:root {
  --color-bg: #eef3fa;
  --color-surface: #ffffff;
  --color-border: #d7e2f0;
  --color-text: #1f2d3d;
  --color-muted: #64748b;
  --color-faint: #94a3b8;
  --color-primary: #1d4e89;
  --color-primary-hover: #163c69;
  --color-primary-tint: #e4edf9;
  --color-accent: #e8944a;
  --color-accent-tint: #fdf1e6;
  --color-danger: #c0392b;
  --color-danger-tint: #fbe9e7;
  --radius-sm: 6px;
  --radius-md: 8px;
  --shadow-card: 0 1px 4px rgba(0, 0, 0, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  margin: 0;
  padding: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
}

h1, h2 {
  margin: 0 0 4px;
}

p {
  margin: 0;
}

button {
  font-family: inherit;
  cursor: pointer;
}

input, textarea {
  font-family: inherit;
}

.logo-icon {
  width: 26px;
  height: 26px;
  flex-shrink: 0;
}

/* ---- Sign-in gate ---- */

.gate {
  position: relative;
  max-width: 420px;
  margin: 80px auto;
  padding: 40px 32px;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  text-align: center;
  overflow: hidden;
}

.gate-stamp {
  position: absolute;
  top: -20px;
  right: -20px;
  width: 100px;
  height: 100px;
  color: var(--color-accent);
  opacity: 0.15;
  transform: rotate(12deg);
}

.gate h1 {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 24px;
  position: relative;
}

.gate p {
  margin-top: 12px;
  color: var(--color-muted);
  line-height: 1.5;
}

.gate button {
  margin-top: 20px;
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
}

.gate button:hover {
  background: var(--color-primary-hover);
}

/* ---- App header ---- */

.app-header {
  background: linear-gradient(135deg, var(--color-primary), #2c6bb0);
  color: #fff;
  padding: 24px 20px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.header-inner h1 {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 26px;
  color: #fff;
}

.header-inner .subtitle {
  margin-top: 4px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 14px;
  max-width: 480px;
}

.link-btn {
  background: none;
  border: none;
  color: inherit;
  text-decoration: underline;
  font-size: 14px;
  padding: 4px;
  flex-shrink: 0;
}

.app-header .link-btn {
  color: #fff;
  opacity: 0.9;
}

@media (max-width: 480px) {
  .app-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 24px 20px 40px;
}

.loading-indicator {
  text-align: center;
  color: var(--color-muted);
  padding: 40px 0;
}

/* ---- Form group ---- */

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-muted);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--color-text);
  background: #fff;
}

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

.form-group textarea {
  resize: vertical;
  min-height: 64px;
}

.field-error {
  color: var(--color-danger);
  font-size: 12px;
  margin-top: 4px;
}

/* ---- New trip form ---- */

#new-trip-section {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  padding: 20px;
  margin-bottom: 40px;
}

#newTripForm {
  display: flex;
  align-items: flex-end;
  gap: 12px;
}

#newTripForm .form-group {
  flex: 1;
  margin-bottom: 0;
}

#newTripForm button {
  padding: 11px 20px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
  white-space: nowrap;
}

#newTripForm button:hover {
  background: var(--color-primary-hover);
}

@media (max-width: 480px) {
  #newTripForm {
    flex-direction: column;
    align-items: stretch;
  }
}

/* ---- Trip list ---- */

#trips-section h2 {
  font-size: 18px;
  margin-bottom: 16px;
}

.trip-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  padding: 20px;
  margin-bottom: 16px;
  border-left: 4px solid var(--color-primary);
  display: flex;
  align-items: center;
  gap: 16px;
  cursor: pointer;
}

.trip-card-main {
  flex: 1;
  min-width: 0;
}

.trip-card-name-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.trip-card-name {
  font-size: 17px;
  font-weight: 600;
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.trip-card-name-input {
  font-size: 17px;
  font-weight: 600;
  padding: 6px 8px;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-sm);
  flex: 1;
  min-width: 0;
}

.trip-card-meta {
  margin-top: 6px;
  font-size: 13px;
  color: var(--color-muted);
}

.trip-card-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.icon-btn {
  background: none;
  border: none;
  font-size: 16px;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  line-height: 1;
}

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

.icon-btn.danger:hover {
  background: var(--color-danger-tint);
  color: var(--color-danger);
}

/* ---- Empty state ---- */

.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--color-muted);
}

.stamp-illustration {
  width: 100px;
  height: 100px;
  color: var(--color-accent);
  opacity: 0.7;
  margin-bottom: 12px;
}

/* ---- Trip detail ---- */

.trip-detail-header {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  padding: 20px;
  margin-bottom: 24px;
  display: flex;
  align-items: flex-end;
  gap: 20px;
  flex-wrap: wrap;
}

.trip-detail-header .form-group {
  flex: 1;
  min-width: 200px;
  margin-bottom: 0;
}

.trip-total {
  text-align: right;
}

.trip-total-label {
  display: block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 4px;
}

.trip-total-value {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
}

#dayList {
  margin-bottom: 24px;
}

.day-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  padding: 20px;
  margin-bottom: 16px;
  border-left: 4px solid var(--color-accent);
  transition: background-color 0.3s ease;
}

.day-card.day-card-highlight {
  background-color: var(--color-accent-tint);
}

.day-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.day-card-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
}

.day-card-subtotal {
  font-size: 13px;
  color: var(--color-muted);
  margin-left: 8px;
  font-weight: 400;
}

.day-card-row {
  display: flex;
  gap: 12px;
}

.day-card-row .form-group {
  flex: 1;
  min-width: 0;
}

@media (max-width: 480px) {
  .day-card-row {
    flex-direction: column;
    gap: 0;
  }
}

.accommodation-row {
  display: flex;
  align-items: flex-end;
  gap: 8px;
}

.accommodation-row .form-group {
  flex: 1;
  margin-bottom: 0;
}

.copy-btn {
  padding: 10px 12px;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--color-primary);
  font-size: 13px;
  white-space: nowrap;
  height: 42px;
}

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

/* ---- Links ---- */

.links-section {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid #f0f0f0;
}

.links-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-muted);
  margin-bottom: 8px;
}

.link-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 8px;
}

.link-row-fields {
  flex: 1;
  display: flex;
  gap: 8px;
  min-width: 0;
}

.link-row-fields input {
  padding: 8px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 14px;
}

.link-label-input {
  width: 35%;
}

.link-url-input {
  flex: 1;
  min-width: 0;
}

.link-row-fields input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.link-open {
  color: var(--color-accent);
  text-decoration: none;
  font-size: 13px;
  padding: 8px 4px;
  flex-shrink: 0;
}

.link-open:hover {
  text-decoration: underline;
}

@media (max-width: 480px) {
  .link-row-fields {
    flex-direction: column;
  }

  .link-label-input {
    width: 100%;
  }
}

.add-link-btn {
  background: none;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  padding: 8px 12px;
  font-size: 13px;
  width: 100%;
  margin-top: 4px;
}

.add-link-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.day-empty-state {
  text-align: center;
  color: var(--color-muted);
  padding: 24px;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  margin-bottom: 16px;
}

/* ---- Buttons ---- */

.secondary-btn {
  padding: 12px 20px;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--color-primary);
  font-weight: 600;
}

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

.danger-btn {
  padding: 12px 20px;
  border: 1px solid var(--color-danger);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--color-danger);
  font-weight: 600;
}

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

.detail-actions {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}