/* ============================================
   DealScout Design System
   Professional, AI-First Marketplace Intelligence
   ============================================ */

/* ============================================
   CSS Variables - Design Tokens
   ============================================ */
:root {
    /* ============================================
       DealFlipAI Theme Tokens (iOS-matching)
       ============================================ */

    /* iOS palette */
    --df-primary: #3B82F6;
    --df-primary-dark: #2563EB;
    --df-primary-darker: #1D4ED8;
    --df-primary-light: #60A5FA;
    --df-primary-lighter: #DBEAFE;

    --df-secondary: #06B6D4;
    --df-secondary-dark: #0891B2;
    --df-secondary-light: #22D3EE;
    --df-secondary-lighter: #CFFAFE;

    /* Premium tier colors */
    --df-purple: #8B5CF6;
    --df-purple-dark: #7C3AED;
    --df-purple-darker: #6D28D9;
    --df-purple-light: #A78BFA;
    --df-purple-lighter: #EDE9FE;

    --df-baby-blue: #60A5FA;
    --df-baby-blue-dark: #3B82F6;
    --df-baby-blue-darker: #2563EB;
    --df-baby-blue-light: #93C5FD;
    --df-baby-blue-lighter: #DBEAFE;

    --df-success: #10B981;
    --df-success-dark: #059669;
    --df-success-light: #34D399;
    --df-success-lighter: #D1FAE5;

    --df-warning: #F59E0B;
    --df-warning-dark: #D97706;
    --df-warning-light: #FBBF24;
    --df-warning-lighter: #FEF3C7;

    --df-error: #EF4444;
    --df-error-dark: #DC2626;
    --df-error-light: #F87171;
    --df-error-lighter: #FEE2E2;

    /* Light mode grays - unchanged */
    --df-gray-50: #F9FAFB;
    --df-gray-100: #F3F4F6;
    --df-gray-200: #E5E7EB;
    --df-gray-300: #D1D5DB;
    --df-gray-400: #9CA3AF;
    --df-gray-500: #6B7280;
    --df-gray-600: #4B5563;
    --df-gray-700: #374151;
    --df-gray-800: #1F2937;
    --df-gray-900: #111827;

    /* Dark mode chalk grays - warm neutral palette (no blue tint)
       Inspired by Linear, Notion, Spotify, Apple native dark modes */
    --df-dark-50: #FAFAFA;   /* Primary text on dark */
    --df-dark-100: #E5E5E5;  /* Near-white text */
    --df-dark-200: #D4D4D4;  /* Light secondary text */
    --df-dark-300: #A3A3A3;  /* Tertiary/muted text */
    --df-dark-400: #737373;  /* Secondary text/icons */
    --df-dark-500: #525252;  /* Muted text/disabled */
    --df-dark-600: #3A3A3A;  /* Subtle borders/dividers */
    --df-dark-700: #2E2E2E;  /* Elevated surfaces/borders */
    --df-dark-800: #222222;  /* Card/surface background */
    --df-dark-900: #141414;  /* Deepest background */

    /* ============================================
       PREMIUM LIGHT MODE THEME
       Modern, luxurious, and visually impactful
       Inspired by Linear, Stripe, Vercel, Apple light modes
       ============================================ */
    color-scheme: light;

    /* Background hierarchy - clean with subtle warmth */
    --df-bg: #F6F8FB;
    --df-surface: #FFFFFF;
    --df-surface-elevated: #FFFFFF;
    --df-surface-subtle: #F0F4F8;

    /* Text hierarchy - strong contrast, professional */
    --df-text: #0F172A;
    --df-text-2: #3F4F63;
    --df-text-3: #7A8AA3;
    --df-text-inverted: #FFFFFF;

    /* Border and divider - visible but refined */
    --df-border: rgba(15, 23, 42, 0.10);
    --df-border-strong: rgba(15, 23, 42, 0.18);
    --df-divider: rgba(15, 23, 42, 0.08);

    /* Premium glass effects for light mode - enhanced */
    --df-glass-bg: rgba(255, 255, 255, 0.95);
    --df-glass-bg-2: rgba(255, 255, 255, 0.85);
    --df-glass-bg-subtle: rgba(248, 250, 252, 0.90);
    --df-glass-border: rgba(255, 255, 255, 0.70);
    --df-glass-border-strong: rgba(15, 23, 42, 0.12);

    /* Navigation - crisp and refined */
    --df-nav-bg: rgba(255, 255, 255, 0.92);
    --df-nav-bg-scrolled: rgba(255, 255, 255, 0.98);
    --df-nav-border: rgba(15, 23, 42, 0.08);

    /* Inputs - clean with visible depth */
    --df-input-bg: #FFFFFF;
    --df-input-bg-focus: #FFFFFF;
    --df-input-border: rgba(15, 23, 42, 0.15);
    --df-input-border-focus: rgba(59, 130, 246, 0.60);

    /* Premium shadows - MORE DRAMATIC for visual impact */
    --df-shadow-color: rgba(15, 23, 42, 0.08);
    --df-shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.06);
    --df-shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.06);
    --df-shadow-md: 0 6px 16px rgba(15, 23, 42, 0.10), 0 3px 6px rgba(15, 23, 42, 0.06);
    --df-shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.14), 0 6px 12px rgba(15, 23, 42, 0.08);
    --df-shadow-xl: 0 28px 72px rgba(15, 23, 42, 0.18), 0 12px 24px rgba(15, 23, 42, 0.10);
    --df-shadow-glow: 0 0 0 4px rgba(59, 130, 246, 0.18);
    --df-shadow-card: 0 4px 12px rgba(15, 23, 42, 0.08), 0 2px 4px rgba(15, 23, 42, 0.05);
    --df-shadow-card-hover: 0 16px 48px rgba(15, 23, 42, 0.15), 0 8px 20px rgba(15, 23, 42, 0.10);

    /* theme-aware page background (used by settings/auth) */
    --df-page-bg-gradient: var(--page-bg-gradient);
    --df-page-bg-mesh: var(--page-bg-mesh);

    /* compatibility aliases (Option A: additive, not disruptive) */
    --color-primary: var(--df-primary);
    --color-primary-dark: var(--df-primary-darker);
    --color-primary-light: rgba(59, 130, 246, 0.12);
    --color-success: var(--df-success);
    --color-success-light: rgba(16, 185, 129, 0.12);
    --color-warning: var(--df-warning);
    --color-warning-light: rgba(245, 158, 11, 0.12);
    --color-danger: var(--df-error);
    --color-gray-50: var(--df-gray-50);
    --color-gray-100: var(--df-gray-100);
    --color-gray-200: var(--df-gray-200);
    --color-gray-300: var(--df-gray-300);
    --color-gray-400: var(--df-gray-400);
    --color-gray-500: var(--df-gray-500);
    --color-gray-600: var(--df-gray-600);
    --color-gray-700: var(--df-gray-700);
    --color-gray-800: var(--df-gray-800);
    --color-gray-900: var(--df-gray-900);

    /* Primary Colors - Deep Blue (Trust, Intelligence) */
    --primary-900: #1E3A8A;
    --primary-800: #1E40AF;
    --primary-700: #1D4ED8;
    --primary-600: #2563EB;
    --primary-500: #3B82F6;
    --primary-400: #60A5FA;
    --primary-300: #93C5FD;
    --primary-200: #BFDBFE;
    --primary-100: #DBEAFE;
    --primary-50: #EFF6FF;
    
    /* Secondary Colors - Electric Cyan (Innovation, Energy) */
    --secondary-900: #164E63;
    --secondary-800: #155E75;
    --secondary-700: #0E7490;
    --secondary-600: #0891B2;
    --secondary-500: #06B6D4;
    --secondary-400: #22D3EE;
    --secondary-300: #67E8F9;
    --secondary-200: #A5F3FC;
    --secondary-100: #CFFAFE;
    --secondary-50: #ECFEFF;
    
    /* Accent Colors - Amber (Alerts, Value, Highlights) */
    --accent-900: #78350F;
    --accent-800: #92400E;
    --accent-700: #B45309;
    --accent-600: #D97706;
    --accent-500: #F59E0B;
    --accent-400: #FBBF24;
    --accent-300: #FCD34D;
    --accent-200: #FDE68A;
    --accent-100: #FEF3C7;
    --accent-50: #FFFBEB;
    
    /* Success Colors - Emerald (Good Deals, Positive Actions) */
    --success-900: #064E3B;
    --success-800: #065F46;
    --success-700: #047857;
    --success-600: #059669;
    --success-500: #10B981;
    --success-400: #34D399;
    --success-300: #6EE7B7;
    --success-200: #A7F3D0;
    --success-100: #D1FAE5;
    --success-50: #ECFDF5;
    
    /* Error Colors - Red */
    --error-900: #7F1D1D;
    --error-800: #991B1B;
    --error-700: #B91C1C;
    --error-600: #DC2626;
    --error-500: #EF4444;
    --error-400: #F87171;
    --error-300: #FCA5A5;
    --error-200: #FECACA;
    --error-100: #FEE2E2;
    --error-50: #FEF2F2;
    
    /* Neutral Colors - Slate Gray */
    --gray-900: #0F172A;
    --gray-800: #1E293B;
    --gray-700: #334155;
    --gray-600: #475569;
    --gray-500: #64748B;
    --gray-400: #94A3B8;
    --gray-300: #CBD5E1;
    --gray-200: #E2E8F0;
    --gray-100: #F1F5F9;
    --gray-50: #F8FAFC;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
    
    /* Font Sizes */
    --text-xs: 0.75rem;      /* 12px */
    --text-sm: 0.875rem;     /* 14px */
    --text-base: 1rem;       /* 16px */
    --text-lg: 1.125rem;     /* 18px */
    --text-xl: 1.25rem;      /* 20px */
    --text-2xl: 1.5rem;      /* 24px */
    --text-3xl: 1.875rem;    /* 30px */
    --text-4xl: 2.25rem;     /* 36px */
    --text-5xl: 3rem;        /* 48px */
    --text-6xl: 3.75rem;     /* 60px */
    --text-7xl: 4.5rem;      /* 72px */
    
    /* Font Weights */
    --font-light: 300;
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;
    --font-black: 900;
    
    /* Line Heights */
    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;
    
    /* Letter Spacing */
    --tracking-tighter: -0.05em;
    --tracking-tight: -0.025em;
    --tracking-normal: 0;
    --tracking-wide: 0.025em;
    --tracking-wider: 0.05em;
    --tracking-widest: 0.1em;
    
    /* Spacing Scale */
    --space-0: 0;
    --space-1: 0.25rem;      /* 4px */
    --space-2: 0.5rem;       /* 8px */
    --space-3: 0.75rem;      /* 12px */
    --space-4: 1rem;         /* 16px */
    --space-5: 1.25rem;      /* 20px */
    --space-6: 1.5rem;       /* 24px */
    --space-8: 2rem;         /* 32px */
    --space-10: 2.5rem;      /* 40px */
    --space-12: 3rem;        /* 48px */
    --space-16: 4rem;        /* 64px */
    --space-20: 5rem;        /* 80px */
    --space-24: 6rem;        /* 96px */
    --space-32: 8rem;        /* 128px */
    
    /* Border Radius */
    --radius-none: 0;
    --radius-sm: 0.125rem;   /* 2px */
    --radius-base: 0.25rem;  /* 4px */
    --radius-md: 0.375rem;   /* 6px */
    --radius-lg: 0.5rem;     /* 8px */
    --radius-xl: 0.75rem;    /* 12px */
    --radius-2xl: 1rem;      /* 16px */
    --radius-3xl: 1.5rem;    /* 24px */
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slower: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-Index Scale */
    --z-0: 0;
    --z-10: 10;
    --z-20: 20;
    --z-30: 30;
    --z-40: 40;
    --z-50: 50;
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-900) 0%, var(--secondary-600) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--secondary-600) 0%, var(--secondary-400) 100%);
    --gradient-accent: linear-gradient(135deg, var(--accent-600) 0%, var(--accent-400) 100%);
    --gradient-success: linear-gradient(135deg, var(--success-600) 0%, var(--success-400) 100%);
    --gradient-hero: linear-gradient(135deg, #1E3A8A 0%, #0891B2 50%, #06B6D4 100%);
    --gradient-mesh: radial-gradient(at 0% 0%, var(--primary-900) 0px, transparent 50%),
                     radial-gradient(at 100% 0%, var(--secondary-600) 0px, transparent 50%),
                     radial-gradient(at 100% 100%, var(--primary-700) 0px, transparent 50%),
                     radial-gradient(at 0% 100%, var(--secondary-700) 0px, transparent 50%);

    /* ============================================
       Premium Glassmorphism Design System
       Light mode with refined depth and warmth
       ============================================ */

    /* Glass Backgrounds - crisp and luminous */
    --glass-bg-light: rgba(255, 255, 255, 0.92);
    --glass-bg-medium: rgba(255, 255, 255, 0.82);
    --glass-bg-heavy: rgba(255, 255, 255, 0.96);
    --glass-bg-dark: rgba(15, 23, 42, 0.85);
    --glass-bg-primary: rgba(59, 130, 246, 0.06);
    --glass-bg-accent: rgba(6, 182, 212, 0.06);
    --glass-bg-success: rgba(16, 185, 129, 0.06);
    --glass-bg-warning: rgba(245, 158, 11, 0.06);
    --glass-bg-error: rgba(239, 68, 68, 0.06);

    /* Glass Borders - refined with subtle visibility */
    --glass-border-light: rgba(255, 255, 255, 0.50);
    --glass-border-medium: rgba(15, 23, 42, 0.08);
    --glass-border-subtle: rgba(15, 23, 42, 0.05);
    --glass-border-dark: rgba(15, 23, 42, 0.12);
    --glass-border-primary: rgba(59, 130, 246, 0.25);
    --glass-border-hover: rgba(59, 130, 246, 0.40);

    /* Blur Values */
    --blur-sm: 8px;
    --blur-md: 12px;
    --blur-lg: 20px;
    --blur-xl: 40px;

    /* Glass Shadows - refined with subtle color */
    --glass-shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.05), 0 1px 2px rgba(15, 23, 42, 0.04);
    --glass-shadow-md: 0 6px 20px rgba(15, 23, 42, 0.08), 0 2px 6px rgba(15, 23, 42, 0.04);
    --glass-shadow-lg: 0 16px 48px rgba(15, 23, 42, 0.10), 0 4px 12px rgba(15, 23, 42, 0.05);
    --glass-shadow-xl: 0 24px 64px rgba(15, 23, 42, 0.12), 0 8px 20px rgba(15, 23, 42, 0.06);
    --glass-shadow-glow: 0 0 0 3px rgba(59, 130, 246, 0.12), 0 0 24px rgba(59, 130, 246, 0.10);
    --glass-shadow-inner: inset 0 1px 0 rgba(255, 255, 255, 0.50), inset 0 -1px 0 rgba(15, 23, 42, 0.03);
    --glass-shadow-inset: inset 0 2px 4px rgba(15, 23, 42, 0.04);

    /* Glass Gradients - subtle depth and dimension */
    --glass-gradient-light: linear-gradient(180deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 250, 252, 0.90) 100%);
    --glass-gradient-shine: linear-gradient(135deg, rgba(255, 255, 255, 0.40) 0%, transparent 50%, rgba(255, 255, 255, 0.15) 100%);
    --glass-gradient-primary: linear-gradient(135deg, rgba(59, 130, 246, 0.06) 0%, rgba(6, 182, 212, 0.04) 100%);
    --glass-gradient-surface: linear-gradient(180deg, #FFFFFF 0%, #FAFBFD 100%);
    --glass-gradient-card: linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
    --glass-gradient-hero: linear-gradient(180deg, #FAFBFD 0%, #F1F5F9 100%);

    /* Page Background Gradients - warm, inviting */
    --page-bg-gradient: linear-gradient(135deg, #F8FAFC 0%, #EFF6FF 30%, #F0FDFA 60%, #FAF5FF 85%, #FFF1F2 100%);
    --page-bg-mesh:
        radial-gradient(ellipse at 20% 15%, rgba(59, 130, 246, 0.06) 0%, transparent 55%),
        radial-gradient(ellipse at 80% 15%, rgba(6, 182, 212, 0.05) 0%, transparent 55%),
        radial-gradient(ellipse at 40% 60%, rgba(139, 92, 246, 0.04) 0%, transparent 55%),
        radial-gradient(ellipse at 85% 85%, rgba(236, 72, 153, 0.03) 0%, transparent 55%);
}

:root[data-theme="dark"] {
    color-scheme: dark;

    /* Premium Chalk Dark Theme - Warm neutral grays (no blue tint)
       Inspired by Linear, Notion, Spotify, Apple native dark modes */
    --df-bg: var(--df-dark-900);
    --df-surface: var(--df-dark-800);
    --df-text: var(--df-dark-50);
    --df-text-2: var(--df-dark-400);
    --df-text-3: var(--df-dark-500);
    --df-border: var(--df-dark-700);
    --df-divider: var(--df-dark-700);

    /* Glass backgrounds - warm chalk transparencies */
    --df-glass-bg: rgba(20, 20, 20, 0.90);
    --df-glass-bg-2: rgba(34, 34, 34, 0.80);
    --df-glass-border: rgba(255, 255, 255, 0.10);

    /* Navigation backgrounds - warm neutral */
    --df-nav-bg: rgba(20, 20, 20, 0.85);
    --df-nav-bg-scrolled: rgba(20, 20, 20, 0.96);
    --df-input-bg: rgba(34, 34, 34, 0.80);
    --df-input-bg-focus: rgba(34, 34, 34, 0.95);
    --df-shadow-color: rgba(0, 0, 0, 0.50);

    /* Page background - warm neutral gradient */
    --df-page-bg-gradient: linear-gradient(135deg, #101010 0%, #161616 35%, #101010 100%);
    --df-page-bg-mesh:
        radial-gradient(ellipse at 20% 20%, rgba(59, 130, 246, 0.10) 0%, transparent 55%),
        radial-gradient(ellipse at 80% 20%, rgba(6, 182, 212, 0.08) 0%, transparent 55%),
        radial-gradient(ellipse at 40% 65%, rgba(139, 92, 246, 0.06) 0%, transparent 55%),
        radial-gradient(ellipse at 80% 80%, rgba(236, 72, 153, 0.05) 0%, transparent 55%);

    /* Remap existing design-system neutrals for dark mode (use chalk palette) */
    --gray-50: var(--df-dark-900);
    --gray-100: var(--df-dark-800);
    --gray-200: var(--df-dark-700);
    --gray-300: var(--df-dark-600);
    --gray-400: var(--df-dark-500);
    --gray-500: var(--df-dark-400);
    --gray-600: var(--df-dark-300);
    --gray-700: var(--df-dark-200);
    --gray-800: var(--df-dark-100);
    --gray-900: var(--df-dark-50);

    /* Remap legacy --color-gray-* tokens used across templates */
    --color-gray-50: var(--df-dark-900);
    --color-gray-100: var(--df-dark-800);
    --color-gray-200: var(--df-dark-700);
    --color-gray-300: var(--df-dark-600);
    --color-gray-400: var(--df-dark-500);
    --color-gray-500: var(--df-dark-400);
    --color-gray-600: var(--df-dark-300);
    --color-gray-700: var(--df-dark-200);
    --color-gray-800: var(--df-dark-100);
    --color-gray-900: var(--df-dark-50);

    /* Make “light” brand tints usable on dark surfaces */
    --color-primary-light: rgba(59, 130, 246, 0.16);
    --color-success-light: rgba(16, 185, 129, 0.16);
    --color-warning-light: rgba(245, 158, 11, 0.16);

    /* Glass variables used by older CSS - warm chalk palette */
    --glass-bg-light: rgba(20, 20, 20, 0.90);
    --glass-bg-medium: rgba(34, 34, 34, 0.80);
    --glass-bg-heavy: rgba(34, 34, 34, 0.96);
    --glass-bg-dark: rgba(20, 20, 20, 0.92);

    --glass-border-light: rgba(255, 255, 255, 0.12);
    --glass-border-medium: rgba(255, 255, 255, 0.10);
    --glass-border-subtle: rgba(255, 255, 255, 0.07);
    --glass-border-dark: rgba(255, 255, 255, 0.10);

    /* Glass gradient - warm neutral surface */
    --glass-gradient-surface: linear-gradient(180deg, rgba(34, 34, 34, 0.96) 0%, rgba(20, 20, 20, 0.88) 100%);
}

/* ============================================
   Base Styles
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-family);
    font-size: var(--text-base);
    font-weight: var(--font-normal);
    line-height: var(--leading-normal);
    color: var(--df-text);
    background-color: var(--df-bg);
}

/* Theme toggle (shared) */
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 9999px;
    border: 1px solid var(--df-border);
    background: var(--df-input-bg);
    color: var(--df-text-2);
    cursor: pointer;
    transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.theme-toggle:hover {
    transform: translateY(-1px);
    background: var(--df-input-bg-focus);
    border-color: color-mix(in srgb, var(--df-border), var(--df-primary) 35%);
    color: var(--df-text);
}

.theme-toggle:active {
    transform: translateY(0px) scale(0.98);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
}

.theme-toggle .icon-sun { display: inline; }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: inline; }

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-bold);
    line-height: var(--leading-tight);
    color: var(--gray-900);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
    margin-bottom: var(--space-4);
    line-height: var(--leading-relaxed);
}

a {
    color: var(--primary-600);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-700);
}

strong {
    font-weight: var(--font-semibold);
}

code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background-color: var(--gray-100);
    padding: 0.125rem 0.25rem;
    border-radius: var(--radius-base);
}

/* ============================================
   Utility Classes
   ============================================ */
.container {
    width: 100%;
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
}

.container-sm { max-width: 640px; }
.container-md { max-width: 768px; }
.container-lg { max-width: 1024px; }
.container-xl { max-width: 1280px; }
.container-2xl { max-width: 1536px; }

/* Text Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.font-light { font-weight: var(--font-light); }
.font-normal { font-weight: var(--font-normal); }
.font-medium { font-weight: var(--font-medium); }
.font-semibold { font-weight: var(--font-semibold); }
.font-bold { font-weight: var(--font-bold); }

/* Color Utilities */
.text-primary { color: var(--primary-600); }
.text-secondary { color: var(--secondary-600); }
.text-accent { color: var(--accent-600); }
.text-success { color: var(--success-600); }
.text-error { color: var(--error-600); }
.text-gray { color: var(--gray-600); }

.bg-primary { background-color: var(--primary-600); }
.bg-secondary { background-color: var(--secondary-600); }
.bg-white { background-color: white; }
:root[data-theme="dark"] .bg-white { background-color: var(--df-surface); }
.bg-gray-50 { background-color: var(--gray-50); }

/* Gradient Text */
.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ============================================
   Glassmorphism Utility Classes
   ============================================ */

/* Glass Containers */
.glass {
    background: var(--df-glass-bg);
    backdrop-filter: blur(var(--blur-lg));
    -webkit-backdrop-filter: blur(var(--blur-lg));
    border: 1px solid var(--df-glass-border);
    box-shadow: var(--glass-shadow-md), var(--glass-shadow-inner);
}

.glass-light {
    background: var(--df-glass-bg-2);
    backdrop-filter: blur(var(--blur-md));
    -webkit-backdrop-filter: blur(var(--blur-md));
    border: 1px solid var(--df-glass-border);
    box-shadow: var(--glass-shadow-sm);
}

.glass-heavy {
    background: var(--df-glass-bg);
    backdrop-filter: blur(var(--blur-xl));
    -webkit-backdrop-filter: blur(var(--blur-xl));
    border: 1px solid var(--df-glass-border);
    box-shadow: var(--glass-shadow-lg), var(--glass-shadow-inner);
}

.glass-dark {
    background: var(--glass-bg-dark);
    backdrop-filter: blur(var(--blur-lg));
    -webkit-backdrop-filter: blur(var(--blur-lg));
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--glass-shadow-lg);
}

.glass-primary {
    background: linear-gradient(135deg, rgba(30, 58, 138, 0.1) 0%, rgba(6, 182, 212, 0.08) 100%);
    backdrop-filter: blur(var(--blur-lg));
    -webkit-backdrop-filter: blur(var(--blur-lg));
    border: 1px solid var(--glass-border-primary);
    box-shadow: var(--glass-shadow-md), var(--glass-shadow-glow);
}

/* Glass Cards */
.glass-card {
    background: var(--glass-gradient-surface);
    backdrop-filter: blur(var(--blur-lg));
    -webkit-backdrop-filter: blur(var(--blur-lg));
    border: 1px solid var(--glass-border-dark);
    border-radius: var(--radius-2xl);
    box-shadow: var(--glass-shadow-md);
    transition: all var(--transition-base);
}

.glass-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--glass-shadow-lg), var(--glass-shadow-glow);
    border-color: var(--glass-border-primary);
}

/* Glass Navigation */
.glass-nav {
    background: var(--df-nav-bg);
    backdrop-filter: blur(var(--blur-lg)) saturate(180%);
    -webkit-backdrop-filter: blur(var(--blur-lg)) saturate(180%);
    border-bottom: 1px solid var(--df-glass-border);
    box-shadow: 0 1px 3px var(--df-shadow-color);
}

/* Glass Buttons */
.glass-btn {
    background: var(--glass-bg-medium);
    backdrop-filter: blur(var(--blur-sm));
    -webkit-backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--glass-border-medium);
    box-shadow: var(--glass-shadow-sm);
    transition: all var(--transition-fast);
}

.glass-btn:hover {
    background: var(--glass-bg-light);
    box-shadow: var(--glass-shadow-md);
    transform: translateY(-1px);
}

.glass-btn-primary {
    background: linear-gradient(135deg, rgba(30, 58, 138, 0.9) 0%, rgba(59, 130, 246, 0.9) 100%);
    backdrop-filter: blur(var(--blur-sm));
    -webkit-backdrop-filter: blur(var(--blur-sm));
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    box-shadow: var(--glass-shadow-md), 0 0 20px rgba(59, 130, 246, 0.3);
}

.glass-btn-primary:hover {
    box-shadow: var(--glass-shadow-lg), 0 0 30px rgba(59, 130, 246, 0.4);
    transform: translateY(-2px);
}

/* Glass Inputs */
.glass-input {
    background: var(--df-input-bg);
    backdrop-filter: blur(var(--blur-sm));
    -webkit-backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--df-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-fast);
}

.glass-input:focus {
    background: var(--df-input-bg-focus);
    border-color: var(--df-primary-light);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.18), var(--glass-shadow-sm);
    outline: none;
}

/* Page Background with Glassmorphism */
.glass-page-bg {
    background: var(--df-page-bg-gradient);
    min-height: 100vh;
    position: relative;
}

.glass-page-bg::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--df-page-bg-mesh);
    pointer-events: none;
    z-index: 0;
}

/* Animations for Glass Elements */
@keyframes glassShine {
    0% { background-position: -200% center; }
    100% { background-position: 200% center; }
}

.glass-shine {
    position: relative;
    overflow: hidden;
}

.glass-shine::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.3) 50%,
        transparent 100%
    );
    background-size: 200% 100%;
    animation: glassShine 3s ease-in-out infinite;
    pointer-events: none;
}