:root {
  --primary-dark: #212529;
  --accent-red: #c0392b;
  --light-bg: #f8f9fa;
  --body-bg: #ffffff;
  --body-color: #212529;
  --card-bg: #ffffff;
  --border-color: #dee2e6;
  --muted-color: #6c757d;
  --section-alt-bg: #f8f9fa;
  --navbar-bg: #212529;
}

[data-theme="dark"] {
  --primary-dark: #f1f1f1;
  --light-bg: #1e2124;
  --body-bg: #16181b;
  --body-color: #e4e4e4;
  --card-bg: #23272b;
  --border-color: #3a3f45;
  --muted-color: #a0a7af;
  --section-alt-bg: #1e2124;
  --navbar-bg: #0f1012;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  padding-top: 76px;
  font-size: 16px;
  line-height: 1.7;
  background-color: var(--body-bg);
  color: var(--body-color);
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Navigasyon */
.navbar {
  background-color: var(--navbar-bg) !important;
  transition: background-color 0.3s ease;
}

.navbar-brand {
  font-weight: 700;
  letter-spacing: 1px;
}
.navbar-brand span {
  color: var(--accent-red);
}

/* Dark Mode Toggle */
#darkModeToggle {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.25);
  color: #fff;
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
  margin-left: 8px;
}
#darkModeToggle:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.5);
}

/* Hero Bölümü */
.hero-section {
  background:
    linear-gradient(rgba(33, 37, 41, 0.88), rgba(33, 37, 41, 0.92)),
    url("https://images.unsplash.com/photo-1504307651254-35680f356dfd?q=80&w=2070&auto=format&fit=crop")
      no-repeat center center;
  background-size: cover;
  color: white;
  padding: 120px 0;
  border-bottom: 4px solid var(--accent-red);
}

.hero-section h1 {
  font-family: 'Playfair Display', Georgia, serif;
}

@media (max-width: 768px) {
  .hero-section {
    padding: 70px 0 60px;
  }
  .hero-section h1 {
    font-size: 2.2rem;
  }
}

/* Başlık Vurguları */
.section-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 2rem;
  position: relative;
  padding-bottom: 0.5rem;
}
.section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 60px;
  height: 4px;
  background-color: var(--accent-red);
}

/* Bölüm arka planları */
section.container,
section#nedir {
  background-color: var(--body-bg);
}

.bg-light-alt {
  background-color: var(--section-alt-bg) !important;
}

/* Kartlar */
.card {
  background-color: var(--card-bg);
  border-color: var(--border-color);
  color: var(--body-color);
  transition: background-color 0.3s ease;
}

.concept-card {
  border: none;
  background-color: var(--card-bg);
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
  transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
  height: 100%;
}
.concept-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}
[data-theme="dark"] .concept-card {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}
[data-theme="dark"] .concept-card:hover {
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.6);
}

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

.bg-light {
  background-color: var(--section-alt-bg) !important;
}

.list-group-item {
  background-color: transparent;
  color: var(--body-color);
  border-color: var(--border-color);
}

/* Günün Sözü */
.quote-section {
  background: linear-gradient(135deg, #1a0000 0%, #2d0000 50%, #1a0000 100%);
  color: white;
  position: relative;
  overflow: hidden;
}
.quote-section::before {
  content: '\201C';
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 20rem;
  color: rgba(192, 57, 43, 0.15);
  position: absolute;
  top: -4rem;
  left: 1rem;
  line-height: 1;
  pointer-events: none;
}
.quote-text {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.45rem;
  font-style: italic;
  line-height: 1.8;
  max-width: 780px;
  margin: 0 auto;
}
.quote-author {
  font-size: 0.95rem;
  color: #e07070;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-top: 1.2rem;
}
#refreshQuote {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.3);
  color: rgba(255,255,255,0.7);
  border-radius: 20px;
  padding: 4px 14px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 1rem;
}
#refreshQuote:hover {
  border-color: var(--accent-red);
  color: white;
}

/* Kavram Arama */
#kavramSearch {
  max-width: 420px;
  border: 2px solid var(--border-color);
  border-radius: 25px;
  padding: 10px 20px;
  font-size: 0.95rem;
  background-color: var(--card-bg);
  color: var(--body-color);
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}
#kavramSearch:focus {
  border-color: var(--accent-red);
  box-shadow: 0 0 0 3px rgba(192, 57, 43, 0.15);
}
[data-theme="dark"] #kavramSearch::placeholder {
  color: var(--muted-color);
}

/* Paylaşım butonları */
.share-buttons {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  flex-wrap: wrap;
}
.btn-share {
  font-size: 0.78rem;
  padding: 4px 12px;
  border-radius: 20px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: opacity 0.2s, transform 0.15s;
}
.btn-share:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}
.btn-twitter {
  background: #000000;
  color: white;
}
.btn-whatsapp {
  background: #25D366;
  color: white;
}

/* Zaman Çizelgesi */
.timeline {
  position: relative;
  padding: 2rem 0;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--accent-red), #8B0000);
  transform: translateX(-50%);
}
@media (max-width: 768px) {
  .timeline::before { left: 24px; }
}

.timeline-item {
  display: flex;
  justify-content: flex-end;
  padding-right: calc(50% + 36px);
  margin-bottom: 3rem;
  position: relative;
}
.timeline-item:nth-child(even) {
  justify-content: flex-start;
  padding-right: 0;
  padding-left: calc(50% + 36px);
}
@media (max-width: 768px) {
  .timeline-item,
  .timeline-item:nth-child(even) {
    justify-content: flex-start;
    padding-right: 0;
    padding-left: 64px;
  }
}

.timeline-dot {
  position: absolute;
  left: 50%;
  top: 20px;
  transform: translateX(-50%);
  width: 18px;
  height: 18px;
  background: var(--accent-red);
  border: 3px solid var(--body-bg);
  border-radius: 50%;
  z-index: 1;
  box-shadow: 0 0 0 3px rgba(192, 57, 43, 0.3);
}
@media (max-width: 768px) {
  .timeline-dot { left: 24px; }
}

.timeline-card {
  background: var(--card-bg);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  max-width: 420px;
  width: 100%;
  border-left: 4px solid var(--accent-red);
  transition: transform 0.3s, box-shadow 0.3s;
}
.timeline-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.14);
}
[data-theme="dark"] .timeline-card {
  box-shadow: 0 4px 16px rgba(0,0,0,0.5);
}
.timeline-year {
  font-weight: 700;
  color: var(--accent-red);
  font-size: 0.85rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 0.3rem;
}

/* site-wide sayfa görünümü */
.page-hero {
  background: linear-gradient(135deg, #1a0a0a 0%, #2d1515 100%);
  color: white;
  padding: 80px 0 60px;
  border-bottom: 4px solid var(--accent-red);
}

/* Kaynak kartları */
.kaynak-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.25rem;
  transition: transform 0.2s, box-shadow 0.2s;
  height: 100%;
}
.kaynak-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.12);
}
.kaynak-badge {
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 12px;
  font-weight: 600;
}

/* İletişim formu */
.contact-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2.5rem;
}

/* İletişim Bilgi Kartları */
.contact-info-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.1rem 1.25rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  transition: transform 0.2s, box-shadow 0.2s;
}
.contact-info-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.1);
}
.contact-info-icon {
  font-size: 1.6rem;
  flex-shrink: 0;
  line-height: 1;
}

/* Form Elemanları */
.form-control,
.form-select {
  background-color: var(--card-bg);
  color: var(--body-color);
  border-color: var(--border-color);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-control::placeholder {
  color: var(--muted-color);
}
.form-control:focus,
.form-select:focus {
  background-color: var(--card-bg);
  color: var(--body-color);
  border-color: var(--accent-red);
  box-shadow: 0 0 0 3px rgba(192, 57, 43, 0.15);
}
/* Dark modda select ok rengi */
[data-theme="dark"] .form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='none' stroke='%23a0a7af' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3E%3C/svg%3E");
}

/* Yukarı Çık Butonu */
#backToTop {
  position: fixed;
  bottom: 30px;
  right: 30px;
  display: none;
  background-color: var(--accent-red);
  color: white;
  border: none;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  font-size: 24px;
  cursor: pointer;
  z-index: 1000;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
  transition: background-color 0.3s;
}
#backToTop:hover {
  background-color: #a93226;
}

section {
  padding: 80px 0;
}

/* Yumuşak Kaydırma */
html {
  scroll-behavior: smooth;
}

/* Okuma İlerleme Çubuğu */
#reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--accent-red);
  width: 0%;
  z-index: 9999;
  transition: width 0.1s linear;
}

/* Footer */
footer {
  background-color: var(--navbar-bg) !important;
  border-top: 1px solid var(--border-color);
}

/* No-results */
#noResults {
  display: none;
  text-align: center;
  padding: 2rem;
  color: var(--muted-color);
}