:root {
    --primary: #667eea;
    --secondary: #764ba2;
    --dark: #1a1a2e;
    --shadow: 0 4px 15px rgba(0,0,0,0.1);
    --shadow-hover: 0 8px 30px rgba(0,0,0,0.2);
    --radius: 16px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, var(--dark) 0%, #16213e 50%, #0f3460 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

.loading {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: var(--dark);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s;
}
.loading.hidden { opacity: 0; pointer-events: none; }
.loading-spinner {
    width: 50px; height: 50px;
    border: 4px solid rgba(102,126,234,0.2);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.container { max-width: 1400px; margin: 0 auto; padding: 20px; }

.header {
    text-align: center;
    padding: 40px 20px 25px;
    color: #fff;
}
.header h1 {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 10px;
    background: linear-gradient(90deg, #fff, #f093fb, #fff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size: 200% auto;
    animation: shine 3s linear infinite;
}
@keyframes shine { to { background-position: 200% center; } }

.search-section {
    max-width: 700px;
    margin: 0 auto 30px;
    padding: 0 20px;
}
.search-box {
    display: flex;
    gap: 10px;
    background: rgba(255,255,255,0.1);
    padding: 8px;
    border-radius: 50px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
}
.search-input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 12px 20px;
    color: #fff;
    font-size: 16px;
    outline: none;
}
.search-input::placeholder { color: rgba(255,255,255,0.5); }
.search-btn {
    padding: 12px 30px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    border: none;
    border-radius: 30px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}
.search-btn:hover { transform: translateY(-2px); box-shadow: 0 5px 20px rgba(102,126,234,0.4); }
.search-btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.quick-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-top: 15px;
}
.quick-tag {
    padding: 6px 14px;
    background: rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.8);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 20px;
    font-size: 13px;
    cursor: pointer;
    transition: var(--transition);
}
.quick-tag:hover { background: rgba(255,255,255,0.2); color: #fff; }

.hot-section {
    background: linear-gradient(135deg, rgba(102,126,234,0.2), rgba(118,75,162,0.2));
    border-radius: 20px;
    padding: 25px;
    margin-bottom: 25px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.1);
}
.hot-title { color: #fff; font-size: 22px; font-weight: 700; margin-bottom: 20px; }
.hot-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 12px; }
.hot-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 15px;
    background: rgba(255,255,255,0.1);
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
}
.hot-item:hover { background: rgba(255,255,255,0.2); transform: translateX(5px); }
.hot-rank {
    width: 32px; height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    font-weight: 700;
    font-size: 14px;
    flex-shrink: 0;
}
.hot-rank-1 { background: linear-gradient(135deg, #ff6b6b, #ee5a5a); color: #fff; }
.hot-rank-2 { background: linear-gradient(135deg, #ffd93d, #f4c430); color: #333; }
.hot-rank-3 { background: linear-gradient(135deg, #6bcf7f, #5ab769); color: #fff; }
.hot-rank-normal { background: rgba(255,255,255,0.2); color: #fff; }
.hot-content { flex: 1; min-width: 0; }
.hot-category {
    display: inline-block;
    background: var(--primary);
    color: #fff;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    margin-bottom: 5px;
}
.hot-title-text {
    color: #fff;
    font-size: 14px;
    line-height: 1.5;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.tabs { display: flex; gap: 10px; margin-bottom: 25px; flex-wrap: wrap; justify-content: center; }
.tab-btn {
    padding: 12px 20px;
    border: none;
    border-radius: 25px;
    background: rgba(255,255,255,0.1);
    color: #fff;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}
.tab-btn:hover, .tab-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102,126,234,0.4);
}

.main-grid { display: grid; grid-template-columns: 1fr 350px; gap: 25px; margin-top: 30px; }

.news-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
.news-card {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
}
.news-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.card-content { padding: 18px; }
.news-category-tag {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 11px;
    margin-bottom: 10px;
}
.card-title {
    font-size: 16px;
    font-weight: 600;
    line-height: 1.5;
    color: #222;
    margin-bottom: 8px;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}
.card-desc {
    font-size: 13px;
    color: #666;
    line-height: 1.6;
    margin-bottom: 12px;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}
.card-meta { display: flex; justify-content: space-between; font-size: 12px; color: #999; }
.card-source { background: #f0f0f0; padding: 3px 10px; border-radius: 4px; }

.sidebar { display: flex; flex-direction: column; gap: 20px; }
.sidebar-card {
    background: rgba(255,255,255,0.95);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}
.sidebar-title { font-size: 18px; font-weight: 700; margin-bottom: 15px; }
.trending-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 0;
    border-bottom: 1px solid #f0f0f0;
    cursor: pointer;
    transition: var(--transition);
}
.trending-item:last-child { border-bottom: none; }
.trending-item:hover { color: var(--primary); }
.trending-num {
    width: 24px; height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f0f0f0;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 700;
    flex-shrink: 0;
}
.trending-item:nth-child(1) .trending-num { background: #ff6b6b; color: #fff; }
.trending-item:nth-child(2) .trending-num { background: #ffd93d; color: #333; }
.trending-item:nth-child(3) .trending-num { background: #6bcf7f; color: #fff; }
.trending-title { flex: 1; font-size: 14px; line-height: 1.4; overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.trending-heat { font-size: 12px; color: #ff6b6b; font-weight: 500; }

.category-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.category-tag {
    padding: 8px 16px;
    background: #f5f5f5;
    border-radius: 20px;
    font-size: 13px;
    cursor: pointer;
    transition: var(--transition);
}
.category-tag:hover { background: var(--primary); color: #fff; }

.footer {
    text-align: center;
    padding: 50px 20px;
    color: rgba(255,255,255,0.6);
}
.update-info {
    background: rgba(255,255,255,0.1);
    padding: 15px 30px;
    border-radius: 25px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    backdrop-filter: blur(10px);
}
.refresh-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 20px;
    padding: 14px 35px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    border: none;
    border-radius: 30px;
    cursor: pointer;
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition);
}
.refresh-btn:hover { transform: translateY(-3px); box-shadow: 0 10px 30px rgba(102,126,234,0.4); }

.back-to-top {
    position: fixed;
    bottom: 30px; right: 30px;
    width: 50px; height: 50px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 99;
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { transform: translateY(-3px); box-shadow: 0 10px 30px rgba(102,126,234,0.4); }

.search-results-section {
    display: none;
    margin-bottom: 30px;
}
.search-results-section.active { display: block; }
.search-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding: 15px 20px;
    background: rgba(255,255,255,0.1);
    border-radius: 12px;
}
.search-title { color: #fff; font-size: 18px; font-weight: 600; }
.clear-search {
    padding: 8px 16px;
    background: rgba(255,255,255,0.2);
    color: #fff;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    font-size: 13px;
    transition: var(--transition);
}
.clear-search:hover { background: rgba(255,255,255,0.3); }

.no-results {
    text-align: center;
    padding: 60px 20px;
    color: rgba(255,255,255,0.7);
}
.no-results-icon { font-size: 60px; margin-bottom: 20px; }
.no-results-text { font-size: 16px; }

@media (max-width: 1024px) {
    .main-grid { grid-template-columns: 1fr; }
    .sidebar { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
    .header h1 { font-size: 32px; }
}
@media (max-width: 600px) {
    .header h1 { font-size: 24px; }
    .header { padding: 30px 15px 20px; }
    .search-box { flex-direction: column; border-radius: 20px; }
    .search-btn { justify-content: center; }
    .news-grid { grid-template-columns: 1fr; }
    .hot-list { grid-template-columns: 1fr; }
    .tabs { justify-content: center; }
    .tab-btn { padding: 10px 15px; font-size: 13px; }
}