/* ============================================
   Öğrenci Ödev ve Not Takip Sistemi — Stiller
   Modern SaaS / Apple-inspired arayüz
   ============================================ */

:root {
  --bg: #f5f5f7;
  --surface: #ffffff;
  --surface-elevated: #ffffff;
  --border: rgba(0, 0, 0, 0.08);
  --text: #1d1d1f;
  --text-muted: #6e6e73;
  --primary: #0071e3;
  --primary-hover: #0077ed;
  --primary-soft: rgba(0, 113, 227, 0.12);
  --success: #34c759;
  --success-soft: rgba(52, 199, 89, 0.15);
  --danger: #ff3b30;
  --danger-soft: rgba(255, 59, 48, 0.12);
  --warning: #ff9500;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.08);
  --radius: 14px;
  --radius-sm: 10px;
  --transition: 0.2s ease;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Kabuk ve başlık */
.app-shell {
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px 20px 40px;
  padding-left: max(20px, env(safe-area-inset-left));
  padding-right: max(20px, env(safe-area-inset-right));
  padding-bottom: max(40px, env(safe-area-inset-bottom));
}

.app-header {
  margin-bottom: 28px;
}

.header-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.header-top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.brand-icon {
  font-size: 2rem;
  line-height: 1;
  padding: 10px;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.brand h1 {
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 4px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  flex-shrink: 0;
}

.header-actions .btn {
  min-height: 40px;
}

.btn-demo {
  background: linear-gradient(135deg, #0071e3, #34c759);
  color: #fff;
  font-size: 0.82rem;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
}

.btn-demo:hover {
  opacity: 0.9;
}

.btn-danger-ghost {
  background: transparent;
  color: #ff3b30;
  border: 1px solid #ff3b3040;
  font-size: 0.82rem;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
}

.btn-danger-ghost:hover {
  background: #fff0ef;
  border-color: #ff3b30;
}

.header-stats {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 20px;
  min-width: 88px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 500;
}

.stat-value {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 2px;
}

.stat-pass .stat-value {
  color: var(--success);
}

/* Ana düzen: form + tablo */
.app-main {
  display: grid;
  grid-template-columns: minmax(280px, 380px) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.panel-table {
  min-width: 0;
}

/* Tablet ve altı: dikey yığın düzen */
@media (max-width: 1024px) {
  .app-main {
    grid-template-columns: 1fr;
  }
}

.panel-forms {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow-md);
}

.card h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.card-desc {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 18px;
}

/* Form elemanları */
.form-group {
  margin-bottom: 14px;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.label-optional {
  font-weight: 400;
  font-size: 0.72rem;
  color: #aeaeb2;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.9rem;
  background: #fafafa;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  min-height: 44px;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--surface);
  box-shadow: 0 0 0 3px var(--primary-soft);
}

.form-group input.invalid {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px var(--danger-soft);
}

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

.form-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin: -4px 0 14px;
}

.form-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* Butonlar */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  min-height: 44px;
  transition: transform var(--transition), background var(--transition), opacity var(--transition);
}

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

.btn,
.btn-edit,
.btn-delete {
  touch-action: manipulation;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

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

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  background: #f0f0f2;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.78rem;
}

.hidden {
  display: none !important;
}

/* Ders listesi */
.course-list {
  list-style: none;
  margin-top: 16px;
  border-top: 1px solid var(--border);
  padding-top: 12px;
  max-height: 180px;
  overflow-y: auto;
}

.course-list:empty::after {
  content: "Henüz ders eklenmedi.";
  display: block;
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 8px 0;
}

.course-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 8px;
  margin-bottom: 4px;
  transition: background var(--transition);
}

.course-item:hover {
  background: #f5f5f7;
}

.course-item-name {
  font-size: 0.9rem;
  font-weight: 500;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.course-item-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

/* Tablo paneli */
.card-table {
  padding: 0;
  overflow: hidden;
}

.table-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 22px 16px;
  border-bottom: 1px solid var(--border);
}

.table-toolbar h2 {
  margin-bottom: 2px;
}

.toolbar-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.search-wrap {
  position: relative;
  min-width: 240px;
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.9rem;
  pointer-events: none;
  opacity: 0.5;
}

.search-wrap input {
  width: 100%;
  padding: 10px 12px 10px 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.88rem;
  background: #fafafa;
  min-height: 44px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-wrap input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
  background: var(--surface);
}

.filter-wrap select {
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.88rem;
  background: #fafafa;
  cursor: pointer;
  min-height: 44px;
}

/* Yatay kaydırma — mobilde tablo taşmasını önler */
.table-scroll {
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  width: 100%;
  max-width: 100%;
}

.data-table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.data-table thead {
  background: #fafafa;
  position: sticky;
  top: 0;
  z-index: 1;
}

.data-table th {
  text-align: left;
  padding: 14px 16px;
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  user-select: none;
}

.data-table th.sortable {
  cursor: pointer;
  transition: color var(--transition), background var(--transition);
}

.data-table th.sortable:hover {
  color: var(--primary);
  background: rgba(0, 113, 227, 0.04);
}

.sort-indicator {
  opacity: 0.4;
  font-size: 0.75rem;
  margin-left: 4px;
}

.data-table th.sort-asc .sort-indicator,
.data-table th.sort-desc .sort-indicator {
  opacity: 1;
  color: var(--primary);
}

.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

.data-table tbody tr {
  transition: background var(--transition);
}

.data-table tbody tr:hover {
  background: rgba(0, 113, 227, 0.03);
}

/* Durum rozetleri */
.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-status-beklemede {
  background: #f0f0f2;
  color: #6e6e73;
}

.badge-status-devam {
  background: rgba(0, 113, 227, 0.12);
  color: var(--primary);
}

.badge-status-tamamlandi {
  background: var(--success-soft);
  color: #248a3d;
}

.badge-status-gecikti {
  background: var(--danger-soft);
  color: var(--danger);
}

.badge-pass {
  background: var(--success-soft);
  color: #248a3d;
  margin-left: 8px;
}

.badge-fail {
  background: var(--danger-soft);
  color: var(--danger);
  margin-left: 8px;
}

.grade-cell {
  font-variant-numeric: tabular-nums;
  font-weight: 500;
}

.grade-missing,
.cell-empty {
  color: var(--text-muted);
  font-style: italic;
  font-weight: 400;
}

/* Tablo satır işlem butonları — Flexbox */
.row-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  min-width: 140px;
}

.btn-edit,
.btn-delete {
  flex: 1;
  min-width: 0;
  max-width: 72px;
  padding: 8px 10px;
  border: none;
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  min-height: 40px;
  transition: opacity var(--transition), transform var(--transition);
}

.btn-edit {
  background: rgba(0, 113, 227, 0.14);
  color: #0066cc;
}

.btn-edit:hover {
  background: rgba(0, 113, 227, 0.22);
}

.btn-delete {
  background: var(--danger-soft);
  color: #d70015;
}

.btn-delete:hover {
  background: rgba(255, 59, 48, 0.22);
}

.btn-edit:active,
.btn-delete:active {
  transform: scale(0.97);
}

.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.app-footer {
  margin-top: 32px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ============================================
   Mobil uyumluluk
   ============================================ */

/* Orta ekran: tablo yatay kaydırma */
@media (max-width: 1024px) and (min-width: 769px) {
  .table-scroll::after {
    content: "← Tabloyu kaydırın →";
    display: block;
    text-align: center;
    font-size: 0.72rem;
    color: var(--text-muted);
    padding: 8px 0 4px;
    opacity: 0.7;
  }
}

@media (max-width: 768px) {
  .app-shell {
    padding: 16px 12px 32px;
    padding-left: max(12px, env(safe-area-inset-left));
    padding-right: max(12px, env(safe-area-inset-right));
    padding-bottom: max(32px, env(safe-area-inset-bottom));
  }

  .app-header {
    margin-bottom: 20px;
  }

  .header-top {
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
  }

  .brand {
    min-width: 0;
  }

  .brand h1 {
    font-size: 1.2rem;
    line-height: 1.3;
    word-break: break-word;
  }

  .subtitle {
    font-size: 0.85rem;
  }

  .header-actions {
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .header-actions .btn {
    width: 100%;
    font-size: 0.8rem;
    padding: 10px 12px;
  }

  .header-stats {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }

  .stat-card {
    flex: 1;
    min-width: 0;
    padding: 10px 8px;
  }

  .stat-label {
    font-size: 0.68rem;
  }

  .stat-value {
    font-size: 1.2rem;
  }

  .app-main {
    gap: 16px;
  }

  .card {
    padding: 18px 16px;
  }

  .form-group input,
  .form-group select,
  .search-wrap input,
  .filter-wrap select {
    font-size: 16px; /* iOS odak zoom'unu önler */
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .form-actions {
    flex-direction: column;
  }

  .form-actions .btn {
    width: 100%;
  }

  .table-toolbar {
    flex-direction: column;
    padding: 18px 16px 14px;
  }

  .table-toolbar .card-desc {
    margin-bottom: 0;
  }

  .toolbar-controls {
    flex-direction: column;
    width: 100%;
    align-items: stretch;
  }

  .search-wrap {
    min-width: 0;
    width: 100%;
  }

  .filter-wrap {
    width: 100%;
  }

  .filter-wrap select {
    width: 100%;
  }

  /* Tablo → kart görünümü */
  .table-scroll {
    overflow-x: visible;
    margin: 0;
    padding: 0 16px 16px;
  }

  .data-table {
    min-width: 0;
    display: block;
  }

  .data-table thead {
    display: none;
  }

  .data-table tbody {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  .data-table tbody tr {
    display: block;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 14px 16px;
    box-shadow: var(--shadow-sm);
  }

  .data-table tbody tr:hover {
    background: var(--surface);
  }

  .data-table td {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.88rem;
    text-align: right;
  }

  .data-table td:first-child {
    padding-top: 0;
    font-weight: 600;
    font-size: 0.95rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 12px;
    margin-bottom: 2px;
  }

  .data-table td:first-child::before {
    display: none;
  }

  .data-table td:last-child {
    border-bottom: none;
    padding-bottom: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .data-table td:last-child::before {
    text-align: left;
    margin-bottom: 4px;
  }

  .data-table td::before {
    content: attr(data-label);
    font-weight: 600;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--text-muted);
    flex-shrink: 0;
    text-align: left;
    max-width: 45%;
  }

  .data-table td .cell-value {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-end;
    gap: 6px;
  }

  .data-table td[data-label="Ders"] {
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
  }

  .row-actions {
    min-width: 0;
    width: 100%;
  }

  .btn-edit,
  .btn-delete {
    max-width: none;
    flex: 1;
    min-height: 44px;
    font-size: 0.82rem;
  }

  .course-item {
    flex-wrap: wrap;
    padding: 10px 12px;
  }

  .course-item-actions {
    width: 100%;
    margin-top: 6px;
  }

  .course-item-actions .btn-edit,
  .course-item-actions .btn-delete {
    max-width: none;
    flex: 1;
    min-height: 44px;
  }

  .empty-state {
    padding: 32px 16px;
    font-size: 0.9rem;
  }

  .app-footer {
    margin-top: 24px;
    font-size: 0.78rem;
    padding: 0 4px;
  }
}

@media (max-width: 480px) {
  .app-shell {
    padding: 12px 10px 28px;
    padding-left: max(10px, env(safe-area-inset-left));
    padding-right: max(10px, env(safe-area-inset-right));
  }

  .brand {
    flex-direction: row;
    align-items: center;
    gap: 12px;
  }

  .brand-icon {
    font-size: 1.5rem;
    padding: 8px;
    flex-shrink: 0;
  }

  .brand h1 {
    font-size: 1.05rem;
  }

  .header-actions {
    grid-template-columns: 1fr;
  }

  .header-stats {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .stat-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-align: left;
    padding: 12px 16px;
  }

  .stat-label,
  .stat-value {
    display: inline;
  }

  .stat-value {
    font-size: 1.35rem;
  }

  .card h2 {
    font-size: 1rem;
  }

  .table-scroll {
    padding: 0 12px 12px;
  }

  .data-table tbody tr {
    padding: 12px 14px;
  }

  .data-table td::before {
    max-width: 50%;
    font-size: 0.68rem;
  }

  .badge-pass,
  .badge-fail {
    margin-left: 0;
    margin-top: 4px;
    display: inline-block;
  }
}

/* Yatay mod (küçük telefon) */
@media (max-width: 768px) and (orientation: landscape) {
  .header-stats {
    grid-template-columns: repeat(3, 1fr);
  }

  .header-actions {
    grid-template-columns: 1fr 1fr;
  }
}