/* ==========================================================================
   Kehribar Nedir - Modern Responsive Stylesheet
   ========================================================================== */

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

/* CSS Custom Properties (Variables) */
:root {
    /* Colors */
    --primary-color: #1a1a1a;
    --secondary-color: #2d2d2d;
    --accent-color: #d67722;
    --accent-hover: #b85e1a;
    --text-primary: #ffffff;
    --text-secondary: #e0e0e0;
    --text-muted: #b0b0b0;
    --border-color: #444;
    
    /* Shadows */
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 6px 12px rgba(0, 0, 0, 0.4);
    --shadow-light: 0 2px 4px rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Typography */
    --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-sm: 0.9rem;
    --font-size-base: 1rem;
    --font-size-md: 1.1rem;
    --font-size-lg: 1.3rem;
    --font-size-xl: 1.5rem;
    --font-size-xxl: 2rem;
    --line-height: 1.6;
    
    /* Layout */
    --max-width: 1200px;
    --sidebar-width: 300px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
}

/* Base Typography */
body {
    font-family: var(--font-primary);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--text-primary);
    line-height: var(--line-height);
    min-height: 100vh;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
    line-height: 1.2;
}

h1 {
    font-size: var(--font-size-xxl);
    color: var(--accent-color);
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

h2 {
    font-size: var(--font-size-xl);
    color: var(--accent-color);
}

h3 {
    font-size: var(--font-size-lg);
    color: var(--accent-color);
}

/* Paragraphs */
p {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-md);
    color: var(--text-secondary);
}

/* Lists */
ul, ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

li {
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
    line-height: var(--line-height);
}

/* Links */
a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* ==========================================================================
   Layout Components
   ========================================================================== */

/* Header */
.header {
    background: linear-gradient(to bottom, rgba(0,0,0,0.9), rgba(0,0,0,0.7)), 
                url('../images/main_01.gif') center/cover;
    padding: var(--spacing-lg) 0;
    border-bottom: 3px solid var(--accent-color);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, 
        rgba(214, 119, 34, 0.1) 0%, 
        transparent 50%, 
        rgba(214, 119, 34, 0.05) 100%);
    pointer-events: none;
}

.header-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
    z-index: 1;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-text {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--accent-color);
    text-decoration: none;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
    letter-spacing: -0.02em;
    transition: all 0.3s ease;
    background: linear-gradient(135deg, var(--accent-color) 0%, #f4a261 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.logo-text:hover {
    transform: translateY(-2px);
    text-shadow: 0 4px 8px rgba(214, 119, 34, 0.3);
    filter: brightness(1.1);
}

.logo-text::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s ease;
}

.logo-text:hover::after {
    width: 100%;
}

.header-image {
    display: none;
}

/* Breadcrumb Navigation */
.breadcrumb {
    background: rgba(0,0,0,0.3);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-color);
}

.breadcrumb-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: var(--font-size-sm);
}

.breadcrumb-item:not(:last-child)::after {
    content: '›';
    margin: 0 var(--spacing-xs);
    color: var(--text-muted);
}

.breadcrumb-item a {
    color: var(--text-muted);
    transition: color 0.3s ease;
}

.breadcrumb-item a:hover {
    color: var(--accent-color);
}

.breadcrumb-item.current {
    color: var(--accent-color);
}

/* Main Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr var(--sidebar-width);
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    min-height: calc(100vh - 200px);
}

/* Main Content */
.main-content {
    background: var(--secondary-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.content-header {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--accent-color);
}

.content-title {
    margin-bottom: var(--spacing-xs);
}

.content-section {
    margin-bottom: calc(var(--spacing-lg) + var(--spacing-xs));
}

.content-text {
    font-size: var(--font-size-md);
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

/* ==========================================================================
   Image Components
   ========================================================================== */

.content-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 2px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.content-image:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.image-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    align-items: start;
}

.image-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-sm);
    margin: var(--spacing-lg) 0;
    align-items: center;
}

.image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
    margin: var(--spacing-lg) 0;
}

.image-caption {
    font-style: italic;
    color: var(--text-muted);
    text-align: center;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.image-center {
    text-align: center;
    margin: var(--spacing-lg) 0;
}

/* ==========================================================================
   Sidebar Components
   ========================================================================== */

.sidebar {
    background: var(--secondary-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    align-self: start;
    position: sticky;
    top: var(--spacing-lg);
    max-height: calc(100vh - 2rem);
    overflow-y: auto;
}

.sidebar-header {
    background: linear-gradient(45deg, var(--accent-color), var(--accent-hover));
    margin: calc(-1 * var(--spacing-md)) calc(-1 * var(--spacing-md)) var(--spacing-md) calc(-1 * var(--spacing-md));
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
    color: white;
    font-weight: 600;
    text-align: center;
    position: relative;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: var(--font-size-xl);
    cursor: pointer;
    z-index: 1000;
}

.nav-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-item {
    margin-bottom: var(--spacing-xs);
}

.nav-link {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.75rem var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.nav-link:hover, .nav-link.active {
    background: linear-gradient(45deg, var(--accent-color), var(--accent-hover));
    color: white;
    transform: translateX(4px);
    border-color: var(--accent-color);
}

/* ==========================================================================
   Special Components
   ========================================================================== */

/* Process Diagram */
.process-diagram {
    background: linear-gradient(45deg, #f8f8f8, #e8e8e8);
    border: 2px solid var(--accent-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    text-align: center;
    color: #333;
}

.process-steps {
    display: flex;
    justify-content: space-around;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.process-step {
    flex: 1;
    min-width: 120px;
    padding: var(--spacing-sm);
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    font-weight: 600;
    color: var(--accent-color);
}

.process-arrow {
    font-size: var(--font-size-xl);
    color: var(--accent-color);
    font-weight: bold;
}

.process-labels {
    display: flex;
    justify-content: space-around;
    margin-top: var(--spacing-sm);
    font-weight: 600;
    color: var(--accent-color);
}

/* Back to Top */
.back-to-top {
    text-align: center;
    margin: var(--spacing-lg) 0;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.back-to-top a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.back-to-top a:hover {
    color: var(--accent-hover);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
    background: var(--primary-color);
    border-top: 3px solid var(--accent-color);
    padding: var(--spacing-lg) 0;
    text-align: center;
    margin-top: var(--spacing-xl);
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.footer-text {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-sm);
}

.footer-text a {
    color: var(--accent-color);
    text-decoration: none;
}

.footer-text a:hover {
    color: var(--accent-hover);
}

.copyright {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

/* Tablet Styles */
@media (max-width: 768px) {
    :root {
        --spacing-sm: 0.75rem;
        --spacing-md: 1rem;
        --spacing-lg: 1.5rem;
        --font-size-xxl: 1.5rem;
        --font-size-xl: 1.3rem;
    }

    .header-content {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }

    .container {
        grid-template-columns: 1fr;
        padding: var(--spacing-sm);
        gap: var(--spacing-sm);
    }

    .sidebar {
        position: relative;
        top: 0;
        order: -1;
        max-height: none;
    }

    .nav-toggle {
        display: block;
    }

    .sidebar .nav-menu {
        display: none;
        margin-top: var(--spacing-sm);
    }

    .sidebar.active .nav-menu {
        display: block;
    }

    .image-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .image-row {
        grid-template-columns: 1fr;
    }

    .image-gallery {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }

    .main-content {
        padding: var(--spacing-md);
    }

    .process-steps {
        flex-direction: column;
    }

    .process-arrow {
        transform: rotate(90deg);
    }

    .process-labels {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
}

/* Mobile Styles */
@media (max-width: 480px) {
    :root {
        --spacing-xs: 0.25rem;
        --spacing-sm: 0.5rem;
        --spacing-md: 0.75rem;
        --spacing-lg: 1rem;
        --font-size-xxl: 1.3rem;
        --font-size-xl: 1.2rem;
        --font-size-lg: 1.1rem;
        --font-size-md: 1rem;
    }

    .header {
        padding: var(--spacing-sm) 0;
    }

    .container {
        padding: var(--spacing-xs);
    }

    .main-content, .sidebar {
        padding: var(--spacing-sm);
        border-radius: var(--border-radius);
    }

    .logo img {
        max-width: 150px;
    }

    .breadcrumb-content,
    .header-content,
    .footer-content {
        padding: 0 var(--spacing-sm);
    }
}

/* ==========================================================================
   Animations
   ========================================================================== */

.main-content, .sidebar {
    animation: fadeInUp 0.6s ease-out;
}

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

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Print Styles */
@media print {
    .sidebar, .nav-toggle, .breadcrumb, .back-to-top {
        display: none;
    }
    
    .container {
        grid-template-columns: 1fr;
    }
    
    .main-content {
        box-shadow: none;
        border: 1px solid #ccc;
    }
    
    body {
        background: white;
        color: black;
    }
}

/* ==========================================================================
   Accessibility Enhancements
   ========================================================================== */

/* Focus styles for keyboard navigation */
a:focus,
button:focus,
.nav-link:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Skip to main content link */
.skip-to-main {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--accent-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 1000;
}

.skip-to-main:focus {
    top: 6px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #666;
        --shadow: 0 4px 6px rgba(0, 0, 0, 0.6);
    }
}

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