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

:root {
  --primary: #4a90d9;
  --primary-dark: #357abd;
  --success: #4caf50;
  --warning: #ff9800;
  --danger: #e53935;
  --bg: #f0f4f8;
  --card: #ffffff;
  --text: #2d3748;
  --text-light: #718096;
  --border: #e2e8f0;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding-bottom: 80px;
}

/* Header */
.header {
  background: linear-gradient(135deg, var(--primary), #6c5ce7);
  color: white;
  padding: 16px 20px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(74,144,217,0.3);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header h1 {
  font-size: 20px;
  font-weight: 700;
}

.header-sub {
  font-size: 13px;
  opacity: 0.85;
  margin-top: 2px;
}

.lang-toggle {
  background: rgba(255,255,255,0.2);
  border: 1px solid rgba(255,255,255,0.4);
  color: white;
  padding: 4px 12px;
  border-radius: 16px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.lang-toggle:hover {
  background: rgba(255,255,255,0.3);
}

/* Navigation */
.nav {
  display: flex;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--card);
  border-top: 1px solid var(--border);
  z-index: 100;
  box-shadow: 0 -2px 12px rgba(0,0,0,0.06);
}

.nav button {
  flex: 1;
  padding: 8px 2px;
  border: none;
  background: none;
  font-size: 10px;
  color: var(--text-light);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  transition: color 0.2s;
}

.nav button.active {
  color: var(--primary);
  font-weight: 600;
}

.nav button svg {
  width: 22px;
  height: 22px;
}

/* Date picker bar */
.date-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 12px 20px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}

.date-bar button {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 18px;
  color: var(--primary);
}

.date-bar .date-display {
  font-size: 16px;
  font-weight: 600;
  min-width: 180px;
  text-align: center;
  cursor: pointer;
  padding: 6px;
  border-radius: 8px;
  transition: background 0.2s;
}

.date-bar .date-display:hover {
  background: var(--bg);
}

/* Pages */
.page {
  display: none;
  padding: 16px;
  max-width: 600px;
  margin: 0 auto;
}

.page.active {
  display: block;
}

/* Cards */
.card {
  background: var(--card);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 12px;
  box-shadow: var(--shadow);
}

.card-title {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--primary-dark);
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-title .icon {
  font-size: 18px;
}

/* Toggle items */
.toggle-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toggle-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

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

.toggle-label {
  font-size: 14px;
  flex: 1;
}

.toggle-sublabel {
  font-size: 11px;
  color: var(--text-light);
  display: block;
}

/* Three-state toggle */
.tri-toggle {
  display: flex;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
  flex-shrink: 0;
}

.tri-toggle button {
  padding: 6px 12px;
  border: none;
  background: var(--bg);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
  color: var(--text-light);
}

.tri-toggle button.active {
  background: var(--primary);
  color: white;
  font-weight: 600;
}

/* Scale selector */
.scale-selector {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.scale-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: var(--bg);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  color: var(--text-light);
}

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

.scale-btn.s1.active { background: #4caf50; border-color: #4caf50; }
.scale-btn.s2.active { background: #8bc34a; border-color: #8bc34a; }
.scale-btn.s3.active { background: #ff9800; border-color: #ff9800; }
.scale-btn.s4.active { background: #ff5722; border-color: #ff5722; }
.scale-btn.s5.active { background: #e53935; border-color: #e53935; }

/* Tag inputs */
.tag-container {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 8px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: #e8f0fe;
  color: var(--primary-dark);
  padding: 4px 10px;
  border-radius: 16px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid transparent;
}

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

.tag-input-row {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.tag-input-row input {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  outline: none;
}

.tag-input-row input:focus {
  border-color: var(--primary);
}

.tag-input-row button {
  padding: 8px 16px;
  border: none;
  background: var(--primary);
  color: white;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
}

/* Textarea */
.notes-area {
  width: 100%;
  min-height: 80px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  resize: vertical;
  outline: none;
}

.notes-area:focus {
  border-color: var(--primary);
}

/* Save button */
.save-btn {
  width: 100%;
  padding: 14px;
  border: none;
  background: linear-gradient(135deg, var(--primary), #6c5ce7);
  color: white;
  font-size: 16px;
  font-weight: 700;
  border-radius: 12px;
  cursor: pointer;
  margin-top: 8px;
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.save-toast {
  position: fixed;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #2d3748;
  color: white;
  padding: 12px 24px;
  border-radius: 10px;
  font-size: 14px;
  opacity: 0;
  transition: all 0.3s;
  pointer-events: none;
  z-index: 200;
}

.save-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Calendar page */
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
  margin-top: 8px;
}

.cal-header {
  text-align: center;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-light);
  padding: 4px;
}

.cal-day {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  position: relative;
  transition: all 0.2s;
}

.cal-day:hover { background: var(--bg); }
.cal-day.today { font-weight: 700; border: 2px solid var(--primary); }
.cal-day.has-data { background: #e8f0fe; color: var(--primary-dark); font-weight: 600; }
.cal-day.selected { background: var(--primary); color: white; }
.cal-day.other-month { color: #cbd5e0; }

.cal-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
}

.cal-nav button {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 14px;
  font-size: 16px;
  cursor: pointer;
  color: var(--primary);
}

.cal-nav .month-label {
  font-size: 16px;
  font-weight: 700;
}

/* Report page */
.stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}

.stat-row:last-child { border-bottom: none; }

.stat-bar-wrap {
  flex: 1;
  margin: 0 12px;
  height: 8px;
  background: var(--bg);
  border-radius: 4px;
  overflow: hidden;
}

.stat-bar {
  height: 100%;
  border-radius: 4px;
  transition: width 0.5s ease;
}

.stat-bar.good { background: #4caf50; }
.stat-bar.neutral { background: #ff9800; }
.stat-bar.bad { background: #e53935; }

.stat-value {
  font-weight: 700;
  min-width: 40px;
  text-align: right;
}

.insight-card {
  background: linear-gradient(135deg, #e8f0fe, #f0e6ff);
  border-radius: 12px;
  padding: 14px;
  margin-bottom: 10px;
  font-size: 14px;
  line-height: 1.5;
}

.insight-card strong {
  color: var(--primary-dark);
}

.correlation-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}

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

.corr-strength {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
  flex-shrink: 0;
}

.corr-strength.strong { background: #c8e6c9; color: #2e7d32; }
.corr-strength.moderate { background: #fff3e0; color: #e65100; }
.corr-strength.weak { background: #ffebee; color: #c62828; }

/* AI Report */
.ai-report-section {
  margin-bottom: 16px;
}

.ai-report-content {
  background: var(--card);
  border-radius: 12px;
  padding: 16px;
  box-shadow: var(--shadow);
  font-size: 14px;
  line-height: 1.7;
  white-space: pre-wrap;
}

.ai-report-content h3 {
  color: var(--primary-dark);
  font-size: 15px;
  margin: 16px 0 8px;
}

.ai-report-content h3:first-child {
  margin-top: 0;
}

.ai-report-content ul {
  padding-left: 20px;
  margin: 8px 0;
}

.ai-report-content li {
  margin-bottom: 4px;
}

.generate-report-btn {
  width: 100%;
  padding: 14px;
  border: none;
  background: linear-gradient(135deg, #6c5ce7, #a855f7);
  color: white;
  font-size: 15px;
  font-weight: 700;
  border-radius: 12px;
  cursor: pointer;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: transform 0.2s;
}

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

.generate-report-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.report-loading {
  text-align: center;
  padding: 30px;
  color: var(--text-light);
}

.report-loading .spinner {
  display: inline-block;
  width: 24px;
  height: 24px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 8px;
}

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

/* Settings page */
.settings-group {
  margin-bottom: 8px;
}

.settings-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

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

.btn-outline {
  padding: 8px 16px;
  border: 1px solid var(--primary);
  background: none;
  color: var(--primary);
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
}

.btn-danger {
  padding: 8px 16px;
  border: 1px solid var(--danger);
  background: none;
  color: var(--danger);
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
}

/* Chat page */
#pageChat {
  padding: 0;
  display: none;
  height: calc(100vh - 120px);
  max-width: 600px;
  margin: 0 auto;
}

#pageChat.active {
  display: flex;
}

.chat-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  width: 100%;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chat-welcome {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-light);
}

.chat-welcome-icon {
  font-size: 48px;
  margin-bottom: 12px;
}

.chat-welcome p {
  font-size: 14px;
  line-height: 1.6;
  margin-bottom: 16px;
}

.chat-suggestions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.chat-suggestion {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 14px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
  color: var(--text);
}

.chat-suggestion:hover {
  border-color: var(--primary);
  background: #e8f0fe;
}

.chat-bubble {
  max-width: 85%;
  padding: 10px 14px;
  border-radius: 16px;
  font-size: 14px;
  line-height: 1.5;
  word-wrap: break-word;
  white-space: pre-wrap;
}

.chat-bubble.user {
  background: var(--primary);
  color: white;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}

.chat-bubble.ai {
  background: var(--card);
  color: var(--text);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
  box-shadow: var(--shadow);
}

.chat-bubble.ai .typing-dots {
  display: inline-flex;
  gap: 4px;
}

.chat-bubble.ai .typing-dots span {
  width: 6px;
  height: 6px;
  background: var(--text-light);
  border-radius: 50%;
  animation: typing 1.2s infinite;
}

.chat-bubble.ai .typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.chat-bubble.ai .typing-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
  0%, 60%, 100% { opacity: 0.3; transform: scale(0.8); }
  30% { opacity: 1; transform: scale(1); }
}

.chat-input-area {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  background: var(--card);
  border-top: 1px solid var(--border);
  align-items: flex-end;
}

.chat-input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 14px;
  font-family: inherit;
  resize: none;
  outline: none;
  max-height: 120px;
  line-height: 1.4;
}

.chat-input:focus {
  border-color: var(--primary);
}

.chat-send {
  width: 40px;
  height: 40px;
  border: none;
  background: linear-gradient(135deg, var(--primary), #6c5ce7);
  color: white;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform 0.2s;
}

.chat-send:active {
  transform: scale(0.9);
}

.chat-send svg {
  width: 18px;
  height: 18px;
}

/* Month selector for reports */
.month-selector {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 16px;
}

.month-selector button {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 14px;
  font-size: 16px;
  cursor: pointer;
  color: var(--primary);
}

.month-selector .month-label {
  font-size: 16px;
  font-weight: 700;
  min-width: 160px;
  text-align: center;
}

/* Hidden native date input */
.hidden-date {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

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

.empty-state .emoji {
  font-size: 48px;
  margin-bottom: 12px;
}

/* API key missing banner */
.api-key-banner {
  background: linear-gradient(135deg, #fff3e0, #ffe0b2);
  border-radius: 12px;
  padding: 14px;
  margin-bottom: 12px;
  font-size: 13px;
  line-height: 1.5;
  display: flex;
  align-items: center;
  gap: 10px;
}

.api-key-banner .icon { font-size: 20px; }

/* Responsive */
@media (min-width: 768px) {
  .page { padding: 24px; }
  #pageChat { padding: 0; }
  .card { padding: 20px; }
}