/* Modern Dark Theme Variables - StrainEffects.co.uk Clinical Theme */
:root {
    /* Base Backgrounds - Slate */
    --bg-primary: #0b1120; /* Darker, deeper slate */
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    
    /* Text */
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    /* Brand Colors - Clinical Science */
    --accent: #0ea5e9; /* Sky 500 - Primary Brand Blue */
    --accent-hover: #0284c7;
    --accent-subtle: rgba(14, 165, 233, 0.1);
    
    /* Data/Sentiment Colors */
    --success: #10b981; /* Emerald 500 - Positive/High Score */
    --success-bg: rgba(16, 185, 129, 0.1);
    --warning: #f59e0b; /* Amber 500 - Mixed/Medium Score */
    --warning-bg: rgba(245, 158, 11, 0.1);
    --danger: #ef4444; /* Red 500 - Negative/Low Score */
    --danger-bg: rgba(239, 68, 68, 0.1);
    
    /* UI Elements */
    --nav-bg: rgba(11, 17, 32, 0.85); /* Glass effect base */
    --card-bg: #1e293b;
    --card-border: #334155;
    --card-border-hover: #475569;
    
    /* Fonts */
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Menlo', 'Monaco', 'Courier New', monospace;
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Typography Utilities */
h1, h2, h3, h4, h5, h6 {
    letter-spacing: -0.025em;
    font-weight: 700;
}

.font-mono {
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation - Glassmorphism */
nav {
    background: var(--nav-bg);
    border-bottom: 1px solid var(--card-border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.nav-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.05em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo::before {
    content: '';
    display: block;
    width: 12px;
    height: 12px;
    background: var(--accent);
    border-radius: 2px;
    box-shadow: 0 0 10px var(--accent);
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 2rem;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s;
}

.nav-links a:hover {
    color: var(--accent);
}

.nav-links a.active {
    color: var(--text-primary);
    position: relative;
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -22px; /* Align with nav border */
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--accent);
}

/* Hero Section */
.hero {
    padding: 4rem 0;
    text-align: center;
}

/* Grid System */
.grid {
    display: grid;
    gap: 1.5rem;
    margin: 2rem 0;
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

/* Cards - Technical Look */
.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px; /* Sharper corners */
    padding: 1.5rem;
    transition: all 0.2s ease;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.card:hover {
    transform: translateY(-2px);
    border-color: var(--card-border-hover);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0.5rem 0;
    letter-spacing: -0.05em;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 600;
}

/* Buttons & Interactions */
.btn-toggle {
    background: transparent;
    border: 1px solid var(--card-border);
    color: var(--text-secondary);
    padding: 0.4rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.85rem;
    transition: all 0.2s;
    font-family: var(--font-main);
}

.btn-toggle:hover {
    border-color: var(--text-secondary);
    color: var(--text-primary);
}

.btn-toggle.active {
    background: var(--accent-subtle);
    border-color: var(--accent);
    color: var(--accent);
}

/* Data Tables */
table {
    width: 100%;
    border-collapse: collapse;
}

th {
    text-align: left;
    padding: 1rem;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--card-border);
    font-weight: 600;
}

td {
    padding: 1rem;
    border-bottom: 1px solid rgba(51, 65, 85, 0.5);
    font-size: 0.95rem;
}

tr:last-child td {
    border-bottom: none;
}

/* Utilities & Colors */
.text-center { text-align: center; }
.mb-4 { margin-bottom: 2rem; }

/* Branding Text */
.text-accent { color: var(--accent); }
.text-accent-hover:hover { color: var(--accent-hover); }

/* Semantic Data Colors */
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }
.text-muted { color: var(--text-muted); }

.tag {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.6rem;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
    border: 1px solid rgba(255,255,255,0.05);
    font-family: var(--font-mono);
}

/* Verified Checkmark */
.verified-icon {
    color: var(--accent);
    font-size: 0.9rem;
}

/* Search Bar Override */
input[type="text"] {
    background: var(--bg-secondary) !important;
    border-color: var(--card-border) !important;
    color: var(--text-primary) !important;
    font-family: var(--font-main);
}
input[type="text"]:focus {
    border-color: var(--accent) !important;
    box-shadow: 0 0 0 3px var(--accent-subtle) !important;
}

/* Footer */
footer {
    border-top: 1px solid var(--card-border);
    padding: 3rem 0;
    margin-top: 4rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}