/* ============================================
   ELITE DESIGN SYSTEM - MODERN UI/UX
   Kohkah Global Concepts - Premium Upgrade
   ============================================ */

:root {
    /* ============================================
       COLOR SYSTEM - MODERN PALETTE
       ============================================ */
    
    /* Primary Colors */
    --primary-navy: #0a1628;
    --primary-navy-dark: #050a14;
    --primary-navy-light: #1a2b4d;
    --primary-navy-lighter: #2a3d5f;
    
    /* Accent Colors */
    --accent-gold: #d4af37;
    --accent-gold-light: #f4e4bc;
    --accent-gold-dark: #b8941f;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    
    /* Neutral Colors */
    --white: #ffffff;
    --white-soft: #fafbfc;
    --grey-50: #f9fafb;
    --grey-100: #f3f4f6;
    --grey-200: #e5e7eb;
    --grey-300: #d1d5db;
    --grey-400: #9ca3af;
    --grey-500: #6b7280;
    --grey-600: #4b5563;
    --grey-700: #374151;
    --grey-800: #1f2937;
    --grey-900: #111827;
    --black: #000000;
    
    /* Semantic Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    
    /* Gradient System */
    --gradient-primary: linear-gradient(135deg, var(--primary-navy) 0%, var(--primary-navy-light) 50%, var(--primary-navy-lighter) 100%);
    --gradient-gold: linear-gradient(135deg, var(--accent-gold) 0%, var(--accent-gold-light) 100%);
    --gradient-hero: linear-gradient(135deg, rgba(10, 22, 40, 0.95) 0%, rgba(26, 43, 77, 0.9) 100%);
    --gradient-overlay: linear-gradient(180deg, transparent 0%, rgba(10, 22, 40, 0.7) 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    
    /* Shadow System */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 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);
    --shadow-glow: 0 0 20px rgba(212, 175, 55, 0.3);
    --shadow-glow-lg: 0 0 40px rgba(212, 175, 55, 0.5);
    
    /* Typography System */
    --font-primary: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-secondary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;
    
    /* 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 */
    --text-8xl: 6rem;        /* 96px */
    
    /* Font Weights */
    --weight-light: 300;
    --weight-normal: 400;
    --weight-medium: 500;
    --weight-semibold: 600;
    --weight-bold: 700;
    --weight-extrabold: 800;
    
    /* Line Heights */
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;
    
    /* Spacing System */
    --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-sm: 0.125rem;   /* 2px */
    --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;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slower: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 600ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* Z-Index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    --z-toast: 1080;
    
    /* Layout */
    --container-max-width: 1400px;
    --container-padding: 2.5rem;
    --section-padding: 6rem 0;
    --section-padding-sm: 4rem 0;
    
    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-backdrop: blur(10px);
    
    /* Dark Mode Colors (for future implementation) */
    --dark-bg: #0a1628;
    --dark-surface: #1a2b4d;
    --dark-text: #f9fafb;
    --dark-text-muted: #9ca3af;
}

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

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

body {
    font-family: var(--font-secondary);
    font-size: var(--text-base);
    line-height: var(--leading-relaxed);
    color: var(--grey-800);
    background-color: var(--white);
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* ============================================
   MODERN TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: var(--weight-bold);
    line-height: var(--leading-tight);
    color: var(--primary-navy);
    letter-spacing: -0.02em;
}

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);
    color: var(--grey-600);
    line-height: var(--leading-relaxed);
}

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

a:hover {
    color: var(--accent-gold);
}

/* ============================================
   MODERN CONTAINER SYSTEM
   ============================================ */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--container-padding);
}

.container-narrow {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ============================================
   MODERN BUTTON SYSTEM
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-6);
    font-family: var(--font-primary);
    font-size: var(--text-base);
    font-weight: var(--weight-semibold);
    line-height: 1;
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 2px solid transparent;
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    color: var(--white);
}

.btn-secondary {
    background: var(--white);
    color: var(--primary-navy);
    border-color: var(--primary-navy);
}

.btn-secondary:hover {
    background: var(--primary-navy);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--primary-navy);
    border-color: var(--primary-navy);
}

.btn-outline:hover {
    background: var(--primary-navy);
    color: var(--white);
}

.btn-gold {
    background: var(--gradient-gold);
    color: var(--primary-navy);
    font-weight: var(--weight-bold);
}

.btn-gold:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
    color: var(--primary-navy);
}

.btn-large {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-lg);
}

.btn-small {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
}

/* ============================================
   MODERN CARD SYSTEM
   ============================================ */
.card {
    background: var(--white);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: all var(--transition-base);
    position: relative;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
}

.card-header {
    padding: var(--space-6);
    border-bottom: 1px solid var(--grey-200);
}

.card-body {
    padding: var(--space-6);
}

.card-footer {
    padding: var(--space-6);
    border-top: 1px solid var(--grey-200);
    background: var(--grey-50);
}

.card-image {
    width: 100%;
    height: auto;
    display: block;
}

/* ============================================
   MODERN GRID SYSTEM
   ============================================ */
.grid {
    display: grid;
    gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

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

.grid-masonry {
    column-count: 3;
    column-gap: var(--space-6);
}

/* ============================================
   MODERN SECTION TITLES
   ============================================ */
.section-title {
    font-family: var(--font-primary);
    font-size: var(--text-5xl);
    font-weight: var(--weight-bold);
    color: var(--primary-navy);
    margin-bottom: var(--space-6);
    letter-spacing: -0.03em;
    line-height: var(--leading-tight);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 0;
    width: 80px;
    height: 4px;
    background: var(--gradient-gold);
    border-radius: var(--radius-full);
}

.section-title-center {
    text-align: center;
    display: block;
}

.section-title-center::after {
    left: 50%;
    transform: translateX(-50%);
}

.section-subtitle {
    font-family: var(--font-secondary);
    font-size: var(--text-lg);
    color: var(--grey-600);
    margin-bottom: var(--space-8);
    text-align: center;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================
   MODERN UTILITIES
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-gold { color: var(--accent-gold); }
.text-navy { color: var(--primary-navy); }
.text-muted { color: var(--grey-600); }

.bg-white { background-color: var(--white); }
.bg-grey { background-color: var(--grey-50); }
.bg-navy { background-color: var(--primary-navy); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }
.rounded-full { border-radius: var(--radius-full); }

/* ============================================
   MODERN ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.animate-fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

.animate-fade-in-down {
    animation: fadeInDown 0.6s ease-out;
}

.animate-fade-in {
    animation: fadeIn 0.6s ease-out;
}

.animate-scale-in {
    animation: scaleIn 0.6s ease-out;
}

/* ============================================
   MODERN RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-masonry { column-count: 2; }
}

@media (max-width: 768px) {
    :root {
        --container-padding: 1.5rem;
        --section-padding: 4rem 0;
        --section-padding-sm: 3rem 0;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .grid-masonry {
        column-count: 1;
    }
    
    .section-title {
        font-size: var(--text-3xl);
    }
    
    h1 { font-size: var(--text-4xl); }
    h2 { font-size: var(--text-3xl); }
    h3 { font-size: var(--text-2xl); }
}

@media (max-width: 480px) {
    :root {
        --container-padding: 1rem;
    }
    
    .btn {
        padding: var(--space-2) var(--space-4);
        font-size: var(--text-sm);
    }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles */
*:focus-visible {
    outline: 2px solid var(--accent-gold);
    outline-offset: 2px;
}

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}