/* CartSplit App Styles - matching landing page design */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --green-50: #f0fdf4;
  --green-100: #dcfce7;
  --green-200: #bbf7d0;
  --green-400: #4ade80;
  --green-500: #22c55e;
  --green-600: #16a34a;
  --green-700: #15803d;
  --green-900: #14532d;
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  --amber-400: #fbbf24;
  --amber-500: #f59e0b;
  --red-500: #ef4444;
  --red-100: #fee2e2;
}

body {
  font-family: 'DM Sans', sans-serif;
  color: var(--slate-800);
  background: var(--slate-50);
  min-height: 100vh;
}

h1, h2, h3, h4 {
  font-family: 'Space Grotesk', sans-serif;
}

/* ========== AUTH SCREENS ========== */
.auth-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: linear-gradient(165deg, var(--slate-900) 0%, #0c2a1a 40%, var(--green-900) 100%);
}

.auth-card {
  background: white;
  border-radius: 20px;
  padding: 2.5rem;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
}

.auth-card .logo {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--green-600);
  margin-bottom: 0.25rem;
}

.auth-card .logo-sub {
  color: var(--slate-500);
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

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

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--slate-700);
  margin-bottom: 0.4rem;
}

.form-group input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--slate-200);
  border-radius: 10px;
  font-size: 0.95rem;
  font-family: 'DM Sans', sans-serif;
  color: var(--slate-800);
  background: var(--slate-50);
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}

.form-group input:focus {
  border-color: var(--green-500);
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.1);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: 'Space Grotesk', sans-serif;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-primary {
  background: var(--green-500);
  color: white;
  width: 100%;
}

.btn-primary:hover {
  background: var(--green-600);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(34, 197, 94, 0.3);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: var(--slate-100);
  color: var(--slate-700);
}

.btn-secondary:hover {
  background: var(--slate-200);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  border-radius: 8px;
}

.btn-danger {
  background: var(--red-100);
  color: var(--red-500);
}

.btn-danger:hover {
  background: var(--red-500);
  color: white;
}

.btn-outline {
  background: transparent;
  border: 1.5px solid var(--slate-200);
  color: var(--slate-600);
}

.btn-outline:hover {
  border-color: var(--green-500);
  color: var(--green-600);
}

.auth-toggle {
  text-align: center;
  margin-top: 1.5rem;
  color: var(--slate-500);
  font-size: 0.9rem;
}

.auth-toggle a {
  color: var(--green-600);
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}

.auth-toggle a:hover {
  text-decoration: underline;
}

.error-msg {
  background: var(--red-100);
  color: var(--red-500);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.85rem;
  margin-bottom: 1rem;
  display: none;
}

.error-msg.show {
  display: block;
}

/* ========== APP SHELL ========== */
.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.top-bar {
  background: var(--slate-900);
  padding: 0 1.5rem;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.top-bar .brand {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--green-400);
  text-decoration: none;
  cursor: pointer;
}

.top-bar-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.top-bar .user-name {
  color: var(--slate-400);
  font-size: 0.85rem;
}

.top-bar .btn-logout {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--slate-400);
  padding: 0.4rem 0.8rem;
  border-radius: 8px;
  font-size: 0.8rem;
  cursor: pointer;
  font-family: 'DM Sans', sans-serif;
}

.top-bar .btn-logout:hover {
  background: rgba(255,255,255,0.14);
  color: white;
}

.main-content {
  flex: 1;
  padding: 2rem;
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

/* ========== DASHBOARD ========== */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--slate-900);
}

.card {
  background: white;
  border-radius: 16px;
  border: 1px solid var(--slate-200);
  overflow: hidden;
}

.card-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--slate-100);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-header h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--slate-800);
}

.empty-state {
  padding: 3rem 2rem;
  text-align: center;
  color: var(--slate-400);
}

.empty-state .icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.empty-state h3 {
  color: var(--slate-600);
  margin-bottom: 0.5rem;
}

.empty-state p {
  font-size: 0.9rem;
  max-width: 300px;
  margin: 0 auto 1.5rem;
  line-height: 1.5;
}

/* List cards */
.list-cards {
  display: grid;
  gap: 1rem;
}

.list-card {
  background: white;
  border: 1px solid var(--slate-200);
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.list-card:hover {
  border-color: var(--green-400);
  box-shadow: 0 4px 12px rgba(34, 197, 94, 0.08);
  transform: translateY(-1px);
}

.list-card-info h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--slate-800);
}

.list-card-info .meta {
  display: flex;
  gap: 1rem;
  margin-top: 0.35rem;
  font-size: 0.8rem;
  color: var(--slate-400);
}

.list-card-info .meta span {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.list-card-badge {
  background: var(--green-50);
  color: var(--green-700);
  padding: 0.3rem 0.7rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
}

/* ========== JOIN LIST ========== */
.join-section {
  margin-top: 1.5rem;
}

.join-row {
  display: flex;
  gap: 0.75rem;
  align-items: stretch;
}

.join-row input {
  flex: 1;
  padding: 0.7rem 1rem;
  border: 1.5px solid var(--slate-200);
  border-radius: 10px;
  font-size: 0.95rem;
  font-family: 'DM Sans', sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  outline: none;
}

.join-row input:focus {
  border-color: var(--green-500);
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.1);
}

/* ========== LIST DETAIL ========== */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--slate-500);
  font-size: 0.85rem;
  text-decoration: none;
  cursor: pointer;
  margin-bottom: 1rem;
}

.back-link:hover {
  color: var(--green-600);
}

.list-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.list-header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--slate-900);
}

.invite-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--slate-100);
  padding: 0.5rem 1rem;
  border-radius: 10px;
  font-size: 0.85rem;
  color: var(--slate-600);
  cursor: pointer;
  transition: background 0.2s;
}

.invite-badge:hover {
  background: var(--green-50);
  color: var(--green-700);
}

.invite-badge code {
  font-family: 'Space Grotesk', monospace;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.1em;
  color: var(--green-600);
}

.members-strip {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.member-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: var(--slate-100);
  padding: 0.35rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--slate-600);
}

.member-chip .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green-400);
}

/* Add item row */
.add-item-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.add-item-row input {
  flex: 1;
  padding: 0.8rem 1rem;
  border: 1.5px solid var(--slate-200);
  border-radius: 10px;
  font-size: 0.95rem;
  font-family: 'DM Sans', sans-serif;
  outline: none;
  background: white;
}

.add-item-row input:focus {
  border-color: var(--green-500);
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.1);
}

.add-item-row .qty-input {
  width: 60px;
  text-align: center;
}

.add-item-row .price-input {
  width: 90px;
}

/* Items list */
.items-list {
  display: grid;
  gap: 0;
}

.item-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--slate-100);
  transition: background 0.15s;
}

.item-row:hover {
  background: var(--slate-50);
}

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

.item-checkbox {
  width: 22px;
  height: 22px;
  border: 2px solid var(--slate-300);
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  flex-shrink: 0;
  background: white;
}

.item-checkbox:hover {
  border-color: var(--green-500);
}

.item-checkbox.checked {
  background: var(--green-500);
  border-color: var(--green-500);
}

.item-checkbox.checked::after {
  content: '';
  width: 6px;
  height: 10px;
  border: 2px solid white;
  border-top: none;
  border-left: none;
  transform: rotate(45deg);
  margin-top: -2px;
}

.item-info {
  flex: 1;
  min-width: 0;
}

.item-name {
  font-size: 0.95rem;
  color: var(--slate-800);
}

.item-name.checked {
  text-decoration: line-through;
  color: var(--slate-400);
}

.item-meta {
  font-size: 0.75rem;
  color: var(--slate-400);
  margin-top: 0.15rem;
}

.item-price {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--slate-700);
  min-width: 50px;
  text-align: right;
}

.item-price.has-price {
  color: var(--green-600);
}

.item-delete {
  color: var(--slate-300);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 0.2rem;
  border-radius: 4px;
  transition: all 0.15s;
  line-height: 1;
}

.item-delete:hover {
  color: var(--red-500);
  background: var(--red-100);
}

/* ========== COMPLETE TRIP ========== */
.section-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--slate-800);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.trip-form {
  background: white;
  border: 1px solid var(--slate-200);
  border-radius: 16px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.trip-item-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--slate-100);
}

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

.trip-item-name {
  flex: 1;
  font-size: 0.9rem;
  color: var(--slate-700);
}

.trip-item-by {
  font-size: 0.75rem;
  color: var(--slate-400);
}

.trip-price-input {
  width: 100px;
  padding: 0.5rem 0.6rem;
  border: 1.5px solid var(--slate-200);
  border-radius: 8px;
  font-size: 0.9rem;
  font-family: 'Space Grotesk', sans-serif;
  text-align: right;
  outline: none;
}

.trip-price-input:focus {
  border-color: var(--green-500);
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.1);
}

.receipt-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  border-top: 2px solid var(--slate-200);
  margin-top: 0.5rem;
}

.receipt-label {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  color: var(--slate-700);
}

/* ========== TRIP BREAKDOWN ========== */
.breakdown-card {
  background: white;
  border: 1px solid var(--slate-200);
  border-radius: 16px;
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.breakdown-header {
  padding: 1.25rem 1.5rem;
  background: linear-gradient(135deg, var(--green-900), var(--slate-900));
  color: white;
}

.breakdown-header h3 {
  font-size: 1.1rem;
  color: white;
}

.breakdown-header .trip-date {
  font-size: 0.8rem;
  color: var(--slate-400);
  margin-top: 0.25rem;
}

.breakdown-total {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--slate-100);
  background: var(--slate-50);
}

.breakdown-total .label {
  font-size: 0.85rem;
  color: var(--slate-500);
}

.breakdown-total .amount {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--slate-900);
}

.person-breakdown {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--slate-100);
}

.person-breakdown:last-child {
  border-bottom: none;
}

.person-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.person-name {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 1rem;
  color: var(--slate-800);
}

.person-total {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--green-600);
}

.person-items {
  display: grid;
  gap: 0.3rem;
}

.person-item {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--slate-500);
}

.person-item .name { flex: 1; }
.person-item .price {
  font-family: 'Space Grotesk', sans-serif;
  color: var(--slate-600);
}

.person-bar {
  height: 6px;
  border-radius: 3px;
  background: var(--slate-100);
  margin-top: 0.5rem;
  overflow: hidden;
}

.person-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.5s ease;
}

/* Color assignments for people */
.color-0 { background: var(--green-500); }
.color-1 { background: var(--amber-500); }
.color-2 { background: #8b5cf6; }
.color-3 { background: #ec4899; }
.color-4 { background: #06b6d4; }

/* ========== TRIPS HISTORY ========== */
.trip-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--slate-100);
  cursor: pointer;
  transition: background 0.15s;
}

.trip-card:hover {
  background: var(--slate-50);
}

.trip-card:last-child {
  border-bottom: none;
}

.trip-card-info .date {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--slate-700);
}

.trip-card-info .meta {
  font-size: 0.8rem;
  color: var(--slate-400);
  margin-top: 0.15rem;
}

.trip-card-amount {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--slate-800);
}

/* ========== MODAL ========== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.modal-overlay.show {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: white;
  border-radius: 20px;
  padding: 2rem;
  width: 100%;
  max-width: 440px;
  transform: translateY(20px);
  transition: transform 0.2s;
}

.modal-overlay.show .modal {
  transform: translateY(0);
}

.modal h2 {
  font-size: 1.3rem;
  margin-bottom: 1.5rem;
  color: var(--slate-900);
}

/* ========== TABS ========== */
.tabs {
  display: flex;
  gap: 0;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--slate-200);
}

.tab {
  padding: 0.75rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--slate-500);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all 0.2s;
  font-family: 'Space Grotesk', sans-serif;
}

.tab:hover {
  color: var(--slate-700);
}

.tab.active {
  color: var(--green-600);
  border-bottom-color: var(--green-500);
}

/* ========== UTILITIES ========== */
.hidden {
  display: none !important;
}

.text-center {
  text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }

.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }

/* ========== TOAST ========== */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--slate-900);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 12px;
  font-size: 0.9rem;
  z-index: 300;
  transition: transform 0.3s ease;
  box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

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

.toast.success {
  background: var(--green-600);
}

.toast.error {
  background: var(--red-500);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 640px) {
  .main-content {
    padding: 1.25rem;
  }

  .page-header h1 {
    font-size: 1.4rem;
  }

  .list-header h1 {
    font-size: 1.4rem;
  }

  .add-item-row {
    flex-wrap: wrap;
  }

  .add-item-row input:first-child {
    flex: 1 1 100%;
  }

  .breakdown-total .amount {
    font-size: 1.2rem;
  }

  .trip-item-row {
    flex-wrap: wrap;
  }

  .join-row {
    flex-direction: column;
  }
}