/* ============================================================
   CUSTOM PROPERTIES (LIGHT THEME)
   ============================================================ */
:root {
  --color-bg:        #ffffff;
  --color-surface:   #f8f9fa;
  --color-surface-2: #f1f3f5;
  --color-accent:    #3b82f6;
  --color-accent-dk: #2563eb;
  --color-text:      #111827;
  --color-muted:     #6b7280;
  --color-border:    #e5e7eb;
  --color-success:   #10b981;
  --color-error:     #ef4444;
  --color-star:      #f59e0b;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 24px;
  --space-lg: 40px;

  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.07);
  --shadow-card-hover: 0 4px 16px rgba(0, 0, 0, 0.10);
  --transition: 200ms ease;
}

/* ============================================================
   DARK THEME
   ============================================================ */
[data-theme="dark"] {
  --color-bg:        #0f1419;
  --color-surface:   #1a212b;
  --color-surface-2: #232c38;
  --color-accent:    #60a5fa;
  --color-accent-dk: #3b82f6;
  --color-text:      #e6edf3;
  --color-muted:     #8b949e;
  --color-border:    #2d3744;
  --color-success:   #34d399;
  --color-error:     #f87171;
  --color-star:      #fbbf24;

  --shadow-card: 0 2px 10px rgba(0, 0, 0, 0.4);
  --shadow-card-hover: 0 4px 18px rgba(0, 0, 0, 0.55);
}

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

/* The [hidden] attribute must always win over display rules below
   (e.g. .modal-overlay/.field-group use display:flex which would
   otherwise override the attribute's implicit display:none). */
[hidden] { display: none !important; }

html { font-size: 16px; -webkit-font-smoothing: antialiased; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  padding: var(--space-md) var(--space-sm);
  transition: background var(--transition), color var(--transition);
}

h2 { font-size: 22px; font-weight: 700; margin-bottom: var(--space-md); letter-spacing: -0.3px; }
h3 { font-size: 16px; font-weight: 600; margin-bottom: var(--space-sm); color: var(--color-text); }

/* ============================================================
   APP CONTAINER
   ============================================================ */
#app { max-width: 620px; margin: 0 auto; }

/* ============================================================
   HEADER
   ============================================================ */
.app-header {
  text-align: center;
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-lg);
  position: relative;
}

.app-logo {
  font-size: 24px; font-weight: 800; color: var(--color-accent);
  letter-spacing: -0.5px;
  display: flex; align-items: center; justify-content: center; gap: var(--space-xs);
}
.app-logo span { font-size: 20px; }
.app-tagline { font-size: 13px; color: var(--color-muted); margin-top: 4px; }

.theme-toggle {
  position: absolute; top: 0; right: 0;
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  cursor: pointer; font-size: 17px;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
}
.theme-toggle:hover { border-color: var(--color-accent); transform: rotate(20deg); }

/* ============================================================
   RECENT TRIPS
   ============================================================ */
.recent-trips {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  margin-bottom: var(--space-md);
}
.recent-trips-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--space-xs); }
.recent-trips-header h3 { margin: 0; }
.recent-trips-list { display: flex; flex-direction: column; gap: 6px; }
.recent-trip-item {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 12px; border-radius: var(--radius-sm);
  background: var(--color-bg); border: 1px solid var(--color-border);
  cursor: pointer; transition: border-color var(--transition);
}
.recent-trip-item:hover { border-color: var(--color-accent); }
.recent-trip-name { font-weight: 600; font-size: 14px; }
.recent-trip-meta { font-size: 12px; color: var(--color-muted); }
.recent-trip-del { background: none; border: none; cursor: pointer; color: var(--color-muted); font-size: 16px; padding: 0 4px; }
.recent-trip-del:hover { color: var(--color-error); }
.link-btn { background: none; border: none; color: var(--color-accent); cursor: pointer; font-size: 13px; font-weight: 500; }
.link-btn:hover { text-decoration: underline; }

/* ============================================================
   STEP INDICATOR
   ============================================================ */
.step-indicator { display: flex; align-items: center; justify-content: center; margin-bottom: var(--space-lg); }
.step-node { display: flex; flex-direction: column; align-items: center; gap: 5px; }
.step-circle {
  width: 34px; height: 34px; border-radius: 50%;
  border: 2px solid var(--color-border);
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700;
  background: var(--color-bg); color: var(--color-muted);
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.step-node.active .step-circle {
  background: var(--color-accent); border-color: var(--color-accent); color: #fff;
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15);
}
.step-node.complete .step-circle { background: var(--color-success); border-color: var(--color-success); color: #fff; }
.step-node.complete .step-circle::after { content: '✓'; font-size: 14px; }
.step-node.complete .step-circle .step-num { display: none; }
.step-label { font-size: 11px; font-weight: 500; color: var(--color-muted); white-space: nowrap; }
.step-node.active .step-label { color: var(--color-accent); font-weight: 600; }
.step-node.complete .step-label { color: var(--color-success); }
.step-connector {
  flex: 1; height: 2px; background: var(--color-border);
  margin: 0 var(--space-xs); margin-bottom: 19px;
  min-width: 40px; max-width: 80px; transition: background 350ms ease;
}
.step-connector.complete { background: var(--color-success); }

/* ============================================================
   STEP PANELS
   ============================================================ */
.step-panel { display: none; opacity: 0; transform: translateY(10px); transition: opacity 280ms ease, transform 280ms ease; }
.step-panel--active { display: block; opacity: 1; transform: translateY(0); }

/* ============================================================
   FORM FIELDS
   ============================================================ */
.field-group { display: flex; flex-direction: column; gap: 6px; margin-bottom: var(--space-md); }
.field-group label { font-size: 13px; font-weight: 600; color: var(--color-text); letter-spacing: 0.1px; }

.input-wrap { position: relative; display: flex; align-items: center; }

.autocomplete-wrapper { position: relative; }
.autocomplete-list {
  position: absolute; top: 100%; left: 0; right: 0; z-index: 1000;
  list-style: none; margin: 0; padding: 0;
  background: var(--color-bg); border: 1.5px solid var(--color-accent);
  border-top: none; border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  max-height: 240px; overflow-y: auto; box-shadow: var(--shadow-card);
}
.autocomplete-item {
  padding: 10px 14px; cursor: pointer; font-size: 14px;
  border-bottom: 1px solid var(--color-border); transition: background var(--transition);
}
.autocomplete-item:hover { background: var(--color-surface); }
.autocomplete-item:last-child { border-bottom: none; }

input[type="text"], input[type="number"], input[type="date"], input[type="time"], select {
  padding: 11px 14px; border: 1.5px solid var(--color-border); border-radius: var(--radius-sm);
  font: inherit; font-size: 15px; color: var(--color-text); background: var(--color-bg);
  outline: none; transition: border-color var(--transition), box-shadow var(--transition); width: 100%;
}
input::placeholder { color: var(--color-muted); opacity: 0.6; }
input:focus, select:focus { border-color: var(--color-accent); box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.14); }
input.invalid { border-color: var(--color-error); box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.10); }

.valid-check {
  position: absolute; right: 12px; color: var(--color-success);
  font-weight: 700; opacity: 0; transform: scale(0.6);
  transition: opacity var(--transition), transform var(--transition); pointer-events: none;
}
.input-wrap.valid .valid-check { opacity: 1; transform: scale(1); }

.field-error { font-size: 12px; color: var(--color-error); min-height: 16px; font-weight: 500; }
.recommend-hint { font-size: 12px; color: var(--color-accent); min-height: 16px; font-weight: 600; margin-top: 4px; }

.checkbox-label { display: flex; align-items: center; gap: var(--space-xs); cursor: pointer; font-weight: 500 !important; }
.checkbox-label input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--color-accent); cursor: pointer; }

.cost-row { display: flex; gap: var(--space-sm); }
.cost-row .field-group { flex: 1; }

/* ============================================================
   TRANSPORT SELECTOR
   ============================================================ */
.transport-group { border: none; padding: 0; margin: 0 0 var(--space-md); }
.transport-group legend { font-size: 13px; font-weight: 600; color: var(--color-text); margin-bottom: var(--space-sm); }
.transport-options { display: flex; gap: var(--space-sm); flex-wrap: wrap; }
.radio-card {
  flex: 1; min-width: 90px; border: 1.5px solid var(--color-border); border-radius: var(--radius-md);
  padding: 16px 12px; text-align: center; cursor: pointer; font-size: 14px; font-weight: 600;
  transition: border-color var(--transition), background var(--transition), color var(--transition), box-shadow var(--transition);
  position: relative; background: var(--color-bg); color: var(--color-muted); user-select: none;
}
.radio-card input[type="radio"] { position: absolute; opacity: 0; pointer-events: none; width: 0; height: 0; }
.radio-card .transport-icon { display: block; font-size: 22px; margin-bottom: 5px; }
.radio-card:has(input:checked) { border-color: var(--color-accent); background: rgba(59, 130, 246, 0.05); color: var(--color-accent); box-shadow: 0 0 0 1px var(--color-accent); }
.radio-card:hover:not(:has(input:checked)) { border-color: #c4d4f5; }

/* ============================================================
   SUMMARY CARD
   ============================================================ */
.summary-card { background: var(--color-surface); border-radius: var(--radius-lg); padding: var(--space-md); box-shadow: var(--shadow-card); margin-bottom: var(--space-md); border: 1px solid var(--color-border); }
.summary-card-header { display: flex; align-items: center; gap: var(--space-xs); margin-bottom: var(--space-md); padding-bottom: var(--space-sm); border-bottom: 1px solid var(--color-border); }
.summary-card-header .destination-icon { font-size: 20px; }
.summary-destination { font-size: 18px; font-weight: 700; color: var(--color-text); }
.summary-row { display: flex; justify-content: space-between; align-items: baseline; padding: 10px 0; border-bottom: 1px solid var(--color-border); gap: var(--space-sm); }
.summary-row:last-child { border-bottom: none; }
.summary-label { font-size: 13px; color: var(--color-muted); font-weight: 500; flex-shrink: 0; }
.summary-value { font-size: 14px; font-weight: 600; text-align: right; }
.summary-row--highlight .summary-label { font-weight: 600; color: var(--color-text); font-size: 14px; }
.summary-row--highlight .summary-value { color: var(--color-accent); font-size: 18px; font-weight: 800; }
.summary-row.editable { cursor: pointer; border-radius: var(--radius-sm); transition: background var(--transition); margin: 0 -8px; padding-left: 8px; padding-right: 8px; }
.summary-row.editable:hover { background: var(--color-surface-2); }
.summary-row.editable::after { content: '✎'; font-size: 11px; color: var(--color-muted); opacity: 0; margin-left: 6px; transition: opacity var(--transition); }
.summary-row.editable:hover::after { opacity: 1; }

.summary-actions { display: flex; flex-wrap: wrap; gap: var(--space-xs); margin-bottom: var(--space-xs); }
.action-feedback { font-size: 13px; color: var(--color-success); min-height: 18px; font-weight: 600; }

/* ============================================================
   ACTIVITY SECTION
   ============================================================ */
.activity-section { margin-top: var(--space-lg); }
.activity-section-header { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: var(--space-sm); }
.activity-hint { font-size: 13px; color: var(--color-muted); margin-bottom: var(--space-md); }
.category-buttons { display: flex; flex-wrap: wrap; gap: var(--space-xs); margin-bottom: var(--space-md); }
.category-btn {
  padding: 8px 16px; border: 1.5px solid var(--color-border); border-radius: 9999px;
  background: var(--color-bg); cursor: pointer; font: inherit; font-size: 13px; font-weight: 500;
  color: var(--color-muted); transition: border-color var(--transition), background var(--transition), color var(--transition), box-shadow var(--transition); white-space: nowrap;
}
.category-btn:hover { border-color: var(--color-accent); color: var(--color-accent); }
.category-btn.active { border-color: var(--color-accent); background: var(--color-accent); color: #fff; box-shadow: 0 2px 8px rgba(59, 130, 246, 0.30); }

.activity-controls { display: flex; flex-direction: column; gap: var(--space-sm); margin-bottom: var(--space-md); }
.activity-search { width: 100%; }
.filter-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.filter-tag {
  padding: 5px 14px; border: 1.5px solid var(--color-border); border-radius: 9999px;
  background: var(--color-bg); cursor: pointer; font: inherit; font-size: 12px; font-weight: 600;
  color: var(--color-muted); transition: all var(--transition);
}
.filter-tag:hover { border-color: var(--color-accent); color: var(--color-accent); }
.filter-tag.active { background: var(--color-accent); border-color: var(--color-accent); color: #fff; }

.activity-empty { text-align: center; padding: var(--space-lg) var(--space-md); color: var(--color-muted); }
.activity-empty-icon { font-size: 36px; margin-bottom: var(--space-xs); opacity: 0.7; }
.activity-empty p { font-size: 14px; }

/* ============================================================
   ACTIVITY CARDS
   ============================================================ */
.activity-list { display: grid; grid-template-columns: 1fr; gap: var(--space-sm); }
.activity-card {
  background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md);
  padding: var(--space-md); box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition), transform var(--transition); animation: cardIn 220ms ease both;
}
.activity-card:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-1px); }
@keyframes cardIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }

.activity-card-top { display: flex; justify-content: space-between; align-items: flex-start; gap: var(--space-xs); }
.activity-card-name { font-size: 15px; font-weight: 700; margin-bottom: 5px; color: var(--color-text); }
.star-btn { background: none; border: none; cursor: pointer; font-size: 20px; line-height: 1; padding: 0; color: var(--color-border); transition: transform var(--transition), color var(--transition); flex-shrink: 0; }
.star-btn:hover { transform: scale(1.2); }
.star-btn.starred { color: var(--color-star); }

.activity-meta { display: flex; flex-wrap: wrap; gap: var(--space-xs); margin-bottom: var(--space-xs); align-items: center; }
.meta-pill { font-size: 11px; font-weight: 600; padding: 2px 8px; border-radius: 9999px; background: var(--color-surface-2); color: var(--color-muted); }
.meta-price { color: var(--color-success); }
.meta-rating { color: var(--color-star); }

.activity-card-desc { font-size: 14px; color: var(--color-muted); margin-bottom: var(--space-sm); line-height: 1.5; }
.pro-tip { font-size: 12px; background: rgba(59, 130, 246, 0.06); color: var(--color-accent-dk); border-left: 3px solid var(--color-accent); padding: 6px 10px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; line-height: 1.5; margin-bottom: var(--space-sm); }
.pro-tip-label { font-weight: 700; margin-right: 3px; }
[data-theme="dark"] .pro-tip { background: rgba(96, 165, 250, 0.10); }

.add-itinerary-btn {
  width: 100%; padding: 8px; border: 1.5px dashed var(--color-border); border-radius: var(--radius-sm);
  background: transparent; color: var(--color-accent); cursor: pointer; font: inherit; font-size: 13px; font-weight: 600;
  transition: all var(--transition);
}
.add-itinerary-btn:hover { border-color: var(--color-accent); background: rgba(59, 130, 246, 0.05); }
.add-itinerary-btn.added { border-style: solid; border-color: var(--color-success); color: var(--color-success); background: rgba(16, 185, 129, 0.06); }

/* ============================================================
   ITINERARY
   ============================================================ */
.itinerary-section { margin-top: var(--space-md); }
.itinerary-count { font-size: 12px; color: var(--color-muted); font-weight: 600; }
.itinerary-empty { text-align: center; padding: var(--space-md); color: var(--color-muted); font-size: 13px; }
.itinerary-list { display: flex; flex-direction: column; gap: var(--space-xs); }
.itinerary-item {
  display: flex; justify-content: space-between; align-items: center; gap: var(--space-xs);
  padding: 10px 14px; background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-sm); animation: cardIn 200ms ease both;
}
.itinerary-item-info { flex: 1; min-width: 0; }
.itinerary-item-name { font-size: 14px; font-weight: 600; }
.itinerary-item-cat { font-size: 11px; color: var(--color-muted); }
.itinerary-remove { background: none; border: none; cursor: pointer; color: var(--color-muted); font-size: 18px; flex-shrink: 0; }
.itinerary-remove:hover { color: var(--color-error); }

/* ============================================================
   WIZARD FOOTER & BUTTONS
   ============================================================ */
.wizard-footer { display: flex; justify-content: space-between; align-items: center; padding-top: var(--space-md); margin-top: var(--space-md); border-top: 1px solid var(--color-border); }
.btn { padding: 11px 28px; border-radius: var(--radius-sm); font: inherit; font-size: 14px; font-weight: 600; cursor: pointer; border: none; transition: background var(--transition), opacity var(--transition), box-shadow var(--transition), transform 100ms ease; outline: none; letter-spacing: 0.1px; }
.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn--sm { padding: 8px 14px; font-size: 13px; }
.btn--primary { background: var(--color-accent); color: #fff; margin-left: auto; }
.btn--primary:hover:not(:disabled) { background: var(--color-accent-dk); box-shadow: 0 3px 10px rgba(59, 130, 246, 0.30); }
.btn--ghost { background: transparent; color: var(--color-accent); border: 1.5px solid var(--color-accent); }
.btn--ghost:hover { background: rgba(59, 130, 246, 0.06); }
.btn--danger { background: transparent; color: var(--color-muted); border: 1.5px solid var(--color-border); margin-left: auto; }
.btn--danger:hover { border-color: var(--color-error); color: var(--color-error); }

.section-divider { border: none; border-top: 1px solid var(--color-border); margin: var(--space-lg) 0; }

/* ============================================================
   MODAL
   ============================================================ */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.5); display: flex; align-items: center; justify-content: center; padding: var(--space-md); z-index: 100; animation: fadeIn 180ms ease; }
.modal { background: var(--color-bg); border-radius: var(--radius-lg); padding: var(--space-md); max-width: 380px; width: 100%; box-shadow: 0 12px 40px rgba(0,0,0,0.3); animation: modalIn 220ms ease; }
.modal h3 { margin-bottom: var(--space-xs); }
.modal p { font-size: 14px; color: var(--color-muted); margin-bottom: var(--space-md); line-height: 1.5; }
.modal-actions { display: flex; gap: var(--space-xs); justify-content: flex-end; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes modalIn { from { opacity: 0; transform: scale(0.95) translateY(10px); } to { opacity: 1; transform: scale(1) translateY(0); } }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 480px) {
  body { padding: var(--space-sm); }
  h2 { font-size: 19px; }
  .radio-card { min-width: 80px; padding: 12px 8px; font-size: 13px; }
  .category-btn { padding: 7px 12px; font-size: 12px; }
  .summary-row--highlight .summary-value { font-size: 16px; }
  .step-connector { min-width: 24px; }
  .btn { padding: 10px 20px; font-size: 13px; }
  .cost-row { flex-direction: column; gap: 0; }
  .summary-actions .btn { flex: 1; min-width: 120px; }
}

/* ============================================================
   REDUCED MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

/* ============================================================
   PRINT
   ============================================================ */
@media print {
  body { padding: 0; background: #fff; color: #000; }
  .theme-toggle, .step-indicator, .wizard-footer, .recent-trips,
  .category-buttons, .activity-controls, .activity-empty, .activity-list,
  .summary-actions, .action-feedback, .add-itinerary-btn, .star-btn,
  .section-divider, .app-tagline { display: none !important; }
  .step-panel { display: block !important; opacity: 1 !important; transform: none !important; }
  #step-1, #step-2 { display: none !important; }
  .summary-card { box-shadow: none; border: 1px solid #ccc; }
  .summary-row.editable::after { display: none; }
  .activity-section { display: none; }
  .itinerary-item { break-inside: avoid; }
}