/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #ec4899;
    --bg: #0f172a;
    --bg-card: #1e293b;
    --bg-hover: #334155;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --text-secondary: #cbd5e1;
    --border: #334155;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
    --gradient-1: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
    --gradient-2: linear-gradient(135deg, #3b82f6 0%, #06b6d4 100%);
    --radius: 16px;
    --radius-sm: 8px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 24px;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 32px;
    padding: 24px;
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-1);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.logo-text h1 {
    font-size: 24px;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text p {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
    letter-spacing: 0.5px;
}

.stats {
    display: flex;
    gap: 32px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 32px;
    font-weight: 700;
    background: var(--gradient-2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.update-time {
    text-align: right;
}

.update-label {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.update-value {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Controls */
.controls {
    margin-bottom: 24px;
}

.search-box {
    position: relative;
    margin-bottom: 16px;
}

.search-box input {
    width: 100%;
    padding: 16px 20px 16px 52px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 15px;
    transition: all 0.3s ease;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-icon {
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: var(--text-muted);
}

.filter-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tag {
    padding: 8px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tag:hover {
    border-color: var(--primary-light);
    color: var(--text);
}

.tag.active {
    background: var(--gradient-1);
    border-color: transparent;
    color: white;
}

/* Waterfall Layout */
.waterfall-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.waterfall-column {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* News Cards */
.news-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
    break-inside: avoid;
}

.news-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.news-header {
    padding: 20px 20px 16px;
    border-bottom: 1px solid var(--border);
}

.news-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.news-source {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary-light);
    font-size: 12px;
    font-weight: 600;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.news-time {
    font-size: 13px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}

.news-title {
    font-size: 17px;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 10px;
}

.news-title a {
    color: var(--text);
    text-decoration: none;
    transition: color 0.3s ease;
}

.news-title a:hover {
    color: var(--primary-light);
}

.news-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--primary-light);
    text-decoration: none;
    transition: all 0.3s ease;
}

.news-link:hover {
    color: var(--primary);
    gap: 10px;
}

.news-link svg {
    width: 12px;
    height: 12px;
}

/* News Body */
.news-body {
    padding: 16px 20px 20px;
}

.news-summary {
    background: rgba(15, 23, 42, 0.5);
    border-left: 3px solid var(--primary);
    padding: 14px 16px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: 16px;
}

.news-summary-label {
    font-size: 10px;
    color: var(--primary-light);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 6px;
    font-weight: 600;
}

.news-summary p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Topics Section */
.topics-section {
    margin-top: 16px;
}

.topics-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}

.topics-header svg {
    width: 16px;
    height: 16px;
    color: var(--secondary);
}

.topics-header h3 {
    font-size: 12px;
    color: var(--secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.topics-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.topic-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 14px;
    transition: all 0.3s ease;
}

.topic-item:hover {
    background: rgba(99, 102, 241, 0.08);
    border-color: rgba(99, 102, 241, 0.3);
}

.topic-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 8px;
}

.topic-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    line-height: 1.4;
    flex: 1;
}

.topic-tag {
    flex-shrink: 0;
    padding: 2px 8px;
    background: rgba(236, 72, 153, 0.15);
    color: var(--secondary);
    font-size: 10px;
    font-weight: 600;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.topic-direction {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 10px;
    line-height: 1.5;
}

.copy-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-muted);
    font-size: 11px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.copy-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.copy-btn svg {
    width: 12px;
    height: 12px;
}

.copy-btn.copied {
    background: #10b981;
    border-color: #10b981;
    color: white;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.empty-state p {
    font-size: 16px;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #10b981;
    color: white;
    padding: 14px 24px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    box-shadow: 0 10px 25px rgba(16, 185, 129, 0.3);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast-icon {
    width: 20px;
    height: 20px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
}

/* Responsive */
@media (max-width: 900px) {
    .waterfall-container {
        grid-template-columns: 1fr;
    }
    
    .header {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

    .stats {
        gap: 24px;
    }

    .update-time {
        text-align: center;
    }
}

@media (max-width: 768px) {
    .stat-number {
        font-size: 28px;
    }

    .news-title {
        font-size: 16px;
    }

    .topic-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.news-card {
    animation: fadeIn 0.4s ease forwards;
}