/* ============================================
   Articles Page Styles
   Altbridge AI - Research Library
   ============================================ */

/* Hero Section */
.articles-hero {
    padding: 140px 0 60px;
    text-align: center;
}

.articles-hero-content {
    max-width: 600px;
    margin: 0 auto;
}

.articles-hero h1 {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-muted);
    margin-bottom: 32px;
}

/* Search Container */
.search-container {
    position: relative;
    max-width: 400px;
    margin: 0 auto;
}

.search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 14px 16px 14px 48px;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    color: var(--text-primary);
    transition: all 0.3s ease;
    box-shadow:
        inset 0 1px 0 0 var(--edge-light-top),
        inset 0 -1px 0 0 var(--edge-light-bottom),
        var(--glass-shadow);
}

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

.search-input:focus {
    outline: none;
    border-color: var(--accent-cyan);
    background: var(--glass-bg-hover);
}

/* Filters Section */
.filters-section {
    padding: 0 0 32px;
    position: sticky;
    top: 80px;
    z-index: 50;
    background: linear-gradient(to bottom, var(--bg-warm) 0%, transparent 100%);
    transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Hide on scroll down, show on scroll up (mobile only) */
@media (max-width: 768px) {
    .filters-section.hidden {
        transform: translateY(-120%);
        opacity: 0;
        pointer-events: none;
    }
}

.filters-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.filter-buttons {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 4px;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.filter-buttons::-webkit-scrollbar {
    display: none;
}

.filter-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.3s ease;
    box-shadow:
        inset 0 1px 0 0 var(--edge-light-top),
        inset 0 -1px 0 0 var(--edge-light-bottom);
}

.filter-btn:hover {
    background: var(--glass-bg-hover);
    border-color: var(--glass-border-hover);
}

.filter-btn.active {
    background: rgba(8, 145, 178, 0.15);
    border-color: rgba(8, 145, 178, 0.4);
    color: var(--accent-cyan);
}

.filter-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
    background: rgba(0, 0, 0, 0.06);
    border-radius: 10px;
    font-size: 0.75rem;
    font-weight: 600;
}

.filter-btn.active .filter-count {
    background: rgba(8, 145, 178, 0.2);
}

/* Sort Dropdown */
.sort-container {
    flex-shrink: 0;
}

.sort-select {
    padding: 10px 32px 10px 12px;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    box-shadow:
        inset 0 1px 0 0 var(--edge-light-top),
        inset 0 -1px 0 0 var(--edge-light-bottom);
}

.sort-select:focus {
    outline: none;
    border-color: var(--accent-cyan);
}

/* Articles Section */
.articles-section {
    padding: 0 0 60px;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

/* Article Card */
.article-card {
    position: relative;
    display: flex;
    flex-direction: column;
    padding: 18px;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: inherit;
    transition: all 0.4s var(--spring-smooth);
    box-shadow:
        inset 0 1px 0 0 var(--edge-light-top),
        inset 0 -1px 0 0 var(--edge-light-bottom),
        var(--glass-shadow);
    overflow: hidden;
}

.article-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(
        600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
        rgba(255, 255, 255, 0.6),
        transparent 40%
    );
    border-radius: inherit;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 1;
}

.article-card:hover::before {
    opacity: 1;
}

.article-card:hover {
    transform: translateY(-4px);
    border-color: var(--glass-border-hover);
    background: var(--glass-bg-hover);
    box-shadow:
        inset 0 1px 0 0 rgba(255, 255, 255, 1),
        inset 0 -1px 0 0 var(--edge-light-bottom),
        0 16px 48px rgba(0, 0, 0, 0.12);
}

/* Article Header */
.article-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 10px;
    gap: 8px;
}

.article-category {
    display: inline-flex;
    align-items: center;
    padding: 3px 8px;
    background: rgba(8, 145, 178, 0.1);
    border: 1px solid rgba(8, 145, 178, 0.2);
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-cyan);
}

.category-china {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.2);
    color: #dc2626;
}

.category-macro {
    background: rgba(168, 85, 247, 0.1);
    border-color: rgba(168, 85, 247, 0.2);
    color: #9333ea;
}

.category-energy {
    background: rgba(234, 179, 8, 0.1);
    border-color: rgba(234, 179, 8, 0.2);
    color: #ca8a04;
}

.category-tech {
    background: rgba(34, 197, 94, 0.1);
    border-color: rgba(34, 197, 94, 0.2);
    color: #16a34a;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}

.premium-badge {
    padding: 2px 6px;
    background: rgba(168, 85, 247, 0.15);
    border: 1px solid rgba(168, 85, 247, 0.3);
    border-radius: var(--radius-sm);
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    color: #9333ea;
}

.free-badge {
    padding: 2px 6px;
    background: rgba(34, 197, 94, 0.15);
    border: 1px solid rgba(34, 197, 94, 0.3);
    border-radius: var(--radius-sm);
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    color: #16a34a;
}

.summary-badge {
    padding: 2px 6px;
    background: linear-gradient(135deg, rgba(8, 145, 178, 0.2), rgba(168, 85, 247, 0.2));
    border: 1px solid rgba(8, 145, 178, 0.3);
    border-radius: var(--radius-sm);
    font-size: 0.6rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--accent-cyan);
    letter-spacing: 0.02em;
}

.article-card.has-summary {
    border-color: rgba(8, 145, 178, 0.2);
}

.article-card.has-summary:hover {
    border-color: rgba(8, 145, 178, 0.4);
}

.read-time {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* Article Title & Hook */
.article-card .article-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
    line-height: 1.3;
    letter-spacing: -0.01em;
}

.article-hook {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.45;
    margin-bottom: 12px;
    flex-grow: 1;
}

/* Key Metric - Single highlight metric */
.key-metric {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 12px;
    padding: 6px 10px;
    background: rgba(8, 145, 178, 0.08);
    border: 1px solid rgba(8, 145, 178, 0.15);
    border-radius: var(--radius-md);
}

.key-metric-value {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--accent-cyan);
}

.key-metric-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* Article Footer */
.article-card .article-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 10px;
    border-top: 1px solid var(--glass-border);
    margin-top: auto;
}

.article-date {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.read-more {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--accent-cyan);
    transition: gap 0.3s ease;
}

.article-card:hover .read-more {
    gap: 10px;
}

/* Load More */
.load-more-container {
    display: flex;
    justify-content: center;
    margin-top: 48px;
}

.btn-load-more {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow:
        inset 0 1px 0 0 var(--edge-light-top),
        inset 0 -1px 0 0 var(--edge-light-bottom),
        var(--glass-shadow);
}

.btn-load-more:hover {
    background: var(--glass-bg-hover);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

/* No Results */
.no-results {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    text-align: center;
    color: var(--text-muted);
}

.no-results svg {
    margin-bottom: 16px;
    opacity: 0.5;
}

.no-results h3 {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.no-results p {
    font-size: 0.9375rem;
}

/* Subscribe Section */
.subscribe-section {
    padding: 60px 0;
}

/* ============================================
   Responsive Styles
   ============================================ */

@media (max-width: 1024px) {
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
}

@media (max-width: 768px) {
    .articles-hero {
        padding: 120px 0 40px;
    }

    .articles-hero h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .filters-section {
        top: 70px;
        padding: 16px 0;
    }

    .filters-wrapper {
        flex-direction: column;
        gap: 12px;
    }

    .filter-buttons {
        width: 100%;
        justify-content: flex-start;
        padding-bottom: 8px;
    }

    .sort-container {
        width: 100%;
    }

    .sort-select {
        width: 100%;
    }

    .articles-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .article-card {
        padding: 20px;
    }

    .article-header {
        flex-wrap: wrap;
    }

    .subscribe-section {
        padding: 40px 0;
    }
}

@media (max-width: 480px) {
    /* Hide Research Library label */
    .articles-hero .section-label {
        display: none;
    }

    .articles-hero {
        padding: 100px 0 24px;
    }

    .articles-hero h1 {
        font-size: 1.75rem;
        margin-bottom: 8px;
    }

    .hero-subtitle {
        font-size: 0.875rem;
        margin-bottom: 20px;
    }

    .search-input {
        padding: 12px 12px 12px 44px;
        font-size: 0.9375rem;
    }

    /* Filter buttons with scroll indicator */
    .filter-buttons {
        position: relative;
        margin-right: -16px;
        padding-right: 24px;
        /* Fade hint for more content */
        mask-image: linear-gradient(to right, black 85%, transparent 100%);
        -webkit-mask-image: linear-gradient(to right, black 85%, transparent 100%);
    }

    .filter-btn {
        padding: 8px 12px;
        font-size: 0.8125rem;
    }

    .articles-grid {
        gap: 12px;
    }

    /* Compact article cards for mobile */
    .article-card {
        padding: 16px;
    }

    .article-header {
        margin-bottom: 10px;
        gap: 8px;
    }

    .article-category {
        padding: 3px 8px;
        font-size: 0.65rem;
    }

    .premium-badge,
    .free-badge {
        padding: 2px 6px;
        font-size: 0.6rem;
    }

    .read-time {
        font-size: 0.7rem;
    }

    .article-card .article-title {
        font-size: 1rem;
        margin-bottom: 6px;
        line-height: 1.25;
    }

    .article-hook {
        font-size: 0.8125rem;
        margin-bottom: 12px;
        line-height: 1.4;
        /* Limit to 2 lines */
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    /* Compact key metric */
    .key-metric {
        padding: 6px 10px;
        margin-bottom: 12px;
    }

    .key-metric-value {
        font-size: 1rem;
    }

    .key-metric-label {
        font-size: 0.65rem;
    }

    /* Compact footer - inline date and read more */
    .article-card .article-footer {
        padding-top: 12px;
        gap: 8px;
    }

    .article-date {
        font-size: 0.7rem;
        color: var(--text-muted);
    }

    .read-more {
        font-size: 0.8rem;
    }

    /* Separator between date and read more */
    .article-date::after {
        content: "•";
        margin-left: 8px;
        color: var(--text-muted);
        opacity: 0.5;
    }
}