/* Oto Sanayicileri — Kurumsal Portal CSS */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600;700&family=Source+Sans+3:wght@400;500;600;700&display=swap');

:root {
  --navy-950: #0f1729;
  --navy-900: #1b2a4a;
  --navy-800: #243656;
  --slate-50: #f8f9fb;
  --slate-100: #f4f5f7;
  --slate-200: #e5e7eb;
  --slate-300: #d1d5db;
  --slate-500: #6b7280;
  --slate-600: #4b5563;
  --slate-700: #374151;
  --slate-800: #1f2937;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --warning: #b45309;
  --font-sans: 'Source Sans 3', system-ui, sans-serif;
  --font-display: 'IBM Plex Sans', system-ui, sans-serif;
  --max-width: 72rem;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--slate-800);
  background: #fff;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { font-family: var(--font-display); color: var(--navy-900); font-weight: 600; line-height: 1.25; }
h1 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.375rem, 3vw, 1.875rem); }
h3 { font-size: 1.125rem; }
a { color: var(--accent); text-decoration: none; transition: color 0.15s; }
a:hover { color: var(--accent-hover); }
img { max-width: 100%; height: auto; display: block; }

.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 1rem; }
@media (min-width: 640px) { .container { padding: 0 1.5rem; } }
.section { padding: 3rem 0; }
@media (min-width: 768px) { .section { padding: 4rem 0; } }
.section-alt { background: var(--slate-50); }

/* Top bar */
.top-bar { background: var(--slate-50); border-bottom: 1px solid var(--slate-200); font-size: 0.75rem; color: var(--slate-600); }
.top-bar .container { display: flex; justify-content: flex-end; gap: 1.5rem; padding-top: 0.375rem; padding-bottom: 0.375rem; }
.top-bar a { color: var(--slate-600); }
.top-bar a:hover { color: var(--navy-900); }

/* Header */
.site-header { background: #fff; border-bottom: 1px solid var(--slate-200); position: sticky; top: 0; z-index: 100; box-shadow: 0 1px 2px rgba(0,0,0,.04); }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 1rem 0; gap: 1rem; }
.logo { display: flex; align-items: center; gap: 0.75rem; color: var(--navy-900); }
.logo:hover { color: var(--navy-900); }
.logo-mark { width: 2.5rem; height: 2.5rem; background: var(--navy-900); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 0.875rem; flex-shrink: 0; }
.logo-text { font-family: var(--font-display); font-weight: 700; font-size: 1rem; line-height: 1.2; }
@media (min-width: 768px) { .logo-text { font-size: 1.125rem; } }

.main-nav { display: none; align-items: center; gap: 0.25rem; }
@media (min-width: 1024px) { .main-nav { display: flex; } }
.main-nav a { padding: 0.5rem 0.75rem; font-size: 0.875rem; font-weight: 500; color: var(--slate-700); border-radius: 2px; }
.main-nav a:hover, .main-nav a.active { color: var(--accent); }
.nav-dropdown { position: relative; }
.nav-dropdown-menu { display: none; position: absolute; top: 100%; left: 0; min-width: 200px; background: #fff; border: 1px solid var(--slate-200); box-shadow: 0 4px 12px rgba(0,0,0,.08); z-index: 50; }
.nav-dropdown:hover .nav-dropdown-menu { display: block; }
.nav-dropdown-menu a { display: block; padding: 0.5rem 1rem; font-size: 0.875rem; }
.nav-dropdown-menu a:hover { background: var(--slate-50); }

.header-actions { display: flex; align-items: center; gap: 0.75rem; }
.menu-toggle { display: flex; padding: 0.5rem; background: none; border: none; cursor: pointer; color: var(--slate-700); }
@media (min-width: 1024px) { .menu-toggle { display: none; } }
.mobile-nav { display: none; border-top: 1px solid var(--slate-200); padding: 1rem 0; }
.mobile-nav.open { display: block; }
@media (min-width: 1024px) { .mobile-nav { display: none !important; } }
.mobile-nav a { display: block; padding: 0.625rem 0; font-size: 0.875rem; font-weight: 500; color: var(--slate-700); }
.mobile-nav a.active { color: var(--accent); }
.mobile-nav .sub { padding-left: 1rem; font-weight: 400; color: var(--slate-600); }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; padding: 0.625rem 1.25rem; font-size: 0.875rem; font-weight: 600; border-radius: 2px; border: none; cursor: pointer; transition: background 0.15s, color 0.15s; font-family: inherit; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); color: #fff; }
.btn-outline { background: transparent; color: #fff; border: 2px solid #fff; }
.btn-outline:hover { background: rgba(255,255,255,.1); color: #fff; }
.btn-secondary { background: #fff; color: var(--navy-900); border: 1px solid var(--slate-300); }
.btn-secondary:hover { background: var(--slate-50); color: var(--navy-900); }

/* Hero */
.hero { background: var(--navy-900); color: #fff; padding: 4rem 0; }
@media (min-width: 768px) { .hero { padding: 5rem 0 6rem; } }
.hero-label { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--slate-300); margin-bottom: 0.75rem; }
.hero h1 { color: #fff; margin-bottom: 1rem; }
.hero-desc { font-size: 1.125rem; color: var(--slate-300); max-width: 40rem; line-height: 1.7; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 2rem; }

.page-hero { background: var(--navy-900); color: #fff; padding: 2.5rem 0; }
.page-hero h1 { color: #fff; font-size: clamp(1.5rem, 3vw, 2.25rem); }
.page-hero-desc { color: var(--slate-300); margin-top: 0.5rem; max-width: 40rem; }

/* Cards & blocks */
.content-block { background: #fff; border: 1px solid var(--slate-200); }
.card-grid { display: grid; gap: 1.25rem; }
@media (min-width: 640px) { .card-grid-2 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 768px) { .card-grid-3 { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1024px) { .card-grid-4 { grid-template-columns: repeat(4, 1fr); } }

.category-card { padding: 1.5rem; transition: box-shadow 0.15s; color: inherit; display: block; }
.category-card:hover { box-shadow: 0 4px 12px rgba(0,0,0,.08); color: inherit; }
.category-icon { width: 2.5rem; height: 2.5rem; background: var(--navy-900); color: #fff; display: flex; align-items: center; justify-content: center; margin-bottom: 1rem; font-size: 1.125rem; }
.category-card h3 { margin-bottom: 0.5rem; }
.category-card p { font-size: 0.875rem; color: var(--slate-600); line-height: 1.6; }
.category-link { display: inline-block; margin-top: 1rem; font-size: 0.875rem; font-weight: 600; color: var(--accent); }

.project-item { padding: 1.25rem; transition: box-shadow 0.15s; }
.project-item:hover { box-shadow: 0 2px 8px rgba(0,0,0,.06); }
.project-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; margin-bottom: 0.5rem; }
.news-item { padding: 1.25rem 0; border-bottom: 1px solid var(--slate-200); }
.news-item:last-child { border-bottom: none; }
.news-date { font-size: 0.75rem; color: var(--slate-500); }
.news-item h3 { margin: 0.25rem 0; font-size: 1.125rem; }
.news-item h3 a { color: var(--navy-900); }
.news-item h3 a:hover { color: var(--accent); }
.news-excerpt { font-size: 0.875rem; color: var(--slate-600); }

.status-badge { display: inline-block; padding: 0.125rem 0.5rem; font-size: 0.75rem; font-weight: 500; border-radius: 2px; border: 1px solid; }
.status-planning { background: #fffbeb; color: #92400e; border-color: #fde68a; }
.status-active { background: #eff6ff; color: #1e40af; border-color: #bfdbfe; }
.status-done { background: #ecfdf5; color: #065f46; border-color: #a7f3d0; }

.announcement { padding: 1rem; margin-bottom: 0.75rem; }
.announcement.priority-high { border-left: 4px solid var(--warning); }
.announcement h3 { font-size: 1rem; margin-bottom: 0.25rem; }
.announcement p { font-size: 0.875rem; color: var(--slate-600); }
.announcement time { font-size: 0.75rem; color: var(--slate-400); margin-top: 0.5rem; display: block; }

/* Stats */
.stats-bar { background: var(--navy-900); color: #fff; padding: 2.5rem 0; }
.stats-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; text-align: center; }
@media (min-width: 768px) { .stats-grid { grid-template-columns: repeat(4, 1fr); } }
.stat-value { font-family: var(--font-display); font-size: 2rem; font-weight: 700; }
.stat-label { font-size: 0.875rem; color: var(--slate-300); margin-top: 0.25rem; }

/* Chairman */
.chairman-block { display: grid; gap: 2rem; padding: 2rem; }
@media (min-width: 768px) { .chairman-block { grid-template-columns: 1fr 2fr; padding: 2.5rem; } }
.chairman-photo { width: 8rem; height: 8rem; background: var(--navy-900); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 1.75rem; font-weight: 700; margin: 0 auto; }
@media (min-width: 768px) { .chairman-photo { margin: 0; } }
.chairman-info { text-align: center; }
@media (min-width: 768px) { .chairman-info { text-align: left; } }

/* Breadcrumb */
.breadcrumb { font-size: 0.875rem; color: var(--slate-500); margin-bottom: 1.5rem; }
.breadcrumb a { color: var(--slate-500); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { color: var(--slate-700); }

/* Prose */
.prose { max-width: 48rem; line-height: 1.75; }
.prose h2 { margin: 1.5rem 0 0.75rem; font-size: 1.375rem; }
.prose p { margin-bottom: 1rem; color: var(--slate-700); }
.prose ul { margin: 0 0 1rem 1.5rem; color: var(--slate-700); }

/* Section header */
.section-header { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 1rem; margin-bottom: 2rem; }
.section-header p { color: var(--slate-600); margin-top: 0.5rem; }
.section-link { font-size: 0.875rem; font-weight: 600; white-space: nowrap; }

/* Filter tabs */
.filter-tabs { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 2rem; }
.filter-tab { padding: 0.375rem 0.75rem; font-size: 0.875rem; border: 1px solid var(--slate-300); border-radius: 2px; color: var(--slate-600); background: #fff; }
.filter-tab:hover { border-color: var(--navy-900); color: var(--navy-900); }
.filter-tab.active { background: var(--navy-900); color: #fff; border-color: var(--navy-900); }

/* Contact */
.contact-grid { display: grid; gap: 2rem; }
@media (min-width: 1024px) { .contact-grid { grid-template-columns: 2fr 3fr; } }
.contact-info { padding: 1.5rem; }
.contact-info ul { list-style: none; }
.contact-info li { display: flex; gap: 0.75rem; margin-bottom: 1rem; font-size: 0.875rem; color: var(--slate-600); }
.contact-form-wrap { padding: 1.5rem; }
@media (min-width: 768px) { .contact-form-wrap { padding: 2rem; } }

.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-size: 0.875rem; font-weight: 500; color: var(--slate-700); margin-bottom: 0.25rem; }
.form-control { width: 100%; padding: 0.5rem 0.75rem; font-size: 0.875rem; font-family: inherit; border: 1px solid var(--slate-300); border-radius: 2px; }
.form-control:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
textarea.form-control { resize: vertical; min-height: 120px; }
.form-row { display: grid; gap: 1rem; }
@media (min-width: 640px) { .form-row-2 { grid-template-columns: 1fr 1fr; } }
.alert { padding: 0.75rem 1rem; font-size: 0.875rem; border-radius: 2px; margin-bottom: 1rem; }
.alert-success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }

/* Footer */
.site-footer { background: var(--navy-900); color: var(--slate-300); padding: 3rem 0 0; }
.footer-grid { display: grid; gap: 2rem; }
@media (min-width: 768px) { .footer-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .footer-grid { grid-template-columns: repeat(4, 1fr); } }
.footer-col h4 { color: #fff; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 1rem; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 0.5rem; }
.footer-col a { color: var(--slate-300); font-size: 0.875rem; }
.footer-col a:hover { color: #fff; }
.footer-bottom { margin-top: 2.5rem; padding: 1.5rem 0; border-top: 1px solid var(--navy-800); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; font-size: 0.75rem; color: var(--slate-400); }
.footer-legal { display: flex; gap: 1rem; }

/* Two col layout */
.two-col { display: grid; gap: 2rem; align-items: center; }
@media (min-width: 1024px) { .two-col { grid-template-columns: 1fr 1fr; } }
.info-panel { padding: 2rem; background: var(--slate-100); }
.info-row { display: flex; justify-content: space-between; padding: 0.75rem 0; border-bottom: 1px solid var(--slate-200); font-size: 0.875rem; }
.info-row:last-child { border-bottom: none; }
.info-row span:last-child { font-weight: 600; color: var(--navy-900); }

/* Board grid */
.board-grid { display: grid; gap: 1.5rem; }
@media (min-width: 640px) { .board-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .board-grid { grid-template-columns: repeat(3, 1fr); } }
.board-card { padding: 1.5rem; text-align: center; }
.board-avatar { width: 5rem; height: 5rem; background: var(--navy-900); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; margin: 0 auto 1rem; }
.board-title { font-size: 0.875rem; color: var(--accent); font-weight: 500; }

/* 404 */
.error-page { text-align: center; padding: 4rem 0; }
.error-page h1 { font-size: 4rem; color: var(--navy-900); }

/* Utility */
.text-muted { color: var(--slate-600); }
.text-sm { font-size: 0.875rem; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-8 { margin-bottom: 2rem; }
.space-y-4 > * + * { margin-top: 1rem; }