* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background: #0b0e11; color: #eaecef; transition: background 0.3s, color 0.3s; min-height: 100vh; }
body.light-mode { background: #f5f5f5; color: #1e2329; }
a { color: #f0b90b; text-decoration: none; }
a:hover { color: #f8d12f; }
.navbar { display: flex; justify-content: space-between; align-items: center; padding: 1rem 2rem; background: #1e2329; position: sticky; top: 0; z-index: 1000; }
body.light-mode .navbar { background: #ffffff; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.nav-brand { font-size: 1.5rem; font-weight: 700; color: #f0b90b; }
.nav-links { display: flex; list-style: none; gap: 1.5rem; align-items: center; }
.nav-links li a { padding: 0.5rem 0; transition: color 0.2s; }
.theme-btn { background: none; border: 1px solid #f0b90b; color: #f0b90b; padding: 0.3rem 0.8rem; border-radius: 20px; cursor: pointer; font-size: 1rem; }
.nav-toggle { display: none; font-size: 1.8rem; cursor: pointer; color: #f0b90b; }
.hero { text-align: center; padding: 4rem 2rem; background: linear-gradient(135deg, #1e2329 0%, #2b3137 100%); }
body.light-mode .hero { background: linear-gradient(135deg, #ffffff, #f0f2f5); }
.hero h1 { font-size: 2.5rem; margin-bottom: 1rem; }
.hero p { font-size: 1.2rem; color: #aaa; }
.search-filter { display: flex; gap: 1rem; padding: 1.5rem 2rem; flex-wrap: wrap; align-items: center; justify-content: center; }
.search-filter input, .search-filter select { padding: 0.8rem 1rem; border-radius: 8px; border: 1px solid #333; background: #1e2329; color: #eaecef; font-size: 1rem; }
body.light-mode .search-filter input, body.light-mode .search-filter select { background: #fff; color: #1e2329; border-color: #ccc; }
.market-overview { padding: 2rem; }
.market-overview h2 { margin-bottom: 1.5rem; font-size: 1.8rem; }
.coin-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1.5rem; }
.coin-card { background: #1e2329; border-radius: 16px; padding: 1.5rem; box-shadow: 0 4px 12px rgba(0,0,0,0.3); transition: transform 0.2s, box-shadow 0.2s; border: 1px solid #2b3137; }
body.light-mode .coin-card { background: #fff; border-color: #e0e0e0; }
.coin-card:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(0,0,0,0.4); }
.coin-header { display: flex; justify-content: space-between; margin-bottom: 0.8rem; }
.coin-name { font-weight: 600; font-size: 1.1rem; }
.coin-symbol { color: #888; font-size: 0.9rem; }
.coin-price { font-size: 1.6rem; font-weight: 700; margin: 0.5rem 0; }
.coin-change { font-size: 1.1rem; font-weight: 600; }
.positive { color: #0ecb81; }
.negative { color: #f6465d; }
.coin-volume { color: #888; font-size: 0.85rem; margin-top: 0.5rem; }
.add-watchlist { background: #f0b90b; color: #1e2329; border: none; padding: 0.5rem 1rem; border-radius: 8px; cursor: pointer; font-weight: 600; margin-top: 1rem; width: 100%; transition: background 0.2s; }
.add-watchlist:hover { background: #f8d12f; }
.hot-ranking { padding: 2rem; }
.ranking-tabs { display: flex; gap: 0.5rem; margin-bottom: 1.5rem; }
.ranking-tab { background: #1e2329; border: 1px solid #2b3137; color: #eaecef; padding: 0.6rem 1.2rem; border-radius: 8px; cursor: pointer; }
body.light-mode .ranking-tab { background: #fff; border-color: #ccc; color: #1e2329; }
.ranking-tab.active { background: #f0b90b; color: #1e2329; border-color: #f0b90b; }
.ranking-content table { width: 100%; border-collapse: collapse; background: #1e2329; border-radius: 12px; overflow: hidden; }
body.light-mode .ranking-content table { background: #fff; }
.ranking-content th, .ranking-content td { padding: 1rem; text-align: left; border-bottom: 1px solid #2b3137; }
body.light-mode .ranking-content th, body.light-mode .ranking-content td { border-color: #e0e0e0; }
.ranking-content th { background: #2b3137; font-weight: 600; }
body.light-mode .ranking-content th { background: #f0f2f5; }
footer { text-align: center; padding: 2rem; background: #1e2329; margin-top: 2rem; }
body.light-mode footer { background: #fff; }
footer p { color: #888; font-size: 0.9rem; }
.footer-links a { margin: 0 0.5rem; }
.login-form { max-width: 400px; margin: 5rem auto; padding: 2rem; background: #1e2329; border-radius: 16px; }
body.light-mode .login-form { background: #fff; }
.login-form input { width: 100%; padding: 0.8rem; margin: 0.5rem 0; border-radius: 8px; border: 1px solid #333; background: #2b3137; color: #eaecef; }
body.light-mode .login-form input { background: #f5f5f5; color: #1e2329; border-color: #ccc; }
.login-form button { width: 100%; padding: 0.8rem; background: #f0b90b; color: #1e2329; border: none; border-radius: 8px; font-weight: 600; cursor: pointer; }
.admin-panel { padding: 2rem; max-width: 1200px; margin: 0 auto; }
.admin-coin-entry, .admin-news-entry { display: flex; gap: 0.5rem; flex-wrap: wrap; margin: 0.5rem 0; align-items: center; }
.admin-coin-entry input, .admin-news-entry input { padding: 0.5rem; border-radius: 6px; border: 1px solid #333; background: #2b3137; color: #eaecef; flex: 1; min-width: 80px; }
body.light-mode .admin-coin-entry input, body.light-mode .admin-news-entry input { background: #f5f5f5; color: #1e2329; border-color: #ccc; }
.admin-coin-entry select { padding: 0.5rem; border-radius: 6px; border: 1px solid #333; background: #2b3137; color: #eaecef; }
body.light-mode .admin-coin-entry select { background: #f5f5f5; color: #1e2329; border-color: #ccc; }
.remove-coin, .remove-news { background: #f6465d; color: #fff; border: none; padding: 0.5rem 1rem; border-radius: 6px; cursor: pointer; }
#addCoin, #addNews, #saveAllData { margin: 0.5rem; padding: 0.7rem 1.5rem; background: #f0b90b; color: #1e2329; border: none; border-radius: 8px; cursor: pointer; font-weight: 600; }
.error { color: #f6465d; }
@media (max-width: 768px) {
    .nav-links { display: none; flex-direction: column; width: 100%; background: #1e2329; position: absolute; top: 60px; left: 0; padding: 1rem; }
    body.light-mode .nav-links { background: #fff; }
    .nav-links.active { display: flex; }
    .nav-toggle { display: block; }
    .hero h1 { font-size: 1.8rem; }
    .coin-grid { grid-template-columns: 1fr; }
    .search-filter { flex-direction: column; }
    .admin-coin-entry, .admin-news-entry { flex-direction: column; }
}