/* ==========================================
   CRITICAL CSS - Above-the-Fold Only
   Loaded inline in <head> for instant render
   ========================================== */

/* Essential Design Tokens */
:root {
    --color-primary: #6366f1;
    --color-success: #10b981;
    --color-danger: #ef4444;
    --color-warning: #f59e0b;
    --color-info: #06b6d4;

    --bg-primary: #0a0e27;
    --bg-secondary: #131729;
    --bg-glass: rgba(255, 255, 255, 0.05);

    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;

    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-blur: blur(10px);

    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;

    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.15);

    --duration-base: 250ms;
    --ease-out: cubic-bezier(0, 0, 0.2, 1);

    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-medium: 500;
    --font-semibold: 600;
}

/* Global Layout */
body {
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    background-attachment: fixed;
    color: var(--text-primary);
    font-family: var(--font-primary);
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    margin: 0;
}

main {
    flex: 1;
}

/* Navigation - Critical */
.navbar {
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.glass-navbar {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
}

.glass-dropdown {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
}

/* Glass Effect - Critical */
.glass {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
}

/* Cards - Above Fold */
.card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-md);
}

/* Buttons - Critical */
.btn {
    border-radius: var(--radius-md);
    font-weight: var(--font-medium);
    padding: var(--space-sm) var(--space-lg);
    transition: all var(--duration-base) var(--ease-out);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, #4f46e5 100%);
    border: none;
    color: white;
}

/* Typography - Critical */
.fw-medium { font-weight: var(--font-medium); }
.fw-semibold { font-weight: var(--font-semibold); }

.text-primary-custom { color: var(--text-primary); }
.text-secondary-custom { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }

/* Spacing - Critical */
.p-md { padding: var(--space-md); }
.p-lg { padding: var(--space-lg); }
.p-xl { padding: var(--space-xl); }

/* Flexbox - Critical */
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }

/* Credits Badge - Above Fold */
.credits-badge {
    background: var(--glass-bg);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--glass-border);
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
}

/* Hide non-critical content until JS loads */
[data-lazy-load] {
    opacity: 0;
    transition: opacity 0.3s ease-in;
}

[data-lazy-load].loaded {
    opacity: 1;
}