/* ============================================
   BKT Dijital - Main Stylesheet
   Enterprise Grade - Charcoal + Amber Theme
   ============================================ */

/* CSS Custom Properties (Variables) */
:root {
    /* Colors - Amber */
    --color-amber-50: #fffbeb;
    --color-amber-100: #fef3c7;
    --color-amber-200: #fde68a;
    --color-amber-300: #fcd34d;
    --color-amber-400: #fbbf24;
    --color-amber-500: #f59e0b;
    --color-amber-600: #d97706;
    --color-amber-700: #b45309;
    --color-amber-800: #92400e;
    --color-amber-900: #78350f;
    
    /* Colors - Charcoal/Gray */
    --color-charcoal-50: #f9fafb;
    --color-charcoal-100: #f3f4f6;
    --color-charcoal-200: #e5e7eb;
    --color-charcoal-300: #d1d5db;
    --color-charcoal-400: #9ca3af;
    --color-charcoal-500: #6b7280;
    --color-charcoal-600: #4b5563;
    --color-charcoal-700: #374151;
    --color-charcoal-800: #1f2937;
    --color-charcoal-900: #111827;
    
    /* Primary Colors */
    --color-primary: #f59e0b;
    --color-primary-dark: #d97706;
    --color-primary-light: #fbbf24;
    
    /* Background Colors - Charcoal Theme */
    --color-bg: #1f2937;
    --color-bg-alt: #374151;
    --color-bg-dark: #111827;
    --color-bg-card: #374151;
    
    /* Text Colors */
    --color-text: #ffffff;
    --color-text-light: #d1d5db;
    --color-text-inverse: #ffffff;
    
    /* Border Colors */
    --color-border: #4b5563;
    --color-border-dark: #374151;
    
    /* Typography */
    --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-heading: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --container-padding: var(--spacing-md);
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Shadows - Dark theme shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.6);
    --shadow-amber: 0 10px 25px rgba(245, 158, 11, 0.3);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    background-color: #1f2937 !important;
    background: #1f2937 !important;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: #ffffff;
    background-color: #1f2937 !important;
    background: #1f2937 !important;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    overflow-x: hidden;
}

main {
    background-color: #1f2937 !important;
    background: #1f2937 !important;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-heading);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: #ffffff;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: var(--font-size-4xl);
}

h2 {
    font-size: var(--font-size-3xl);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: #ffffff;
    position: relative;
    padding-bottom: var(--spacing-md);
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, transparent, #f59e0b, transparent);
    border-radius: var(--radius-full);
    box-shadow: 0 0 10px rgba(245, 158, 11, 0.5);
}

h3 {
    font-size: var(--font-size-2xl);
    color: #ffffff;
}

h4 {
    font-size: var(--font-size-xl);
    color: #ffffff;
}

h5 {
    font-size: var(--font-size-lg);
    color: #ffffff;
}

h6 {
    font-size: var(--font-size-base);
    color: #ffffff;
}

p {
    margin-bottom: var(--spacing-md);
    color: #d1d5db;
    line-height: var(--line-height-relaxed);
}

a {
    color: #f59e0b;
    text-decoration: none;
    transition: all var(--transition-fast);
}

a:hover {
    color: #fbbf24;
}

a:focus {
    outline: 2px solid #f59e0b;
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

ul, ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xl);
}

li {
    margin-bottom: var(--spacing-xs);
    color: #d1d5db;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

/* Section */
.section {
    padding: var(--spacing-4xl) 0;
    position: relative;
}

.section-description {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
    color: #d1d5db;
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    text-align: center;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    box-shadow: 0 4px 6px rgba(245, 158, 11, 0.3);
}

.btn-primary {
    background-color: #f59e0b;
    color: #ffffff;
    border: 2px solid #f59e0b;
}

.btn-primary:hover {
    background-color: #d97706;
    border-color: #d97706;
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(245, 158, 11, 0.5);
}

.btn-secondary {
    background-color: transparent;
    color: #f59e0b;
    border: 2px solid #f59e0b;
}

.btn-secondary:hover {
    background-color: #f59e0b;
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(245, 158, 11, 0.5);
}

/* Header & Navigation */
.header {
    background-color: #111827;
    border-bottom: 2px solid #374151;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--container-padding);
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: #ffffff;
    text-decoration: none;
    transition: all var(--transition-base);
}

.logo:hover {
    color: #f59e0b;
    text-shadow: 0 0 10px rgba(245, 158, 11, 0.5);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
    padding: 0;
    margin: 0;
}

.nav-menu a {
    color: #ffffff;
    font-weight: var(--font-weight-medium);
    padding: var(--spacing-sm) 0;
    position: relative;
    transition: all var(--transition-base);
}

.nav-menu a:hover,
.nav-menu a.active {
    color: #f59e0b;
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background-color: #f59e0b;
    box-shadow: 0 0 8px rgba(245, 158, 11, 0.6);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: #ffffff;
    transition: all var(--transition-base);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #111827 0%, #1f2937 50%, #374151 100%);
    padding: var(--spacing-4xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(245, 158, 11, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

.hero h1 {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--spacing-md);
    color: #ffffff;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 1;
}

.hero-tagline {
    font-size: var(--font-size-2xl);
    color: #f59e0b;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
    position: relative;
    z-index: 1;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: #d1d5db;
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
    position: relative;
    z-index: 1;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

/* Footer */
.footer {
    background-color: #111827;
    color: #ffffff;
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
    border-top: 2px solid #374151;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h3,
.footer-section h4 {
    color: #ffffff;
    margin-bottom: var(--spacing-md);
}

.footer-section p {
    color: #d1d5db;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: #d1d5db;
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: #f59e0b;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid #374151;
}

.footer-bottom p {
    color: #9ca3af;
    margin: 0;
}