/* Qrater — Interactive Quantum News Dashboard */

:root {
    --bg: #0f172a;
    --bg-card: #1e293b;
    --bg-hover: #334155;
    --border: #334155;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --primary: #6366f1;
    --primary-light: #818cf8;
    --secondary: #06b6d4;
    --accent: #8b5cf6;

    --topic-hardware: #f59e0b;
    --topic-algorithms: #8b5cf6;
    --topic-error-correction: #ef4444;
    --topic-error_correction: #ef4444;
    --topic-cryptography: #14b8a6;
    --topic-machine-learning: #ec4899;
    --topic-machine_learning: #ec4899;
    --topic-simulation: #3b82f6;
    --topic-sensing: #10b981;
    --topic-industry: #f97316;
    --topic-research: #6366f1;
    --topic-policy: #64748b;
    --topic-general: #94a3b8;

    --radius: 8px;
    --radius-sm: 4px;
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --sidebar-width: 280px;
    --header-height: 56px;
}

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

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

/* === HEADER === */
.qrater-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
    height: var(--header-height);
}

.header-inner {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.qrater-logo {
    font-size: 1.5rem;
    font-weight: 800;
    text-decoration: none;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.header-nav a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.2s;
}

.header-nav a:hover { color: var(--text); }

.filter-toggle {
    display: none;
    align-items: center;
    gap: var(--space-xs);
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.875rem;
}

/* === APP LAYOUT === */
.qrater-app {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    min-height: calc(100vh - var(--header-height));
}

/* === FILTERS SIDEBAR === */
.filters-panel {
    background: var(--bg-card);
    border-right: 1px solid var(--border);
    padding: var(--space-lg);
    position: sticky;
    top: var(--header-height);
    height: calc(100vh - var(--header-height));
    overflow-y: auto;
}

.filter-group {
    margin-bottom: var(--space-lg);
}

.filter-group h3 {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
}

.topic-checkboxes {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.topic-check {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
    padding: var(--space-xs) 0;
    font-size: 0.875rem;
}

.topic-check input[type="checkbox"] {
    accent-color: var(--primary);
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.topic-label { flex: 1; }
.topic-count {
    font-size: 0.75rem;
    color: var(--text-muted);
    background: var(--bg);
    padding: 1px 6px;
    border-radius: 10px;
}

/* Topic color indicators */
.topic-color-hardware { color: var(--topic-hardware); }
.topic-color-algorithms { color: var(--topic-algorithms); }
.topic-color-error_correction { color: var(--topic-error_correction); }
.topic-color-cryptography { color: var(--topic-cryptography); }
.topic-color-machine_learning { color: var(--topic-machine_learning); }
.topic-color-simulation { color: var(--topic-simulation); }
.topic-color-sensing { color: var(--topic-sensing); }
.topic-color-industry { color: var(--topic-industry); }
.topic-color-research { color: var(--topic-research); }
.topic-color-policy { color: var(--topic-policy); }
.topic-color-general { color: var(--topic-general); }

.topic-actions {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-sm);
}

.btn-sm {
    font-size: 0.75rem;
    padding: var(--space-xs) var(--space-sm);
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s;
}

.btn-sm:hover {
    background: var(--bg-hover);
    color: var(--text);
}

/* Date range */
.date-presets {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xs);
    margin-bottom: var(--space-sm);
}

.preset-btn {
    font-size: 0.8rem;
    padding: var(--space-sm);
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s;
}

.preset-btn:hover { background: var(--bg-hover); color: var(--text); }
.preset-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.custom-dates {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.custom-dates label {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.custom-dates input[type="date"] {
    flex: 1;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
}

/* Select dropdowns */
.filter-group select {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    cursor: pointer;
}

/* === MAIN CONTENT === */
.main-content {
    padding: var(--space-lg);
    max-width: 1200px;
}

.results-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
    font-size: 0.875rem;
}

#results-count { font-weight: 600; }
.build-time { color: var(--text-muted); }

/* === ARTICLE GRID === */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-lg);
}

.qrater-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: transform 0.2s, border-color 0.2s;
}

.qrater-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
}

.card-image {
    height: 180px;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.qrater-card:hover .card-image img {
    transform: scale(1.05);
}

.card-body {
    padding: var(--space-md);
}

.card-topics {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-sm);
}

.topic-tag {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    padding: 2px 8px;
    border-radius: 10px;
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary-light);
}

/* Per-topic tag colors */
.topic-tag.t-hardware { background: rgba(245, 158, 11, 0.15); color: var(--topic-hardware); }
.topic-tag.t-algorithms { background: rgba(139, 92, 246, 0.15); color: var(--topic-algorithms); }
.topic-tag.t-error_correction { background: rgba(239, 68, 68, 0.15); color: var(--topic-error_correction); }
.topic-tag.t-cryptography { background: rgba(20, 184, 166, 0.15); color: var(--topic-cryptography); }
.topic-tag.t-machine_learning { background: rgba(236, 72, 153, 0.15); color: var(--topic-machine_learning); }
.topic-tag.t-simulation { background: rgba(59, 130, 246, 0.15); color: var(--topic-simulation); }
.topic-tag.t-sensing { background: rgba(16, 185, 129, 0.15); color: var(--topic-sensing); }
.topic-tag.t-industry { background: rgba(249, 115, 22, 0.15); color: var(--topic-industry); }
.topic-tag.t-research { background: rgba(99, 102, 241, 0.15); color: var(--topic-research); }
.topic-tag.t-policy { background: rgba(100, 116, 139, 0.15); color: var(--topic-policy); }
.topic-tag.t-general { background: rgba(148, 163, 184, 0.15); color: var(--topic-general); }

.card-title {
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: var(--space-sm);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-title a {
    color: var(--text);
    text-decoration: none;
}

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

.card-summary {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: var(--space-sm);
}

.card-commentary {
    font-size: 0.8rem;
    color: var(--secondary);
    font-style: italic;
    border-left: 2px solid var(--secondary);
    padding-left: var(--space-sm);
    margin: var(--space-sm) 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-meta {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--space-sm);
    padding-top: var(--space-sm);
    border-top: 1px solid var(--border);
}

.card-source { font-weight: 500; }
.card-date { flex: 1; }

.relevance-badge {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 10px;
    background: rgba(99, 102, 241, 0.2);
    color: var(--primary-light);
}

.no-results {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--space-xl) * 2;
    color: var(--text-muted);
    font-size: 1.1rem;
}

.loading-msg {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--space-xl);
    color: var(--text-muted);
}

/* === EMAIL SIGNUP === */
.email-signup {
    margin-top: var(--space-xl);
    padding: var(--space-xl);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(6, 182, 212, 0.1));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-align: center;
}

.email-signup h2 {
    font-size: 1.3rem;
    margin-bottom: var(--space-sm);
    background: linear-gradient(135deg, var(--primary-light), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.email-signup p {
    color: var(--text-muted);
    margin-bottom: var(--space-lg);
    font-size: 0.9rem;
}

.signup-topics {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.signup-topic-check {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.85rem;
    padding: var(--space-xs) var(--space-sm);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: border-color 0.2s;
}

.signup-topic-check:hover { border-color: var(--primary); }

.signup-topic-check input { accent-color: var(--primary); cursor: pointer; }

.signup-row {
    display: flex;
    max-width: 420px;
    margin: 0 auto;
    gap: var(--space-sm);
}

.signup-row input[type="email"] {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: var(--radius);
    font-size: 0.9rem;
}

.signup-row button {
    padding: var(--space-sm) var(--space-lg);
    background: var(--primary);
    border: none;
    color: white;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.signup-row button:hover { background: var(--accent); }

/* === FOOTER === */
.qrater-footer {
    border-top: 1px solid var(--border);
    padding: var(--space-lg);
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.qrater-footer a {
    color: var(--primary-light);
    text-decoration: none;
}

.qrater-footer a:hover { text-decoration: underline; }

.footer-note {
    font-size: 0.75rem;
    margin-top: var(--space-xs);
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .filter-toggle { display: flex; }

    .qrater-app {
        grid-template-columns: 1fr;
    }

    .filters-panel {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        height: calc(100vh - var(--header-height));
        z-index: 50;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }

    .filters-panel.open {
        transform: translateX(0);
    }

    .main-content { padding: var(--space-md); }

    .articles-grid {
        grid-template-columns: 1fr;
    }

    .results-bar {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-xs);
    }

    .signup-row {
        flex-direction: column;
    }

    .card-image { height: 140px; }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .articles-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}