/**
 * OtoBKS.com - Ana Stil Dosyası
 * Modern, Responsive Taşıt Bakım Yönetim Sistemi
 */

/* ==========================================
   ROOT VARIABLES
   ========================================== */
:root {
    /* Renk Paleti */
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary-color: #0891b2;
    --secondary-dark: #0e7490;
    --accent-color: #f59e0b;
    --accent-dark: #d97706;
    
    /* Nötr Renkler */
    --dark: #1e293b;
    --dark-light: #334155;
    --light: #f1f5f9;
    --light-dark: #e2e8f0;
    --white: #ffffff;
    
    /* Durum Renkleri */
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #06b6d4;
    
    /* Gölgeler */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Tipografi */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Poppins', var(--font-primary);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-base: all 0.3s ease;
    --transition-fast: all 0.15s ease;
}

/* ==========================================
   GLOBAL STYLES
   ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--dark);
    background-color: var(--white);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    color: var(--dark);
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

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

a:hover {
    color: var(--primary-dark);
    text-decoration: none;
}

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

/* ==========================================
   UTILITY CLASSES
   ========================================== */
.text-primary { color: var(--primary-color) !important; }
.text-secondary { color: var(--secondary-color) !important; }
.text-accent { color: var(--accent-color) !important; }
.text-dark { color: var(--dark) !important; }

.bg-primary { background-color: var(--primary-color) !important; }
.bg-secondary { background-color: var(--secondary-color) !important; }
.bg-light { background-color: var(--light) !important; }
.bg-dark { background-color: var(--dark) !important; }

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

.section-padding-lg {
    padding: 5rem 0;
}

/* ==========================================
   BUTTONS
   ========================================== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    font-size: 1rem;
    text-align: center;
    border-radius: var(--radius-md);
    transition: var(--transition-base);
    cursor: pointer;
    border: 2px solid transparent;
}

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

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

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

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

.btn-accent {
    background: var(--accent-color);
    color: var(--white);
    border-color: var(--accent-color);
}

.btn-accent:hover {
    background: var(--accent-dark);
    border-color: var(--accent-dark);
    color: var(--white);
    transform: translateY(-2px);
}

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

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

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* ==========================================
   NAVBAR
   ========================================== */
.navbar-custom {
    background: var(--white);
    box-shadow: var(--shadow-md);
    padding: 1rem 0;
    transition: var(--transition-base);
}

.navbar-custom.scrolled {
    padding: 0.5rem 0;
    box-shadow: var(--shadow-lg);
}

.navbar-brand {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color) !important;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-brand:hover {
    color: var(--primary-dark) !important;
}

.navbar-nav .nav-link {
    color: var(--dark);
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    position: relative;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    color: var(--primary-color);
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition-base);
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after {
    width: 80%;
}

/* ==========================================
   HERO SECTION
   ========================================== */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 6rem 0 4rem;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--white);
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
    animation: fadeInUp 1s ease;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    animation: fadeInUp 1.2s ease;
}

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

/* ==========================================
   SECTIONS
   ========================================== */
.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

/* ==========================================
   ARTICLE / DETAIL STYLES
   ========================================== */
.article-hero-section .article-hero {
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: grid;
    grid-template-columns: 1fr;
    background: var(--white);
}
.article-hero-media {
    background-size: cover;
    background-position: center;
    height: 320px;
    filter: saturate(1.05) contrast(0.98);
}
@media(min-width:992px){
    .article-hero { grid-template-columns: 1fr 1.2fr; }
    .article-hero-media { height: auto; min-height: 360px; }
}
.hero-article-title { font-size: 2rem; color: var(--dark); margin-bottom: .5rem; }
.article-content { color: var(--dark-light); font-size: 1.05rem; line-height: 1.85; }
.article-content img { border-radius: .5rem; box-shadow: var(--shadow-sm); margin: 1rem 0; }
.tag-list .tag { border-radius: 999px; padding: .35rem .7rem; font-size: .85rem; }
.share-buttons a { width: 38px; height: 38px; display: inline-flex; align-items: center; justify-content: center; border-radius: 8px; }
.related-posts .card { transition: transform .25s ease, box-shadow .25s ease; }
.related-posts .card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.author-box { display:flex; gap:1rem; align-items:center; padding: .75rem; border-radius: .5rem; background: linear-gradient(90deg, rgba(2,6,23,0.02), rgba(255,255,255,0.02)); box-shadow: var(--shadow-sm); margin-top: 1.5rem; }
.author-box img { width:56px; height:56px; border-radius:50%; object-fit:cover; }
.author-box .meta { font-size: .95rem; color: var(--dark-light); }

.section-title h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--accent-color);
    border-radius: 2px;
}

.section-title p {
    font-size: 1.125rem;
    color: var(--dark-light);
    max-width: 600px;
    margin: var(--spacing-md) auto 0;
}

/* ==========================================
   FOOTER
   ========================================== */
.footer {
    background: var(--dark);
    color: var(--light);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer h5 {
    color: var(--white);
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}

.footer a {
    color: var(--light);
    transition: var(--transition-base);
}

.footer a:hover {
    color: var(--primary-light);
    padding-left: 5px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-lg);
    text-align: center;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--white);
    transition: var(--transition-base);
}

.social-links a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
    padding-left: 0;
}

/* ==========================================
   SCROLL TO TOP
   ========================================== */
.scroll-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 45px;
    height: 45px;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
    z-index: 999;
    box-shadow: var(--shadow-lg);
}

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

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

/* ==========================================
   ANIMATIONS
   ========================================== */
.fade-in {
    animation: fadeIn 0.6s ease;
}

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

.slide-up {
    animation: slideUp 0.6s ease;
}

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