/* ===============================
   SplitWise — Apple-Minimal CSS
   =============================== */

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Core palette — muted, Apple-like */
  --primary: #007AFF;
  --primary-light: #409CFF;
  --primary-dark: #0055D4;
  --primary-bg: #F0F5FF;

  --teal: #34C759;
  --teal-light: #4CD964;
  --teal-dark: #248A3D;
  --teal-bg: #F0FFF4;

  --success: #34C759;
  --success-bg: #F0FFF4;
  --danger: #FF3B30;
  --danger-bg: #FFF5F5;
  --warning: #FF9500;
  --warning-bg: #FFFBF0;

  --gray-50: #FAFAFA;
  --gray-100: #F5F5F7;
  --gray-200: #E8E8ED;
  --gray-300: #D2D2D7;
  --gray-400: #AEAEB2;
  --gray-500: #8E8E93;
  --gray-600: #636366;
  --gray-700: #48484A;
  --gray-800: #2C2C2E;
  --gray-900: #1C1C1E;

  --radius: 14px;
  --radius-sm: 10px;
  --radius-lg: 20px;
  --radius-full: 999px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.10);

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', sans-serif;
  --transition: all 0.2s cubic-bezier(0.25, 0.1, 0.25, 1);
}

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

body {
  font-family: var(--font);
  color: var(--gray-800);
  background: var(--gray-100);
  line-height: 1.5;
  min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; }

/* --- Utilities --- */
.hidden { display: none !important; }
.inline-form { display: inline; }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
  letter-spacing: -0.01em;
}

.btn:active { transform: scale(0.97); }

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

.btn-ghost {
  background: transparent;
  color: var(--gray-600);
}
.btn-ghost:hover { background: var(--gray-200); }

.btn-outline {
  background: #fff;
  color: var(--gray-700);
  border: 1px solid var(--gray-300);
}
.btn-outline:hover {
  background: var(--gray-50);
  border-color: var(--gray-400);
}

.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #E0342B; }

.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: var(--teal-dark); }

.btn-sm {
  padding: 5px 10px;
  font-size: 0.75rem;
  border-radius: 8px;
}

.btn-lg {
  padding: 14px 24px;
  font-size: 0.95rem;
}

.btn-block { width: 100%; }

.btn-icon { font-size: 1.1em; }

/* --- Forms --- */
.form-group { margin-bottom: 14px; }

.form-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--gray-600);
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.form-input {
  width: 100%;
  padding: 10px 14px;
  font-family: var(--font);
  font-size: 0.9rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--gray-800);
  transition: var(--transition);
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.12);
}

.form-input::placeholder { color: var(--gray-400); }

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

.flex-1 { flex: 1; }
.flex-2 { flex: 2; }

.form-actions {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}
.form-actions .btn { flex: 1; }

/* --- Alert --- */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 16px;
  animation: slideDown 0.3s ease;
}
.alert-error {
  background: var(--danger-bg);
  color: #C62828;
  border: 1px solid #FFD5D2;
}
.alert-success {
  background: var(--success-bg);
  color: #1B5E20;
  border: 1px solid #C8E6C9;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ================================
   LANDING PAGE — Apple Split-Tab
   ================================ */
.landing-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: #fff;
}

.landing-shell {
  width: 100%;
  max-width: 440px;
}

.landing-brand {
  text-align: center;
  margin-bottom: 36px;
}

.landing-brand h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--gray-900);
  letter-spacing: -0.04em;
}

.brand-tagline {
  color: var(--gray-500);
  font-size: 0.95rem;
  margin-top: 4px;
  font-weight: 400;
}

/* Landing Tabs — pill toggle */
.landing-tabs {
  display: flex;
  background: var(--gray-100);
  padding: 3px;
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
}

.landing-tab {
  flex: 1;
  padding: 10px 16px;
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--gray-500);
  background: transparent;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

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

.landing-tab.active {
  background: #fff;
  color: var(--gray-900);
  box-shadow: var(--shadow-sm);
}

.landing-panel {
  animation: fadeIn 0.25s ease;
}

.auth-card {
  background: var(--gray-50);
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  gap: 10px;
  animation: fadeIn 0.25s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.auth-card h2 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 4px;
  letter-spacing: -0.02em;
}

.auth-subtitle {
  color: var(--gray-500);
  font-size: 0.88rem;
  margin-bottom: 6px;
}

/* ================================
   DASHBOARD
   ================================ */
.dashboard {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 16px 20px;
  min-height: 100vh;
}

/* Top Bar */
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  margin-bottom: 20px;
}

.top-bar-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.top-bar-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
  letter-spacing: -0.03em;
}

.debt-title {
  color: var(--teal-dark);
}

.top-bar-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-badge {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--gray-600);
  display: flex;
  align-items: center;
  gap: 8px;
}

.login-code-badge {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--gray-200);
  padding: 3px 8px;
  border-radius: 6px;
  cursor: pointer;
  letter-spacing: 1px;
  transition: var(--transition);
}
.login-code-badge:hover { background: var(--gray-300); }

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}

.stats-3 {
  grid-template-columns: repeat(3, 1fr);
}

.stat-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 16px 18px;
  border: 1px solid var(--gray-200);
  transition: var(--transition);
}

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

/* Stat card color variants */
.stat-highlight {
  background: var(--primary);
  border-color: var(--primary);
}
.stat-highlight .stat-label { color: rgba(255,255,255,0.7); }
.stat-highlight .stat-value { color: #fff; }

.stat-lent {
  background: var(--teal-bg);
  border-color: #C8E6C9;
}
.stat-lent .stat-value { color: var(--teal-dark); }

.stat-borrowed {
  background: var(--danger-bg);
  border-color: #FFD5D2;
}
.stat-borrowed .stat-value { color: var(--danger); }

.stat-net-positive {
  background: var(--teal-bg);
  border-color: #C8E6C9;
}
.stat-net-positive .stat-value { color: var(--teal-dark); }

.stat-net-negative {
  background: var(--danger-bg);
  border-color: #FFD5D2;
}
.stat-net-negative .stat-value { color: var(--danger); }

.stat-label {
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  color: var(--gray-500);
  margin-bottom: 4px;
}

.stat-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: -0.02em;
}

.code-value {
  font-family: 'SF Mono', 'Fira Code', monospace;
  cursor: pointer;
  letter-spacing: 2px;
}
.code-value:hover { color: var(--primary); }

/* Tabs */
.tabs { width: 100%; }

.tab-list {
  display: flex;
  gap: 2px;
  background: var(--gray-100);
  padding: 3px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  overflow-x: auto;
}

.tab-trigger {
  flex: 1;
  padding: 9px 14px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--gray-500);
  border-radius: 8px;
  text-align: center;
  transition: var(--transition);
  white-space: nowrap;
  text-decoration: none;
}

.tab-trigger:hover {
  color: var(--gray-700);
  background: rgba(255,255,255,0.5);
}

.tab-trigger.active {
  background: #fff;
  color: var(--gray-900);
  box-shadow: var(--shadow-sm);
}

.tab-content {
  animation: fadeIn 0.2s ease;
}

/* Section Cards */
.section-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 22px;
  border: 1px solid var(--gray-200);
  margin-bottom: 14px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.section-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

.section-header .section-title { margin-bottom: 0; }

.section-desc {
  font-size: 0.8rem;
  color: var(--gray-500);
  margin-top: -8px;
  margin-bottom: 14px;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 28px;
  color: var(--gray-400);
}
.empty-icon { font-size: 2rem; margin-bottom: 8px; }
.empty-state p { font-size: 0.88rem; }

/* List Items  — shared */
.expense-list, .settlement-list, .payment-list, .balance-list, .members-list, .debt-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.expense-item, .settlement-item, .payment-item, .balance-item, .member-item, .debt-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: var(--gray-50);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  border: 1px solid transparent;
}

.expense-item:hover, .settlement-item:hover, .payment-item:hover, .member-item:hover, .debt-item:hover {
  background: #fff;
  border-color: var(--gray-200);
  box-shadow: var(--shadow-sm);
}

.expense-info, .payment-info { flex: 1; min-width: 0; }

.expense-desc, .payment-flow {
  font-weight: 600;
  color: var(--gray-800);
  font-size: 0.9rem;
}

.expense-meta, .payment-meta {
  font-size: 0.75rem;
  color: var(--gray-500);
  margin-top: 2px;
}

.expense-right, .payment-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.expense-amount, .settlement-amount, .payment-amount {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--gray-900);
  font-variant-numeric: tabular-nums;
}

/* Settlements */
.settlement-arrow, .payment-flow {
  display: flex;
  align-items: center;
  gap: 8px;
}

.arrow {
  color: var(--primary);
  font-weight: 700;
  font-size: 1rem;
}

/* Balances */
.balance-member {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 500;
}

.balance-amount {
  font-weight: 600;
  font-size: 0.9rem;
}
.balance-amount.positive { color: var(--success); }
.balance-amount.negative { color: var(--danger); }
.balance-amount.settled { color: var(--gray-400); }

/* Members */
.member-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.member-name {
  font-weight: 600;
  color: var(--gray-800);
}

.member-joined {
  font-size: 0.75rem;
  color: var(--gray-400);
}

.badge {
  display: inline-block;
  background: var(--primary-bg);
  color: var(--primary);
  font-size: 0.65rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  margin-left: 6px;
}

/* Avatar */
.avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--gray-200);
  color: var(--gray-600);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.avatar-lg {
  width: 42px;
  height: 42px;
  font-size: 1rem;
}

/* Custom Split Inputs */
.custom-splits {
  background: var(--gray-50);
  padding: 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
  border: 1px solid var(--gray-200);
}

.split-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.split-member-name {
  flex: 1;
  font-weight: 500;
  font-size: 0.85rem;
}

.split-input {
  width: 120px !important;
  flex: initial !important;
}

/* Info Grid */
.info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.info-item {
  padding: 14px;
  background: var(--gray-50);
  border-radius: var(--radius-sm);
}

.info-label {
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  color: var(--gray-500);
  margin-bottom: 4px;
}

.info-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--gray-900);
}

.info-actions {
  margin-top: 20px;
  text-align: center;
}

/* ================================
   DEBT TRACKER — Extra Styles
   ================================ */

/* Filter bar */
.filter-bar {
  display: flex;
  gap: 6px;
  margin-bottom: 14px;
  overflow-x: auto;
  padding: 2px 0;
}

.filter-pill {
  padding: 6px 14px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--gray-500);
  background: var(--gray-100);
  border-radius: var(--radius-full);
  transition: var(--transition);
  white-space: nowrap;
  text-decoration: none;
}

.filter-pill:hover {
  color: var(--gray-700);
  background: var(--gray-200);
}

.filter-pill.active {
  background: var(--gray-900);
  color: #fff;
}

/* Debt items */
.debt-item {
  flex-wrap: wrap;
}

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

.debt-item-top {
  display: flex;
  gap: 8px;
  margin-bottom: 4px;
}

.debt-type-badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}
.debt-type-badge.lent {
  background: var(--success-bg);
  color: var(--teal-dark);
}
.debt-type-badge.borrowed {
  background: var(--danger-bg);
  color: var(--danger);
}

.debt-status-badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  text-transform: capitalize;
}
.debt-status-badge.pending {
  background: var(--warning-bg);
  color: var(--warning);
}
.debt-status-badge.partial {
  background: #EDE7F6;
  color: #5E35B1;
}
.debt-status-badge.paid {
  background: var(--success-bg);
  color: var(--teal-dark);
}

.debt-item-name {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--gray-800);
  display: flex;
  align-items: center;
  gap: 8px;
}

.debt-item-phone {
  font-weight: 400;
  font-size: 0.78rem;
  color: var(--gray-400);
  margin-left: 4px;
}

.debt-item-reason {
  font-size: 0.8rem;
  color: var(--gray-500);
  margin-top: 2px;
}

.debt-item-meta {
  font-size: 0.72rem;
  color: var(--gray-400);
  margin-top: 2px;
}

.debt-item-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.debt-item-amount {
  font-weight: 700;
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}
.debt-item-amount.lent { color: var(--teal-dark); }
.debt-item-amount.borrowed { color: var(--danger); }

.debt-item-actions {
  display: flex;
  gap: 4px;
}

/* Contact balance in contact list */
.contact-balance {
  font-weight: 600;
  font-size: 0.9rem;
}
.contact-balance .positive { color: var(--success); }
.contact-balance .negative { color: var(--danger); }
.contact-balance .settled { color: var(--gray-400); }

/* Edit inline forms */
.edit-inline {
  padding: 16px;
  background: var(--gray-50);
  border-radius: var(--radius-sm);
  border: 1px solid var(--gray-200);
  margin-bottom: 6px;
  animation: fadeIn 0.2s ease;
}

/* Summary tab */
.summary-item {
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
}

.summary-row {
  font-size: 0.8rem;
  color: var(--gray-600);
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 4px;
}

.summary-label {
  color: var(--gray-500);
  font-weight: 400;
}

.summary-sep {
  color: var(--gray-300);
}

.positive { color: var(--success); font-weight: 600; }
.negative { color: var(--danger); font-weight: 600; }
.settled { color: var(--gray-400); font-weight: 500; }

/* Error Page */
.error-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.error-card {
  text-align: center;
  background: #fff;
  padding: 48px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.error-card .error-icon { font-size: 3rem; margin-bottom: 16px; }
.error-card h1 { font-size: 1.5rem; margin-bottom: 8px; color: var(--gray-900); }
.error-card p { color: var(--gray-500); margin-bottom: 24px; }

/* ================================
   RESPONSIVE
   ================================ */
@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats-3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .form-row {
    flex-direction: column;
    gap: 0;
  }

  .tab-list { gap: 2px; }

  .tab-trigger {
    padding: 8px 10px;
    font-size: 0.75rem;
  }

  .info-grid {
    grid-template-columns: 1fr;
  }

  .stat-value {
    font-size: 1.05rem;
  }

  .dashboard {
    padding: 12px;
  }

  .section-card {
    padding: 16px;
  }

  .expense-item, .settlement-item, .payment-item, .balance-item, .member-item, .debt-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .expense-right, .payment-right, .debt-item-right {
    align-self: flex-end;
  }

  .settlement-item {
    flex-direction: row;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .landing-brand h1 {
    font-size: 1.7rem;
  }

  .auth-card {
    padding: 22px;
  }

  .top-bar {
    flex-direction: column;
    gap: 10px;
    text-align: center;
  }
  .top-bar-right {
    justify-content: center;
  }

  .stats-3 {
    grid-template-columns: 1fr;
  }
}