@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=Playfair+Display:ital,wght@0,400;0,600;1,400&display=swap');

:root {
    --bg-color: #07080c;
    --sidebar-bg: rgba(10, 12, 22, 0.55);
    --card-bg: rgba(16, 20, 35, 0.45);
    --card-hover-bg: rgba(22, 26, 45, 0.6);
    --border-color: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.15);
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    /* Linguistic Dialect Color Palette */
    --accent-quenya: #f1c40f;      /* Vanyarin / Laurelin Gold for Quenya */
    --accent-sindarin: #10b981;    /* Emerald Forest / Telperion Silver-green for Sindarin */
    --accent-primitive: #bfdbfe;   /* Pale Celestial Blue for Primitive Elvish roots */
    --accent-general: #60a5fa;     /* Classic Noldorin blue for general stats */
    --accent-gnomish: #f43f5e;     /* Vibrant pinkish red for early-period Gnomish */
    --accent-noldorin: #fb923c;    /* Warm orange for middle-period Noldorin */
    --accent-purple: #a78bfa;      /* Amethyst for phonetic sound laws */
    --accent-orange: #f97316;      /* Ochre for external volatile revisions */
    
    --font-sans: 'Outfit', sans-serif;
    --font-serif: 'Playfair Display', serif;
    --glass-blur: blur(20px);
    --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --shadow-premium: 0 10px 40px 0 rgba(0, 0, 0, 0.5);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-sans);
    background-image: 
        radial-gradient(at 15% 15%, rgba(124, 58, 237, 0.12) 0px, transparent 45%),
        radial-gradient(at 85% 85%, rgba(16, 185, 129, 0.1) 0px, transparent 45%),
        radial-gradient(at 50% 50%, rgba(241, 196, 15, 0.04) 0px, transparent 60%);
    background-attachment: fixed;
    min-height: 100vh;
    display: flex;
    overflow-x: hidden;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.2);
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Glassmorphism Utility */
.glass {
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: var(--shadow-premium);
    transition: var(--transition-smooth);
}

.glass-interactive:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
    background: var(--card-hover-bg);
    box-shadow: 0 15px 45px 0 rgba(0, 0, 0, 0.65), 0 0 15px 0 rgba(255, 255, 255, 0.03);
}

/* Layout Architecture */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 280px;
    background: var(--sidebar-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-right: 1px solid var(--border-color);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    z-index: 1000;
}

.main-content {
    margin-left: 280px;
    padding: 2.5rem 3rem;
    width: calc(100% - 280px);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Sidebar Styling */
.brand {
    display: flex;
    flex-direction: column;
    margin-bottom: 2.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.5rem;
}

.brand h1 {
    font-family: var(--font-serif);
    font-size: 1.7rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    background: linear-gradient(135deg, #ffffff, #cbd5e1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-top: 0.25rem;
}

.nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item a {
    display: flex;
    align-items: center;
    padding: 0.8rem 1.1rem;
    border-radius: 12px;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition-smooth);
    border: 1px solid transparent;
}

.nav-item a svg {
    margin-right: 0.8rem;
    width: 18px;
    height: 18px;
    transition: var(--transition-smooth);
}

.nav-item a:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.04);
}

.nav-item.active a {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 20px 0 rgba(0, 0, 0, 0.15);
}

.sidebar-footer {
    margin-top: auto;
    font-size: 0.75rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
    line-height: 1.4;
}

/* Page Header */
.page-header {
    margin-bottom: 2.5rem;
}

.page-header h2 {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 600;
    background: linear-gradient(to right, #ffffff, #9ca3af);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

/* Grid Layouts */
.metrics-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.metric-card {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
}

.metric-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.5rem;
}

.metric-value {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: #ffffff;
}

.metric-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* Linguistic Codex (Expandable Pedagogy Drawer) */
.codex-card {
    padding: 2rem;
    margin-bottom: 2.5rem;
    position: relative;
    overflow: hidden;
}

.codex-card h3 {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    margin-bottom: 0.8rem;
    color: #ffffff;
    display: flex;
    align-items: center;
}

.codex-card h3 svg {
    margin-right: 0.6rem;
    color: var(--accent-quenya);
}

.codex-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.95rem;
}

.codex-content {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
}

.codex-content h4 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #ffffff;
    margin-top: 0.5rem;
}

.codex-content ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.codex-content li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding-left: 1.2rem;
    position: relative;
}

.codex-content li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent-quenya);
    font-weight: bold;
}

/* Charts Grid */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

@media (max-width: 1024px) {
    .charts-grid {
        grid-template-columns: 1fr;
    }
}

.chart-card {
    padding: 2rem;
    display: flex;
    flex-direction: column;
}

.chart-card h3 {
    font-size: 1.2rem;
    margin-bottom: 1.2rem;
    color: #ffffff;
    font-weight: 600;
}

.chart-viewport {
    position: relative;
    width: 100%;
    height: 380px;
    background: rgba(0, 0, 0, 0.15);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.02);
    overflow: hidden;
}

/* Control Panels (Sliders, Buttons, Searches) */
.control-panel {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.5rem;
    align-items: center;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.control-group label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    font-weight: 600;
}

.slider-wrapper {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.slider-wrapper span {
    font-size: 0.85rem;
    font-weight: 600;
    min-width: 35px;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 160px;
    height: 6px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.1);
    outline: none;
    transition: var(--transition-smooth);
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-general);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(96, 165, 250, 0.5);
    transition: var(--transition-smooth);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.search-input-wrapper input {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem 1rem 0.5rem 2.2rem;
    color: #ffffff;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    outline: none;
    transition: var(--transition-smooth);
    width: 220px;
}

.search-input-wrapper input:focus {
    border-color: var(--accent-general);
    box-shadow: 0 0 15px rgba(96, 165, 250, 0.15);
    width: 280px;
}

.search-input-wrapper svg {
    position: absolute;
    left: 0.8rem;
    width: 15px;
    height: 15px;
    color: var(--text-secondary);
}

.btn-pill {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1.1rem;
    border-radius: 30px;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-pill:hover, .btn-pill.active {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-pill.active {
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.05);
}

/* Tooltip standard */
.chart-tooltip {
    position: absolute;
    background: rgba(10, 11, 20, 0.85);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    pointer-events: none;
    font-size: 0.85rem;
    box-shadow: var(--shadow-premium);
    color: var(--text-primary);
    z-index: 2000;
    opacity: 0;
    transition: opacity 0.2s ease, transform 0.2s ease;
    max-width: 250px;
}

.chart-tooltip h4 {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

/* Responsive collapse of sidebar */
@media (max-width: 768px) {
    body {
        flex-direction: column;
    }
    .sidebar {
        position: relative;
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 1.5rem;
    }
    .main-content {
        margin-left: 0;
        width: 100%;
        padding: 1.5rem;
    }
}