/* Awesome AgenticRAG - Main Styles */

:root {
    --color-primary: #1a365d;
    --color-secondary: #2c5282;
    --color-accent: #3182ce;
    --color-text: #1a202c;
    --color-text-light: #4a5568;
    --color-text-muted: #718096;
    --color-bg: #ffffff;
    --color-bg-light: #f7fafc;
    --color-border: #e2e8f0;
    --color-code-bg: #edf2f7;
    --color-success: #38a169;
    --color-warning: #d69e2e;
    --color-purple: #805ad5;
    --font-serif: 'Source Serif 4', 'Noto Serif SC', Georgia, serif;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(49, 130, 206, 0.1);
}

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

body {
    font-family: var(--font-serif);
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text);
    background: var(--color-bg);
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Header ===== */
.site-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: white;
    padding: 48px 0 32px;
    text-align: center;
}

.site-title {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
}

.site-subtitle {
    font-size: 1.05rem;
    opacity: 0.9;
    font-weight: 400;
    margin-bottom: 20px;
}

.header-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.nav-link {
    color: rgba(255,255,255,0.85);
    text-decoration: none;
    font-size: 0.85rem;
    font-family: var(--font-sans);
    padding: 6px 16px;
    border-radius: 20px;
    transition: all 0.2s ease;
}

.nav-link:hover { background: rgba(255,255,255,0.15); color: white; }

.nav-link.active {
    background: rgba(255,255,255,0.2);
    color: white;
}

.github-link {
    color: white;
    text-decoration: none;
    font-size: 0.85rem;
    font-family: var(--font-sans);
    padding: 6px 16px;
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 20px;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.github-link:hover { background: rgba(255,255,255,0.15); border-color: rgba(255,255,255,0.5); }
.github-link svg { fill: currentColor; }

/* ===== Stats Dashboard ===== */
.stats-dashboard {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 16px;
    text-align: center;
}

.stat-card .stat-value {
    font-family: var(--font-sans);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.2;
}

.stat-card .stat-label {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 4px;
}

/* ===== Search Bar ===== */
.search-bar {
    position: relative;
    margin-bottom: 20px;
}

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

.search-bar input {
    width: 100%;
    padding: 12px 16px 12px 44px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.search-bar input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(49,130,206,0.1);
}

.search-count {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--font-sans);
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* ===== Tag Filters ===== */
.tag-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 20px;
}

.tag-section-label {
    font-family: var(--font-sans);
    font-size: 0.7rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-right: 4px;
    align-self: center;
}

.tag-chip {
    display: inline-block;
    padding: 4px 12px;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    user-select: none;
}

/* Method tags */
.tag-chip[data-cat="method"] {
    background: #ebf8ff;
    color: #2b6cb0;
}
.tag-chip[data-cat="method"].active { background: #2b6cb0; color: white; }

/* Task tags */
.tag-chip[data-cat="task"] {
    background: #fefcbf;
    color: #975a16;
}
.tag-chip[data-cat="task"].active { background: #975a16; color: white; }

/* Feature tags */
.tag-chip[data-cat="feature"] {
    background: #f0fff4;
    color: #276749;
}
.tag-chip[data-cat="feature"].active { background: #276749; color: white; }

.tag-chip:hover { opacity: 0.85; }

/* ===== Stats Bar ===== */
.stats-bar {
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: 24px;
}

/* ===== Timeline ===== */
.timeline { position: relative; }

.year-group { margin-bottom: 40px; }

.year-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.year-label {
    font-family: var(--font-sans);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-primary);
}

.year-count {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    color: var(--color-text-light);
    background: var(--color-bg-light);
    padding: 4px 12px;
    border-radius: 12px;
}

.year-line {
    flex: 1;
    height: 1px;
    background: var(--color-border);
}

/* ===== Month Sub-header ===== */
.month-header {
    font-family: var(--font-sans);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-secondary);
    margin: 20px 0 12px;
}

/* ===== Paper Card ===== */
.paper-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 20px 24px;
    margin-bottom: 12px;
    transition: all 0.2s ease;
    opacity: 0;
    transform: translateY(16px);
}

.paper-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.paper-card:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-md);
}

.paper-header {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.paper-date {
    font-family: var(--font-sans);
    font-size: 0.72rem;
    color: var(--color-accent);
    background: rgba(49,130,206,0.1);
    padding: 3px 10px;
    border-radius: 12px;
    white-space: nowrap;
    flex-shrink: 0;
    font-weight: 600;
}

.paper-title {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    font-weight: 600;
    line-height: 1.4;
}

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

.paper-title a:hover {
    color: var(--color-accent);
    text-decoration: underline;
}

.paper-abstract {
    margin-top: 10px;
    font-size: 0.88rem;
    color: var(--color-text-light);
    line-height: 1.7;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
}

.paper-abstract.expanded {
    -webkit-line-clamp: unset;
}

.paper-abstract::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1.5em;
    background: linear-gradient(transparent, var(--color-bg));
    pointer-events: none;
    transition: opacity 0.3s;
}

.paper-abstract.expanded::after,
.paper-abstract:hover::after {
    opacity: 0;
}

/* Card tags */
.paper-tags {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
    margin: 10px 0;
}

.paper-tag {
    font-family: var(--font-sans);
    font-size: 0.65rem;
    padding: 2px 8px;
    border-radius: 8px;
    background: var(--color-bg-light);
    color: var(--color-text-muted);
}

.paper-tag.tag-method { background: #ebf8ff; color: #2b6cb0; }
.paper-tag.tag-task { background: #fefcbf; color: #975a16; }
.paper-tag.tag-feature { background: #f0fff4; color: #276749; }

/* Paper links */
.paper-links {
    display: flex;
    gap: 8px;
    margin-top: 8px;
    flex-wrap: wrap;
}

.paper-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-light);
    background: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 4px 12px;
    text-decoration: none;
    transition: all 0.15s;
}

.paper-link-btn:hover {
    background: var(--color-code-bg);
    color: var(--color-primary);
    border-color: var(--color-accent);
}

.paper-link-btn.code-btn {
    color: var(--color-accent);
    background: #ebf5fb;
}

.paper-link-btn.code-btn:hover {
    background: #dbeafe;
}

.paper-link-btn.dataset-btn {
    color: var(--color-warning);
    background: #fefcbf;
}

.paper-link-btn.dataset-btn:hover {
    background: #fef3a0;
}

/* ===== Footer ===== */
.site-footer {
    background: var(--color-bg-light);
    padding: 24px 0;
    text-align: center;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--color-text-light);
    border-top: 1px solid var(--color-border);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .stats-dashboard {
        grid-template-columns: repeat(2, 1fr);
    }
    .site-title { font-size: 2rem; }
    .header-nav { gap: 4px; }
    .nav-link { padding: 5px 10px; font-size: 0.8rem; }
    .paper-card { padding: 16px; }
    .paper-header { flex-direction: column; gap: 6px; }
    .year-label { font-size: 1.25rem; }
}

@media (max-width: 480px) {
    .stats-dashboard { grid-template-columns: repeat(2, 1fr); gap: 8px; }
    .stat-card .stat-value { font-size: 1.4rem; }
    .container { padding: 0 16px; }
    .site-header { padding: 32px 0 24px; }
    .site-title { font-size: 1.6rem; }
    .github-link span { display: none; }
    .tag-filters { gap: 4px; }
}

/* ===== Utility ===== */
.hidden { display: none !important; }

/* ===== Scroll animation ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}