:root {
    --bg: #0a0a0f;
    --bg-card: #12121a;
    --bg-card-hover: #1a1a26;
    --bg-elevated: #1e1e2e;
    --border: #2a2a3a;
    --text: #e8e8f0;
    --text-muted: #8888a0;
    --accent: #00d4ff;
    --accent-glow: rgba(0, 212, 255, 0.25);
    --accent2: #7c3aed;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --radius: 12px;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --font: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: #66e5ff; }

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

/* Header */
.site-header {
    position: sticky; top: 0; z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}
.header-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 64px;
}
.logo { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; font-size: 1.2rem; }
.logo-icon { color: var(--accent); font-size: 1.4rem; }
.logo-accent { color: var(--accent); margin-left: 2px; }
.nav-links { display: flex; align-items: center; gap: 16px; }
.nav-badge {
    font-size: .85rem; color: var(--text-muted);
    background: var(--bg-elevated); padding: 4px 12px; border-radius: 20px;
    border: 1px solid var(--border);
}

/* Buttons */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 10px 20px; border-radius: 8px; border: none;
    font-size: .95rem; font-weight: 600; cursor: pointer;
    transition: all .2s; font-family: inherit;
}
.btn-primary {
    background: linear-gradient(135deg, var(--accent), #0099cc);
    color: #000; box-shadow: 0 4px 16px var(--accent-glow);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 24px var(--accent-glow); color: #000; }
.btn-accent { background: linear-gradient(135deg, var(--accent2), #5b21b6); color: #fff; }
.btn-ghost { background: transparent; color: var(--text-muted); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { padding: 6px 14px; font-size: .85rem; }
.btn-xs { padding: 4px 10px; font-size: .78rem; }
.btn-lg { padding: 14px 32px; font-size: 1.05rem; }
.btn-block { width: 100%; }
.btn-disabled { background: var(--bg-elevated); color: var(--text-muted); cursor: not-allowed; pointer-events: none; }

/* Hero Search */
.hero-search {
    position: relative; padding: 80px 0 60px; text-align: center; overflow: hidden;
}
.hero-glow {
    position: absolute; top: -100px; left: 50%; transform: translateX(-50%);
    width: 600px; height: 400px;
    background: radial-gradient(ellipse, var(--accent-glow) 0%, transparent 70%);
    pointer-events: none;
}
.hero-badge {
    display: inline-block; padding: 6px 18px; border-radius: 20px;
    background: rgba(0, 212, 255, 0.1); border: 1px solid rgba(0, 212, 255, 0.3);
    color: var(--accent); font-size: .9rem; font-weight: 600; margin-bottom: 20px;
}
.hero-title {
    font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 800;
    background: linear-gradient(135deg, #fff 0%, var(--accent) 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    margin-bottom: 16px; line-height: 1.3;
}
.hero-desc { color: var(--text-muted); font-size: 1.05rem; max-width: 640px; margin: 0 auto 40px; }

.search-box-wrap { max-width: 720px; margin: 0 auto; position: relative; }
.search-form { position: relative; }
.search-input-group {
    display: flex; align-items: center;
    background: var(--bg-card); border: 2px solid var(--border);
    border-radius: 16px; padding: 6px 6px 6px 20px;
    transition: border-color .2s, box-shadow .2s;
}
.search-input-group:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-glow);
}
.search-icon { width: 22px; height: 22px; color: var(--text-muted); flex-shrink: 0; }
.search-input-group input {
    flex: 1; background: none; border: none; outline: none;
    color: var(--text); font-size: 1.05rem; padding: 14px 16px; font-family: inherit;
}
.search-input-group input::placeholder { color: #55556a; }
.search-btn { border-radius: 12px !important; white-space: nowrap; }

.suggest-dropdown {
    display: none; position: absolute; top: calc(100% + 8px); left: 0; right: 0;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); box-shadow: var(--shadow); z-index: 50;
    max-height: 320px; overflow-y: auto;
}
.suggest-dropdown.show { display: block; }
.suggest-item {
    display: flex; align-items: center; justify-content: space-between;
    padding: 12px 18px; cursor: pointer; transition: background .15s;
    border-bottom: 1px solid var(--border);
}
.suggest-item:last-child { border-bottom: none; }
.suggest-item:hover, .suggest-item.active { background: var(--bg-elevated); }
.suggest-item-name { font-weight: 600; }
.suggest-item-meta { font-size: .82rem; color: var(--text-muted); }

.hot-tags { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 20px; justify-content: center; }
.hot-tags-label { color: var(--text-muted); font-size: .85rem; margin-right: 4px; }
.hot-tag {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 6px 14px; border-radius: 20px;
    background: var(--bg-card); border: 1px solid var(--border);
    color: var(--text); font-size: .85rem; transition: all .2s;
}
.hot-tag:hover { border-color: var(--accent); background: var(--bg-elevated); color: var(--accent); }
.hot-tag em { font-style: normal; font-size: .75rem; padding: 1px 6px; border-radius: 4px; }

/* Heat labels */
.heat-blast { color: #ff4757; background: rgba(255,71,87,.15); }
.heat-high { color: #ffa502; background: rgba(255,165,2,.15); }
.heat-hot { color: var(--accent); background: rgba(0,212,255,.12); }
.heat-rise { color: var(--success); background: rgba(16,185,129,.12); }
.heat-pill { padding: 4px 12px; border-radius: 20px; font-size: .85rem; font-style: normal; }

/* Sections */
.section { padding: 60px 0; }
.section-dark { background: linear-gradient(180deg, var(--bg) 0%, #0d0d18 50%, var(--bg) 100%); }
.section-head { text-align: center; margin-bottom: 40px; }
.section-head h2 { font-size: 1.8rem; margin-bottom: 8px; }
.section-head p { color: var(--text-muted); }

/* Card grids */
.card-grid { display: grid; gap: 20px; }
.card-grid-3 { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.card-grid-4 { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }

.feature-card, .disease-card, .dept-card, .content-card, .stat-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 24px;
    transition: transform .2s, border-color .2s, box-shadow .2s;
}
.feature-card:hover, .disease-card:hover { transform: translateY(-4px); border-color: rgba(0,212,255,.3); box-shadow: var(--shadow); }
.feature-icon { font-size: 2rem; margin-bottom: 12px; }
.feature-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.feature-card p { color: var(--text-muted); font-size: .9rem; }

.disease-card { display: block; color: var(--text); position: relative; }
.disease-rank { position: absolute; top: 16px; right: 16px; font-size: .85rem; color: var(--text-muted); font-weight: 700; }
.disease-name { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; }
.disease-meta { display: flex; gap: 10px; align-items: center; font-size: .85rem; margin-bottom: 8px; }
.disease-meta span:first-child { padding: 2px 8px; border-radius: 4px; }
.disease-dept { color: var(--text-muted); font-size: .82rem; }
.quick-search { color: var(--accent); font-size: .85rem; margin-top: 8px; }

.dept-card.unlocked { border-color: rgba(16,185,129,.4); }
.dept-card-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.progress-bar { height: 6px; background: var(--bg-elevated); border-radius: 3px; margin: 12px 0 6px; overflow: hidden; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent2)); border-radius: 3px; transition: width .4s; }
.progress-text { font-size: .82rem; color: var(--text-muted); }

.badge { display: inline-block; padding: 3px 10px; border-radius: 12px; font-size: .78rem; font-weight: 600; }
.badge-success { background: rgba(16,185,129,.15); color: var(--success); }
.badge-lock { background: rgba(136,136,160,.15); color: var(--text-muted); }

/* Search result page */
.page-main { padding: 32px 0 60px; }
.search-mini { margin-bottom: 32px; }
.search-form-inline { display: flex; gap: 10px; max-width: 480px; }
.search-form-inline input {
    flex: 1; background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 8px; padding: 10px 16px; color: var(--text); outline: none; font-family: inherit;
}
.search-form-inline input:focus { border-color: var(--accent); }

.result-header { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 28px; }
.result-header h1 { font-size: 2rem; }
.result-dept { color: var(--text-muted); background: var(--bg-elevated); padding: 4px 12px; border-radius: 8px; font-size: .9rem; }

.result-stats { margin-bottom: 28px; }
.stat-card { text-align: center; padding: 20px; }
.stat-label { color: var(--text-muted); font-size: .85rem; margin-bottom: 6px; }
.stat-value { font-size: 1.6rem; font-weight: 800; }
.stat-value.accent { color: var(--accent); }
.trend-up { color: var(--success); }

.result-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 20px; margin-bottom: 24px; }
.content-card-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.content-card-head h2 { font-size: 1.1rem; }

.copy-list { list-style: none; }
.copy-list li {
    display: flex; align-items: flex-start; justify-content: space-between; gap: 12px;
    padding: 12px 0; border-bottom: 1px solid var(--border); font-size: .95rem;
}
.copy-list li:last-child { border-bottom: none; }
.copy-list li.empty { color: var(--text-muted); justify-content: center; }
.copy-btn {
    flex-shrink: 0; background: var(--bg-elevated); border: 1px solid var(--border);
    color: var(--accent); padding: 4px 12px; border-radius: 6px; cursor: pointer;
    font-size: .78rem; font-family: inherit; transition: all .15s;
}
.copy-btn:hover { background: var(--accent); color: #000; border-color: var(--accent); }
.copy-btn.copied { background: var(--success); color: #fff; border-color: var(--success); }

.download-card { margin-bottom: 20px; }
.download-card.locked { opacity: .7; }
.download-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.download-inner h2 { font-size: 1.2rem; margin-bottom: 6px; }
.download-inner p { color: var(--text-muted); font-size: .9rem; }
.file-meta { display: inline-block; margin-top: 8px; font-size: .82rem; color: var(--text-muted); }

.no-result { text-align: center; padding: 40px 0; }
.no-result-icon { font-size: 3rem; margin-bottom: 16px; }
.no-result h1 { font-size: 1.5rem; margin-bottom: 8px; }
.no-result p { color: var(--text-muted); margin-bottom: 32px; }
.hot-push { border-style: dashed; }

/* Login */
.login-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; position: relative; }
.login-bg {
    position: fixed; inset: 0;
    background: radial-gradient(ellipse at 30% 20%, rgba(0,212,255,.08) 0%, transparent 50%),
                radial-gradient(ellipse at 70% 80%, rgba(124,58,237,.08) 0%, transparent 50%);
}
.login-wrap { position: relative; z-index: 1; width: 100%; max-width: 420px; padding: 24px; }
.login-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 16px; padding: 40px 36px; box-shadow: var(--shadow);
}
.login-logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.1rem; margin-bottom: 24px; color: var(--accent); }
.login-card h1 { font-size: 1.6rem; margin-bottom: 6px; }
.login-sub { color: var(--text-muted); font-size: .9rem; margin-bottom: 28px; }
.login-form .form-group { margin-bottom: 18px; }
.login-form label { display: block; font-size: .85rem; color: var(--text-muted); margin-bottom: 6px; }
.login-form input, .form-group input, .form-group select {
    width: 100%; background: var(--bg-elevated); border: 1px solid var(--border);
    border-radius: 8px; padding: 12px 14px; color: var(--text);
    font-size: .95rem; outline: none; font-family: inherit;
}
.login-form input:focus, .form-group input:focus { border-color: var(--accent); }
.login-footer { text-align: center; margin-top: 20px; }
.login-footer a { color: var(--text-muted); font-size: .85rem; }

.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-size: .9rem; }
.alert-error { background: rgba(239,68,68,.12); border: 1px solid rgba(239,68,68,.3); color: #fca5a5; }
.alert-success { background: rgba(16,185,129,.12); border: 1px solid rgba(16,185,129,.3); color: #6ee7b7; }

/* Footer */
.site-footer {
    border-top: 1px solid var(--border); padding: 24px 0;
    text-align: center; color: var(--text-muted); font-size: .85rem;
}

/* Toast */
.toast {
    position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(80px);
    background: var(--bg-elevated); border: 1px solid var(--success); color: var(--success);
    padding: 10px 24px; border-radius: 8px; font-size: .9rem; z-index: 999;
    transition: transform .3s; pointer-events: none;
}
.toast.show { transform: translateX(-50%) translateY(0); }

@media (max-width: 768px) {
    .hero-search { padding: 48px 0 40px; }
    .search-input-group { flex-wrap: wrap; padding: 12px; }
    .search-btn { width: 100%; margin-top: 8px; }
    .card-grid-4 { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
    .result-grid { grid-template-columns: 1fr; }
    .download-inner { flex-direction: column; text-align: center; }
}