/* ============================================================
   PlusKampus — Öğretmen Paneli Ana CSS
   Minimal & Modern Tasarım
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* --- CSS Variables --- */
:root {
  --bg: #f8fafc;
  --sidebar-bg: #0f172a;
  --sidebar-hover: #1e293b;
  --sidebar-active: #1d4ed8;
  --sidebar-text: #94a3b8;
  --sidebar-text-active: #ffffff;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-2: #475569;
  --text-3: #94a3b8;
  --primary: #3b82f6;
  --primary-dark: #1d4ed8;
  --primary-light: #eff6ff;
  --success: #22c55e;
  --success-light: #f0fdf4;
  --warning: #f59e0b;
  --warning-light: #fffbeb;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  --info: #06b6d4;
  --info-light: #ecfeff;
  --radius: 10px;
  --radius-sm: 6px;
  --radius-lg: 16px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.08), 0 4px 6px rgba(0,0,0,0.04);
  --sidebar-width: 240px;
  --header-height: 60px;
  --transition: all 0.2s ease;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 15px; -webkit-font-smoothing: antialiased; }
body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; font-family: inherit; }
input, select, textarea { font-family: inherit; }

/* --- Layout --- */
.layout {
  display: flex;
  min-height: 100vh;
}

/* --- Sidebar --- */
.sidebar {
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0;
  height: 100vh;
  z-index: 100;
  overflow-y: auto;
  overflow-x: hidden;
  transition: var(--transition);
}

.sidebar-logo {
  padding: 20px 20px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.sidebar-logo .logo-text {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.5px;
}

.sidebar-logo .logo-sub {
  font-size: 0.7rem;
  color: var(--sidebar-text);
  font-weight: 400;
  margin-top: 1px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.sidebar-nav {
  padding: 12px 0;
  flex: 1;
}

.nav-section-label {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: rgba(148,163,184,0.5);
  padding: 10px 20px 4px;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 20px;
  color: var(--sidebar-text);
  font-size: 0.875rem;
  font-weight: 450;
  transition: var(--transition);
  border-left: 3px solid transparent;
  text-decoration: none !important;
  margin: 1px 0;
}

.sidebar-link:hover {
  background: var(--sidebar-hover);
  color: #fff;
  border-left-color: rgba(59,130,246,0.4);
}

.sidebar-link.active {
  background: rgba(59,130,246,0.15);
  color: #fff;
  border-left-color: var(--primary);
}

.sidebar-link svg {
  width: 16px; height: 16px;
  flex-shrink: 0;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.sidebar-badge {
  margin-left: auto;
  background: var(--danger);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 10px;
  min-width: 18px;
  text-align: center;
}

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid rgba(255,255,255,0.06);
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: 10px;
}

.sidebar-avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

.sidebar-user-info .name {
  font-size: 0.8rem;
  font-weight: 600;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 140px;
}

.sidebar-user-info .role {
  font-size: 0.68rem;
  color: var(--sidebar-text);
}

/* --- Main Content --- */
.main {
  margin-left: var(--sidebar-width);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* --- Top Header --- */
.topbar {
  height: var(--header-height);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 50;
}

.topbar-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.topbar-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  width: 36px; height: 36px;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-2);
  transition: var(--transition);
  position: relative;
}

.icon-btn:hover { background: var(--surface-2); color: var(--text); }
.icon-btn svg { width: 16px; height: 16px; stroke: currentColor; fill: none; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; }

.icon-btn .badge {
  position: absolute;
  top: -4px; right: -4px;
  width: 14px; height: 14px;
  background: var(--danger);
  border: 2px solid var(--surface);
  border-radius: 50%;
  font-size: 0.55rem;
  font-weight: 700;
  color: #fff;
  display: flex; align-items: center; justify-content: center;
}

/* --- Page Content --- */
.content {
  flex: 1;
  padding: 24px;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  gap: 16px;
}

.page-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.4px;
}

.page-subtitle {
  font-size: 0.8rem;
  color: var(--text-3);
  margin-top: 2px;
}

/* --- Cards --- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.card-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-title svg { width: 15px; height: 15px; stroke: var(--primary); fill: none; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; }

.card-body { padding: 20px; }

/* --- Stats Grid --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.stat-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.stat-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}

.stat-icon svg { width: 20px; height: 20px; stroke: currentColor; fill: none; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; }

.stat-icon.blue { background: var(--primary-light); color: var(--primary); }
.stat-icon.green { background: var(--success-light); color: var(--success); }
.stat-icon.orange { background: var(--warning-light); color: var(--warning); }
.stat-icon.red { background: var(--danger-light); color: var(--danger); }
.stat-icon.cyan { background: var(--info-light); color: var(--info); }

.stat-info .value {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
  letter-spacing: -0.5px;
}

.stat-info .label {
  font-size: 0.75rem;
  color: var(--text-3);
  margin-top: 3px;
}

/* --- Grid Layouts --- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

/* --- Table --- */
.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

thead th {
  text-align: left;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-3);
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}

tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text-2);
  vertical-align: middle;
}

tbody tr:last-child td { border-bottom: none; }

tbody tr:hover td { background: var(--surface-2); }

.td-main {
  font-weight: 500;
  color: var(--text) !important;
}

/* --- Badges --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 9px;
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 600;
  white-space: nowrap;
}

.badge-blue { background: var(--primary-light); color: var(--primary); }
.badge-green { background: var(--success-light); color: #16a34a; }
.badge-orange { background: var(--warning-light); color: #b45309; }
.badge-red { background: var(--danger-light); color: #dc2626; }
.badge-gray { background: var(--surface-2); color: var(--text-3); }
.badge-cyan { background: var(--info-light); color: #0891b2; }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.825rem;
  font-weight: 500;
  border: 1px solid transparent;
  transition: var(--transition);
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none !important;
  line-height: 1;
}

.btn svg { width: 14px; height: 14px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

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

.btn-secondary {
  background: var(--surface);
  color: var(--text-2);
  border-color: var(--border);
}
.btn-secondary:hover { background: var(--surface-2); color: var(--text); }

.btn-success { background: var(--success); color: #fff; border-color: var(--success); }
.btn-success:hover { background: #16a34a; border-color: #16a34a; color: #fff; }

.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-danger:hover { background: #dc2626; border-color: #dc2626; color: #fff; }

.btn-sm { padding: 5px 11px; font-size: 0.775rem; }
.btn-lg { padding: 11px 22px; font-size: 0.925rem; }

.btn-group { display: flex; gap: 8px; align-items: center; }

/* --- Forms --- */
.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-2);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 9px 13px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--text);
  background: var(--surface);
  transition: var(--transition);
  outline: none;
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.1);
}

.form-control::placeholder { color: var(--text-3); }

select.form-control { cursor: pointer; }

textarea.form-control { resize: vertical; min-height: 100px; }

.form-hint { font-size: 0.72rem; color: var(--text-3); margin-top: 4px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* --- Avatar --- */
.avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

.avatar-sm { width: 28px; height: 28px; font-size: 0.65rem; }
.avatar-lg { width: 48px; height: 48px; font-size: 0.9rem; }

/* --- User Row --- */
.user-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-row .info .name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
}

.user-row .info .sub {
  font-size: 0.75rem;
  color: var(--text-3);
}

/* --- Progress --- */
.progress-bar {
  height: 6px;
  background: var(--surface-2);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 3px;
  transition: width 0.6s ease;
}

/* --- Alert / Flash --- */
.alert {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  margin-bottom: 18px;
  border: 1px solid transparent;
}

.alert svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 1px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

.alert-success { background: var(--success-light); color: #166534; border-color: #bbf7d0; }
.alert-error { background: var(--danger-light); color: #991b1b; border-color: #fecaca; }
.alert-warning { background: var(--warning-light); color: #92400e; border-color: #fde68a; }
.alert-info { background: var(--info-light); color: #155e75; border-color: #a5f3fc; }

/* --- Empty State --- */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-3);
}

.empty-state svg { width: 40px; height: 40px; margin: 0 auto 12px; stroke: var(--border); fill: none; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }

.empty-state p { font-size: 0.9rem; }
.empty-state .sub { font-size: 0.8rem; margin-top: 4px; }

/* --- Dropdown --- */
.dropdown { position: relative; display: inline-block; }
.dropdown-menu {
  position: absolute;
  right: 0; top: calc(100% + 6px);
  min-width: 180px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  z-index: 200;
  overflow: hidden;
  display: none;
}
.dropdown-menu.open { display: block; animation: fadeInDown 0.15s ease; }
.dropdown-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  font-size: 0.83rem;
  color: var(--text-2);
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none !important;
}
.dropdown-item:hover { background: var(--surface-2); color: var(--text); }
.dropdown-item svg { width: 14px; height: 14px; stroke: currentColor; fill: none; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; }
.dropdown-divider { border-top: 1px solid var(--border); margin: 4px 0; }
.dropdown-item.danger { color: var(--danger); }

/* --- Modal --- */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(2px);
  z-index: 1000;
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}
.modal-overlay.open { opacity: 1; pointer-events: all; }
.modal {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 520px;
  transform: scale(0.95);
  transition: transform 0.2s ease;
}
.modal-overlay.open .modal { transform: scale(1); }
.modal-header {
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.modal-title { font-size: 1rem; font-weight: 600; }
.modal-close {
  width: 30px; height: 30px;
  border: none; background: var(--surface-2);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--text-3);
  transition: var(--transition);
}
.modal-close:hover { color: var(--text); background: var(--border); }
.modal-close svg { width: 14px; height: 14px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.modal-body { padding: 20px 24px; }
.modal-footer { padding: 16px 24px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 10px; }

/* --- Code / Info Box --- */
.code-box {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-family: 'SFMono-Regular', Consolas, monospace;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 3px;
  text-align: center;
}

/* --- Activity Item --- */
.activity-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.activity-item:last-child { border-bottom: none; }
.activity-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--primary);
  margin-top: 6px;
  flex-shrink: 0;
}
.activity-item .text { font-size: 0.83rem; color: var(--text-2); }
.activity-item .time { font-size: 0.73rem; color: var(--text-3); margin-top: 2px; }

/* --- Login Page --- */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 100%);
  padding: 20px;
}

.auth-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 25px 50px rgba(0,0,0,0.25);
}

.auth-logo {
  text-align: center;
  margin-bottom: 28px;
}

.auth-logo .name {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.5px;
}

.auth-logo .sub {
  font-size: 0.78rem;
  color: var(--text-3);
  margin-top: 2px;
}

.auth-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}

.auth-subtitle {
  font-size: 0.82rem;
  color: var(--text-3);
  margin-bottom: 24px;
}

/* --- Animations --- */
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in { animation: fadeIn 0.3s ease; }

/* --- Responsive --- */
@media (max-width: 900px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main { margin-left: 0; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .content { padding: 16px; }
  .stats-grid { grid-template-columns: 1fr; }
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-3); }

/* --- Misc --- */
.divider { border: none; border-top: 1px solid var(--border); margin: 20px 0; }
.text-muted { color: var(--text-3); }
.text-sm { font-size: 0.8rem; }
.font-mono { font-family: 'SFMono-Regular', Consolas, monospace; }
.mt-auto { margin-top: auto; }
.ml-auto { margin-left: auto; }
.d-flex { display: flex; }
.align-center { align-items: center; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.w-full { width: 100%; }