/* ========================================
   KOLTEK WEB SİTESİ - ANA STIL DOSYASI
   ======================================== */

/* CSS Variables - Marka Renkleri ve Temalar */
:root {
    /* Ana Renkler */
    --color-primary: #1a3a5c;          /* Lacivert - Güven */
    --color-primary-dark: #0f2844;
    --color-primary-light: #2a4a6c;
    --color-secondary: #c19b5f;        /* Altın - Sürdürülebilirlik */
    --color-accent: #c19b5f;           /* Altın - 37. Yıl Vurgusu */
    --color-dark: #2c3e50;
    --color-light: #f8f9fa;
    --color-white: #ffffff;
    --color-gray: #6c757d;
    --color-gray-light: #e9ecef;
    
    /* Typography */
    --font-primary: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-secondary: 'Open Sans', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.15);
    --shadow-lg: 0 8px 16px rgba(0,0,0,0.2);
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
}

/* ========================================
   BASE STYLES
   ======================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-dark);
    background-color: var(--color-white);
    overflow-x: hidden;
}

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

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-sm);
}

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

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

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

/* ========================================
   UTILITY CLASSES
   ======================================== */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.section-padding {
    padding: var(--spacing-xl) 0;
}

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }

.bg-light {
    background-color: var(--color-light);
}

.bg-dark {
    background-color: var(--color-dark);
    color: var(--color-white);
}

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

/* ========================================
   BUTTONS
   ======================================== */

.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent) 0%, #d4af6a 100%);
    color: var(--color-primary);
    border-color: var(--color-accent);
    box-shadow: 0 4px 15px rgba(193, 155, 95, 0.4);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #d4af6a 0%, var(--color-accent) 100%);
    border-color: #d4af6a;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(193, 155, 95, 0.6);
    color: var(--color-primary-dark);
}

.btn-secondary {
    background-color: rgba(255, 255, 255, 0.15);
    color: var(--color-white);
    border: 2px solid rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.95);
    color: var(--color-primary);
    border-color: var(--color-white);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(255, 255, 255, 0.4);
}

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 1.125rem;
}

.btn-sm {
    padding: 0.5rem 1.5rem;
    font-size: 0.875rem;
}

/* ========================================
   SECTION HEADERS
   ======================================== */

.section-header {
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background-color: var(--color-accent);
    margin: var(--spacing-sm) auto 0;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--color-gray);
    font-weight: 400;
}

/* ========================================
   ANIMATIONS
   ======================================== */

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.animate-fade-in {
    animation: fadeIn 1s ease-out;
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   BACK TO TOP BUTTON
   ======================================== */

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--color-primary);
    color: var(--color-white);
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 999;
    box-shadow: var(--shadow-md);
}

.back-to-top:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-5px);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

/* ========================================
   LOADING SPINNER
   ======================================== */

.spinner {
    border: 4px solid var(--color-gray-light);
    border-top: 4px solid var(--color-primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ========================================
   FORMS - Modern & Beautiful
   ======================================== */

.form-group {
    margin-bottom: 1.5rem;
    position: relative;
}

.form-label,
.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--color-primary);
    font-size: 0.95rem;
    transition: var(--transition-fast);
}

.form-control,
.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group input[type="number"],
.form-group input[type="file"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 1rem 1.25rem;
    font-size: 1rem;
    font-family: var(--font-primary);
    border: 2px solid #e8ecef;
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
    background: #f8f9fa;
    color: var(--color-dark);
}

.form-control:focus,
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--color-white);
    box-shadow: 0 0 0 4px rgba(26, 58, 92, 0.1);
    transform: translateY(-1px);
}

.form-control::placeholder,
.form-group input::placeholder,
.form-group textarea::placeholder {
    color: #a0a8b0;
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%231a3a5c' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 3rem;
}

textarea.form-control,
.form-group textarea {
    min-height: 120px;
    resize: vertical;
    line-height: 1.6;
}

.form-group input[type="file"] {
    padding: 0.75rem 1rem;
    cursor: pointer;
    font-size: 0.95rem;
}

.form-group input[type="file"]::file-selector-button {
    padding: 0.5rem 1rem;
    border: none;
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-sm);
    cursor: pointer;
    margin-right: 1rem;
    transition: var(--transition-fast);
}

.form-group input[type="file"]::file-selector-button:hover {
    background: var(--color-primary-dark);
}

/* Checkbox & Radio Styling */
.form-group input[type="checkbox"],
.form-group input[type="radio"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--color-primary);
}

.checkbox-label,
.radio-label {
    display: flex;
    align-items: start;
    gap: 0.75rem;
    cursor: pointer;
    user-select: none;
}

.checkbox-label input,
.radio-label input {
    margin-top: 2px;
    flex-shrink: 0;
}

.checkbox-label span,
.radio-label span {
    line-height: 1.6;
    color: var(--color-gray);
}

/* Form Validation States */
.form-control.error,
.form-group input.error,
.form-group select.error,
.form-group textarea.error {
    border-color: #dc3545;
    background: #fff5f5;
}

.form-control.success,
.form-group input.success,
.form-group select.success,
.form-group textarea.success {
    border-color: var(--color-secondary);
    background: #f0fff4;
}

.form-error {
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 0.25rem;
    display: block;
}

.form-success {
    color: var(--color-secondary);
    font-size: 0.875rem;
    margin-top: 0.25rem;
    display: block;
}

/* Form Grid Layout */
.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .form-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   CARDS
   ======================================== */

.card {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.card-image {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

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

.card-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.card-text {
    color: var(--color-gray);
    margin-bottom: var(--spacing-sm);
}

/* ========================================
   GRID SYSTEMS
   ======================================== */

.grid {
    display: grid;
    gap: var(--spacing-md);
}

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

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

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

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

/* Tablet */
@media (max-width: 992px) {
    html {
        font-size: 15px;
    }
    
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.75rem; }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .grid-3,
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .section-padding {
        padding: var(--spacing-lg) 0;
    }
}

/* Mobile */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .btn {
        padding: 0.625rem 1.5rem;
        font-size: 0.9rem;
    }
    
    .back-to-top {
        width: 45px;
        height: 45px;
        bottom: 20px;
        right: 20px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .section-padding {
        padding: var(--spacing-md) 0;
    }
}

/* ========================================
   ACCESSIBILITY
   ======================================== */

/* Skip to main content link */
.skip-to-main {
    position: absolute;
    left: -9999px;
    z-index: 9999;
    padding: 1rem;
    background-color: var(--color-primary);
    color: var(--color-white);
    text-decoration: none;
}

.skip-to-main:focus {
    left: 0;
}

/* Focus visible for keyboard navigation */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-primary: #000080;
        --color-secondary: #006400;
    }
}

/* 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;
    }
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
    .main-header,
    .main-footer,
    .back-to-top,
    .cta-section {
        display: none;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
    }
    
    h1 { font-size: 24pt; }
    h2 { font-size: 20pt; }
    h3 { font-size: 16pt; }
    
    a {
        color: #000;
        text-decoration: underline;
    }
}