/* Modern Dual-Theme Design System for Data Analysis (dataanalysis.live) */

:root {
    /* Default: Light Theme */
    --bg-base: #f8fafc;
    --bg-mesh-1: rgba(37, 99, 235, 0.07);
    --bg-mesh-2: rgba(124, 58, 237, 0.05);
    
    --panel-bg: rgba(255, 255, 255, 0.92);
    --panel-border: rgba(226, 232, 240, 0.85);
    --panel-shadow: 0 10px 30px -5px rgba(15, 23, 42, 0.06), 0 4px 12px -2px rgba(15, 23, 42, 0.03);
    
    --card-surface: #ffffff;
    --card-border: #e2e8f0;
    --card-shadow: 0 12px 32px -4px rgba(15, 23, 42, 0.08), 0 4px 12px -2px rgba(15, 23, 42, 0.04);
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    
    --brand-primary: #1f5ae6;
    --brand-primary-hover: #1948bf;
    --brand-gradient: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);
    --brand-glow: rgba(37, 99, 235, 0.25);
    
    --accent-green: #10b981;
    --accent-orange: #f97316;
    --accent-purple: #8b5cf6;
    --accent-sky: #0ea5e9;

    --input-bg: #ffffff;
    --input-border: #cbd5e1;
    --input-text: #0f172a;

    --table-header-bg: #f1f5f9;
    --table-row-hover: #f8fafc;
    --table-border: #e2e8f0;
}

html[data-theme="dark"] {
    /* Dark Theme */
    --bg-base: #020617;
    --bg-mesh-1: rgba(37, 99, 235, 0.18);
    --bg-mesh-2: rgba(124, 58, 237, 0.15);
    
    --panel-bg: rgba(15, 23, 42, 0.88);
    --panel-border: rgba(51, 65, 85, 0.65);
    --panel-shadow: 0 20px 48px rgba(2, 6, 23, 0.55);
    
    --card-surface: rgba(15, 23, 42, 0.95);
    --card-border: rgba(51, 65, 85, 0.7);
    --card-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    --brand-primary: #3b82f6;
    --brand-primary-hover: #60a5fa;
    --brand-gradient: linear-gradient(135deg, #3b82f6 0%, #6366f1 100%);
    --brand-glow: rgba(59, 130, 246, 0.35);

    --input-bg: rgba(15, 23, 42, 0.9);
    --input-border: rgba(51, 65, 85, 0.8);
    --input-text: #f8fafc;

    --table-header-bg: rgba(30, 41, 59, 0.8);
    --table-row-hover: rgba(30, 41, 59, 0.5);
    --table-border: #334155;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Inter", system-ui, -apple-system, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-base);
    background-image: 
        radial-gradient(circle at top left, var(--bg-mesh-1), transparent 35%),
        radial-gradient(circle at top right, var(--bg-mesh-2), transparent 30%);
    background-attachment: fixed;
    line-height: 1.5;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.shell {
    width: min(1400px, calc(100% - 32px));
    margin: 0 auto;
    padding: 32px 0 56px;
}

/* Hero Section */
.hero {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 24px;
    align-items: stretch;
    margin-bottom: 28px;
}

.hero--home {
    grid-template-columns: minmax(0, 1fr) 320px;
}

.eyebrow {
    margin: 0 0 10px;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--brand-primary);
    font-size: 0.8rem;
    font-weight: 700;
}

h1 {
    margin: 0;
    font-size: clamp(2.1rem, 4.2vw, 3.5rem);
    line-height: 1.1;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.subtitle {
    max-width: 900px;
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.7;
    margin-top: 14px;
}

/* Glassmorphic Panels & Cards */
.hero-card,
.panel,
.kpi-card,
.chart-panel,
.table-panel,
.insight-panel {
    border: 1px solid var(--panel-border);
    background: var(--panel-bg);
    backdrop-filter: blur(16px);
    border-radius: 20px;
    box-shadow: var(--panel-shadow);
    transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.panel {
    padding: 24px;
}

.hero-card {
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 10px;
}

.hero-card span,
.kpi-card p,
label span,
.empty-state {
    color: var(--text-muted);
}

.hero-card strong {
    font-size: 2.8rem;
    line-height: 1;
    font-weight: 800;
    color: var(--text-primary);
}

.hero-card small {
    color: var(--text-secondary);
    font-size: 0.88rem;
}

/* Controls & Filters */
.filters-form {
    display: flex;
    gap: 16px;
    align-items: flex-end;
    flex-wrap: wrap;
}

label {
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-width: 220px;
    flex: 1 1 220px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}

select,
select,
input[type="text"],
.input-field {
    border-radius: 12px;
    border: 1px solid var(--input-border);
    background: var(--input-bg);
    color: var(--input-text);
    padding: 12px 16px;
    font: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

select:focus,
input[type="text"]:focus {
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 3px var(--brand-glow);
}

.btn-primary,
.hero-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    border: 0;
    background: var(--brand-gradient);
    color: #ffffff !important;
    padding: 12px 20px;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    box-shadow: 0 8px 20px var(--brand-glow);
    transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

.btn-primary:hover,
.hero-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px var(--brand-glow);
    filter: brightness(1.05);
}

.ghost-button {
    background: transparent;
    border: 1px solid var(--input-border);
    color: var(--text-primary);
}

.ghost-button:hover {
    border-color: var(--brand-primary);
    color: var(--brand-primary);
}

/* Home Grid & Navigation Cards */
.home-card-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    margin-top: 24px;
}

.home-nav-card {
    display: flex;
    flex-direction: column;
    min-height: 230px;
    padding: 24px;
    border-radius: 20px;
    border: 1px solid var(--card-border);
    background: var(--card-surface);
    box-shadow: var(--card-shadow);
    transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.home-nav-card:hover {
    transform: translateY(-5px);
    border-color: var(--brand-primary);
    box-shadow: var(--card-shadow), 0 0 20px var(--brand-glow);
}

.home-card-kicker {
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--brand-primary);
    font-size: 0.78rem;
    font-weight: 700;
}

.home-nav-card h3 {
    margin: 12px 0 8px;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
}

.home-nav-card p {
    color: var(--text-secondary);
    line-height: 1.65;
    margin: 0;
    font-size: 0.95rem;
}

.home-card-link {
    margin-top: auto;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--brand-primary);
    text-decoration: none;
    font-weight: 700;
    padding-top: 16px;
}

.home-card-link:hover {
    text-decoration: underline;
}

/* KPI Grid */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
    margin-top: 24px;
}

.kpi-card {
    padding: 20px 22px;
}

.kpi-card span {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-muted);
}

.kpi-card h2 {
    margin: 10px 0 6px;
    font-size: 2.1rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.kpi-card p {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Charts */
.chart-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    margin-top: 24px;
}

.chart {
    min-height: 380px;
    position: relative;
}

.chart canvas {
    width: 100% !important;
    height: 100% !important;
}

/* Focus Cards */
.focus-card-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.focus-card {
    position: relative;
    border-radius: 18px;
    padding: 20px;
    background: var(--card-surface);
    border: 1px solid var(--card-border);
    box-shadow: var(--card-shadow);
    overflow: hidden;
}

.focus-card::before {
    content: "";
    position: absolute;
    inset: 0 auto 0 0;
    width: 5px;
    background: var(--focus-color, var(--brand-primary));
}

.focus-card__top h3 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.focus-card__metric strong {
    font-size: 2.1rem;
    font-weight: 800;
    color: var(--text-primary);
}

/* Tables */
.table-wrap {
    overflow-x: auto;
    border-radius: 14px;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--table-border);
    font-size: 0.95rem;
}

th {
    background: var(--table-header-bg);
    color: var(--text-secondary);
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 700;
}

tr:hover td {
    background: var(--table-row-hover);
}

/* Badges & Tags */
.tag {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--brand-primary);
    padding: 6px 14px;
    border-radius: 999px;
    background: rgba(37, 99, 235, 0.12);
    border: 1px solid rgba(37, 99, 235, 0.25);
    white-space: nowrap;
}

/* Responsive Media Queries */
@media (max-width: 1100px) {
    .hero,
    .kpi-grid,
    .focus-card-grid,
    .home-card-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 720px) {
    .shell {
        width: min(100% - 24px, 1400px);
        padding-top: 20px;
    }

    .hero,
    .kpi-grid,
    .focus-card-grid,
    .home-card-grid {
        grid-template-columns: 1fr;
    }

    .panel,
    .hero-card {
        padding: 18px;
    }

    h1 {
        font-size: 2.1rem;
    }

    .hero-card strong {
        font-size: 2.4rem;
    }
}