/* =====================================================
   Çankaya Web Tasarım
   Primary: #005E75 | Light / Dark mode
   Tüm metinler her iki temada da okunabilir
   ===================================================== */

:root {
  --primary: #005E75;
  --primary-dark: #004A5C;
  --primary-light: #007A96;
  --primary-lighter: #E6F4F7;
  --accent: #00A3C4;
  --accent-hover: #008CAD;
  --bg-body: #F7FBFC;
  --bg-card: #FFFFFF;
  --bg-navbar: rgba(255, 255, 255, 0.95);
  --bg-footer: #003844;
  --text-main: #1A2B32;
  --text-muted: #4A6270;
  --text-light: #2E4450;
  --text-on-dark: #E8F4F7;
  --text-muted-on-dark: #A8C0CA;
  --text-on-primary: #FFFFFF;
  --border-color: rgba(0, 94, 117, 0.18);
  --border-hover: rgba(0, 94, 117, 0.4);
  --shadow: 0 10px 30px rgba(0, 94, 117, 0.08);
  --shadow-hover: 0 16px 40px rgba(0, 94, 117, 0.14);
  --success: #0D9488;
  --danger: #DC2626;
  --warning: #D97706;
  --radius: 14px;
  --radius-sm: 10px;
  --transition: all 0.25s ease;
  --focus-ring: 0 0 0 3px rgba(0, 163, 196, 0.35);
  --input-bg: #FFFFFF;
  --navbar-toggler-filter: none;
}

[data-theme="dark"] {
  --primary: #2EC4E0;
  --primary-dark: #00A3C4;
  --primary-light: #5CD4EA;
  --primary-lighter: #14323C;
  --accent: #2EC4E0;
  --accent-hover: #5CD4EA;
  --bg-body: #0B1C22;
  --bg-card: #122A33;
  --bg-navbar: rgba(11, 28, 34, 0.95);
  --bg-footer: #071419;
  --text-main: #F0F7F9;
  --text-muted: #A8C0CA;
  --text-light: #D0E0E6;
  --text-on-dark: #F0F7F9;
  --text-muted-on-dark: #A8C0CA;
  --text-on-primary: #0B1C22;
  --border-color: rgba(46, 196, 224, 0.22);
  --border-hover: rgba(46, 196, 224, 0.5);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 16px 40px rgba(0, 0, 0, 0.5);
  --focus-ring: 0 0 0 3px rgba(46, 196, 224, 0.4);
  --input-bg: #0F2430;
  --navbar-toggler-filter: invert(1) grayscale(100%) brightness(200%);
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  color-scheme: light dark;
}

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.65;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

/* Links */
a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}
a:hover { color: var(--accent); }

/* Bootstrap text utility overrides — kritik */
.text-muted,
small.text-muted,
.small.text-muted,
p.text-muted {
  color: var(--text-muted) !important;
}

.text-light {
  color: var(--text-light) !important;
}

.text-dark {
  color: var(--text-main) !important;
}

.text-white {
  color: #fff !important;
}

h1, h2, h3, h4, h5, h6,
.h1, .h2, .h3, .h4, .h5, .h6 {
  color: var(--text-main);
}

p, li, span, label, td, th {
  color: inherit;
}

/* Focus */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--primary);
  color: #fff !important;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-sm);
  z-index: 9999;
  font-weight: 600;
}
.skip-link:focus { top: 1rem; }

/* ---------- Navbar ---------- */
.site-navbar {
  background: var(--bg-navbar) !important;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.7rem 0;
  z-index: 1030;
  transition: var(--transition);
}
.site-navbar.scrolled { box-shadow: var(--shadow); }

.brand {
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: 0.06em;
  color: var(--text-main) !important;
  text-transform: uppercase;
}
.brand span { color: var(--primary) !important; }

.nav-link {
  color: var(--text-muted) !important;
  font-weight: 500;
  font-size: 0.92rem;
  padding: 0.45rem 0.8rem !important;
  border-radius: 8px;
  transition: var(--transition);
}
.nav-link:hover,
.nav-link.active {
  color: var(--primary) !important;
  background: var(--primary-lighter);
}

.navbar-toggler {
  border-color: var(--border-color);
  padding: 0.3rem 0.5rem;
}
.navbar-toggler:focus { box-shadow: var(--focus-ring); }
.navbar-toggler-icon {
  filter: var(--navbar-toggler-filter);
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-main);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}
.theme-toggle:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.theme-toggle i { color: inherit; }

/* ---------- Main ---------- */
.main-content {
  position: relative;
  z-index: 10;
  padding-top: 88px;
  padding-bottom: 3rem;
  min-height: calc(100vh - 300px);
  color: var(--text-main);
}

/* ---------- Buttons ---------- */
.btn-accent {
  background: var(--primary);
  color: #fff !important;
  border: none;
  font-weight: 600;
  padding: 0.7rem 1.6rem;
  border-radius: 50px;
  transition: var(--transition);
  font-size: 0.92rem;
}
.btn-accent:hover,
.btn-accent:focus {
  background: var(--accent-hover);
  color: #fff !important;
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(0, 94, 117, 0.3);
}
.btn-accent i { color: #fff !important; }

.btn-outline-accent {
  background: transparent;
  color: var(--primary) !important;
  border: 2px solid var(--primary);
  font-weight: 600;
  padding: 0.6rem 1.5rem;
  border-radius: 50px;
  transition: var(--transition);
}
.btn-outline-accent:hover,
.btn-outline-accent:focus {
  background: var(--primary);
  color: #fff !important;
  transform: translateY(-2px);
}
.btn-outline-accent:hover i,
.btn-outline-accent:focus i { color: #fff !important; }

.btn-sm { padding: 0.4rem 1.1rem; font-size: 0.85rem; }

.btn-outline-danger {
  color: var(--danger) !important;
  border-color: var(--danger);
}
.btn-outline-danger:hover {
  background: var(--danger);
  color: #fff !important;
}

/* ---------- Cards ---------- */
.card-custom {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.6rem;
  height: 100%;
  transition: var(--transition);
  box-shadow: var(--shadow);
  color: var(--text-main);
}
.card-custom:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover);
}
.card-custom h1,
.card-custom h2,
.card-custom h3,
.card-custom h4,
.card-custom h5,
.card-custom h6,
.card-custom p,
.card-custom span,
.card-custom strong {
  color: inherit;
}
.card-custom .text-muted {
  color: var(--text-muted) !important;
}

.card-icon {
  width: 52px;
  height: 52px;
  background: var(--primary-lighter);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  color: var(--primary);
  margin-bottom: 1rem;
}
.card-icon i { color: var(--primary); }

.card-custom.no-pad { padding: 0; overflow: hidden; }
.card-custom.no-pad .card-body {
  padding: 1.4rem;
  color: var(--text-main);
}

/* ---------- Sections ---------- */
.section-title {
  font-weight: 700;
  font-size: clamp(1.55rem, 4vw, 2.15rem);
  margin-bottom: 0.6rem;
  color: var(--text-main) !important;
}
.section-subtitle {
  color: var(--text-muted) !important;
  font-size: 1.05rem;
  max-width: 580px;
  margin-bottom: 2.2rem;
}

.hero { padding: 3.5rem 0 2.5rem; text-align: center; }
.hero h1 {
  font-weight: 800;
  font-size: clamp(1.9rem, 5vw, 2.9rem);
  margin-bottom: 1rem;
  line-height: 1.25;
  color: var(--text-main) !important;
}
.hero h1 .highlight { color: var(--primary) !important; }
.hero p {
  color: var(--text-muted) !important;
  font-size: 1.12rem;
  max-width: 620px;
  margin: 0 auto 1.8rem;
}

.page-header {
  text-align: center;
  padding: 2.2rem 0 1.3rem;
  margin-bottom: 1.8rem;
}
.page-header h1 {
  font-weight: 700;
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  margin-bottom: 0.4rem;
  color: var(--text-main) !important;
}
.page-header p {
  color: var(--text-muted) !important;
  max-width: 540px;
  margin: 0 auto;
}

/* ---------- Content box ---------- */
.content-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  color: var(--text-main);
}
.content-box h2 {
  font-size: 1.3rem;
  margin-top: 1.4rem;
  margin-bottom: 0.7rem;
  color: var(--text-main) !important;
}
.content-box p {
  color: var(--text-light) !important;
  margin-bottom: 0.9rem;
}
.content-box li { color: var(--text-light); }

/* ---------- Images & badges ---------- */
.project-img,
.ref-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius) var(--radius) 0 0;
  background: var(--primary-lighter);
}

.badge-category {
  background: var(--primary-lighter);
  color: var(--primary) !important;
  font-weight: 500;
  font-size: 0.75rem;
  padding: 0.28rem 0.7rem;
  border-radius: 50px;
}

/* ---------- Forms ---------- */
.form-control,
.form-select {
  background: var(--input-bg) !important;
  border: 1px solid var(--border-color);
  color: var(--text-main) !important;
  border-radius: var(--radius-sm);
  padding: 0.7rem 1rem;
}
.form-control:focus,
.form-select:focus {
  background: var(--input-bg) !important;
  border-color: var(--primary);
  color: var(--text-main) !important;
  box-shadow: var(--focus-ring);
}
.form-control::placeholder {
  color: var(--text-muted) !important;
  opacity: 0.85;
}
.form-label {
  color: var(--text-light) !important;
  font-weight: 500;
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
}

/* ---------- Alerts ---------- */
.alert-custom {
  border-radius: var(--radius-sm);
  border: none;
  padding: 1rem 1.2rem;
}
.alert-success {
  background: rgba(13, 148, 136, 0.15);
  color: var(--success) !important;
}
.alert-danger {
  background: rgba(220, 38, 38, 0.12);
  color: var(--danger) !important;
}
[data-theme="dark"] .alert-success {
  background: rgba(13, 148, 136, 0.2);
  color: #5eead4 !important;
}
[data-theme="dark"] .alert-danger {
  background: rgba(220, 38, 38, 0.2);
  color: #fca5a5 !important;
}

/* ---------- Footer (her zaman koyu zemin) ---------- */
.site-footer {
  background: var(--bg-footer);
  color: var(--text-muted-on-dark);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 3.2rem 0 1.4rem;
  margin-top: 3rem;
}
.site-footer .brand { color: #fff !important; }
.site-footer .brand span { color: var(--accent) !important; }
.footer-title {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 1rem;
  color: #fff !important;
}
.footer-desc {
  color: var(--text-muted-on-dark) !important;
  font-size: 0.9rem;
  line-height: 1.7;
}
.footer-links { list-style: none; padding: 0; }
.footer-links li { margin-bottom: 0.4rem; }
.footer-links a {
  color: var(--text-muted-on-dark) !important;
  font-size: 0.9rem;
}
.footer-links a:hover { color: var(--accent) !important; }
.footer-contact { list-style: none; padding: 0; }
.footer-contact li {
  display: flex;
  gap: 0.55rem;
  margin-bottom: 0.65rem;
  font-size: 0.88rem;
  color: var(--text-muted-on-dark) !important;
}
.footer-contact i {
  color: var(--accent) !important;
  margin-top: 0.15rem;
  flex-shrink: 0;
}
.footer-contact a {
  color: var(--text-muted-on-dark) !important;
}
.footer-contact a:hover { color: var(--accent) !important; }
.footer-contact span { color: var(--text-muted-on-dark) !important; }
.footer-divider {
  border-color: rgba(255, 255, 255, 0.1);
  margin: 1.8rem 0 1.2rem;
}
.site-footer .small {
  color: var(--text-muted-on-dark) !important;
}

/* ---------- Admin ---------- */
.admin-body { background: var(--bg-body); color: var(--text-main); }
.admin-sidebar {
  background: var(--bg-card);
  border-right: 1px solid var(--border-color);
  min-height: 100vh;
}
.admin-sidebar .nav-link {
  color: var(--text-muted) !important;
  border-radius: 8px;
  margin-bottom: 0.2rem;
}
.admin-sidebar .nav-link:hover,
.admin-sidebar .nav-link.active {
  background: var(--primary-lighter);
  color: var(--primary) !important;
}
.admin-sidebar .brand { color: var(--text-main) !important; }
.admin-sidebar .text-muted { color: var(--text-muted) !important; }

.table-dark-custom {
  --bs-table-bg: transparent;
  --bs-table-color: var(--text-main);
  --bs-table-border-color: var(--border-color);
  --bs-table-striped-bg: var(--primary-lighter);
  --bs-table-hover-bg: var(--primary-lighter);
  color: var(--text-main);
}
.table-dark-custom th {
  font-weight: 600;
  color: var(--text-light) !important;
  border-bottom-color: var(--border-color);
}
.table-dark-custom td {
  color: var(--text-main) !important;
  border-color: var(--border-color);
}
.table-dark-custom a { color: var(--primary); }

.badge.bg-success { background-color: var(--success) !important; color: #fff !important; }
.badge.bg-secondary { background-color: #6b7280 !important; color: #fff !important; }
.badge.bg-warning { color: #1a1a1a !important; }

/* ---------- Utilities ---------- */
.text-accent { color: var(--primary) !important; }
.bg-primary-light { background: var(--primary-lighter) !important; }

/* Bootstrap border helpers in dark mode */
.border-secondary,
.border-top {
  border-color: var(--border-color) !important;
}

/* ---------- Responsive ---------- */
@media (max-width: 991.98px) {
  .main-content { padding-top: 78px; }
  .site-navbar .navbar-collapse {
    background: var(--bg-card);
    margin-top: 0.7rem;
    padding: 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
  }
  .site-navbar .navbar-collapse .nav-link {
    color: var(--text-muted) !important;
  }
  .site-navbar .navbar-collapse .nav-link:hover,
  .site-navbar .navbar-collapse .nav-link.active {
    color: var(--primary) !important;
  }
}

@media (max-width: 575.98px) {
  .hero { padding: 2.2rem 0 1.8rem; }
  .card-custom { padding: 1.25rem; }
  .content-box { padding: 1.4rem; }
}