/* ============================================
   ANALEMMA AI - CSS Variables & Theme
   Deep Tech Dark Theme (Single Mode)
   ============================================ */

:root {
    /* ===== BACKGROUNDS ===== */
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --bg-card: rgba(17, 17, 17, 0.8);
    --bg-glass: rgba(10, 10, 10, 0.85);
    
    /* ===== TEXT COLORS ===== */
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    
    /* ===== ACCENT COLORS ===== */
    --accent-primary: #2563eb;
    --accent-secondary: #3b82f6;
    --accent-tertiary: #06b6d4;
    --accent-hover: #1d4ed8;
    
    /* ===== GRADIENTS ===== */
    --gradient-primary: linear-gradient(135deg, #2563eb, #06b6d4);
    --gradient-text: linear-gradient(135deg, #3b82f6, #06b6d4, #2563eb);
    --gradient-glow: linear-gradient(135deg, rgba(37, 99, 235, 0.4), rgba(6, 182, 212, 0.4));
    
    /* ===== BORDERS & SHADOWS ===== */
    --border-color: rgba(63, 63, 70, 0.5);
    --border-light: rgba(255, 255, 255, 0.1);
    --glow-primary: rgba(37, 99, 235, 0.5);
    --glow-secondary: rgba(6, 182, 212, 0.3);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
    --shadow-elevated: 0 20px 60px rgba(0, 0, 0, 0.5);
    
    /* ===== GLASSMORPHISM ===== */
    --glass-bg: rgba(17, 17, 17, 0.7);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-blur: 20px;
    
    /* ===== TYPOGRAPHY ===== */
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* ===== SPACING ===== */
    --section-padding: 6rem;
    --container-max: 1280px;
    
    /* ===== TRANSITIONS ===== */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* ===== Z-INDEX LAYERS ===== */
    --z-background: -1;
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 500;
    --z-modal: 1000;
    --z-toast: 1100;
    --z-chat: 1200;
}

/* ===== BASE RESETS ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ===== TYPOGRAPHY HIERARCHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

h1 { font-size: clamp(2.5rem, 6vw, 5rem); font-weight: 800; }
h2 { font-size: clamp(2.5rem, 5vw, 4rem); font-weight: 800; letter-spacing: -0.03em; }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2vw, 1.5rem); }

p {
    font-family: var(--font-body);
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== GRADIENT TEXT ===== */
.gradient-text {
    background: var(--gradient-text);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: gradientShift 4s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

/* ===== CONTAINER ===== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

@media (min-width: 768px) {
    .container {
        padding: 0 2rem;
    }
}

/* ===== SELECTION ===== */
::selection {
    background: var(--accent-primary);
    color: var(--text-primary);
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-secondary);
}