/* ==========================================================================
   YoklamaPilot Design System
   Modern OKLCH Dark Scale (Linear / Geist Inspired)
   ========================================================================== */

:root {
  /* Surfaces & Backgrounds */
  --bg: oklch(14% 0.01 260);
  --surface: oklch(18.5% 0.015 260);
  --surface-raised: oklch(22.5% 0.02 260);
  --surface-hover: oklch(26% 0.025 260);

  /* Borders & Dividers */
  --border: oklch(28% 0.02 260);
  --border-subtle: oklch(23% 0.015 260);
  --border-focus: oklch(65% 0.19 275);

  /* Typography */
  --text: oklch(96% 0.01 260);
  --text-secondary: oklch(75% 0.02 260);
  --text-muted: oklch(60% 0.02 260);

  /* Primary Accent (Indigo) */
  --accent: oklch(65% 0.19 275);
  --accent-hover: oklch(70% 0.21 275);
  --accent-subtle: oklch(25% 0.07 275);
  --accent-text: oklch(98% 0.01 275);

  /* Semantic Status Colors */
  --success: oklch(68% 0.16 145);
  --success-subtle: oklch(24% 0.06 145);
  --success-border: oklch(35% 0.09 145);

  --warning: oklch(76% 0.16 75);
  --warning-subtle: oklch(25% 0.06 75);
  --warning-border: oklch(38% 0.09 75);

  --danger: oklch(63% 0.22 25);
  --danger-subtle: oklch(24% 0.08 25);
  --danger-border: oklch(38% 0.12 25);

  --neutral-subtle: oklch(23% 0.015 260);

  /* Fonts & Radius */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
}

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

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 14.5px;
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* Glassmorphism Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(18, 21, 28, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.2);
}

.header-container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

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

.brand-badge {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: var(--accent-subtle);
  border: 1px solid var(--accent);
  color: var(--accent-text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.brand-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.brand-subtitle {
  font-size: 12px;
  color: var(--text-muted);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  border: 1px solid transparent;
  outline: none;
  user-select: none;
}

.btn-sm {
  padding: 5px 10px;
  font-size: 12px;
}

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

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

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

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

/* Sync Badge & User Profile */
.sync-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border-radius: var(--radius-full);
  font-size: 11.5px;
  font-weight: 500;
  background: var(--surface-raised);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  user-select: none;
  transition: all 0.2s ease;
}

.sync-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: background-color 0.2s ease;
}

.sync-badge.online {
  color: var(--success);
  border-color: var(--success-border);
  background: var(--success-subtle);
}

.sync-badge.online .sync-dot {
  background: var(--success);
  box-shadow: 0 0 6px var(--success);
}

.sync-badge.syncing {
  color: var(--warning);
  border-color: var(--warning-border);
}

.sync-badge.syncing .sync-dot {
  background: var(--warning);
  animation: pulseSync 1s infinite alternate;
}

.sync-badge.error {
  color: var(--danger);
  border-color: var(--danger-border);
}

.sync-badge.error .sync-dot {
  background: var(--danger);
}

@keyframes pulseSync {
  from { opacity: 0.3; transform: scale(0.8); }
  to { opacity: 1; transform: scale(1.1); }
}

.user-profile {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 4px 8px 4px 10px;
}

.user-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  max-width: 140px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-outline-success {
  background: var(--success-subtle);
  border-color: var(--success-border);
  color: var(--success);
}

.btn-outline-success:hover {
  background: var(--success);
  color: #000;
}

.btn-outline-muted {
  background: transparent;
  border-color: var(--border);
  color: var(--text-muted);
}

.btn-outline-muted:hover {
  background: var(--surface-raised);
  color: var(--text);
}

/* Main Container */
.app-main {
  flex: 1;
  max-width: 1240px;
  width: 100%;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* Overview Stats Grid */
.overview-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: var(--shadow-sm);
}

.stat-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
}

.stat-icon-indigo { background: var(--accent-subtle); color: var(--accent); }
.stat-icon-green  { background: var(--success-subtle); color: var(--success); }
.stat-icon-amber  { background: var(--danger-subtle); color: var(--danger); }
.stat-icon-purple { background: oklch(24% 0.08 310); color: oklch(75% 0.18 310); }

.stat-info {
  display: flex;
  flex-direction: column;
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

.stat-value {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

/* Week Navigator */
.week-nav-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.section-title-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-icon {
  font-size: 20px;
  color: var(--accent);
}

.section-header h2 {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.quick-batch-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.week-tabs-scroll {
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
}

.week-tabs {
  display: flex;
  gap: 8px;
  min-width: max-content;
}

.week-tab-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--surface-raised);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
  min-width: 72px;
}

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

.week-tab-btn.active {
  border-color: var(--accent);
  background: var(--accent-subtle);
  color: var(--text);
  box-shadow: 0 0 0 1px var(--accent);
}

.week-tab-title {
  font-size: 13px;
  font-weight: 600;
}

.week-tab-status {
  font-size: 10.5px;
  color: var(--text-muted);
  margin-top: 2px;
}

.week-tab-btn.active .week-tab-status {
  color: var(--accent-text);
}

.week-tab-badge {
  font-size: 9px;
  padding: 1px 4px;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: #000;
  font-weight: 700;
  margin-top: 2px;
}

/* Active Week Lessons Section */
.active-week-section {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.active-week-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 12px;
}

.current-week-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.current-week-desc {
  font-size: 13px;
  color: var(--text-muted);
}

.status-legend {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 12px;
  color: var(--text-muted);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.dot-attended { background: var(--success); }
.dot-absent   { background: var(--danger); }
.dot-cancelled{ background: var(--warning); }
.dot-unrecorded{ background: var(--text-muted); opacity: 0.4; }

/* Lesson Cards Grid */
.week-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 16px;
}

.lesson-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: border-color 0.15s ease;
}

.lesson-card:hover {
  border-color: oklch(36% 0.03 260);
}

.lesson-card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}

.lesson-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.lesson-day-badge {
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.lesson-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.3;
}

.lesson-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 12px;
  color: var(--text-muted);
}

.lesson-meta span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 500;
}

.badge-teori {
  background: oklch(24% 0.05 240);
  color: oklch(75% 0.12 240);
  border: 1px solid oklch(32% 0.08 240);
}

.badge-lab {
  background: oklch(24% 0.07 330);
  color: oklch(78% 0.15 330);
  border: 1px solid oklch(34% 0.1 330);
}

.badge-subtle {
  background: var(--surface-raised);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

/* Action Button Group */
.attendance-actions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  background: var(--surface-raised);
  padding: 4px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.att-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 6px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 12.5px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.att-btn:hover {
  color: var(--text);
  background: var(--surface-hover);
}

.att-btn.active-attended {
  background: var(--success-subtle);
  color: var(--success);
  border: 1px solid var(--success-border);
  font-weight: 600;
}

.att-btn.active-absent {
  background: var(--danger-subtle);
  color: var(--danger);
  border: 1px solid var(--danger-border);
  font-weight: 600;
}

.att-btn.active-cancelled {
  background: var(--warning-subtle);
  color: var(--warning);
  border: 1px solid var(--warning-border);
  font-weight: 600;
}

/* Course Summary Cards */
.courses-summary-section {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.threshold-info {
  display: flex;
  gap: 8px;
}

.course-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 16px;
}

.course-summary-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.course-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 10px;
}

.course-name-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.course-stats-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.course-percent {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.course-limit-badge {
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.status-safe {
  background: var(--success-subtle);
  color: var(--success);
  border: 1px solid var(--success-border);
}

.status-warning {
  background: var(--warning-subtle);
  color: var(--warning);
  border: 1px solid var(--warning-border);
}

.status-critical {
  background: var(--danger-subtle);
  color: var(--danger);
  border: 1px solid var(--danger-border);
}

.progress-track {
  width: 100%;
  height: 6px;
  background: var(--surface-raised);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 0.3s ease, background-color 0.3s ease;
}

.course-breakdown {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
}

/* 14-Week Matrix Section */
.matrix-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.matrix-hint {
  font-size: 12.5px;
  color: var(--text-muted);
}

.table-responsive {
  overflow-x: auto;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  scrollbar-width: thin;
}

.matrix-table {
  width: 100%;
  border-collapse: collapse;
  text-align: center;
  font-size: 13px;
  min-width: 900px;
}

.matrix-table th, 
.matrix-table td {
  padding: 10px 8px;
  border: 1px solid var(--border-subtle);
}

.matrix-table thead {
  background: var(--surface-raised);
}

.matrix-table th {
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 12px;
}

.th-course {
  text-align: left;
  min-width: 180px;
  padding-left: 14px !important;
}

.th-type { width: 60px; }
.th-w { width: 38px; }
.th-stat { width: 85px; }

.td-course-name {
  text-align: left;
  font-weight: 600;
  padding-left: 14px !important;
  color: var(--text);
}

/* Matrix interactive cell */
.matrix-cell {
  cursor: pointer;
  user-select: none;
  transition: background 0.15s ease;
  font-weight: 600;
}

.matrix-cell:hover {
  background: var(--surface-hover);
}

.cell-attended {
  color: var(--success);
  background: oklch(18% 0.03 145);
}

.cell-absent {
  color: var(--danger);
  background: oklch(18% 0.05 25);
}

.cell-cancelled {
  color: var(--warning);
  background: oklch(18% 0.03 75);
}

.cell-unrecorded {
  color: var(--text-muted);
  opacity: 0.35;
}

/* Footer */
.app-footer {
  text-align: center;
  padding: 24px;
  color: var(--text-muted);
  font-size: 12px;
  border-top: 1px solid var(--border-subtle);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  background: rgba(22, 25, 32, 0.9);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-size: 13px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 8px;
  animation: slideUp 0.2s ease-out;
}

@keyframes slideUp {
  from { transform: translateY(10px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .app-main {
    padding: 16px;
    gap: 24px;
  }
  .header-container {
    padding: 12px 16px;
    flex-direction: column;
    align-items: flex-start;
  }
  .header-actions {
    align-self: flex-end;
  }
  .week-cards-grid,
  .course-cards-grid {
    grid-template-columns: 1fr;
  }
}