/* VARSAYILAN BEYAZ (AÇIK) TEMA */
:root,
:root[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --accent: #8c5a3c;
  --accent-hover: #73482d;
  --border-color: #e2e8f0;
  --reader-bg: #ffffff;
  --reader-text: #1e293b;
  --danger: #dc2626;
  --success: #059669;
}

:root[data-theme="dark"] {
  --bg-primary: #1c1d22;
  --bg-secondary: #25272e;
  --bg-tertiary: #2f323b;
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --accent: #c89d7c;
  --accent-hover: #b58967;
  --border-color: #373a44;
  --reader-bg: #212329;
  --reader-text: #e5e7eb;
  --danger: #ef4444;
  --success: #10b981;
}

:root[data-theme="cream"] {
  --bg-primary: #f4ecd8;
  --bg-secondary: #fbf6e9;
  --bg-tertiary: #ebe0c5;
  --text-primary: #3b2f2f;
  --text-secondary: #6e5a4f;
  --accent: #8b5e3c;
  --accent-hover: #6f482b;
  --border-color: #dccbb1;
  --reader-bg: #fdfaf2;
  --reader-text: #2c221e;
  --danger: #b91c1c;
  --success: #15803d;
}

/* EPUB İÇERİĞİNİN KENDİ KENAR BOŞLUKLARINI VE STİLLERİNİ BOZMAMAK İÇİN SIFIRLAMA */
*, *::before, *::after {
  box-sizing: border-box;
}

body, h1, h2, h3, h4, p, ul, ol {
  margin: 0;
  padding: 0;
}

/* TAM KAYNAK KOD VE KOPYALAMA / SÜRÜKLEME / YAZDIRMA KORUMASI */
body {
  font-family: 'Plus Jakarta Sans', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

img, a {
  -webkit-user-drag: none;
  user-drag: none;
}

input,
textarea,
.study-reader-content,
.summary-body,
.popup-viewer-body {
  -webkit-user-select: text;
  -moz-user-select: text;
  user-select: text;
}

/* Sayfayı Yazdır / PDF Olarak Kaydet ile İçerik İndirmeyi Engelle */
@media print {
  html, body {
    display: none !important;
  }
}

/* GÜVENLİK KİLİT EKRANI (DEVTOOLS ALGILANDIĞINDA) */
.security-lock-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.96);
  backdrop-filter: blur(12px);
  z-index: 999999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
}

.security-lock-card {
  max-width: 440px;
  background: var(--bg-secondary);
  border: 2px solid var(--danger);
  border-radius: 16px;
  padding: 32px 24px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6);
}

.security-lock-icon {
  font-size: 3rem;
  color: var(--danger);
  margin-bottom: 14px;
}

.security-lock-card h2 {
  margin-bottom: 10px;
}

.security-lock-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* PWA TELEFON / TABLET KURULUM KUTUSU */
.pwa-instructions-box {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 14px;
}

.pwa-inst-item strong {
  display: block;
  font-size: 0.88rem;
  margin-bottom: 4px;
}

.brand-font {
  font-family: 'Cinzel', serif;
  letter-spacing: 0.04em;
}

.serif-reader {
  font-family: 'Lora', Georgia, serif;
}

.hidden {
  display: none !important;
}

/* MAVİ IŞIK KORUMA FİLTRESİ */
.blue-light-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 99990;
  background: rgba(255, 168, 40, 0.22);
  mix-blend-mode: multiply;
  transition: opacity 0.25s ease;
}

:root[data-theme="dark"] .blue-light-overlay {
  mix-blend-mode: screen;
  background: rgba(255, 140, 20, 0.14);
}

/* 1 SANİYELİK TAM BEYAZ SPLASH EKRANI */
.splash-screen {
  position: fixed;
  inset: 0;
  background-color: #ffffff !important;
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.2s ease;
}

.splash-logo {
  width: 220px;
  height: 220px;
  object-fit: contain;
}

/* ÜYELİK GİRİŞ & KAYIT EKRANI */
.auth-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: radial-gradient(circle at top, var(--bg-tertiary), var(--bg-primary));
}

.auth-card {
  width: 100%;
  max-width: 450px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 28px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.12);
}

.auth-header {
  text-align: center;
  margin-bottom: 20px;
}

.auth-logo {
  width: 92px;
  height: 92px;
  object-fit: contain;
  border-radius: 50%;
  margin-bottom: 10px;
}

.auth-header h1 {
  font-size: 1.5rem;
  color: var(--accent);
}

.auth-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  background: var(--bg-tertiary);
  padding: 5px;
  border-radius: 10px;
  margin-bottom: 18px;
}

.auth-tab {
  border: none;
  background: transparent;
  color: var(--text-secondary);
  padding: 10px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
}

.auth-tab.active {
  background: var(--accent);
  color: #fff;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label, .small-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-input {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.92rem;
  outline: none;
}

.form-input:focus {
  border-color: var(--accent);
}

.category-select-with-btn {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nowrap-btn {
  white-space: nowrap;
  flex-shrink: 0;
  height: 40px;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1.5fr 1fr;
  gap: 12px;
}

.form-row-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  cursor: pointer;
  color: var(--text-secondary);
}

.forgot-pass-link {
  background: transparent;
  border: none;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
}

.forgot-pass-link:hover {
  color: var(--accent-hover);
}

/* BUTONLAR */
.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 10px 16px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background 0.15s;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 10px 14px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-secondary:hover {
  border-color: var(--accent);
}

.btn-danger-sm {
  background: rgba(220, 38, 38, 0.1);
  color: var(--danger);
  border: 1px solid rgba(220, 38, 38, 0.3);
  padding: 6px 11px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.btn-danger-sm:hover {
  background: var(--danger);
  color: #fff;
}

.btn-sm {
  padding: 7px 12px;
  font-size: 0.82rem;
}

.w-full {
  width: 100%;
}

/* ANA UYGULAMA DÜZENİ VE ÜST BAR */
.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.app-header {
  height: 64px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  flex-shrink: 0;
}

.header-left, .header-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-box {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}

.header-logo {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: contain;
}

.brand-title {
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--accent);
}

.nav-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  padding: 8px 13px;
  border-radius: 8px;
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  transition: all 0.15s;
}

.nav-btn.active,
.nav-btn:hover {
  background: var(--bg-tertiary);
  color: var(--accent);
  border-color: var(--border-color);
}

/* SAĞ ÜST KULLANICI AÇILIR LİSTE MENÜSÜ, TEMA VE EKRAN RENGİ SEÇENEKLERİ */
.user-dropdown-wrapper {
  position: relative;
}

.user-dropdown-trigger {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s;
}

.user-dropdown-trigger:hover {
  border-color: var(--accent);
}

.user-avatar-icon {
  font-size: 1.15rem;
  color: var(--accent);
}

.dropdown-arrow {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.user-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 285px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 8px;
  box-shadow: 0 14px 35px rgba(0, 0, 0, 0.22);
  z-index: 9999;
}

.dropdown-section-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-secondary);
  padding: 4px 10px 6px;
}

.dropdown-theme-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  padding: 0 6px 4px;
}

.dropdown-screen-color-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  padding: 0 6px 4px;
}

.scr-swatch {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1px solid rgba(0,0,0,0.25);
  display: inline-block;
}
.scr-swatch.white { background: #ffffff; }
.scr-swatch.cream { background: #f8f0dc; }
.scr-swatch.night { background: #141519; }
.scr-swatch.slate { background: #2b2e38; }
.scr-swatch.green { background: #dff0e2; }

.dropdown-theme-btn {
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-secondary);
  padding: 7px 6px;
  border-radius: 8px;
  font-size: 0.74rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  transition: all 0.15s;
}

.dropdown-theme-btn:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}

.dropdown-theme-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.blue-light-btn.active {
  background: #d97706 !important;
  border-color: #d97706 !important;
  color: #fff !important;
}

.dropdown-item {
  width: 100%;
  background: transparent;
  border: none;
  color: var(--text-primary);
  padding: 9px 12px;
  border-radius: 8px;
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  text-align: left;
}

.dropdown-item:hover,
.dropdown-item.active {
  background: var(--bg-tertiary);
  color: var(--accent);
}

.admin-dropdown-item {
  color: #d97706;
}

.logout-dropdown-item {
  color: var(--danger);
}

.dropdown-divider {
  height: 1px;
  background: var(--border-color);
  margin: 6px 0;
}

/* GÖVDE VE SOL MENÜ */
.app-body {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.left-sidebar {
  width: 345px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  flex-shrink: 0;
}

.sidebar-section {
  padding: 14px;
}

.toc-section {
  flex: 1;
  overflow-y: auto;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 10px;
  gap: 6px;
}

.sidebar-header-btns {
  display: flex;
  align-items: center;
  gap: 5px;
}

.mini-link-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--accent);
  font-size: 0.71rem;
  padding: 4px 7px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.mini-link-btn:hover {
  border-color: var(--accent);
}

.sidebar-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar-course-accordion {
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background: var(--bg-primary);
  overflow: hidden;
  transition: border-color 0.15s;
}

.sidebar-course-accordion.active {
  border-color: var(--accent);
}

.sidebar-course-item {
  padding: 10px 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  transition: background 0.15s;
}

.sidebar-course-accordion.active > .sidebar-course-item {
  background: var(--bg-tertiary);
}

.sidebar-course-info {
  flex: 1;
  min-width: 0;
}

.sidebar-course-name {
  font-weight: 700;
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-course-meta {
  font-size: 0.73rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 2px;
}

.sidebar-course-children {
  padding: 8px;
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.course-order-controls {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.order-arrow-btn {
  width: 28px;
  height: 28px;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border-radius: 6px;
  font-size: 0.74rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.order-arrow-btn:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

.order-arrow-btn:disabled {
  opacity: 0.35;
  cursor: default;
}

/* SOL EN ALT KÖŞE: SERHAT NEHİR GELİŞTİRİCİ ALANI */
.sidebar-dev-footer {
  margin-top: auto;
  padding: 12px 16px;
  background: var(--bg-tertiary);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.dev-logo {
  width: 38px;
  height: 38px;
  object-fit: contain;
  border-radius: 8px;
}

.dev-text-box {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.dev-name {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-primary);
}

.dev-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
}

/* SOL MENÜ KAYNAK / KİTAP BİLGİLENDİRME (KÜNYE) VE İÇİNDEKİLER AĞACI */
.sidebar-source-group {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-primary);
  overflow: hidden;
}

.sidebar-source-header {
  padding: 9px 10px;
  background: var(--bg-tertiary);
  font-weight: 700;
  font-size: 0.83rem;
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
}

.source-header-title {
  cursor: pointer;
  flex: 1;
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
}

.source-header-title span {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.source-header-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.source-info-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 26px;
  height: 26px;
  font-size: 0.74rem;
  border-radius: 6px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.source-info-btn:hover,
.source-info-btn.active {
  border-color: var(--accent);
  color: var(--accent);
}

.sidebar-book-info-panel {
  background: var(--bg-secondary);
  border-top: 1px dashed var(--border-color);
  padding: 10px 12px;
  font-size: 0.78rem;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.book-meta-row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  border-bottom: 1px solid var(--bg-tertiary);
  padding-bottom: 3px;
}

.book-meta-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.book-meta-label {
  color: var(--text-secondary);
  font-weight: 600;
  flex-shrink: 0;
}

.book-meta-val {
  color: var(--text-primary);
  font-weight: 600;
  text-align: right;
}

.sidebar-source-toc-items {
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-top: 1px solid var(--border-color);
}

.toc-item {
  padding: 6px 8px;
  border-radius: 6px;
  font-size: 0.82rem;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 8px;
  border-left: 2px solid transparent;
}

.toc-item:hover, .toc-item.active {
  background: var(--bg-tertiary);
  border-left-color: var(--accent);
  color: var(--accent);
}

.toc-level-1 { padding-left: 8px; font-weight: 700; }
.toc-level-2 { padding-left: 20px; font-weight: 500; font-size: 0.8rem; }
.toc-level-3 { padding-left: 32px; font-weight: 400; font-size: 0.78rem; color: var(--text-secondary); }
.toc-level-4 { padding-left: 44px; font-weight: 400; font-size: 0.76rem; color: var(--text-secondary); }

/* ANA İÇERİK */
.main-content {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}

.empty-state-box {
  max-width: 480px;
  margin: 60px auto;
  text-align: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 36px 24px;
  border-radius: 16px;
}

.empty-logo {
  width: 84px;
  height: 84px;
  object-fit: contain;
  margin-bottom: 14px;
}

.empty-state-box h2 {
  margin-bottom: 8px;
}

.empty-state-box p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-bottom: 18px;
}

.badge {
  background: var(--bg-tertiary);
  color: var(--accent);
  border: 1px solid var(--border-color);
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
}

.hint-text {
  font-size: 0.83rem;
  color: var(--text-secondary);
}

/* SINAV VE ÖZET SAYFASINDAKİ İÇİNDEKİLER KONU BAŞLIĞI SEÇİCİ */
.exam-topic-selector-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.exam-topic-actions-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

/* YAPAY ZEKA SESLENDİRME (TTS) OYNATICI BARI */
.tts-player-bar {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 10px 14px;
  margin-bottom: 14px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.tts-left-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.tts-wave-icon {
  font-size: 1.25rem;
  color: var(--accent);
}

.tts-title {
  font-size: 0.86rem;
  font-weight: 700;
}

.tts-subtext {
  font-size: 0.75rem;
  color: var(--text-secondary);
  max-width: 280px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tts-controls-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.tts-ctrl-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 7px 12px;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s;
}

.tts-ctrl-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.tts-ctrl-btn.play-btn {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.tts-ctrl-btn.play-btn:hover {
  background: var(--accent-hover);
  color: #fff;
}

.tts-ctrl-btn.stop-btn:hover {
  border-color: var(--danger);
  color: var(--danger);
}

.rate-slider {
  width: 100%;
  accent-color: var(--accent);
  cursor: pointer;
}

.rate-presets-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
}

/* ÖZET PANELİ */
.summary-panel {
  background: var(--bg-secondary);
  border: 2px solid var(--accent);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 16px;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

.summary-body {
  line-height: 1.75;
  font-size: 0.96rem;
  max-height: 62vh;
  overflow-y: auto;
  padding: 12px;
  border-radius: 8px;
}

.summary-section-block {
  background: rgba(140, 90, 60, 0.06);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 12px;
}

.summary-section-title {
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 6px;
  font-size: 0.96rem;
}

.summary-bullet-list {
  padding-left: 18px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

/* OKUMA ALANI, EPUB ORİJİNAL CSS KORUMASI VE TEMADAN BAĞIMSIZ EKRAN RENKLERİ */
.reader-and-notes-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 16px;
  align-items: start;
}

.reader-card, .user-notes-card, .card-panel, .exam-runner-card, .exam-history-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px;
}

.reader-Subheader {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 12px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.reader-nav-controls, .reader-tools-info {
  display: flex;
  align-items: center;
  gap: 8px;
}

.reader-page-title {
  font-weight: 700;
  color: var(--accent);
}

.study-reader-content {
  background: var(--reader-bg);
  color: var(--reader-text);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 28px;
  min-height: 560px;
  max-height: 76vh;
  overflow-y: auto;
  line-height: 1.8;
  font-size: 1.05rem;
  outline: none;
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* EPUB Kitabın Kendi Yazı Tipi, Boyutu, Satır Aralığı ve Paragraf Stillerini Koruyan Kapsayıcı */
.epub-book-scope {
  all: revert;
  display: block;
  width: 100%;
  color: inherit;
}

/* Temadan Bağımsız Ekran Rengi Modları */
.study-reader-content[data-reader-screen="white"],
.summary-body[data-reader-screen="white"] {
  background-color: #ffffff !important;
  color: #1e293b !important;
}

.study-reader-content[data-reader-screen="cream"],
.summary-body[data-reader-screen="cream"] {
  background-color: #fdf6e3 !important;
  color: #3b2f2f !important;
}

.study-reader-content[data-reader-screen="night"],
.summary-body[data-reader-screen="night"] {
  background-color: #141519 !important;
  color: #e5e7eb !important;
}

.study-reader-content[data-reader-screen="slate"],
.summary-body[data-reader-screen="slate"] {
  background-color: #2b2e38 !important;
  color: #f3f4f6 !important;
}

.study-reader-content[data-reader-screen="green"],
.summary-body[data-reader-screen="green"] {
  background-color: #e8f5e9 !important;
  color: #1b3b22 !important;
}

.study-reader-content img {
  max-width: 100%;
  height: auto;
}

/* ORİJİNAL PDF SAYFASI + ŞEFFAF FOSFORLU KALEM (MULTIPLY) METİN KATMANI */
.pdf-original-page {
  position: relative;
  width: 100%;
  max-width: 860px;
  margin: 0 auto 24px auto;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.14);
  overflow: hidden;
  -webkit-user-select: text;
  user-select: text;
}

.pdf-original-page img.pdf-page-bg {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 !important;
  border-radius: 0 !important;
  pointer-events: none;
  -webkit-user-select: none;
  user-select: none;
}

.pdf-text-layer {
  position: absolute;
  inset: 0;
  line-height: 1.15;
  color: transparent !important;
  caret-color: transparent;
  mix-blend-mode: multiply;
  -webkit-user-select: text;
  user-select: text;
}

.pdf-text-layer * {
  color: transparent !important;
}

.pdf-text-layer span.pdf-text-item {
  position: absolute;
  white-space: pre;
  cursor: text;
  transform-origin: 0% 0%;
  color: transparent !important;
  border-radius: 3px;
}

.pdf-text-layer ::selection {
  background: rgba(59, 130, 246, 0.28);
  color: transparent;
}

.pdf-text-layer [style*="background-color"],
.pdf-text-layer font[style*="background-color"],
.pdf-text-layer span[style*="background-color"] {
  border-radius: 3px;
  padding: 1px 0;
}

.pdf-text-layer u {
  text-decoration: underline 2px rgba(220, 38, 38, 0.75) !important;
}

.pdf-text-layer b,
.pdf-text-layer strong {
  background-color: rgba(200, 157, 124, 0.32);
  border-radius: 3px;
}

.pdf-text-layer i,
.pdf-text-layer em {
  border-bottom: 2px dotted rgba(37, 99, 235, 0.75);
}

.pdf-text-layer .user-inline-note {
  background-color: rgba(245, 158, 11, 0.36) !important;
  border-bottom: 2px dashed rgba(217, 119, 6, 0.85) !important;
  color: transparent !important;
  cursor: pointer !important;
  pointer-events: auto !important;
}

.pdf-text-layer .user-inline-note::after {
  content: "";
}

/* OKUMA EKRANINDAKİ VURGULU KULLANICI NOTU VE DİPNOT BAĞLANTILARI */
.user-inline-note {
  background-color: rgba(245, 158, 11, 0.32);
  border-bottom: 2px dashed #d97706;
  padding: 1px 4px;
  border-radius: 4px;
  cursor: pointer;
  position: relative;
  transition: background-color 0.15s;
}

.user-inline-note:hover {
  background-color: rgba(245, 158, 11, 0.48);
}

.user-inline-note::after {
  content: " 📝";
  font-size: 0.78em;
  vertical-align: super;
}

.study-reader-content a,
.study-reader-content sup,
.epub-footnote-ref {
  color: var(--accent);
  font-weight: 700;
  cursor: pointer;
  text-decoration: underline;
}

/* KULLANICI MANUEL NOTLARI */
.manual-note-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 14px;
}

.user-notes-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 460px;
  overflow-y: auto;
}

.note-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  padding: 10px 12px;
  cursor: pointer;
}

.note-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  font-size: 0.88rem;
  margin-bottom: 4px;
}

.note-item-body {
  font-size: 0.86rem;
  color: var(--text-secondary);
  white-space: pre-wrap;
}

/* ÖZEL SAĞ TIK (CONTEXT) MENÜSÜ */
.custom-context-menu {
  position: fixed;
  z-index: 9999;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 8px;
  width: 220px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
}

.ctx-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.ctx-group button {
  background: transparent;
  border: none;
  color: var(--text-primary);
  padding: 7px 10px;
  text-align: left;
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
}

.ctx-group button:hover {
  background: var(--bg-tertiary);
  color: var(--accent);
}

.ctx-divider {
  height: 1px;
  background: var(--border-color);
  margin: 6px 0;
}

.ctx-label {
  font-size: 0.72rem;
  color: var(--text-secondary);
  padding: 2px 8px 6px;
  text-transform: uppercase;
}

.ctx-colors {
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 4px 6px;
}

.color-dot {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid rgba(0,0,0,0.15);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.color-dot.yellow { background: #fde047; }
.color-dot.green  { background: #86efac; }
.color-dot.blue   { background: #93c5fd; }
.color-dot.red    { background: #fca5a5; }
.color-dot.clear  { background: var(--bg-tertiary); color: var(--text-primary); font-size: 0.75rem; }

/* MODAL PENCERELERİ */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 99995;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-card {
  width: 100%;
  max-width: 520px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
  max-height: 88vh;
  display: flex;
  flex-direction: column;
}

.modal-card-wide {
  max-width: 760px;
}

.selected-quote-preview {
  background: var(--bg-tertiary);
  border-left: 3px solid var(--accent);
  padding: 10px 12px;
  border-radius: 6px;
  font-size: 0.86rem;
  font-style: italic;
  color: var(--text-secondary);
  max-height: 110px;
  overflow-y: auto;
}

.popup-viewer-body {
  margin-top: 12px;
  line-height: 1.75;
  font-size: 0.96rem;
  overflow-y: auto;
  max-height: 50vh;
}

.modal-footer-btns {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.toc-editor-rows {
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow-y: auto;
  max-height: 52vh;
  padding-right: 4px;
}

.toc-editor-row {
  display: grid;
  grid-template-columns: 1fr 145px auto;
  gap: 8px;
  align-items: center;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: 8px;
  border-radius: 8px;
}

/* 3 TÜRLÜ SINAV MODU SEÇİCİ, ÖĞRETİCİ SORULAR VE HOCA SORU SETLERİ */
.exam-mode-switcher-bar {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 6px;
  border-radius: 12px;
}

.exam-type-tab {
  border: none;
  background: transparent;
  color: var(--text-secondary);
  padding: 9px 16px;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.exam-type-tab.active {
  background: var(--accent);
  color: #fff;
}

.ai-prepared-note {
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 600;
  margin-top: 3px;
  display: flex;
  align-items: center;
  gap: 5px;
}

.teacher-sets-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.teacher-set-chip {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 8px 14px;
  border-radius: 10px;
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.15s;
}

.teacher-set-chip:hover {
  border-color: var(--accent);
}

.teacher-set-chip.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.inst-answer-box {
  margin-top: 10px;
  padding: 12px 14px;
  background: var(--bg-secondary);
  border-left: 3px solid var(--success);
  border-radius: 8px;
  font-size: 0.92rem;
  line-height: 1.65;
}

/* ADMİN SORU YÖNETİM KARTLARI */
.admin-q-manage-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.admin-q-manage-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
}

.admin-q-manage-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

/* SINAV, PROFİL VE ADMİN GRIDLERİ */
.exams-grid, .profile-grid, .admin-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 18px;
  align-items: start;
}

.quiz-config-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  background: var(--bg-primary);
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.quiz-questions-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 12px;
}

.quiz-q-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 14px;
}

.quiz-q-title {
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.5;
}

.quiz-opt-btn {
  width: 100%;
  text-align: left;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 9px 12px;
  border-radius: 8px;
  margin-bottom: 6px;
  cursor: pointer;
  font-size: 0.9rem;
}

.quiz-opt-btn.selected {
  border-color: var(--accent);
  background: var(--bg-tertiary);
}

.quiz-opt-btn.correct {
  border-color: var(--success);
  background: rgba(16, 185, 129, 0.18);
}

.quiz-opt-btn.wrong {
  border-color: var(--danger);
  background: rgba(239, 68, 68, 0.18);
}

.exam-history-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.history-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.score-pill {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--accent);
}

/* PROFİLDE GEÇMİŞ SINAV NOTLARINI SIFIRLAMA KUTUSU */
.profile-exam-reset-box {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.profile-exam-reset-box h4 {
  font-size: 0.92rem;
  margin-bottom: 3px;
}

/* PROFİLDE DERS VE KAYNAK SEÇİM KARTLARI */
.profile-course-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 12px 14px;
}

.profile-course-main-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-weight: 700;
}

.profile-course-check-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  flex: 1;
}

.profile-sources-sublist {
  margin-top: 10px;
  padding-top: 8px;
  padding-left: 14px;
  border-top: 1px dashed var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.profile-source-check-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ADMİN PANELİ */
.admin-banner {
  background: var(--bg-secondary);
  border: 1px solid var(--accent);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 18px;
}

.admin-banner-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.admin-fs-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.upload-zone {
  border: 2px dashed var(--accent);
  background: var(--bg-secondary);
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  cursor: pointer;
  margin: 8px 0;
}

.upload-icon {
  font-size: 1.8rem;
  color: var(--accent);
  margin-bottom: 6px;
}

.upload-progress {
  margin-top: 10px;
  font-weight: 600;
  color: var(--accent);
  font-size: 0.88rem;
}

.admin-sources-box {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 12px;
  margin-bottom: 12px;
}

.admin-accordion {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 11px 14px;
  margin-top: 10px;
}

.admin-accordion summary {
  font-weight: 600;
  cursor: pointer;
  color: var(--accent);
  user-select: none;
}

.profile-courses-list, .admin-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.course-check-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: 10px 14px;
  border-radius: 8px;
  gap: 10px;
  transition: border-color 0.15s, background 0.15s;
}

.admin-selectable-course {
  cursor: pointer;
}

.admin-selectable-course:hover {
  border-color: var(--accent);
}

.admin-selectable-course.selected-admin-course {
  border: 2px solid var(--accent);
  background: var(--bg-tertiary);
}

.icon-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 34px;
  height: 34px;
  border-radius: 8px;
  cursor: pointer;
}

.logout-btn {
  border: none;
  background: transparent;
  color: var(--danger);
  cursor: pointer;
  font-size: 0.95rem;
}

.divider {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 14px 0;
}

.mt-4 { margin-top: 4px; }
.mt-8 { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; }
.mb-12 { margin-bottom: 12px; }

/* TOAST BİLDİRİMİ */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 99999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  background: var(--bg-secondary);
  border-left: 4px solid var(--accent);
  color: var(--text-primary);
  padding: 12px 16px;
  border-radius: 8px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.25);
  font-size: 0.88rem;
}

.mobile-only {
  display: none;
}

@media (max-width: 960px) {
  .reader-and-notes-grid, .exams-grid, .profile-grid, .admin-grid, .grid-3, .toc-editor-row, .exam-topic-selector-grid {
    grid-template-columns: 1fr;
  }
  .left-sidebar {
    position: fixed;
    top: 64px;
    bottom: 0;
    left: -355px;
    z-index: 1000;
    transition: left 0.25s ease;
  }
  .left-sidebar.open {
    left: 0;
  }
  .mobile-only {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  .nav-btn span {
    display: none;
  }
}