/* ==========================================================================
   LLM Wikipedia Web App - UI Stylesheet (Inspired by GH-Rank)
   Themes: Warm Autumn | Serene Forest | Cyber Dark | Elegant Modern
   ========================================================================== */

:root,
[data-theme="cyber-dark"] {
    --bg-primary: #0a0e17;
    --bg-secondary: #131c2e;
    --bg-card: #182238;
    --bg-card-hover: #1f2b45;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --accent: #38bdf8;
    --accent-hover: #0ea5e9;
    --accent-soft: rgba(56, 189, 248, 0.12);
    --border: #243452;
    --tag-bg: #0c4a6e;
    --tag-text: #7dd3fc;
    --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
    --shadow-hover: 0 18px 40px -10px rgba(56, 189, 248, 0.25);
}

[data-theme="warm-autumn"] {
    --bg-primary: #fcf9f2;
    --bg-secondary: #f4eee0;
    --bg-card: #ffffff;
    --bg-card-hover: #fffdfa;
    --text-main: #2d261e;
    --text-muted: #7d7265;
    --accent: #d97706;
    --accent-hover: #b45309;
    --accent-soft: rgba(217, 119, 6, 0.12);
    --border: #e6ddce;
    --tag-bg: #fef3c7;
    --tag-text: #92400e;
    --shadow-card: 0 10px 30px -10px rgba(45, 38, 30, 0.08);
    --shadow-hover: 0 18px 36px -12px rgba(217, 119, 6, 0.18);
}

[data-theme="serene-forest"] {
    --bg-primary: #f2f7f4;
    --bg-secondary: #e2ede6;
    --bg-card: #ffffff;
    --bg-card-hover: #f9fbf9;
    --text-main: #1b2e23;
    --text-muted: #5d7567;
    --accent: #059669;
    --accent-hover: #047857;
    --accent-soft: rgba(5, 150, 105, 0.12);
    --border: #cfe0d5;
    --tag-bg: #d1fae5;
    --tag-text: #065f46;
    --shadow-card: 0 10px 30px -10px rgba(27, 46, 35, 0.07);
    --shadow-hover: 0 18px 36px -12px rgba(5, 150, 105, 0.16);
}

[data-theme="elegant-modern"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-card: #ffffff;
    --bg-card-hover: #fcfdfe;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --accent: #4f46e5;
    --accent-hover: #4338ca;
    --accent-soft: rgba(79, 70, 229, 0.12);
    --border: #e2e8f0;
    --tag-bg: #e0e7ff;
    --tag-text: #3730a3;
    --shadow-card: 0 10px 30px -10px rgba(15, 23, 42, 0.06);
    --shadow-hover: 0 18px 36px -12px rgba(79, 70, 229, 0.18);
}

body {
    background-color: var(--bg-primary);
    color: var(--text-main);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", sans-serif;
    transition: background-color 0.25s ease, color 0.25s ease;
    padding-bottom: 5rem; /* space for bottom nav bar */
}

/* Header Glassmorphism */
.glass-header {
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(12px);
}

/* Card Styling */
.wiki-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 1.25rem;
    box-shadow: var(--shadow-card);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    cursor: pointer;
}
.wiki-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    border-color: var(--accent);
}

/* Nav Pills */
.nav-pill {
    background-color: var(--bg-secondary);
    color: var(--text-muted);
    border: 1px solid var(--border);
    border-radius: 9999px;
    padding: 0.35rem 0.9rem;
    font-size: 0.825rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}
.nav-pill:hover {
    color: var(--text-main);
    border-color: var(--accent);
}
.nav-pill.active {
    background-color: var(--accent);
    color: #ffffff;
    border-color: var(--accent);
}

/* Tag Badges */
.tag-badge {
    background-color: var(--tag-bg);
    color: var(--tag-text);
    padding: 0.2rem 0.55rem;
    border-radius: 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

/* Bottom Navigation Bar (Home, Categories, Profile) */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4.25rem;
    background-color: var(--bg-card);
    border-top: 1px solid var(--border);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.08);
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 40;
    backdrop-filter: blur(16px);
}
.bottom-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: color 0.2s ease, transform 0.15s ease;
    width: 33.33%;
    height: 100%;
}
.bottom-nav-item:hover {
    color: var(--accent);
}
.bottom-nav-item.active {
    color: var(--accent);
}
.bottom-nav-item i {
    font-size: 1.5rem;
    margin-bottom: 0.15rem;
}

/* Reader Modal Content Styling */
.reader-modal {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    z-index: 50;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}
.reader-modal.open {
    opacity: 1;
    pointer-events: auto;
}
.reader-content {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 1.5rem;
    max-width: 52rem;
    width: 100%;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.35);
}
.reader-body {
    overflow-y: auto;
    padding: 1.5rem 2rem;
    line-height: 1.8;
}
.reader-body h1 {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--text-main);
    border-bottom: 2px solid var(--border);
    padding-bottom: 0.5rem;
}
.reader-body h2 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-main);
}
.reader-body h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-top: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--accent);
}
.reader-body p {
    margin-bottom: 1rem;
    color: var(--text-main);
}
.reader-body ul, .reader-body ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}
.reader-body li {
    margin-bottom: 0.35rem;
}
.reader-body code {
    background-color: var(--bg-secondary);
    padding: 0.2rem 0.4rem;
    border-radius: 0.375rem;
    font-family: monospace;
    font-size: 0.85em;
    color: var(--accent);
}
.reader-body pre {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    padding: 1rem;
    border-radius: 0.75rem;
    overflow-x: auto;
    margin-bottom: 1.25rem;
}
.reader-body pre code {
    background: none;
    padding: 0;
    color: var(--text-main);
}
.reader-body table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.5rem;
}
.reader-body th, .reader-body td {
    border: 1px solid var(--border);
    padding: 0.6rem 0.9rem;
    text-align: left;
    font-size: 0.875rem;
}
.reader-body th {
    background-color: var(--bg-secondary);
    font-weight: 700;
}
.reader-body a {
    color: var(--accent);
    text-decoration: underline;
    font-weight: 600;
}

/* Wikilinks badge style */
.reader-body a[href^="#/article/"] {
    text-decoration: none;
    background-color: var(--accent-soft);
    padding: 0.15rem 0.45rem;
    border-radius: 0.375rem;
    border: 1px solid var(--accent);
    transition: all 0.15s ease;
}
.reader-body a[href^="#/article/"]:hover {
    background-color: var(--accent);
    color: #ffffff;
}