/* Ela LGS • Odak Odaklı Sade Tasarım (Açık / Koyu Mod - Modern Web Guidance Uyumlu) */

:root {
  /* Ham Renk Tokenları (Açık & Koyu) */
  --bg-canvas-light: #f6f8fc;
  --bg-canvas-dark: #0b1120;

  --bg-surface-light: #ffffff;
  --bg-surface-dark: #131c31;

  --bg-elevated-light: #eef2f9;
  --bg-elevated-dark: #1e293b;

  --text-primary-light: #0f172a;
  --text-primary-dark: #f1f5f9;

  --text-secondary-light: #475569;
  --text-secondary-dark: #94a3b8;

  --border-subtle-light: #e2e8f0;
  --border-subtle-dark: #26334d;

  --brand-primary-light: #4f46e5;
  --brand-primary-dark: #818cf8;

  --brand-soft-light: #eef2ff;
  --brand-soft-dark: #1e1b4b;

  --success-light: #059669;
  --success-dark: #34d399;

  --warning-light: #d97706;
  --warning-dark: #fbbf24;

  --danger-light: #dc2626;
  --danger-dark: #f87171;

  /* Varsayılan (Fallback) Değerler */
  --bg-canvas: var(--bg-canvas-light);
  --bg-surface: var(--bg-surface-light);
  --bg-elevated: var(--bg-elevated-light);
  --text-primary: var(--text-primary-light);
  --text-secondary: var(--text-secondary-light);
  --border-subtle: var(--border-subtle-light);
  --brand-primary: var(--brand-primary-light);
  --brand-soft: var(--brand-soft-light);
  --color-success: var(--success-light);
  --color-warning: var(--warning-light);
  --color-danger: var(--danger-light);

  /* MANDATORY: Sistem tercihi fallback */
  @media (prefers-color-scheme: dark) {
    --bg-canvas: var(--bg-canvas-dark);
    --bg-surface: var(--bg-surface-dark);
    --bg-elevated: var(--bg-elevated-dark);
    --text-primary: var(--text-primary-dark);
    --text-secondary: var(--text-secondary-dark);
    --border-subtle: var(--border-subtle-dark);
    --brand-primary: var(--brand-primary-dark);
    --brand-soft: var(--brand-soft-dark);
    --color-success: var(--success-dark);
    --color-warning: var(--warning-dark);
    --color-danger: var(--danger-dark);
  }

  /* Modern light-dark() fonksiyonu desteği */
  @supports (color: light-dark(white, black)) {
    --bg-canvas: light-dark(var(--bg-canvas-light), var(--bg-canvas-dark));
    --bg-surface: light-dark(var(--bg-surface-light), var(--bg-surface-dark));
    --bg-elevated: light-dark(var(--bg-elevated-light), var(--bg-elevated-dark));
    --text-primary: light-dark(var(--text-primary-light), var(--text-primary-dark));
    --text-secondary: light-dark(var(--text-secondary-light), var(--text-secondary-dark));
    --border-subtle: light-dark(var(--border-subtle-light), var(--border-subtle-dark));
    --brand-primary: light-dark(var(--brand-primary-light), var(--brand-primary-dark));
    --brand-soft: light-dark(var(--brand-soft-light), var(--brand-soft-dark));
    --color-success: light-dark(var(--success-light), var(--success-dark));
    --color-warning: light-dark(var(--warning-light), var(--warning-dark));
    --color-danger: light-dark(var(--danger-light), var(--danger-dark));
  }

  /* MANDATORY: Tarayıcı yerleşik UI bileşenlerini (kaydırma çubuğu, inputlar) otomatik uyarla */
  color-scheme: light dark;
  accent-color: var(--brand-primary);

  /* Meta etiketi üzerinden kullanıcı tema geçersiz kılmasını (override) CSS'e yansıt */
  &:has(> head > meta[name="color-scheme"][content="dark"]) {
    color-scheme: dark;
    --bg-canvas: var(--bg-canvas-dark);
    --bg-surface: var(--bg-surface-dark);
    --bg-elevated: var(--bg-elevated-dark);
    --text-primary: var(--text-primary-dark);
    --text-secondary: var(--text-secondary-dark);
    --border-subtle: var(--border-subtle-dark);
    --brand-primary: var(--brand-primary-dark);
    --brand-soft: var(--brand-soft-dark);
    --color-success: var(--success-dark);
    --color-warning: var(--warning-dark);
    --color-danger: var(--danger-dark);
  }

  &:has(> head > meta[name="color-scheme"][content="light"]) {
    color-scheme: light;
    --bg-canvas: var(--bg-canvas-light);
    --bg-surface: var(--bg-surface-light);
    --bg-elevated: var(--bg-elevated-light);
    --text-primary: var(--text-primary-light);
    --text-secondary: var(--text-secondary-light);
    --border-subtle: var(--border-subtle-light);
    --brand-primary: var(--brand-primary-light);
    --brand-soft: var(--brand-soft-light);
    --color-success: var(--success-light);
    --color-warning: var(--warning-light);
    --color-danger: var(--danger-light);
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", sans-serif;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  min-height: 100dvh;
}

/* Ana Uygulama İskeleti */
.app-shell {
  display: grid;
  grid-template-columns: 265px 1fr;
  min-height: 100dvh;
}

/* Sol Navigasyon (Masaüstü) */
.sidebar {
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  position: sticky;
  top: 0;
  height: 100dvh;
  overflow-y: auto;
}

.brand-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.25rem 0.5rem;
}

.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, #4f46e5, #0ea5e9);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.brand-title {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

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

/* Aktif Profil Kartı */
.profile-switcher-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.profile-info {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.profile-avatar {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--bg-surface);
  display: grid;
  place-items: center;
  font-size: 1.2rem;
}

.profile-name {
  font-weight: 700;
  font-size: 0.92rem;
}

.profile-role-badge {
  font-size: 0.72rem;
  color: var(--brand-primary);
  font-weight: 600;
}

/* Menü Butonları */
.nav-menu {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
}

.nav-section-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  font-weight: 700;
  padding: 0.5rem 0.65rem 0.2rem;
}

.nav-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  text-align: left;
  padding: 0.7rem 0.85rem;
  border-radius: 11px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s, color 0.15s;
}

.nav-btn-left {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.nav-btn:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

.nav-btn.active {
  background: var(--brand-soft);
  color: var(--brand-primary);
  font-weight: 700;
}

.nav-badge {
  background: var(--color-danger);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
}

/* Ana İçerik Alanı */
.main-area {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding-bottom: 5rem;
}

.topbar {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.9rem 1.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  position: sticky;
  top: 0;
  z-index: 20;
}

.topbar-left h1 {
  font-size: 1.2rem;
  font-weight: 800;
}

.topbar-left p {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.content-container {
  max-width: 1180px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Kartlar ve Grid Yapıları */
.grid-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(215px, 1fr));
  gap: 1rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.card-title {
  font-size: 1.02rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 1.15rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.stat-value {
  font-size: 1.65rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.stat-sub {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

/* İlerleme Çubuğu */
.progress-track {
  width: 100%;
  height: 9px;
  background: var(--bg-elevated);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #4f46e5, #0ea5e9);
  border-radius: 999px;
  transition: width 0.35s ease;
}

/* Butonlar */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.6rem 1rem;
  border-radius: 10px;
  font-size: 0.88rem;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.1s, opacity 0.15s, background-color 0.15s;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: #4f46e5;
  color: #ffffff;
}

.btn-primary:hover {
  background: #4338ca;
}

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

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

.btn-success {
  background: #059669;
  color: #ffffff;
}

.btn-warning {
  background: #d97706;
  color: #ffffff;
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
  border-radius: 8px;
}

/* Form Elemanları */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

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

.input,
.select,
.textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border-radius: 10px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-canvas);
  color: var(--text-primary);
  font-size: 0.92rem;
  font-family: inherit;
}

.textarea {
  min-height: 82px;
  resize: vertical;
}

/* Fotoğraf Yükleme Kutusu */
.photo-dropzone {
  border: 2px dashed var(--border-subtle);
  border-radius: 14px;
  padding: 1.5rem;
  text-align: center;
  background: var(--bg-canvas);
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
}

.photo-dropzone:hover {
  border-color: var(--brand-primary);
  background: var(--brand-soft);
}

.photo-preview-img {
  max-width: 100%;
  max-height: 290px;
  border-radius: 12px;
  object-fit: contain;
  border: 1px solid var(--border-subtle);
}

/* AI Çözüm & Sokratik İpucu Kutuları */
.hint-box {
  background: var(--brand-soft);
  border-left: 4px solid var(--brand-primary);
  padding: 1rem;
  border-radius: 10px;
  font-size: 0.92rem;
}

.solution-box {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.step-item {
  padding: 0.6rem 0.8rem;
  background: var(--bg-surface);
  border-radius: 8px;
  border: 1px solid var(--border-subtle);
  font-size: 0.9rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--bg-elevated);
  color: var(--text-primary);
}

.tag-due {
  background: rgba(220, 38, 38, 0.14);
  color: var(--color-danger);
}

.tag-scheduled {
  background: rgba(217, 119, 6, 0.15);
  color: var(--color-warning);
}

.tag-mastered {
  background: rgba(5, 150, 105, 0.15);
  color: var(--color-success);
}

/* Pomodoro / Odak Sayacı */
.timer-display {
  font-size: 3.1rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
  text-align: center;
  padding: 0.75rem 0;
  color: var(--brand-primary);
}

/* Test / Quiz Şık Butonları */
.quiz-option {
  width: 100%;
  text-align: left;
  padding: 0.85rem 1rem;
  border-radius: 11px;
  border: 1.5px solid var(--border-subtle);
  background: var(--bg-canvas);
  color: var(--text-primary);
  font-size: 0.93rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: border-color 0.15s, background-color 0.15s;
}

.quiz-option:hover {
  border-color: var(--brand-primary);
}

.quiz-option.selected {
  border-color: var(--brand-primary);
  background: var(--brand-soft);
  font-weight: 700;
}

.quiz-option.correct {
  border-color: var(--color-success);
  background: rgba(5, 150, 105, 0.14);
}

.quiz-option.wrong {
  border-color: var(--color-danger);
  background: rgba(220, 38, 38, 0.14);
}

.option-letter {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.82rem;
  flex-shrink: 0;
}

/* Native <dialog> Modal Stili */
dialog.app-dialog {
  margin: auto;
  border: 1px solid var(--border-subtle);
  border-radius: 18px;
  background: var(--bg-surface);
  color: var(--text-primary);
  padding: 1.5rem;
  max-width: 460px;
  width: calc(100% - 2rem);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

dialog.app-dialog::backdrop {
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
}

/* Mobil Alt Bar */
.mobile-bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: 0.4rem 0.5rem calc(0.4rem + env(safe-area-inset-bottom));
  z-index: 30;
  justify-content: space-around;
}

.mobile-nav-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 0.7rem;
  font-weight: 600;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  padding: 0.35rem 0.5rem;
  border-radius: 8px;
  cursor: pointer;
}

.mobile-nav-btn.active {
  color: var(--brand-primary);
  font-weight: 700;
}

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
  }
  .sidebar {
    display: none;
  }
  .mobile-bottom-nav {
    display: flex;
  }
  .topbar {
    padding: 0.8rem 1rem;
  }
  .content-container {
    padding: 1rem;
  }
  .grid-2 {
    grid-template-columns: 1fr;
  }
}