: rgba(99,102,241,0.10); }
[data-theme="dark"] .hero-glow-2 { background: rgba(255,107,53,0.08); }
[data-theme="dark"] .navbar.scrolled { background: rgba(15,17,23,0.92); border-color: var(--color-border); }
[data-theme="dark"] .nav-links { background: rgba(15,17,23,0.97); }
[data-theme="dark"] .feature-card { background: var(--color-bg-secondary); }
[data-theme="dark"] .arch-node { background: var(--color-bg-secondary); border-color: var(--color-border); }
[data-theme="dark"] .arch-feature-item { background: var(--color-bg-secondary); border-color: var(--color-border-light); }
[data-theme="dark"] .command-card { background: var(--color-bg-secondary); border-color: var(--color-border-light); }
[data-theme="dark"] .auth-query-box { background: var(--color-bg-secondary); border-color: var(--color-border); }
[data-theme="dark"] .auth-input-group { background: var(--color-bg-tertiary); border-color: var(--color-border); color: var(--color-text); }
[data-theme="dark"] .step-visual code { background: #161722; border-color: rgba(255,255,255,0.06); }
[data-theme="dark"] .download-card { background: var(--color-bg-secondary); border-color: var(--color-border-light); }
[data-theme="dark"] .download-action { border-color: var(--color-border-light); }
[data-theme="dark"] .stat-item { background: rgba(255,255,255,0.03); border-color: rgba(255,255,255,0.07); }
[data-theme="dark"] .stat-bar { background: rgba(255,255,255,0.06); }
[data-theme="dark"] .download-notice { background: rgba(99,102,241,0.08); border-color: rgba(99,102,241,0.15); }
[data-theme="dark"] .result-card.authorized { background: rgba(16,185,129,0.08); border-color: rgba(16,185,129,0.18); }
[data-theme="dark"] .result-card.unauthorized { background: rgba(239,68,68,0.05); border-color: rgba(239,68,68,0.15); }
[data-theme="dark"] .result-card.loading { background: rgba(99,102,241,0.07); border-color: rgba(99,102,241,0.14); }
[data-theme="dark"] .tech-tag { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.08); }
[data-theme="dark"] .feature-tags span { background: var(--color-bg-tertiary); }

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

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

body {
    font-family: var(--font-body); color: var(--color-text); background: var(--color-bg);
    line-height: 1.6; overflow-x: hidden;
}

.container { max-width: var(--container-max); margin: 0 auto; padding: 0 24px; }
a { text-decoration: none; color: inherit; transition: var(--transition-fast); }
img { max-width: 100%; display: block; }

.text-gradient {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light), var(--color-secondary), var(--color-secondary-light));
    background-size: 200% 200%;
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
    animation: gradientShift 4s ease infinite;
}
@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.reveal {
    opacity: 0; transform: translateY(32px);
    transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.34, 1.56, 0.64, 1);
    transition-delay: calc(var(--delay, 0) * 80ms);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

.cursor-blink {
    font-weight: 100; animation: blinkCursor 1s step-end infinite;
    color: var(--color-primary-light);
}
@keyframes blinkCursor { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

/* ========== NAVBAR ========== */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    height: var(--nav-height); display: flex; align-items: center;
    transition: var(--transition-base); background: transparent;
}
.navbar.scrolled {
    background: rgba(255,255,255,0.88); backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--color-border-light); box-shadow: var(--shadow-sm);
}
.nav-container {
    max-width: var(--container-max); margin: 0 auto; padding: 0 24px;
    display: flex; align-items: center; justify-content: space-between; width: 100%;
}
.nav-logo { display: flex; align-items: center; gap: 10px; font-size: 1.3rem; font-weight: 700; }
.logo-icon {
    display: inline-flex; align-items: center; justify-content: center;
    width: 36px; height: 36px; background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: #fff; border-radius: var(--radius-sm); font-size: 1rem; font-weight: 900;
}
.logo-text { letter-spacing: -0.5px; }
.nav-links { display: flex; gap: 4px; }
.nav-link {
    padding: 8px 18px; border-radius: var(--radius-full); font-size: 0.9rem;
    font-weight: 500; color: var(--color-text-secondary); transition: var(--transition-fast);
    position: relative;
}
.nav-link:hover { color: var(--color-text); background: var(--color-bg-tertiary); }
.nav-link.active {
    color: var(--color-secondary); background: rgba(99,102,241,0.08);
    font-weight: 600;
}
.nav-link.active::after {
    content: ''; position: absolute; bottom: -2px; left: 50%; transform: translateX(-50%);
    width: 18px; height: 3px; background: var(--color-secondary); border-radius: 3px;
}

.nav-toggle {
    display: none; flex-direction: column; gap: 5px;
    background: none; border: none; cursor: pointer; padding: 8px;
}
.nav-toggle span {
    display: block; width: 22px; height: 2px; background: var(--color-text);
    border-radius: 2px; transition: var(--transition-base);
}
.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

.theme-toggle {
    display: flex; align-items: center; justify-content: center;
    width: 38px; height: 38px; border-radius: var(--radius-full);
    background: var(--color-bg-tertiary); border: 1px solid var(--color-border);
    cursor: pointer; margin-left: 8px;
    transition: all var(--transition-base); position: relative;
    flex-shrink: 0; z-index: 10;
}
.theme-toggle:hover { border-color: var(--color-secondary); box-shadow: 0 2px 12px rgba(99,102,241,0.15); }
.theme-toggle svg { width: 18px; height: 18px; color: var(--color-text-secondary); transition: all var(--transition-base); }
.theme-toggle .icon-moon { position: absolute; opacity: 1; transform: rotate(0) scale(1); }
.theme-toggle .icon-sun { position: absolute; opacity: 0; transform: rotate(-90deg) scale(0.5); }

[data-theme="dark"] .theme-toggle { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.12); }
[data-theme="dark"] .theme-toggle:hover { background: rgba(255,255,255,0.14); border-color: rgba(255,255,255,0.2); }
[data-theme="dark"] .theme-toggle .icon-sun { opacity: 1; transform: rotate(0) scale(1); color: #FBBF24; }
[data-theme="dark"] .theme-toggle .icon-moon { opacity: 0; transform: rotate(90deg) scale(0.5); }

/* ========== HERO ========== */
.hero {
    position: relative; min-height: 100vh; display: flex; align-items: center;
    justify-content: center; overflow: hidden;
    background: linear-gradient(165deg, #0F0C29 0%, #1a1442 30%, #1e165a 60%, #24243e 100%);
}
#particleCanvas { position: absolute; inset: 0; z-index: 1; }

.hero-glow {
    position: absolute; border-radius: 50%; filter: blur(80px); z-index: 0;
    pointer-events: none;
}
.hero-glow-1 {
    width: 500px; height: 500px; background: rgba(99,102,241,0.15);
    top: 10%; left: -10%; animation: floatGlow 8s ease-in-out infinite;
}
.hero-glow-2 {
    width: 400px; height: 400px; background: rgba(255,107,53,0.12);
    bottom: 10%; right: -5%; animation: floatGlow 10s ease-in-out infinite reverse;
}
@keyframes floatGlow {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -20px) scale(1.05); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

.hero-content {
    position: relative; z-index: 2; text-align: center;
    padding: 120px 24px 100px; max-width: 720px;
}
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 18px; background: rgba(255,255,255,0.07);
    border: 1px solid rgba(255,255,255,0.12); border-radius: var(--radius-full);
    color: rgba(255,255,255,0.75); font-size: 0.82rem; font-weight: 500;
    backdrop-filter: blur(10px); margin-bottom: 28px; animation: fadeInDown 0.8s ease both;
}
.hero-title { margin-bottom: 22px; animation: fadeInUp 0.8s ease 0.15s both; }
.title-line {
    display: block; font-size: clamp(3rem, 8vw, 5.5rem); font-weight: 900;
    letter-spacing: -3px; line-height: 1.05; color: #fff;
}
.title-sub {
    display: block; font-size: clamp(1.2rem, 3vw, 1.7rem); font-weight: 300;
    color: rgba(255,255,255,0.65); margin-top: 12px; letter-spacing: 2px;
}
.hero-desc {
    font-size: 1.08rem; color: rgba(255,255,255,0.5);
    margin-bottom: 38px; line-height: 1.7; animation: fadeInUp 0.8s ease 0.3s both;
}
.hero-actions {
    display: flex; gap: 14px; justify-content: center; flex-wrap: wrap;
    margin-bottom: 44px; animation: fadeInUp 0.8s ease 0.45s both;
}
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 14px 30px; border-radius: var(--radius-md); font-size: 0.95rem;
    font-weight: 600; cursor: pointer; border: none;
    transition: all var(--transition-base); font-family: var(--font-body);
}
.btn svg { width: 18px; height: 18px; transition: transform var(--transition-fast); }
.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: #fff; box-shadow: 0 4px 20px rgba(255,107,53,0.35);
}
.btn-primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 32px rgba(255,107,53,0.45);
}
.btn-primary:hover svg { transform: translateX(3px); }
.btn-secondary {
    background: rgba(255,255,255,0.08); color: #fff;
    border: 1px solid rgba(255,255,255,0.18); backdrop-filter: blur(10px);
}
.btn-secondary:hover {
    background: rgba(255,255,255,0.16); transform: translateY(-2px) scale(1.02);
}
.btn-secondary:hover svg { transform: rotate(15deg); }

.magnetic { transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1); }

.hero-tech-tags {
    display: flex; gap: 10px; justify-content: center; flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.6s both;
}
.tech-tag {
    padding: 5px 14px; background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1); border-radius: var(--radius-full);
    font-size: 0.78rem; font-family: var(--font-mono); color: rgba(255,255,255,0.5); font-weight: 500;
}
.scroll-indicator {
    position: absolute; bottom: 36px; left: 50%; transform: translateX(-50%);
    z-index: 2; display: flex; flex-direction: column; align-items: center; gap: 8px;
    color: rgba(255,255,255,0.3); font-size: 0.72rem; animation: bounce 2.5s ease infinite;
}
.mouse {
    width: 22px; height: 34px; border: 2px solid rgba(255,255,255,0.25);
    border-radius: 12px; display: flex; justify-content: center; padding-top: 7px;
}
.wheel {
    width: 3px; height: 8px; background: rgba(255,255,255,0.4);
    border-radius: 3px; animation: scrollWheel 1.8s ease infinite;
}

/* ========== SECTIONS ========== */
section { padding: 100px 0; }
.section-header { text-align: center; margin-bottom: 64px; }
.section-label {
    display: inline-block; padding: 5px 16px;
    background: linear-gradient(135deg, rgba(99,102,241,0.08), rgba(255,107,53,0.08));
    color: var(--color-secondary); border-radius: var(--radius-full);
    font-size: 0.82rem; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 18px;
}
.section-title {
    font-size: clamp(2rem, 4vw, 2.8rem); font-weight: 800; line-height: 1.2;
    letter-spacing: -1px; margin-bottom: 16px; color: var(--color-text);
}
.section-desc { font-size: 1.05rem; color: var(--color-text-secondary); max-width: 520px; margin: 0 auto; }

/* ========== FEATURES ========== */
.features { background: var(--color-bg); }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feature-card {
    background: var(--color-bg); border: 1px solid var(--color-border-light);
    border-radius: var(--radius-xl); padding: 32px 28px;
    transition: all var(--transition-base); position: relative; overflow: hidden;
    transform-style: preserve-3d; perspective: 800px;
}
.feature-card::before {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(135deg, transparent 60%, rgba(99,102,241,0.04));
    opacity: 0; transition: var(--transition-base);
}
.feature-card:hover {
    transform: translateY(-8px) rotateX(2deg) rotateY(-1deg);
    box-shadow: var(--shadow-lg); border-color: transparent;
}
.feature-card:hover::before { opacity: 1; }
.feature-icon {
    width: 52px; height: 52px; border-radius: var(--radius-md);
    background: var(--icon-bg); display: flex; align-items: center; justify-content: center;
    margin-bottom: 20px; color: #fff; box-shadow: 0 8px 20px rgba(0,0,0,0.12);
    transition: transform var(--transition-spring);
}
.feature-card:hover .feature-icon { transform: scale(1.1) rotate(-5deg); }
.feature-icon svg { width: 24px; height: 24px; }
.feature-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; letter-spacing: -0.3px; }
.feature-card p { font-size: 0.9rem; color: var(--color-text-secondary); line-height: 1.65; margin-bottom: 16px; }
.feature-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.feature-tags span {
    padding: 3px 11px; background: var(--color-bg-tertiary); border-radius: var(--radius-full);
    font-size: 0.73rem; font-weight: 500; color: var(--color-text-muted); font-family: var(--font-mono);
}

/* ========== ARCHITECTURE ========== */
.architecture { background: var(--color-bg-secondary); }
.arch-diagram {
    display: flex; align-items: center; justify-content: center; gap: 0;
    margin-bottom: 56px; flex-wrap: wrap; padding: 40px 0;
}
.arch-node {
    display: flex; flex-direction: column; align-items: center; gap: 10px;
    padding: 28px 32px; background: var(--color-bg); border: 1px solid var(--color-border);
    border-radius: var(--radius-lg); min-width: 140px; text-align: center; transition: var(--transition-base);
}
.arch-node.highlight {
    border-color: var(--color-secondary); box-shadow: var(--shadow-glow);
    background: linear-gradient(135deg, #fafbff, #f5f3ff);
}
.arch-node span { font-weight: 600; font-size: 0.92rem; }
.arch-node small { font-size: 0.75rem; color: var(--color-text-muted); }
.arch-icon {
    width: 44px; height: 44px; border-radius: var(--radius-sm);
    background: var(--color-bg-tertiary); display: flex; align-items: center; justify-content: center;
    color: var(--color-text-secondary);
}
.arch-node.highlight .arch-icon {
    background: linear-gradient(135deg, var(--color-secondary), var(--color-secondary-light)); color: #fff;
}
.arch-icon svg { width: 22px; height: 22px; }
.arch-arrow { display: flex; flex-direction: column; align-items: center; padding: 0 12px; min-width: 90px; }
.arrow-line {
    flex: 1; width: 2px; min-height: 40px;
    background: linear-gradient(to bottom, var(--color-border), var(--color-secondary)); margin: 8px 0;
}
.arrow-head {
    width: 0; height: 0; border-left: 6px solid transparent;
    border-right: 6px solid transparent; border-top: 8px solid var(--color-secondary);
}
.arrow-label { font-size: 0.7rem; color: var(--color-text-muted); white-space: nowrap; margin-top: 4px; }
.arch-features { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.arch-feature-item {
    display: flex; gap: 16px; padding: 22px 26px; background: var(--color-bg);
    border-radius: var(--radius-lg); border: 1px solid var(--color-border-light); transition: var(--transition-fast);
}
.arch-feature-item:hover { border-color: var(--color-secondary); box-shadow: var(--shadow-sm); }
.arch-check { color: var(--color-accent-green); flex-shrink: 0; margin-top: 2px; }
.arch-check svg { width: 22px; height: 22px; }
.arch-feature-item strong { display: block; font-size: 0.95rem; margin-bottom: 4px; }
.arch-feature-item p { font-size: 0.85rem; color: var(--color-text-secondary); line-height: 1.5; }

/* ========== GUIDE ========== */
.guide { background: var(--color-bg); }
.guide-steps { display: flex; flex-direction: column; gap: 0; position: relative; }
.guide-steps::before {
    content: ''; position: absolute; left: 27px; top: 50px; bottom: 50px;
    width: 2px; background: linear-gradient(to bottom, var(--color-secondary), var(--color-primary)); border-radius: 2px;
}
.guide-step {
    display: flex; gap: 32px; align-items: flex-start; padding: 28px 0; position: relative;
}
.step-number {
    flex-shrink: 0; width: 54px; height: 54px; border-radius: 50%;
    background: linear-gradient(135deg, var(--color-secondary), var(--color-primary));
    color: #fff; display: flex; align-items: center; justify-content: center;
    font-size: 1.1rem; font-weight: 800; font-family: var(--font-mono);
    z-index: 1; box-shadow: 0 4px 16px rgba(99,102,241,0.25);
    transition: transform var(--transition-spring);
}
.guide-step:hover .step-number { transform: scale(1.1); }
.step-content { flex: 1; padding-top: 6px; }
.step-content h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; }
.step-content p { font-size: 0.92rem; color: var(--color-text-secondary); line-height: 1.65; }
.step-visual { flex-shrink: 0; }
.step-visual code {
    display: block; padding: 12px 18px; background: #1e1e2e; color: #cdd6f4;
    border-radius: var(--radius-md); font-family: var(--font-mono); font-size: 0.8rem;
    white-space: nowrap; border: 1px solid rgba(255,255,255,0.06); box-shadow: var(--shadow-sm);
}

/* ========== DOWNLOAD ========== */
.download { background: var(--color-bg-secondary); }
.download-grid {
    display: flex; justify-content: center;
    max-width: 520px; margin: 0 auto;
}
.download-card {
    display: flex; flex-direction: column;
    background: var(--color-bg); border: 1px solid var(--color-border-light);
    border-radius: var(--radius-xl); padding: 36px 32px;
    transition: all var(--transition-base);
    position: relative; overflow: hidden;
}
.download-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    opacity: 0; transition: var(--transition-base);
}
.download-card:hover {
    transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent;
}
.download-card:hover::before { opacity: 1; }
.download-icon-wrap { margin-bottom: 20px; }
.download-icon {
    width: 56px; height: 56px; border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    display: flex; align-items: center; justify-content: center;
    color: #fff; box-shadow: 0 8px 20px rgba(255,107,53,0.25);
    transition: transform var(--transition-spring);
}
.download-icon.icon-alt {
    background: linear-gradient(135deg, var(--color-secondary), var(--color-secondary-light));
    box-shadow: 0 8px 20px rgba(99,102,241,0.25);
}
.download-card:hover .download-icon { transform: scale(1.12) rotate(-5deg); }
.download-icon svg { width: 26px; height: 26px; }
.download-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 8px; }
.download-card > p { font-size: 0.9rem; color: var(--color-text-secondary); line-height: 1.6; margin-bottom: 18px; flex: 1; }
.download-meta {
    display: flex; gap: 16px; margin-bottom: 20px;
}
.download-meta span {
    display: flex; align-items: center; gap: 5px;
    font-size: 0.78rem; color: var(--color-text-muted); font-family: var(--font-mono);
}
.download-meta svg { width: 14px; height: 14px; }
.download-action {
    display: flex; align-items: center; justify-content: space-between;
    padding-top: 16px; border-top: 1px solid var(--color-border-light);
    font-weight: 600; font-size: 0.92rem; color: var(--color-primary);
}
.download-action svg { width: 18px; height: 18px; transition: transform var(--transition-fast); }
.download-card:hover .download-action svg { transform: translateX(4px); }

.download-notice {
    display: flex; gap: 14px; align-items: flex-start;
    max-width: 600px; margin: 40px auto 0;
    padding: 18px 22px;
    background: rgba(99,102,241,0.05); border: 1px solid rgba(99,102,241,0.12);
    border-radius: var(--radius-md);
}
.notice-icon {
    color: var(--color-secondary); flex-shrink: 0; margin-top: 2px;
}
.notice-icon svg { width: 20px; height: 20px; }
.notice-text strong { display: block; font-size: 0.88rem; margin-bottom: 4px; color: var(--color-text); }
.notice-text p { font-size: 0.82rem; color: var(--color-text-secondary); line-height: 1.55; }

.qq-group { margin-top: 20px; }
.qq-group a {
    display: flex; align-items: center; gap: 16px;
    padding: 18px 24px;
    background: linear-gradient(135deg, #12B7F5, #06A7E2);
    border-radius: var(--radius-lg);
    color: #fff; transition: all var(--transition-base);
    box-shadow: 0 4px 20px rgba(18,183,245,0.25);
}
.qq-group a:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 28px rgba(18,183,245,0.35);
}
.qq-icon {
    width: 44px; height: 44px; border-radius: var(--radius-sm);
    background: rgba(255,255,255,0.2);
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.qq-icon svg { width: 22px; height: 22px; }
.qq-info { flex: 1; }
.qq-info h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 3px; }
.qq-info p { font-size: 0.8rem; opacity: 0.85; line-height: 1.4; }
.qq-arrow svg { width: 20px; height: 20px; transition: transform var(--transition-fast); }
.qq-group a:hover .qq-arrow svg { transform: translateX(4px); }

/* ========== COMMANDS ========== */
.commands { background: var(--color-bg-secondary); }
.commands-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px;
}
.command-card {
    background: var(--color-bg); border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg); padding: 24px; transition: all var(--transition-base);
    position: relative; overflow: hidden;
}
.command-card::after {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    opacity: 0; transition: var(--transition-base);
}
.command-card:hover {
    transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: transparent;
}
.command-card:hover::after { opacity: 1; }
.command-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 10px; gap: 10px;
}
.command-name {
    font-family: var(--font-mono); font-size: 0.85rem; font-weight: 600;
    color: var(--color-text); background: var(--color-bg-tertiary);
    padding: 4px 10px; border-radius: var(--radius-xs);
}
.command-cat {
    padding: 2px 10px; border-radius: var(--radius-full); font-size: 0.7rem;
    font-weight: 600; white-space: nowrap; letter-spacing: 0.5px;
}
.cat-query { background: rgba(99,102,241,0.1); color: var(--color-secondary); }
.cat-set { background: rgba(245,158,11,0.1); color: #D97706; }
.cat-action { background: rgba(236,72,153,0.1); color: var(--color-accent-pink); }
.cat-info { background: rgba(16,185,129,0.1); color: var(--color-accent-green); }
.command-card p { font-size: 0.85rem; color: var(--color-text-secondary); line-height: 1.55; }

/* ========== AUTH QUERY ========== */
.auth-query { background: var(--color-bg); }
.auth-query-box {
    max-width: 640px; margin: 0 auto;
    background: var(--color-bg); border: 1px solid var(--color-border);
    border-radius: var(--radius-xl); padding: 40px; box-shadow: var(--shadow-md);
}
.auth-input-group {
    display: flex; align-items: center; gap: 12px;
    background: var(--color-bg-secondary); border: 2px solid var(--color-border);
    border-radius: var(--radius-lg); padding: 4px 6px 4px 18px;
    transition: all var(--transition-base);
}
.auth-input-group:focus-within {
    border-color: var(--color-secondary); box-shadow: 0 0 0 4px rgba(99,102,241,0.10);
}
.auth-input-group svg { width: 20px; height: 20px; color: var(--color-text-muted); flex-shrink: 0; }
.auth-input-group input {
    flex: 1; border: none; outline: none; background: transparent;
    font-size: 0.95rem; font-family: var(--font-mono); color: var(--color-text);
    padding: 12px 0;
}
.auth-input-group input::placeholder { color: var(--color-text-muted); }
.auth-input-group .btn { white-space: nowrap; padding: 12px 24px; }

.auth-result { display: none; margin-top: 24px; }
.auth-result.show { display: block; animation: fadeInUp 0.4s ease both; }
.auth-result .result-card {
    display: flex; align-items: center; gap: 16px; padding: 20px 24px;
    border-radius: var(--radius-md); border: 1px solid;
}
.auth-result .result-card.authorized {
    background: rgba(16,185,129,0.06); border-color: rgba(16,185,129,0.2);
}
.auth-result .result-card.unauthorized {
    background: rgba(239,68,68,0.04); border-color: rgba(239,68,68,0.2);
}
.auth-result .result-card.loading {
    background: rgba(99,102,241,0.05); border-color: rgba(99,102,241,0.15);
}
.auth-result .result-icon {
    width: 44px; height: 44px; border-radius: 50%; display: flex;
    align-items: center; justify-content: center; flex-shrink: 0;
}
.result-card.authorized .result-icon { background: rgba(16,185,129,0.12); color: var(--color-accent-green); }
.result-card.unauthorized .result-icon { background: rgba(239,68,68,0.1); color: #EF4444; }
.result-card.loading .result-icon { background: rgba(99,102,241,0.1); color: var(--color-secondary); }
.auth-result .result-info h4 { font-size: 1rem; font-weight: 700; margin-bottom: 4px; }
.auth-result .result-info p { font-size: 0.85rem; color: var(--color-text-secondary); line-height: 1.5; }
.result-card.authorized .result-info h4 { color: var(--color-accent-green); }
.result-card.unauthorized .result-info h4 { color: #EF4444; }
.result-card.loading .result-info h4 { color: var(--color-secondary); }

.spinner {
    width: 20px; height: 20px; border: 2px solid transparent;
    border-top-color: currentColor; border-radius: 50%;
    animation: spin 0.7s linear infinite; display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ========== STATS ========== */
.stats {
    background: linear-gradient(165deg, #0F0C29 0%, #1a1442 50%, #24243e 100%);
    position: relative; overflow: hidden;
}
.stats::before {
    content: ''; position: absolute; inset: 0;
    background: radial-gradient(circle at 30% 50%, rgba(99,102,241,0.12) 0%, transparent 60%),
                radial-gradient(circle at 70% 50%, rgba(255,107,53,0.08) 0%, transparent 60%);
}
.stats .container { position: relative; z-index: 1; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
.stat-item {
    text-align: center; padding: 36px 20px;
    background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-xl); backdrop-filter: blur(10px); transition: var(--transition-base);
}
.stat-item:hover {
    background: rgba(255,255,255,0.07); border-color: rgba(255,255,255,0.14);
    transform: translateY(-4px);
}
.stat-number {
    font-size: clamp(2.2rem, 4vw, 3rem); font-weight: 900; color: #fff;
    font-family: var(--font-mono); letter-spacing: -1px; margin-bottom: 6px;
}
.stat-label { font-size: 0.88rem; color: rgba(255,255,255,0.5); font-weight: 500; margin-bottom: 14px; }
.stat-bar { height: 4px; background: rgba(255,255,255,0.08); border-radius: 4px; overflow: hidden; }
.stat-bar-fill {
    height: 100%; width: var(--width);
    background: linear-gradient(90deg, var(--color-secondary), var(--color-primary));
    border-radius: 4px; transform-origin: left;
    animation: barGrow 1.2s ease forwards;
    animation-delay: calc(var(--delay, 0) * 120ms + 0.3s); transform: scaleX(0);
}

/* ========== BACK TO TOP ========== */
.back-to-top {
    position: fixed; bottom: 32px; right: 32px; z-index: 999;
    width: 46px; height: 46px; border-radius: 50%;
    background: linear-gradient(135deg, var(--color-secondary), var(--color-primary));
    color: #fff; border: none; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 4px 20px rgba(99,102,241,0.3);
    opacity: 0; visibility: hidden; transform: translateY(16px) scale(0.85);
    transition: all var(--transition-spring);
}
.back-to-top svg { width: 22px; height: 22px; }
.back-to-top.visible {
    opacity: 1; visibility: visible; transform: translateY(0) scale(1);
}
.back-to-top:hover {
    transform: translateY(-3px) scale(1.08);
    box-shadow: 0 8px 28px rgba(99,102,241,0.4);
}

/* ========== FOOTER ========== */
.footer {
    background: #0a0a0f; color: rgba(255,255,255,0.6); padding: 64px 0 32px;
}
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 48px; }
.footer-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-logo .logo-icon { background: linear-gradient(135deg, var(--color-primary), var(--color-secondary)); }
.footer-logo .logo-text { color: #fff; font-size: 1.2rem; font-weight: 700; }
.footer-brand p { font-size: 0.88rem; line-height: 1.7; color: rgba(255,255,255,0.4); }
.footer-links h4 { color: #fff; font-size: 0.9rem; font-weight: 600; margin-bottom: 18px; }
.footer-links a,
.footer-links span {
    display: block; font-size: 0.85rem; color: rgba(255,255,255,0.4);
    padding: 5px 0; transition: var(--transition-fast);
}
.footer-links a:hover { color: var(--color-primary-light); }
.status-online { display: flex; align-items: center; gap: 8px; color: var(--color-accent-green) !important; font-weight: 500; }
.status-dot {
    width: 8px; height: 8px; background: var(--color-accent-green);
    border-radius: 50%; animation: pulse 2s ease infinite;
}
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08); padding-top: 24px;
    display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
}
.footer-bottom p { font-size: 0.8rem; color: rgba(255,255,255,0.3); }

/* ========== ANIMATIONS ========== */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(28px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInDown { from { opacity: 0; transform: translateY(-16px); } to { opacity: 1; transform: translateY(0); } }
@keyframes bounce { 0%, 100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(8px); } }
@keyframes scrollWheel { 0% { opacity: 1; transform: translateY(0); } 100% { opacity: 0; transform: translateY(10px); } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
@keyframes barGrow { from { width: 0%; } to { width: 100%; } }
@keyframes loaderPulse { 0%, 100% { transform: scale(1); opacity: 1; } 50% { transform: scale(1.08); opacity: 0.85; } }
@keyframes loaderFade { 0% { opacity: 1; } 100% { opacity: 0; visibility: hidden; } }
@keyframes shimmer { 0% { background-position: -200% center; } 100% { background-position: 200% center; } }

/* ========== LOADER ========== */
.loader {
    position: fixed;
    inset: 0;
    z-index: 99999;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #0a0a1a;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}
.loader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}
.loader-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}
.loader-logo {
    width: 72px;
    height: 72px;
    border-radius: 20px;
    background: linear-gradient(135deg, #FF6B35, #6366F1);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: loaderPulse 2.2s ease-in-out infinite;
    box-shadow: 0 0 48px rgba(99, 102, 241, 0.3), 0 0 24px rgba(255, 107, 53, 0.2);
}
.loader-icon {
    font-size: 34px;
    font-weight: 900;
    color: #fff;
    line-height: 1;
}
.loader-text {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 4px;
    text-transform: uppercase;
    background: linear-gradient(90deg, #FF6B35, #818CF8, #EC4899, #FF6B35);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: shimmer 3s linear infinite;
}
.loader-subtext {
    font-family: var(--font-body);
    font-size: 12px;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.35);
    letter-spacing: 2px;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.8s;
}
.loader-bar {
    width: 160px;
    height: 3px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 4px;
    overflow: hidden;
}
.loader-bar-inner {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, #FF6B35, #6366F1, #EC4899);
    border-radius: 4px;
    animation: barGrow 2.5s ease-out forwards;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1023px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .arch-features { grid-template-columns: 1fr; }
    .commands-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 767px) {
    :root { --nav-height: 60px; }
    section { padding: 56px 0; }
    .container { padding: 0 16px; }
    .section-header { margin-bottom: 40px; }
    .section-title { font-size: 1.7rem; }

    .nav-links {
        display: none; position: absolute; top: var(--nav-height); left: 0; right: 0;
        background: rgba(255,255,255,0.98); backdrop-filter: blur(20px);
        flex-direction: column; padding: 12px;
        border-bottom: 1px solid var(--color-border); box-shadow: var(--shadow-lg);
        max-height: calc(100vh - 60px); overflow-y: auto;
    }
    .nav-links.open { display: flex; }
    .nav-link { padding: 14px 18px; font-size: 0.95rem; border-radius: var(--radius-sm); }
    .nav-toggle { display: flex; }

    .hero-content { padding: 90px 18px 70px; }
    .title-line { letter-spacing: -1px; font-size: clamp(2.4rem, 10vw, 3.5rem); }
    .title-sub { font-size: 1rem; letter-spacing: 1px; }
    .hero-desc { font-size: 0.92rem; margin-bottom: 28px; }
    .hero-actions { flex-direction: column; align-items: center; gap: 12px; }
    .btn { width: 100%; max-width: 280px; justify-content: center; padding: 14px 24px; }
    .hero-tech-tags { gap: 8px; }
    .tech-tag { font-size: 0.72rem; padding: 4px 10px; }
    .scroll-indicator { display: none; }

    .features-grid { grid-template-columns: 1fr; gap: 14px; }
    .feature-card { padding: 22px 18px; border-radius: var(--radius-lg); }
    .feature-icon { width: 46px; height: 46px; margin-bottom: 16px; }
    .feature-icon svg { width: 22px; height: 22px; }
    .feature-card h3 { font-size: 1.05rem; }
    .feature-card p { font-size: 0.85rem; margin-bottom: 12px; }
    .feature-tags span { font-size: 0.7rem; padding: 2px 9px; }

    .arch-diagram { flex-direction: column; gap: 12px; padding: 24px 0; }
    .arch-node { padding: 20px 20px; min-width: auto; }
    .arch-node small { font-size: 0.7rem; }
    .arch-arrow { flex-direction: row; min-width: auto; padding: 6px 0; }
    .arrow-line { width: 32px; min-height: 2px; background: linear-gradient(to right, var(--color-border), var(--color-secondary)); }
    .arrow-head { border-left: 8px solid var(--color-secondary); border-top: 5px solid transparent; border-bottom: 5px solid transparent; border-right: none; }
    .arrow-label { font-size: 0.65rem; }
    .arch-features { gap: 12px; }
    .arch-feature-item { padding: 16px 18px; }
    .arch-check svg { width: 20px; height: 20px; }
    .arch-feature-item strong { font-size: 0.88rem; }
    .arch-feature-item p { font-size: 0.8rem; }

    .guide-step { flex-direction: column; gap: 14px; align-items: stretch; padding: 20px 0; }
    .guide-steps::before { display: none; }
    .step-number { width: 42px; height: 42px; font-size: 0.9rem; }
    .step-content h3 { font-size: 1.02rem; }
    .step-content p { font-size: 0.86rem; }
    .step-visual code { white-space: normal; word-break: break-all; font-size: 0.72rem; padding: 10px 14px; }

    .download-grid { flex-direction: column; align-items: stretch; max-width: 100%; }
    .download-card { padding: 26px 22px; }
    .download-icon { width: 48px; height: 48px; }
    .download-icon svg { width: 23px; height: 23px; }
    .download-card h3 { font-size: 1.08rem; }
    .download-card > p { font-size: 0.86rem; }
    .download-meta { flex-wrap: wrap; gap: 10px; }
    .download-meta span { font-size: 0.74rem; }
    .download-notice { flex-direction: row; padding: 14px 16px; gap: 10px; }
    .notice-icon { display: none; }
    .notice-text strong { font-size: 0.84rem; }
    .notice-text p { font-size: 0.78rem; }
    .qq-group a { padding: 15px 18px; gap: 12px; }
    .qq-icon { width: 38px; height: 38px; }
    .qq-icon svg { width: 19px; height: 19px; }
    .qq-info h4 { font-size: 0.88rem; }
    .qq-info p { font-size: 0.76rem; }
    .qq-arrow svg { width: 18px; height: 18px; }

    .commands-grid { grid-template-columns: 1fr; gap: 12px; }
    .command-card { padding: 18px 16px; }
    .command-name { font-size: 0.8rem; }
    .command-cat { font-size: 0.65rem; padding: 2px 8px; }
    .command-card p { font-size: 0.82rem; }

    .auth-query-box { padding: 24px 18px; border-radius: var(--radius-lg); }
    .auth-input-group { flex-direction: column; padding: 12px; gap: 10px; }
    .auth-input-group input { padding: 12px 14px; font-size: 0.88rem; }
    .auth-input-group .btn { max-width: 100%; width: 100%; }
    .result-card { flex-direction: column; text-align: center; padding: 18px; gap: 12px; }
    .result-icon { margin: 0 auto; }

    .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
    .stat-item { padding: 20px 12px; }
    .stat-number { font-size: 1.7rem; }
    .stat-label { font-size: 0.8rem; margin-bottom: 10px; }

    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .footer-brand p { font-size: 0.84rem; }
    .footer-links a,
    .footer-links span { font-size: 0.82rem; padding: 4px 0; }
    .footer-bottom { flex-direction: column; text-align: center; gap: 6px; }
    .footer-bottom p { font-size: 0.75rem; }

    .back-to-top { bottom: 18px; right: 18px; width: 40px; height: 40px; }
    .back-to-top svg { width: 20px; height: 20px; }
}

/* 小屏手机额外优化 */
@media (max-width: 380px) {
    .hero-content { padding: 80px 14px 60px; }
    .title-line { font-size: 2.2rem; }
    .stats-grid { grid-template-columns: 1fr; }
    .stat-number { font-size: 1.6rem; }
}

/* ========== 设备类自适应 ========== */
.device-mobile .hero-glow-1,
.device-small .hero-glow-1 {
    width: 300px; height: 300px;
}
.device-mobile .hero-glow-2,
.device-small .hero-glow-2 {
    width: 240px; height: 240px;
}

.device-mobile .hero-content,
.device-small .hero-content {
    padding-top: clamp(80px, 15vh, 110px);
}

.device-mobile .features-grid,
.device-small .features-grid {
    gap: 12px;
}

.device-mobile .feature-card,
.device-small .feature-card {
    padding: 20px 16px;
}

.device-mobile .arch-diagram,
.device-small .arch-diagram {
    gap: 10px;
}

.device-mobile .arch-node,
.device-small .arch-node {
    padding: 16px 14px;
}

.device-mobile .guide-step,
.device-small .guide-step {
    gap: 12px;
}

.device-mobile .download-card,
.device-small .download-card {
    padding: 22px 18px;
}

.device-mobile .qq-group a,
.device-small .qq-group a {
    padding: 13px 16px;
}

.device-mobile .auth-query-box,
.device-small .auth-query-box {
    padding: 20px 16px;
}

.device-mobile .stats-grid,
.device-small .stats-grid {
    gap: 10px;
}

/* 高DPI屏幕优化 */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .nav-logo { -webkit-font-smoothing: antialiased; }
    .hero-title { -webkit-font-smoothing: antialiased; }
    .feature-icon svg,
    .download-icon svg,
    .qq-icon svg { shape-rendering: geometricPrecision; }
}

/* 横屏手机适配 */
@media (max-width: 767px) and (orientation: landscape) {
    .hero { min-height: auto; padding: 60px 0; }
    .hero-content { padding: 70px 18px 40px; }
    .title-line { font-size: 2rem; }
    .section-header { margin-bottom: 28px; }
    section { padding: 36px 0; }
    .scroll-indicator { display: none; }
}