/* ============================================
   🎨 ALPAY ŞAHIN - PROFESSIONAL DESIGN SYSTEM
   ============================================ */
:root {
    /* 🎨 Color System - Modern Palette */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #f1f5f9;
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #94a3b8;
    --color-border: #e2e8f0;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-primary-glow: rgba(37, 99, 235, 0.15);
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-accent: #8b5cf6;
    
    /* ✨ Shadows & Depth */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-glow: 0 0 40px -10px var(--color-primary-glow);
    
    /* 🔤 Typography */
    --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --text-xs: 0.75rem; --text-sm: 0.875rem; --text-base: 1rem;
    --text-lg: 1.125rem; --text-xl: 1.25rem; --text-2xl: 1.5rem;
    --text-3xl: 1.875rem; --text-4xl: 2.25rem; --text-5xl: 3rem;
    --leading-tight: 1.25; --leading-normal: 1.6; --leading-relaxed: 1.75;
    --weight-normal: 400; --weight-medium: 500; --weight-semibold: 600; --weight-bold: 700;
    
    /* 📐 Spacing & Layout */
    --radius-sm: 0.375rem; --radius-md: 0.75rem; --radius-lg: 1rem; --radius-xl: 1.5rem; --radius-full: 9999px;
    --container-max: 1280px; --header-height: 72px;
    
    /* ⚡ Transitions */
    --transition-fast: 150ms ease; --transition-normal: 300ms ease; --transition-slow: 500ms ease;
}

/* 🌙 Dark Mode */
[data-theme="dark"] {
    --color-bg-primary: #0f172a; --color-bg-secondary: #1e293b; --color-bg-tertiary: #334155;
    --color-text-primary: #f8fafc; --color-text-secondary: #cbd5e1; --color-text-muted: #64748b;
    --color-border: #334155; --color-primary: #3b82f6; --color-primary-hover: #60a5fa;
    --color-primary-glow: rgba(59, 130, 246, 0.25);
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5), 0 4px 6px -4px rgb(0 0 0 / 0.4);
}

/* 🌍 Base Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    font-family: var(--font-sans); background: var(--color-bg-primary); color: var(--color-text-primary);
    line-height: var(--leading-normal); font-size: var(--text-base); font-weight: var(--weight-normal);
    transition: background var(--transition-normal), color var(--transition-normal);
    -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
}
body[dir="rtl"] { font-family: 'Tajawal', 'Segoe UI', sans-serif; }

/* 🔗 Links & Focus */
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-primary-hover); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; border-radius: var(--radius-sm); }

/* 📦 Container */
.container { width: 100%; max-width: var(--container-max); margin: 0 auto; padding: 0 1.5rem; }
@media (min-width: 768px) { .container { padding: 0 2rem; } }
@media (min-width: 1024px) { .container { padding: 0 3rem; } }

/* 🧭 Header */
.site-header {
    position: sticky; top: 0; z-index: 1000; background: rgba(255,255,255,0.85);
    backdrop-filter: saturate(180%) blur(20px); border-bottom: 1px solid var(--color-border);
    transition: background var(--transition-normal), border-color var(--transition-normal);
}
[data-theme="dark"] .site-header { background: rgba(15,23,42,0.85); }
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: var(--header-height); gap: 1rem; }

/* ✨ Logo */
.logo {
    font-size: var(--text-xl); font-weight: var(--weight-bold); color: var(--color-text-primary);
    display: flex; align-items: center; gap: 0.5rem; text-decoration: none;
}
.logo-badge {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: #fff; font-size: var(--text-xs); font-weight: var(--weight-semibold);
    padding: 0.2rem 0.5rem; border-radius: var(--radius-sm);
}

/* 🧭 Navigation */
.main-nav ul { display: flex; gap: 0.25rem; list-style: none; }
.nav-link {
    padding: 0.6rem 1rem; border-radius: var(--radius-md); font-weight: var(--weight-medium);
    color: var(--color-text-secondary); position: relative; transition: all var(--transition-fast);
}
.nav-link:hover, .nav-link.active { color: var(--color-primary); background: var(--color-primary-glow); }
.nav-link.active::after {
    content: ''; position: absolute; bottom: -2px; left: 50%; transform: translateX(-50%);
    width: 20px; height: 2px; background: var(--color-primary); border-radius: var(--radius-full);
}

/* 🎛️ Header Actions */
.header-actions { display: flex; align-items: center; gap: 0.5rem; }
.icon-btn {
    background: var(--color-bg-tertiary); border: 1px solid var(--color-border);
    width: 40px; height: 40px; border-radius: var(--radius-md); display: flex;
    align-items: center; justify-content: center; cursor: pointer; transition: all var(--transition-fast);
    color: var(--color-text-secondary); font-size: 1.1rem;
}
.icon-btn:hover { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
#lang-switcher {
    padding: 0.5rem 0.75rem; border: 1px solid var(--color-border); border-radius: var(--radius-md);
    background: var(--color-bg-tertiary); color: var(--color-text-primary); font-size: var(--text-sm);
    cursor: pointer; transition: all var(--transition-fast);
}
#lang-switcher:hover { border-color: var(--color-primary); }

/* 🍔 Hamburger Menu */
.hamburger { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 0.5rem; }
.hamburger span { width: 24px; height: 2px; background: var(--color-text-primary); border-radius: 2px; transition: var(--transition-fast); }
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* 📱 Responsive Nav */
@media (max-width: 900px) {
    .hamburger { display: flex; }
    .main-nav {
        position: fixed; top: var(--header-height); left: 0; right: 0; background: var(--color-bg-primary);
        border-bottom: 1px solid var(--color-border); padding: 1rem 1.5rem; transform: translateY(-150%);
        transition: transform var(--transition-normal); box-shadow: var(--shadow-lg);
    }
    .main-nav.active { transform: translateY(0); }
    .main-nav ul { flex-direction: column; gap: 0.5rem; }
    .nav-link { padding: 0.75rem 1rem; display: block; }
    .header-actions { order: 3; width: 100%; justify-content: flex-end; margin-top: 0.5rem; }
}

/* 🎴 Hero Section */
.hero { padding: 4rem 0 3rem; text-align: center; }
.hero-title {
    font-size: var(--text-4xl); font-weight: var(--weight-bold); margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--color-text-primary), var(--color-primary));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
@media (min-width: 768px) { .hero-title { font-size: var(--text-5xl); } }
.hero-subtitle { font-size: var(--text-lg); color: var(--color-text-secondary); max-width: 600px; margin: 0 auto 2rem; }
.hero-cta { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* 🎯 Buttons */
.btn {
    display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.75rem 1.5rem;
    background: var(--color-primary); color: #fff; border: none; border-radius: var(--radius-md);
    font-weight: var(--weight-semibold); cursor: pointer; transition: all var(--transition-fast);
    text-decoration: none; font-size: var(--text-sm);
}
.btn:hover { background: var(--color-primary-hover); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-secondary {
    background: var(--color-bg-tertiary); color: var(--color-text-primary); border: 1px solid var(--color-border);
}
.btn-secondary:hover { background: var(--color-border); }
.btn-outline { background: transparent; border: 2px solid var(--color-primary); color: var(--color-primary); }
.btn-outline:hover { background: var(--color-primary); color: #fff; }

/* 📦 Cards */
.card {
    background: var(--color-bg-secondary); border: 1px solid var(--color-border);
    border-radius: var(--radius-lg); padding: 1.5rem; margin-bottom: 1.5rem;
    transition: all var(--transition-normal); box-shadow: var(--shadow-sm);
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--color-primary); }
.card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; padding-bottom: 1rem; border-bottom: 1px solid var(--color-border); }
.card-title { font-size: var(--text-lg); font-weight: var(--weight-semibold); }

/* 📝 Forms */
.form-grid { display: grid; gap: 1rem; }
@media (min-width: 640px) { .form-grid { grid-template-columns: 1fr 1fr; } }
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.4rem; font-weight: var(--weight-medium); font-size: var(--text-sm); color: var(--color-text-secondary); }
.form-control {
    width: 100%; padding: 0.75rem 1rem; border: 1px solid var(--color-border);
    border-radius: var(--radius-md); background: var(--color-bg-primary); color: var(--color-text-primary);
    font-size: var(--text-base); transition: all var(--transition-fast);
}
.form-control:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-primary-glow); outline: none; }
textarea.form-control { min-height: 120px; resize: vertical; font-family: var(--font-sans); }

/* 📊 Stats Grid */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 1rem; margin: 2rem 0; }
.stat-card {
    background: var(--color-bg-secondary); border: 1px solid var(--color-border);
    border-radius: var(--radius-lg); padding: 1.25rem; text-align: center; transition: var(--transition-normal);
}
.stat-card:hover { border-color: var(--color-primary); }
.stat-value { font-size: var(--text-2xl); font-weight: var(--weight-bold); color: var(--color-primary); }
.stat-label { font-size: var(--text-sm); color: var(--color-text-muted); margin-top: 0.25rem; }

/* 📰 Blog Grid */
.blog-grid { display: grid; gap: 1.5rem; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.post-card { display: flex; flex-direction: column; height: 100%; }
.post-image {
    aspect-ratio: 16/9; border-radius: var(--radius-md); background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    margin-bottom: 1rem; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 2rem;
}
.post-meta { display: flex; gap: 1rem; font-size: var(--text-xs); color: var(--color-text-muted); margin-bottom: 0.75rem; }
.post-title { font-size: var(--text-lg); font-weight: var(--weight-semibold); margin-bottom: 0.5rem; }
.post-excerpt { color: var(--color-text-secondary); font-size: var(--text-sm); flex-grow: 1; }

/* 🎬 Vlog Grid */
.video-grid { display: grid; gap: 1.5rem; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.video-card { position: relative; border-radius: var(--radius-lg); overflow: hidden; aspect-ratio: 16/9; background: var(--color-bg-tertiary); }
.video-thumbnail {
    position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, #6366f1, #8b5cf6); color: #fff; font-size: 3rem;
}
.video-play {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    width: 60px; height: 60px; border-radius: 50%; background: rgba(255,255,255,0.95);
    display: flex; align-items: center; justify-content: center; color: var(--color-primary);
    font-size: 1.5rem; box-shadow: var(--shadow-lg); cursor: pointer; transition: var(--transition-fast);
}
.video-play:hover { transform: translate(-50%, -50%) scale(1.1); }
.video-info { position: absolute; bottom: 0; left: 0; right: 0; padding: 1rem; background: linear-gradient(transparent, rgba(0,0,0,0.7)); color: #fff; }

/* 📬 Contact */
.contact-wrapper { display: grid; gap: 2rem; grid-template-columns: 1fr; }
@media (min-width: 900px) { .contact-wrapper { grid-template-columns: 1fr 1.5fr; } }
.contact-info { display: flex; flex-direction: column; gap: 1.5rem; }
.contact-item { display: flex; gap: 1rem; align-items: flex-start; }
.contact-icon {
    width: 48px; height: 48px; border-radius: var(--radius-md); background: var(--color-primary-glow);
    display: flex; align-items: center; justify-content: center; color: var(--color-primary); font-size: 1.25rem; flex-shrink: 0;
}

/* 🦶 Footer */
.site-footer {
    border-top: 1px solid var(--color-border); padding: 2.5rem 0 1.5rem; margin-top: 4rem;
    background: var(--color-bg-secondary);
}
.footer-grid { display: grid; gap: 2rem; grid-template-columns: 1fr; text-align: center; }
@media (min-width: 640px) { .footer-grid { grid-template-columns: 2fr 1fr 1fr; text-align: start; } }
.footer-brand p { color: var(--color-text-muted); font-size: var(--text-sm); margin-top: 0.5rem; }
.footer-links h4 { font-weight: var(--weight-semibold); margin-bottom: 1rem; font-size: var(--text-sm); }
.footer-links a { display: block; padding: 0.25rem 0; color: var(--color-text-secondary); font-size: var(--text-sm); }
.footer-links a:hover { color: var(--color-primary); }
.footer-bottom {
    text-align: center; padding-top: 1.5rem; margin-top: 2rem; border-top: 1px solid var(--color-border);
    color: var(--color-text-muted); font-size: var(--text-xs);
}

/* ✨ Animations */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.animate-fade-in { animation: fadeInUp 0.5s ease forwards; }
.animate-fade-in:nth-child(2) { animation-delay: 0.1s; }
.animate-fade-in:nth-child(3) { animation-delay: 0.2s; }

/* ♿ Accessibility */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
.skip-link {
    position: absolute; top: -40px; left: 0; background: var(--color-primary); color: #fff;
    padding: 0.5rem 1rem; z-index: 1001; transition: top var(--transition-fast);
}
.skip-link:focus { top: 0; }

/* 🎨 Print */
@media print {
    .site-header, .site-footer, .no-print { display: none !important; }
    body { background: #fff; color: #000; font-size: 12pt; }
    a { text-decoration: underline; color: #000; }
}