:root {
    --black: #0A0A0A;
    --white: #FFFFFF;
    --pink: #FF6B9D;
    --pink-soft: #FFF5F9;
    --pink-light: #FFB7C5;
    --pink-deep: #E85D8A;
    --gray-50: #FAFAFA;
    --gray-100: #F5F5F5;
    --gray-200: #E5E5E5;
    --gray-400: #A3A3A3;
    --gray-500: #737373;
    --gray-700: #404040;
    --shadow-hard: 6px 6px 0 var(--black);
    --shadow-hard-sm: 4px 4px 0 var(--black);
    --shadow-hard-lg: 12px 12px 0 var(--black);
    --border: 2px solid var(--black);
    --font-serif: "Noto Serif SC", "Fraunces", serif;
    --font-sans: "Noto Sans SC", "DM Sans", sans-serif;
    --font-mono: "Space Mono", monospace;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    background: var(--white);
    color: var(--black);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

.cursor-wrapper { position: fixed; top: 0; left: 0; z-index: 999998; pointer-events: none; }
.cursor-dot {
    position: fixed; top: 0; left: 0; width: 8px; height: 8px;
    background: var(--pink); border-radius: 50%;
    transform: translate(-50%, -50%); transition: width .2s, height .2s;
}
.cursor-ring {
    position: fixed; top: 0; left: 0;
    width: var(--width, 50px); height: var(--height, 50px);
    border: 2px solid var(--color, var(--pink)); border-radius: 0;
    transform: translate(-50%, -50%);
    transition: width .25s ease, height .25s ease, border-color .15s;
}
.cursor-ring .corner-tl, .cursor-ring .corner-tr {
    position: absolute; width: 8px; height: 8px;
    border: 2px solid var(--color, var(--pink));
}
.cursor-ring .corner-tl { top: -2px; left: -2px; border-right: none; border-bottom: none; }
.cursor-ring .corner-tr { top: -2px; right: -2px; border-left: none; border-bottom: none; }
@media (max-width: 767px) { .cursor-wrapper { display: none; } }

.loading-overlay {
    position: fixed; inset: 0;
    background: linear-gradient(180deg, var(--pink-soft) 0%, #F5F7FA 50%, var(--white) 100%);
    z-index: 999999; transition: opacity .8s ease, visibility .8s ease; pointer-events: auto;
}
.loading-overlay.hidden { opacity: 0; visibility: hidden; pointer-events: none; }
#loading-particle-canvas { position: absolute; inset: 0; width: 100%; height: 100%; cursor: pointer; }

.navbar {
    position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
    background: rgba(255, 255, 255, 0.95); backdrop-filter: blur(8px);
    border-bottom: var(--border); transition: box-shadow .3s ease;
}
.navbar.scrolled { box-shadow: 0 10px 30px rgba(255, 107, 157, 0.08); }
.nav-inner { display: flex; justify-content: space-between; align-items: center; height: 64px; }
.nav-brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--black); }
.nav-icon { width: 36px; height: 36px; object-fit: cover; border: var(--border); }
.nav-title { font-family: var(--font-serif); font-weight: 900; font-size: 20px; letter-spacing: -0.02em; }
.nav-links { display: flex; align-items: center; gap: 8px; }
.nav-links a {
    padding: 8px 16px; font-size: 14px; font-weight: 500; text-decoration: none;
    color: var(--gray-700); border-bottom: 2px solid transparent; transition: all .2s;
}
.nav-links a:hover { color: var(--pink); border-bottom-color: var(--pink); background: var(--pink-soft); }
.nav-join { color: var(--gray-700); }
.nav-join:hover { color: var(--pink); }
.nav-cta {
    background: var(--black); color: var(--white); font-weight: 700; font-size: 14px;
    text-transform: uppercase; letter-spacing: 0.05em; border: var(--border);
    box-shadow: var(--shadow-hard-sm); transition: all .2s; cursor: pointer;
    padding: 10px 20px; margin-left: 8px;
}
.nav-cta:hover {
    background: var(--pink); border-color: var(--pink); color: var(--white);
    box-shadow: 4px 4px 0 var(--pink-deep); transform: translateY(-2px);
}
.nav-menu-btn { display: none; background: none; border: none; cursor: pointer; padding: 8px; color: var(--black); }

.sidebar-overlay { position: fixed; inset: 0; z-index: 1100; background: rgba(0,0,0,0.6); opacity: 0; visibility: hidden; transition: opacity .3s, visibility .3s; }
.sidebar-overlay.open { opacity: 1; visibility: visible; }
.sidebar {
    position: fixed; top: 0; right: 0; height: 100%; width: 85%; max-width: 360px; z-index: 1101;
    background: var(--white); transform: translateX(100%); transition: transform .3s ease;
    display: flex; flex-direction: column; border-left: var(--border);
}
.sidebar.open { transform: translateX(0); box-shadow: -20px 0 40px rgba(0,0,0,0.25); }
.sidebar-header { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; border-bottom: var(--border); }
.sidebar-brand { font-family: var(--font-serif); font-weight: 700; font-size: 16px; }
.sidebar-close { width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; border: var(--border); background: var(--white); cursor: pointer; transition: all .15s; }
.sidebar-close:hover { background: var(--black); color: var(--white); }
.sidebar nav { flex: 1; overflow-y: auto; padding: 12px; }
.sidebar nav a { display: block; padding: 14px 16px; font-weight: 700; font-size: 14px; text-decoration: none; color: var(--black); border: 2px solid transparent; margin-bottom: 8px; transition: all .2s; cursor: pointer; background: none; width: 100%; text-align: left; }
.sidebar nav a:hover { border-color: var(--black); box-shadow: var(--shadow-hard-sm); }
.sidebar-footer { padding: 16px 20px; border-top: var(--border); background: var(--black); color: var(--white); }
.sidebar-footer p { font-size: 10px; font-family: var(--font-mono); letter-spacing: 0.3em; text-transform: uppercase; opacity: 0.4; margin-bottom: 6px; }

.hero {
    min-height: 100vh; display: flex; align-items: center;
    background: var(--white); padding: 80px 0 40px; position: relative; overflow: hidden;
}
.hero::before {
    content: ''; position: absolute; top: 0; right: 0; width: 600px; height: 600px;
    border-left: 2px solid rgba(0,0,0,0.05); border-top: 2px solid rgba(0,0,0,0.05);
    border-radius: 50%; transform: translate(33%, -33%); pointer-events: none;
}
.hero::after {
    content: ''; position: absolute; bottom: 80px; left: 40px; width: 128px; height: 128px;
    border: 2px solid rgba(0,0,0,0.04); transform: rotate(12deg); pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; max-width: 720px; }
.hero-tag {
    display: inline-flex; align-items: center; gap: 12px;
    font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.25em;
    text-transform: uppercase; color: var(--gray-400); margin-bottom: 32px;
}
.hero-tag::before { content: ''; width: 32px; height: 2px; background: var(--black); }
.hero-title {
    font-family: var(--font-serif); font-size: clamp(48px, 8vw, 96px);
    font-weight: 900; line-height: 0.95; letter-spacing: -0.04em; margin-bottom: 24px;
}
.hero-title .accent { color: var(--pink); }
.hero-subtitle { font-size: clamp(20px, 3vw, 32px); font-weight: 600; margin-bottom: 24px; color: var(--gray-700); }
.hero-desc { font-size: 17px; line-height: 1.7; margin-bottom: 40px; color: var(--gray-500); max-width: 540px; }

.btn {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 16px 32px; font-weight: 700; font-size: 14px;
    text-decoration: none; cursor: pointer; border: var(--border);
    transition: all .25s; text-transform: uppercase; letter-spacing: 0.05em;
    font-family: var(--font-sans);
}
.btn svg { flex-shrink: 0; }
.btn-primary { background: var(--black); color: var(--white); box-shadow: var(--shadow-hard); }
.btn-primary:hover { background: var(--pink); border-color: var(--pink); box-shadow: 6px 6px 0 var(--pink-deep); transform: translateY(-2px); }
.btn-hero-download { margin-bottom: 8px; }
.btn-footer-download { background: var(--white); color: var(--black); border: var(--border); box-shadow: var(--shadow-hard-sm); margin-top: 16px; }
.btn-footer-download:hover { background: var(--pink); color: var(--white); border-color: var(--pink); box-shadow: 4px 4px 0 var(--pink-deep); transform: translateY(-2px); }

.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; max-width: 560px; margin-top: 48px; }
.stat-card {
    position: relative; background: var(--white); border: var(--border);
    padding: 20px; overflow: hidden; box-shadow: var(--shadow-hard-sm);
    transition: transform .3s;
}
.stat-card:hover { transform: translateY(-4px); }
.stat-card::before { content: ''; position: absolute; top: 0; left: 0; width: 6px; height: 100%; background: var(--pink); }
.stat-label { font-family: var(--font-mono); font-size: 10px; font-weight: 700; letter-spacing: 0.25em; text-transform: uppercase; color: var(--gray-400); margin-bottom: 8px; padding-left: 14px; }
.stat-number { font-family: var(--font-serif); font-size: 28px; font-weight: 900; padding-left: 14px; }
.stat-suffix { font-size: 16px; font-weight: 700; margin-left: 2px; }

section { padding: 96px 0; }
.section-tag {
    display: block; text-align: center; font-family: var(--font-mono);
    font-size: 10px; letter-spacing: 0.35em; text-transform: uppercase;
    color: var(--gray-400); margin-bottom: 16px;
}
.section-title {
    text-align: center; font-family: var(--font-serif);
    font-size: clamp(28px, 4vw, 44px); font-weight: 800; margin-bottom: 12px;
    letter-spacing: -0.02em; position: relative; display: inline-block;
    width: 100%;
}
.section-title::after {
    content: ''; position: absolute; bottom: -8px; left: 50%; transform: translateX(-50%);
    width: 64px; height: 3px; background: var(--pink);
}
.section-desc { text-align: center; font-family: var(--font-mono); font-size: 14px; color: var(--gray-500); margin-bottom: 40px; }

.features { background: var(--gray-50); border-top: var(--border); border-bottom: var(--border); }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 48px; }
.feature-card {
    background: var(--white); border: var(--border); border-bottom: 4px solid var(--black);
    padding: 32px; transition: all .3s;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: 8px 8px 0 var(--pink-light); }
.feature-num {
    display: inline-flex; align-items: center; justify-content: center;
    width: 56px; height: 56px; background: var(--black); color: var(--white);
    font-family: var(--font-serif); font-size: 22px; font-weight: 900; margin-bottom: 20px;
}
.feature-card h3 { font-family: var(--font-sans); font-size: 18px; font-weight: 700; margin-bottom: 12px; }
.feature-card p { font-size: 14px; line-height: 1.7; color: var(--gray-500); }

.preview { background: var(--white); }

.preview-controls {
    display: flex; justify-content: center; align-items: center;
    flex-wrap: wrap; gap: 16px; margin: 32px 0 40px;
}
.preview-tabs {
    display: flex; gap: 12px; flex-wrap: wrap; justify-content: center;
}
.preview-tab {
    padding: 10px 28px; border: var(--border); background: var(--white);
    font-weight: 700; font-size: 15px; cursor: pointer; transition: all .2s;
    box-shadow: var(--shadow-hard-sm); font-family: var(--font-sans);
}
.preview-tab:hover { transform: translateY(-2px); }
.preview-tab.active { background: var(--black); color: var(--white); box-shadow: 4px 4px 0 var(--pink); }

.device-toggle { display: flex; gap: 8px; }
.device-btn {
    padding: 8px 20px; border: var(--border); background: var(--white);
    font-weight: 600; font-size: 13px; cursor: pointer; transition: all .2s;
    font-family: var(--font-mono); letter-spacing: 0.05em;
}
.device-btn:hover { transform: translateY(-2px); }
.device-btn.active { background: var(--pink); color: var(--white); border-color: var(--pink); }

.device-toggle { display: none; }

.compare-row { display: none; }
.compare-row.active { display: flex; gap: 32px; justify-content: center; align-items: flex-start; }
.compare-item.phone-item { flex: 0 0 220px; max-width: 220px; }
.compare-item.pad-item { flex: 1 1 auto; max-width: 640px; }

.compare-slider {
    position: relative; overflow: hidden; border: var(--border);
    box-shadow: var(--shadow-hard-sm); cursor: ew-resize;
    user-select: none; -webkit-user-select: none; touch-action: none;
    background: var(--gray-100);
}
.compare-layer.light { position: relative; width: 100%; z-index: 0; }
.compare-layer.light img { display: block; width: 100%; height: auto; }
.compare-layer.dark { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 1; clip-path: inset(0 0 0 50%); }
.compare-layer.dark img { display: block; width: 100%; height: 100%; object-fit: cover; }

.compare-divider {
    position: absolute; top: 0; left: 50%; width: 4px; height: 100%;
    background: var(--white); border-left: 1px solid var(--black); border-right: 1px solid var(--black);
    transform: translateX(-50%); pointer-events: none; z-index: 2;
}
.compare-handle {
    position: absolute; top: 50%; left: 50%; width: 40px; height: 40px;
    background: var(--white); border: 2px solid var(--black); border-radius: 50%;
    transform: translate(-50%, -50%); box-shadow: 0 2px 8px rgba(0,0,0,0.2);
    display: flex; align-items: center; justify-content: center;
}
.compare-handle::before, .compare-handle::after {
    content: ''; display: inline-block; width: 6px; height: 6px;
    border-top: 2px solid var(--black); border-right: 2px solid var(--black);
    margin: 0 3px;
}
.compare-handle::before { transform: rotate(-135deg); }
.compare-handle::after { transform: rotate(45deg); }

.highlights { background: var(--gray-50); border-top: var(--border); border-bottom: var(--border); }
.highlight-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 48px; }
.highlight-item {
    text-align: center; padding: 32px 20px; background: var(--white);
    border: var(--border); transition: all .3s;
}
.highlight-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-hard); }
.highlight-item h4 { font-family: var(--font-serif); font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.highlight-item p { font-size: 14px; color: var(--gray-500); }

.footer { background: var(--black); color: var(--white); padding: 80px 0 40px; border-top: var(--border); position: relative; scroll-margin-top: 80px; }
.footer::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px; background: var(--pink); }
.footer-inner { display: flex; flex-direction: column; align-items: center; gap: 20px; text-align: center; }
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-icon { width: 40px; height: 40px; object-fit: cover; border: 2px solid rgba(255,255,255,0.2); }
.footer-brand span { font-family: var(--font-serif); font-size: 20px; font-weight: 700; }
.footer-text { font-size: 13px; color: rgba(255,255,255,0.5); }
.footer-links { display: flex; gap: 24px; }
.footer-links a { color: rgba(255,255,255,0.6); text-decoration: none; font-size: 14px; transition: color .2s; }
.footer-links a:hover { color: var(--pink); }

.download-modal-overlay {
    position: fixed; inset: 0; z-index: 2000; background: rgba(0,0,0,0.7);
    backdrop-filter: blur(4px); opacity: 0; visibility: hidden;
    transition: opacity .3s ease, visibility .3s ease;
    display: flex; align-items: center; justify-content: center; padding: 20px;
}
.download-modal-overlay.open { opacity: 1; visibility: visible; }
.download-modal {
    position: relative; background: var(--white); border: var(--border);
    box-shadow: var(--shadow-hard-lg); width: 100%; max-width: 480px;
    transform: scale(0.9) translateY(20px); transition: transform .3s ease;
}
.download-modal-overlay.open .download-modal { transform: scale(1) translateY(0); }
.modal-close {
    position: absolute; top: 12px; right: 12px; width: 36px; height: 36px;
    display: flex; align-items: center; justify-content: center;
    border: 2px solid transparent; background: var(--gray-100); cursor: pointer;
    transition: all .2s; color: var(--gray-500);
}
.modal-close:hover { background: var(--black); color: var(--white); border-color: var(--black); }
.modal-header { padding: 32px 32px 20px; text-align: center; border-bottom: 2px solid var(--gray-200); }
.modal-tag { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.35em; text-transform: uppercase; color: var(--gray-400); display: block; margin-bottom: 8px; }
.modal-title { font-family: var(--font-serif); font-size: 24px; font-weight: 800; margin-bottom: 8px; }
.modal-subtitle { font-family: var(--font-mono); font-size: 12px; color: var(--gray-500); }
.modal-options { padding: 20px 24px 24px; display: flex; flex-direction: column; gap: 12px; }
.modal-option {
    display: flex; align-items: center; gap: 16px; padding: 16px 20px;
    border: var(--border); text-decoration: none; color: var(--black);
    transition: all .25s; background: var(--white);
}
.modal-option:hover { transform: translateX(4px); box-shadow: var(--shadow-hard-sm); background: var(--pink-soft); }
.option-icon {
    width: 48px; height: 48px; display: flex; align-items: center; justify-content: center;
    border: var(--border); flex-shrink: 0;
}
.github-icon { background: var(--black); color: var(--white); }
.cloud-icon { background: #1890ff; color: var(--white); }
.lanzou-icon { background: #52c41a; color: var(--white); }
.option-info { flex: 1; }
.option-name { font-weight: 700; font-size: 16px; margin-bottom: 2px; }
.option-desc { font-size: 12px; color: var(--gray-500); }

.reveal { opacity: 0; transform: translateY(30px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in, .reveal.active { opacity: 1; transform: translateY(0); }

.main { opacity: 0; transition: opacity .6s ease; }
.main.visible { opacity: 1; }

@media (max-width: 1024px) {
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .highlight-list { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-menu-btn { display: block; }
    section { padding: 64px 0; }
    .hero { padding: 100px 0 40px; }
    .hero-title { font-size: 56px; }
    .btn { width: 100%; justify-content: center; }
    .feature-grid { grid-template-columns: 1fr; }
    .highlight-list { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .preview-tab { padding: 8px 20px; font-size: 14px; }
    .footer-links { flex-wrap: wrap; justify-content: center; }
    .preview-controls { justify-content: center; }
    .device-toggle { display: flex; }
    .compare-row.active { flex-direction: column; align-items: center; gap: 24px; }
    .compare-item.phone-item, .compare-item.pad-item { flex: 1 1 auto; max-width: 100%; width: 100%; }
    .preview[data-device="phone"] .pad-item { display: none; }
    .preview[data-device="pad"] .phone-item { display: none; }
}
@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero-title { font-size: 44px; }
    .highlight-list { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr; }
    .preview-tabs { gap: 8px; }
    .preview-tab { padding: 8px 16px; font-size: 13px; }
    .modal-header { padding: 24px 20px 16px; }
    .modal-options { padding: 16px 16px 20px; }
}