/* =========================================
   BUTTONS
   ========================================= */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  font-family: var(--font-family);
  cursor: pointer;
  border: none;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--transition-fast), transform var(--transition-fast),
    box-shadow var(--transition-fast), opacity var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  line-height: 1.4;
}

.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-sm {
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-xs);
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-md);
  border-radius: var(--radius-lg);
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-md);
}

.btn-icon-sm {
  width: 28px;
  height: 28px;
  padding: 0;
  border-radius: var(--radius-sm);
}

.btn-primary {
  background: var(--color-primary);
  color: white;
  box-shadow: 0 2px 8px rgba(217, 119, 87, 0.30);
}
.btn-primary:hover { background: var(--color-primary-hover); box-shadow: 0 4px 14px rgba(217, 119, 87, 0.40); }

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

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary-muted);
}
.btn-outline:hover { background: var(--color-primary-light); border-color: var(--color-primary); }

.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
}
.btn-ghost:hover { background: var(--color-surface-2); color: var(--color-text); }

.btn-danger {
  background: var(--color-absent);
  color: white;
}
.btn-danger:hover { background: #DC2626; }

.btn-premium {
  background: linear-gradient(135deg, #F59E0B, #D97706);
  color: white;
  box-shadow: 0 2px 8px rgba(217, 119, 11, 0.30);
}
.btn-premium:hover { box-shadow: 0 4px 14px rgba(217, 119, 11, 0.42); }

.btn-full { width: 100%; }

/* =========================================
   CARDS
   ========================================= */

.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.card-body {
  padding: var(--space-5);
}

.card-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  font-family: var(--font-headline);
}

.card-footer {
  padding: var(--space-3) var(--space-5);
  border-top: 1px solid var(--color-border-light);
  background: var(--color-surface-2);
}

/* Stat card */
.stat-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(199, 196, 216, 0.12);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.stat-card-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.stat-card-value {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
}

.stat-card-bar {
  margin-top: var(--space-2);
  height: 4px;
  width: 100%;
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.stat-card-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  transition: width var(--transition-slow);
}

.stat-card-sub {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* Group card */
.group-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  padding: var(--space-5);
  cursor: pointer;
  transition: box-shadow var(--transition-fast), border-color var(--transition-fast),
    transform var(--transition-fast);
  text-decoration: none;
  display: block;
}

.group-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.group-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.group-card-color-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 4px;
}

.group-card-name {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  flex: 1;
}

.group-card-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.group-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* =========================================
   STUDENT ATTENDANCE CARD
   ========================================= */

.student-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  transition: box-shadow var(--transition-fast);
}

.student-card:hover {
  box-shadow: var(--shadow-sm);
}

.student-number {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.student-name {
  flex: 1;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.attendance-buttons {
  display: flex;
  gap: var(--space-1);
  flex-shrink: 0;
}

.att-btn {
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--color-border);
  background: transparent;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  font-family: var(--font-family);
  cursor: pointer;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
  min-width: 40px;
  min-height: 32px;
  text-align: center;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.att-btn:active { transform: scale(0.93); }

.att-btn[data-status="present"].active,
.att-btn[data-status="present"]:hover {
  background: var(--color-present-light);
  border-color: var(--color-present);
  color: var(--color-present);
}

.att-btn[data-status="absent"].active,
.att-btn[data-status="absent"]:hover {
  background: var(--color-absent-light);
  border-color: var(--color-absent);
  color: var(--color-absent);
}

.att-btn[data-status="late"].active,
.att-btn[data-status="late"]:hover {
  background: var(--color-late-light);
  border-color: var(--color-late);
  color: var(--color-late);
}

.att-btn[data-status="early"].active,
.att-btn[data-status="early"]:hover {
  background: var(--color-early-light);
  border-color: var(--color-early);
  color: var(--color-early);
}

/* =========================================
   BADGES
   ========================================= */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  white-space: nowrap;
}

.badge-present { background: var(--color-present-light); color: var(--color-present); }
.badge-absent  { background: var(--color-absent-light);  color: var(--color-absent);  }
.badge-late    { background: var(--color-late-light);    color: var(--color-late);    }
.badge-early   { background: var(--color-early-light);   color: var(--color-early);   }
.badge-none    { background: var(--color-surface-2);     color: var(--color-text-muted); }
.badge-primary { background: var(--color-primary-light); color: var(--color-primary); }
.badge-premium { background: var(--color-premium-light); color: var(--color-premium); }

/* =========================================
   FORM ELEMENTS
   ========================================= */

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.form-label-optional {
  font-weight: var(--font-weight-normal);
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  margin-left: var(--space-1);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
  appearance: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(217, 119, 87, 0.14);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 0.7;
}

.form-textarea {
  resize: vertical;
  min-height: 88px;
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748B' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
  cursor: pointer;
}

.form-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.form-error {
  font-size: var(--font-size-xs);
  color: var(--color-absent);
}

/* Color picker row */
.color-picker-row {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.color-swatch {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.color-swatch.selected {
  border-color: var(--color-text);
  transform: scale(1.15);
}

/* =========================================
   EMPTY STATE
   ========================================= */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-12) var(--space-6);
  gap: var(--space-3);
  color: var(--color-text-muted);
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: var(--space-2);
  opacity: 0.5;
}

.empty-state-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.empty-state-desc {
  font-size: var(--font-size-sm);
  max-width: 300px;
}

/* =========================================
   TOAST
   ========================================= */

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-text);
  color: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  pointer-events: auto;
  animation: toastIn var(--transition-base) forwards;
  max-width: 360px;
}

.toast-success { background: var(--color-present); }
.toast-error   { background: var(--color-absent); }
.toast-warning { background: var(--color-late); color: var(--color-text); }
.toast-info    { background: var(--color-primary); }

@keyframes toastIn {
  from { opacity: 0; transform: translateY(8px) scale(0.95); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateY(0) scale(1); }
  to   { opacity: 0; transform: translateY(4px) scale(0.97); }
}

.toast.hiding {
  animation: toastOut var(--transition-base) forwards;
}

/* =========================================
   PROGRESS BAR
   ========================================= */

.progress-bar {
  height: 6px;
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: var(--color-present);
  transition: width var(--transition-slow);
}

/* =========================================
   DIVIDER
   ========================================= */

.divider {
  height: 1px;
  background: var(--color-border-light);
  margin: var(--space-4) 0;
}

/* =========================================
   LIST ITEMS (Student list in sidebar, etc.)
   ========================================= */

.list-item {
  display: flex;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border-light);
  gap: var(--space-3);
  transition: background var(--transition-fast);
  min-width: 0;
  overflow: hidden;
}

.list-item:last-child {
  border-bottom: none;
}

.list-item:hover {
  background: var(--color-surface-2);
}

/* =========================================
   ATTENDANCE SUMMARY MINI (for dashboard)
   ========================================= */

.att-summary {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.att-summary-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--font-size-sm);
}

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

/* =========================================
   PREMIUM GATE OVERLAY
   ========================================= */

.premium-gate {
  position: relative;
}

.premium-gate-overlay {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(4px);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  z-index: 10;
  text-align: center;
  padding: var(--space-5);
}

.premium-gate-icon {
  font-size: 32px;
}

.premium-gate-title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.premium-gate-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* =========================================
   DATE SELECTOR
   ========================================= */

.date-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-surface-2);
  border-radius: var(--radius-md);
  padding: var(--space-1);
}

.date-nav-btn {
  width: 32px;
  height: 32px;
  border: none;
  background: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: background var(--transition-fast), color var(--transition-fast);
}

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

.date-nav-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  padding: 0 var(--space-2);
  cursor: pointer;
  color: var(--color-text);
}

/* =========================================
   TABS
   ========================================= */

.tabs {
  display: flex;
  gap: var(--space-1);
  background: var(--color-surface-2);
  border-radius: var(--radius-md);
  padding: var(--space-1);
}

.tab-btn {
  flex: 1;
  padding: var(--space-2) var(--space-3);
  border: none;
  background: none;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  font-family: var(--font-family);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.tab-btn.active {
  background: var(--color-surface);
  color: var(--color-text);
  font-weight: var(--font-weight-semibold);
  box-shadow: var(--shadow-sm);
}

/* =========================================
   LOADING SPINNER
   ========================================= */

.spinner {
  width: 24px;
  height: 24px;
  border: 2.5px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-12);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* =========================================
   CALENDAR DOTS
   ========================================= */

.cal-dot-row {
  display: flex;
  justify-content: center;
  gap: 2px;
  margin-top: 2px;
}

.cal-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
}

/* =========================================
   QUICK-MARK ALL BAR
   ========================================= */

.quick-mark-bar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-2);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.quick-mark-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-muted);
  margin-right: var(--space-1);
}

/* =========================================
   LOGIN PAGE
   ========================================= */

.login-page {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  padding: var(--space-6);
  z-index: 999;
  overflow: hidden;
}

.login-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.login-bg-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
}

.login-bg-blob--top {
  top: -15%;
  right: -10%;
  width: 480px;
  height: 480px;
  background: rgba(217, 119, 87, 0.08);
}

.login-bg-blob--bottom {
  bottom: -15%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: rgba(196, 98, 61, 0.06);
}

.login-container {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 400px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.login-brand {
  text-align: center;
  margin-bottom: var(--space-8);
}

.login-logo {
  width: 96px;
  height: 96px;
  border-radius: 22px;
  display: block;
  margin: 0 auto var(--space-5);
  box-shadow: 0 20px 40px rgba(217, 119, 87, 0.25);
  object-fit: cover;
}

.login-title {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  font-family: var(--font-headline);
  color: var(--color-text);
  letter-spacing: -0.5px;
  margin-bottom: var(--space-2);
}

.login-subtitle {
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
  font-weight: 500;
}

.login-card {
  width: 100%;
  background: var(--color-surface);
  border-radius: 28px;
  padding: var(--space-8);
  box-shadow: 0 4px 32px rgba(0, 0, 0, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.6);
}

.login-btn-google {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  padding: 15px var(--space-6);
  border: none;
  border-radius: var(--radius-lg);
  background: var(--color-surface-2);
  color: var(--color-text);
  font-size: 15px;
  font-weight: 600;
  font-family: var(--font-family);
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.login-btn-google:hover {
  background: var(--color-border);
}

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

.login-btn-google:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.login-divider {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: var(--space-5) 0;
}

.login-divider-line {
  flex: 1;
  height: 1px;
  background: var(--color-border-light);
}

.login-divider-text {
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.login-btn-guest {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 15px var(--space-6);
  border: none;
  border-radius: var(--radius-lg);
  background: none;
  color: var(--color-primary);
  font-size: 15px;
  font-weight: 600;
  font-family: var(--font-family);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.login-btn-guest:hover {
  background: var(--color-primary-light);
}

.login-legal {
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border-light);
  text-align: center;
}

.login-legal p {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  line-height: 1.7;
}

.login-legal-link {
  color: var(--color-text);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 3px;
}

.login-legal-link:hover {
  text-decoration-color: var(--color-primary);
}

/* =========================================
   FLATPICKR CALENDAR — 텍스트 색상 명시
   Android WebView 강제 다크모드 대응
   ========================================= */

.flatpickr-calendar {
  color-scheme: light;
  background: #ffffff;
  color: #1c1917;
}

.flatpickr-months .flatpickr-month,
.flatpickr-current-month .flatpickr-monthDropdown-months,
.flatpickr-current-month input.cur-year,
.flatpickr-weekday,
.flatpickr-day {
  color: #1c1917 !important;
  fill: #1c1917 !important;
}

.flatpickr-day.today {
  border-color: var(--color-primary);
}

.flatpickr-day.selected,
.flatpickr-day.selected:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff !important;
}

.flatpickr-day:hover {
  background: var(--color-primary-light);
  color: #1c1917 !important;
}

.flatpickr-day.disabled,
.flatpickr-day.disabled:hover {
  color: #a8a29e !important;
}

.numInputWrapper span.arrowUp::after,
.numInputWrapper span.arrowDown::after {
  border-bottom-color: #1c1917;
  border-top-color: #1c1917;
}