/* ============================================
   KELAJAK MUHANDISLARI - CSS Variables
   Professional International-Standard Design
   ============================================ */

:root {
    /* Primary Colors - Modern Electric Blue */
    --primary: #2563EB;
    --primary-dark: #1D4ED8;
    --primary-darker: #1E40AF;
    --primary-light: #60A5FA;
    --primary-alpha: rgba(37, 99, 235, 0.15);

    /* Accent - Warm Amber */
    --accent: #F6B042;
    --accent-light: #FFD37A;
    --accent-dark: #D9822B;
    --accent-alpha: rgba(246, 176, 66, 0.15);

    /* Secondary - Bright Teal */
    --secondary: #14B8A6;
    --secondary-light: #2DD4BF;
    --secondary-dark: #0F766E;

    /* Success, Warning, Error */
    --success: #10B981;
    --warning: #F59E0B;
    --error: #EF4444;

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

    /* Background Colors */
    --bg-primary: #030712;
    --bg-secondary: #0A0F1C;
    --bg-tertiary: #111827;
    --bg-card: rgba(17, 24, 39, 0.7);
    --bg-card-hover: rgba(31, 41, 55, 0.8);
    --bg-gradient: linear-gradient(135deg, #030712 0%, #0A0F1C 50%, #111827 100%);
    --bg-gradient-radial: radial-gradient(ellipse at center, #111827 0%, #030712 100%);

    /* Text Colors */
    --text-primary: #F9FAFB;
    --text-secondary: #D1D5DB;
    --text-muted: #9CA3AF;
    --text-disabled: #6B7280;

    /* Gradient Text */
    --gradient-text: linear-gradient(135deg, var(--primary) 0%, var(--accent) 50%, var(--secondary) 100%);
    --gradient-gold: linear-gradient(135deg, var(--accent-dark) 0%, var(--accent) 55%, var(--accent-light) 100%);
    --gradient-blue: linear-gradient(135deg, var(--primary-darker) 0%, var(--primary) 55%, var(--secondary-light) 100%);

    /* Border Colors */
    --border-primary: rgba(255, 255, 255, 0.08);
    --border-secondary: rgba(255, 255, 255, 0.12);
    --border-accent: rgba(37, 99, 235, 0.3);
    --border-gold: rgba(246, 176, 66, 0.3);

    /* Shadow Colors */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.5);
    --shadow-primary: 0 10px 40px rgba(37, 99, 235, 0.25);
    --shadow-gold: 0 10px 40px rgba(246, 176, 66, 0.22);

    /* Glow Effects */
    --glow-primary: 0 0 30px rgba(37, 99, 235, 0.4);
    --glow-gold: 0 0 30px rgba(246, 176, 66, 0.45);
    --glow-secondary: 0 0 30px rgba(20, 184, 166, 0.4);

    /* Typography - Professional Fonts */
    --font-primary: var(--font-body);
    --font-display: 'Inter', system-ui, sans-serif;
    --font-body: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Font Sizes - Modular Scale */
    --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-hero: clamp(2.5rem, 6vw, 4.5rem);

    /* Font Weights */
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;

    /* Line Heights */
    --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 */
    --space-4xl: 6.25rem;    /* 100px - section padding */

    /* Border Radius */
    --radius-none: 0;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    --radius-3xl: 32px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    --transition-slower: 500ms ease;
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Z-Index Scale */
    --z-below: -1;
    --z-base: 0;
    --z-above: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
    --z-toast: 800;
    --z-loading: 1000;

    /* Layout */
    --navbar-height: 72px;
    --navbar-bg: rgba(3, 7, 18, 0.85);
    --container-max: 1280px;
    --container-padding: 24px;

    /* Breakpoints (for reference) */
    --bp-sm: 640px;
    --bp-md: 768px;
    --bp-lg: 1024px;
    --bp-xl: 1280px;
    --bp-2xl: 1536px;
}

/* Dark Theme (Default) */
[data-theme="dark"] {
    color-scheme: dark;
}

/* Light Theme Override (if needed later) */
[data-theme="light"] {
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    --bg-card: rgba(255, 255, 255, 0.9);
    --text-primary: #111827;
    --text-secondary: #374151;
    --text-muted: #6B7280;
    --border-primary: rgba(0, 0, 0, 0.08);
    --border-secondary: rgba(0, 0, 0, 0.12);
    color-scheme: light;
}