/* ============================================
   四維國小班級資訊查詢系統 - 前端樣式
   暖色系、手機卡片介面
   ============================================ */

:root {
  --primary: #E8734A;
  --primary-dark: #D15A30;
  --primary-light: #FFF0EB;
  --secondary: #F4A261;
  --accent: #E9C46A;
  --success: #2A9D8F;
  --warning: #E76F51;
  --danger: #E63946;
  --text: #264653;
  --text-light: #6B7280;
  --bg: #FFF8F5;
  --card-bg: #FFFFFF;
  --border: #F0E4DE;
  --shadow: 0 2px 8px rgba(232, 115, 74, 0.1);
  --radius: 12px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans TC', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Screen Management */
.screen {
  display: none;
  min-height: 100vh;
}

.screen.active {
  display: block;
}

/* Login Screen */
.login-container {
  max-width: 400px;
  margin: 0 auto;
  padding: 60px 20px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.logo {
  text-align: center;
  margin-bottom: 40px;
}

.logo-icon {
  font-size: 64px;
  margin-bottom: 16px;
}

.logo h1 {
  font-size: 28px;
  color: var(--primary);
  margin-bottom: 8px;
}

.logo p {
  color: var(--text-light);
  font-size: 14px;
}

.login-form {
  background: var(--card-bg);
  padding: 32px 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
}

.error-message {
  color: var(--danger);
  font-size: 14px;
  margin-bottom: 16px;
  min-height: 20px;
}

.test-hint {
  margin-top: 24px;
  padding: 16px;
  background: var(--primary-light);
  border-radius: 8px;
  font-size: 12px;
  color: var(--text-light);
  text-align: center;
  line-height: 1.8;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

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

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

.btn-secondary {
  background: var(--secondary);
  color: white;
}

.btn-success {
  background: var(--success);
  color: white;
}

.btn-danger {
  background: var(--danger);
  color: white;
}

.btn-ghost {
  background: transparent;
  color: white;
  padding: 8px 16px;
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 14px;
}

/* Header */
.app-header {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  padding: 16px 20px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 600px;
  margin: 0 auto;
}

.header-content h1 {
  font-size: 20px;
}

/* Tab Navigation */
.tab-nav {
  display: flex;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.tab-nav::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  flex: 1;
  min-width: fit-content;
  padding: 14px 16px;
  border: none;
  background: transparent;
  font-size: 14px;
  color: var(--text-light);
  cursor: pointer;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  transition: all 0.2s;
}

.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  font-weight: 500;
}

/* Tab Content */
.tab-content {
  padding: 16px;
  max-width: 600px;
  margin: 0 auto;
  padding-bottom: 80px;
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

/* Cards */
.card-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.card-subtitle {
  font-size: 13px;
  color: var(--text-light);
  margin-top: 4px;
}

.card-body {
  font-size: 14px;
  color: var(--text);
  line-height: 1.6;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

/* Status Badges */
.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
}

.badge-missing {
  background: #FEE2E2;
  color: var(--danger);
}

.badge-submitted {
  background: #D1FAE5;
  color: var(--success);
}

.badge-pending {
  background: #FEF3C7;
  color: #D97706;
}

/* Action Bar */
.action-bar {
  margin-bottom: 16px;
}

.action-bar .btn {
  width: 100%;
}

/* Session Timer */
.session-timer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--card-bg);
  padding: 12px 20px;
  text-align: center;
  font-size: 13px;
  color: var(--text-light);
  border-top: 1px solid var(--border);
  z-index: 50;
}

.session-timer.warning {
  color: var(--danger);
  background: #FEE2E2;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 200;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--card-bg);
  border-radius: var(--radius);
  width: 100%;
  max-width: 400px;
  max-height: 80vh;
  overflow-y: auto;
}

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

.modal-header h3 {
  font-size: 18px;
}

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-light);
}

.modal-body {
  padding: 20px;
}

/* Loading */
.loading {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.8);
  z-index: 300;
  align-items: center;
  justify-content: center;
}

.loading.active {
  display: flex;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Maintenance Screen */
.maintenance-container {
  max-width: 400px;
  margin: 0 auto;
  padding: 100px 20px;
  text-align: center;
}

.maintenance-icon {
  font-size: 80px;
  margin-bottom: 24px;
}

.maintenance-container h2 {
  color: var(--primary);
  margin-bottom: 16px;
}

.maintenance-container p {
  color: var(--text-light);
}

/* Switch */
.switch-label {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
}

.switch-label input[type="checkbox"] {
  width: 48px;
  height: 26px;
  appearance: none;
  background: var(--border);
  border-radius: 13px;
  position: relative;
  cursor: pointer;
  transition: background 0.2s;
}

.switch-label input[type="checkbox"]:checked {
  background: var(--primary);
}

.switch-label input[type="checkbox"]::after {
  content: '';
  position: absolute;
  width: 22px;
  height: 22px;
  background: white;
  border-radius: 50%;
  top: 2px;
  left: 2px;
  transition: transform 0.2s;
}

.switch-label input[type="checkbox"]:checked::after {
  transform: translateX(22px);
}

.switch-text {
  font-size: 16px;
}

.hint {
  font-size: 13px;
  color: var(--text-light);
  margin-top: 8px;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-light);
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

/* Grade Upload */
.grade-preview-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.grade-preview-table th,
.grade-preview-table td {
  padding: 8px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.grade-preview-table th {
  background: var(--primary-light);
  color: var(--primary);
}

/* File Input */
.file-input-wrapper {
  position: relative;
  overflow: hidden;
  display: inline-block;
  width: 100%;
}

.file-input-wrapper input[type=file] {
  position: absolute;
  left: 0;
  top: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}

.file-input-label {
  display: block;
  padding: 40px 20px;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  text-align: center;
  color: var(--text-light);
  cursor: pointer;
}

.file-input-label:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* Responsive */
@media (min-width: 768px) {
  .tab-content {
    padding: 24px;
  }
  
  .card {
    padding: 20px;
  }
}