/* ===== CSS VARIABLES ===== */
:root {
  --color-primary: #8b5cf6;
  --color-primary-light: #ede9fe;
  --color-primary-dark: #7c3aed;
  --color-feeding: #8b5cf6;
  --color-feeding-bg: #ede9fe;
  --color-poop: #f59e0b;
  --color-poop-bg: #fef3c7;
  --color-pee: #06b6d4;
  --color-pee-bg: #cffafe;
  --color-success: #10b981;
  --color-danger: #ef4444;
  --color-text: #1e1b4b;
  --color-text-muted: #6b7280;
  --color-bg: #f5f3ff;
  --color-surface: #ffffff;
  --color-border: #e5e7eb;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 16px rgba(139,92,246,.12);
  --shadow-lg: 0 8px 32px rgba(139,92,246,.18);
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --transition: 0.2s ease;
}

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

html {
  font-family: var(--font);
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100dvh;
  overflow-x: hidden;
}

button { cursor: pointer; border: none; background: none; font: inherit; }
input { font: inherit; outline: none; }
a { color: inherit; text-decoration: none; }

/* ===== SCREENS ===== */
.screen {
  display: none;
  min-height: 100dvh;
}

.screen.active { display: flex; flex-direction: column; }

/* ===== AUTH SCREEN ===== */
.auth-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.5rem;
  max-width: 420px;
  margin: 0 auto;
  width: 100%;
}

.auth-logo {
  font-size: 4rem;
  margin-bottom: .75rem;
  filter: drop-shadow(0 4px 8px rgba(139,92,246,.3));
}

.auth-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary-dark);
  letter-spacing: -.5px;
  margin-bottom: .25rem;
}

.auth-subtitle {
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  font-size: .95rem;
}

.auth-tabs {
  display: flex;
  gap: 0;
  background: var(--color-primary-light);
  border-radius: var(--radius-xl);
  padding: 4px;
  margin-bottom: 1.5rem;
  width: 100%;
}

.auth-tab {
  flex: 1;
  padding: .6rem 1rem;
  border-radius: var(--radius-xl);
  font-size: .9rem;
  font-weight: 600;
  color: var(--color-text-muted);
  transition: all var(--transition);
}

.auth-tab.active {
  background: var(--color-surface);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.auth-form {
  display: none;
  flex-direction: column;
  gap: .875rem;
  width: 100%;
}

.auth-form.active { display: flex; }

.input-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.input-hint {
  font-size: .75rem;
  color: var(--color-text-muted);
  padding-left: 4px;
}

.form-input {
  width: 100%;
  padding: .875rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(139,92,246,.15);
}

.form-error {
  color: var(--color-danger);
  font-size: .85rem;
  min-height: 1.2em;
  text-align: center;
}

/* ===== BUTTONS ===== */
.btn {
  padding: .875rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
}

.btn:active { transform: scale(.97); }

.btn-primary {
  background: var(--color-primary);
  color: white;
  box-shadow: 0 4px 12px rgba(139,92,246,.4);
}

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

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

.btn-secondary:hover { background: #ddd6fe; }

.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: 1.5px solid var(--color-border);
}

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

.btn-full { width: 100%; }

/* ===== APP SCREEN ===== */
#app-screen {
  background: var(--color-bg);
  padding-bottom: env(safe-area-inset-bottom, 1rem);
}

/* ===== HEADER ===== */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  padding-top: calc(1rem + env(safe-area-inset-top, 0px));
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-left { display: flex; align-items: center; gap: .6rem; }

.header-logo { font-size: 1.5rem; }

.header-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary-dark);
}

.header-actions { display: flex; gap: .5rem; }

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  background: var(--color-primary-light);
  transition: background var(--transition);
}

.icon-btn:hover { background: #ddd6fe; }

/* ===== STATS BAR ===== */
.stats-bar {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .75rem;
  padding: 1rem 1.25rem;
}

.stat-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: .875rem .75rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-card--highlight {
  background: var(--color-primary);
  color: white;
}

.stat-icon { font-size: 1.1rem; }

.stat-value {
  font-size: 1.4rem;
  font-weight: 800;
  line-height: 1;
}

.stat-label {
  font-size: .65rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: .5px;
  opacity: .7;
}

.stat-card--highlight .stat-label { opacity: .85; }

/* ===== QUICK ACTIONS ===== */
.quick-actions {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: .875rem;
  padding: 0 1.25rem 1.25rem;
}

.action-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: 1.25rem .5rem;
  border-radius: var(--radius-lg);
  font-weight: 700;
  font-size: .85rem;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.action-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0);
  transition: background var(--transition);
}

.action-btn:active {
  transform: scale(.94);
  box-shadow: var(--shadow-sm);
}

.action-btn:active::after { background: rgba(255,255,255,.15); }

.action-btn--feeding {
  background: linear-gradient(135deg, #8b5cf6, #6d28d9);
  color: white;
}

.action-btn--poop {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: white;
}

.action-btn--pee {
  background: linear-gradient(135deg, #06b6d4, #0891b2);
  color: white;
}

.action-icon { font-size: 2rem; }
.action-label { letter-spacing: .3px; }

/* ===== TIMELINE ===== */
.timeline-section {
  flex: 1;
  padding: 0 1.25rem 2rem;
}

.timeline-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.timeline-header h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
}

.timeline { display: flex; flex-direction: column; gap: 0; }

.timeline-loading {
  display: flex;
  justify-content: center;
  padding: 3rem;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--color-primary-light);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}

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

.empty-state {
  text-align: center;
  color: var(--color-text-muted);
  font-size: .95rem;
  padding: 3rem 1rem;
}

.day-group { margin-bottom: 1.25rem; }

.day-label {
  font-size: .8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-text-muted);
  margin-bottom: .625rem;
  padding: 0 4px;
}

.event-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: .875rem 1rem;
  display: flex;
  align-items: center;
  gap: .875rem;
  margin-bottom: .5rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: box-shadow var(--transition);
}

.event-card:hover { box-shadow: var(--shadow-md); }

.event-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.event-icon--feeding { background: var(--color-feeding-bg); }
.event-icon--poop { background: var(--color-poop-bg); }
.event-icon--pee { background: var(--color-pee-bg); }

.event-body { flex: 1; min-width: 0; }

.event-title {
  font-weight: 700;
  font-size: .95rem;
  margin-bottom: 2px;
}

.event-details {
  font-size: .8rem;
  color: var(--color-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.event-meta {
  text-align: right;
  flex-shrink: 0;
}

.event-time {
  font-size: .85rem;
  font-weight: 600;
  color: var(--color-text);
}

.event-ago {
  font-size: .72rem;
  color: var(--color-text-muted);
}

.event-author {
  font-size: .7rem;
  color: var(--color-primary);
  margin-top: 2px;
}

.delete-event-btn {
  position: absolute;
  top: .5rem;
  right: .5rem;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-border);
  color: var(--color-text-muted);
  font-size: .65rem;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}

.event-card:hover .delete-event-btn { opacity: 1; }

/* Touch devices: always show delete button */
@media (hover: none) {
  .delete-event-btn { opacity: 1; }
}

/* ===== MODALS ===== */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
}

.modal.active { display: block; }

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.45);
  animation: fadeIn .2s ease;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { transform: translateY(100%); } to { transform: translateY(0); } }
@keyframes scaleIn { from { transform: scale(.9); opacity: 0; } to { transform: scale(1); opacity: 1; } }

.modal-sheet {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-surface);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  padding-bottom: calc(1.5rem + env(safe-area-inset-bottom, 0px));
  max-height: 92dvh;
  overflow-y: auto;
  animation: slideUp .3s cubic-bezier(.32,1.28,.43,1.02);
}

.modal-sheet--center {
  position: absolute;
  bottom: auto;
  top: 50%;
  left: 50%;
  right: auto;
  transform: translate(-50%, -50%);
  border-radius: var(--radius-xl);
  width: calc(100% - 3rem);
  max-width: 360px;
  padding-bottom: 0;
  animation: scaleIn .2s ease;
}

.modal--small .modal-sheet--center {
  max-height: none;
}

.modal-handle {
  width: 36px;
  height: 4px;
  background: var(--color-border);
  border-radius: 2px;
  margin: 12px auto 0;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem .75rem;
  border-bottom: 1px solid var(--color-border);
}

.modal-header h3 {
  font-size: 1.1rem;
  font-weight: 700;
}

.close-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-border);
  color: var(--color-text-muted);
  font-size: .85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}

.close-btn:hover { background: #d1d5db; }

.modal-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.modal-footer {
  padding: .75rem 1.25rem 1rem;
}

.modal-footer--row {
  display: flex;
  gap: .75rem;
}

/* ===== FORM ELEMENTS ===== */
.form-group { display: flex; flex-direction: column; gap: .5rem; }

.form-label {
  font-size: .875rem;
  font-weight: 600;
  color: var(--color-text);
}

.option-group { display: flex; gap: .5rem; flex-wrap: wrap; }

.option-btn {
  flex: 1;
  min-width: max-content;
  padding: .625rem 1rem;
  border-radius: var(--radius-md);
  font-size: .875rem;
  font-weight: 600;
  border: 2px solid var(--color-border);
  color: var(--color-text-muted);
  background: var(--color-surface);
  transition: all var(--transition);
}

.option-btn.active {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
}

/* ===== FAMILY MODAL ===== */
.section-label {
  font-size: .875rem;
  font-weight: 600;
  margin-bottom: -.5rem;
}

.family-code-box {
  display: flex;
  align-items: center;
  gap: .75rem;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  padding: .875rem 1rem;
}

.family-code-text {
  flex: 1;
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: 6px;
  color: var(--color-primary-dark);
  font-family: 'Courier New', monospace;
}

.copy-btn {
  font-size: 1.2rem;
  padding: .4rem;
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition);
}

.copy-btn:active { transform: scale(.9); }

.hint-text {
  font-size: .8rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.divider {
  display: flex;
  align-items: center;
  gap: .75rem;
  color: var(--color-text-muted);
  font-size: .8rem;
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.family-members {
  margin-top: .5rem;
}

.family-member {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .625rem 0;
  border-bottom: 1px solid var(--color-border);
}

.family-member:last-child { border-bottom: none; }

.member-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 700;
  font-size: .9rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.member-name {
  font-weight: 600;
  font-size: .9rem;
}

.member-you {
  font-size: .75rem;
  color: var(--color-primary);
}

/* ===== BABY SETTINGS ===== */
.baby-settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  padding: .875rem 1rem;
  gap: .75rem;
}

.baby-settings-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.baby-settings-name {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-primary-dark);
}

.baby-settings-source {
  font-size: .8rem;
  color: var(--color-text-muted);
}

.btn-sm {
  padding: .5rem .875rem;
  font-size: .85rem;
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

/* ===== TOAST ===== */
.toast {
  position: fixed;
  bottom: calc(1.5rem + env(safe-area-inset-bottom, 0px));
  left: 50%;
  transform: translateX(-50%) translateY(calc(100% + 2rem));
  background: #1e1b4b;
  color: white;
  padding: .75rem 1.5rem;
  border-radius: var(--radius-xl);
  font-size: .9rem;
  font-weight: 500;
  z-index: 200;
  white-space: nowrap;
  box-shadow: var(--shadow-lg);
  transition: transform .3s cubic-bezier(.32,1.28,.43,1.02);
  pointer-events: none;
}

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

/* ===== RESPONSIVE ===== */
@media (min-width: 480px) {
  .quick-actions { gap: 1rem; }
  .action-btn { padding: 1.5rem 1rem; }
  .action-icon { font-size: 2.2rem; }
}

@media (min-width: 640px) {
  #app-screen {
    max-width: 520px;
    margin: 0 auto;
    box-shadow: var(--shadow-lg);
    min-height: 100dvh;
  }
  .app-header {
    border-radius: 0;
  }
}