:root {
  --ink: #241934;
  --ink-soft: #3A2650;
  --cream: #FBF8F3;
  --paper: #F3EFE6;
  --coral: #F2A93B;
  --coral-deep: #C1502E;
  --sage: #5C8A52;
  --sage-soft: #EAF0E6;
  --gold: #D9A64E;
  --line: #E4DED0;
  --ink-60: rgba(36,25,52,.6);
  --ink-40: rgba(36,25,52,.4);
  --font-display: 'Fraunces', serif;
  --font-body: 'Inter', -apple-system, sans-serif;
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 8px 30px rgba(36,25,52,.08);
  --shadow-lift: 0 16px 40px rgba(36,25,52,.14);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
button { font-family: inherit; cursor: pointer; }

/* ---------- Auth screen ---------- */
.auth-body {
  background: radial-gradient(120% 120% at 50% -10%, #3A2650 0%, #241934 55%, #16101F 100%);
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  padding: 32px 24px;
}
.auth-wrap {
  max-width: 380px; width: 100%;
  text-align: center;
  color: var(--cream);
}
.auth-mark {
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: .12em;
  color: var(--gold);
  margin-bottom: 6px;
}
.auth-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 52px;
  margin: 0 0 12px;
  letter-spacing: -.01em;
}
.auth-tag {
  color: rgba(251,248,243,.7);
  font-size: 15.5px;
  line-height: 1.5;
  margin-bottom: 36px;
}
.btn-google {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  background: var(--cream); color: var(--ink);
  font-weight: 600; font-size: 15px;
  padding: 15px 20px;
  border-radius: 999px;
  box-shadow: var(--shadow-lift);
  transition: transform .15s ease;
}
.btn-google:active { transform: scale(.97); }
.auth-features {
  margin-top: 44px;
  display: flex; flex-direction: column; gap: 14px;
  text-align: left;
  font-size: 14px;
  color: rgba(251,248,243,.8);
}
.auth-features div { display: flex; align-items: center; gap: 10px; }
.auth-features span { font-size: 17px; }

/* ---------- App shell ---------- */
.app-shell { max-width: 480px; margin: 0 auto; min-height: 100vh; padding-bottom: 90px; }
.app-topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px 20px 14px;
}
.brand-wordmark {
  font-family: var(--font-display); font-weight: 600; font-size: 22px; color: var(--ink);
}
.brand-wordmark small { display: block; font-family: var(--font-body); font-weight: 400; font-size: 11px; letter-spacing: .1em; color: var(--gold); text-transform: uppercase; }
.avatar { width: 38px; height: 38px; border-radius: 50%; object-fit: cover; border: 2px solid var(--cream); box-shadow: var(--shadow); }

.section-title {
  font-family: var(--font-display); font-weight: 600; font-size: 20px;
  margin: 26px 20px 12px;
}

/* ---------- Cards ---------- */
.trip-list { padding: 0 20px; display: flex; flex-direction: column; gap: 12px; }
.trip-card {
  background: var(--cream);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow);
  display: flex; align-items: center; gap: 14px;
  transition: transform .15s ease;
}
.trip-card:active { transform: scale(.98); }
.trip-icon { font-size: 26px; width: 46px; height: 46px; background: var(--sage-soft); border-radius: 14px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.trip-info { flex: 1; min-width: 0; }
.trip-name { font-weight: 600; font-size: 16px; margin-bottom: 2px; }
.trip-meta { font-size: 12.5px; color: var(--ink-60); }
.trip-balance { text-align: right; font-size: 13px; font-weight: 600; }
.trip-balance.positive { color: var(--sage); }
.trip-balance.negative { color: var(--coral-deep); }
.trip-balance.zero { color: var(--ink-40); }

.empty-state { text-align: center; padding: 60px 30px; color: var(--ink-60); }
.empty-state .emoji { font-size: 40px; margin-bottom: 10px; }

/* ---------- FAB ---------- */
.fab {
  position: fixed; right: 20px; bottom: 96px;
  width: 58px; height: 58px; border-radius: 50%;
  background: var(--coral); color: #fff;
  border: none; font-size: 26px;
  box-shadow: 0 10px 24px rgba(242,169,59,.4);
  display: flex; align-items: center; justify-content: center;
  z-index: 40;
}

/* ---------- Bottom nav ---------- */
.bottom-nav {
  position: fixed; bottom: 0; left: 0; right: 0;
  background: var(--cream);
  border-top: 1px solid var(--line);
  display: flex; justify-content: space-around;
  padding: 10px 0 max(10px, env(safe-area-inset-bottom));
  max-width: 480px; margin: 0 auto;
}
.nav-item { display: flex; flex-direction: column; align-items: center; gap: 3px; font-size: 10.5px; color: var(--ink-40); }
.nav-item.active { color: var(--coral); }
.nav-item .icon { font-size: 20px; }

/* ---------- Trip detail ---------- */
.trip-header {
  background: var(--ink);
  color: var(--cream);
  padding: 20px 20px 56px;
  border-radius: 0 0 28px 28px;
}
.trip-header-top { display: flex; align-items: center; gap: 12px; }
.back-btn { font-size: 20px; }
.trip-header h1 { font-family: var(--font-display); font-size: 24px; margin: 14px 0 4px; }
.trip-header .members-row { display: flex; margin-top: 10px; }
.member-chip { width: 30px; height: 30px; border-radius: 50%; background: var(--ink-soft); border: 2px solid var(--ink); display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 600; margin-left: -8px; color: var(--gold); }
.member-chip:first-child { margin-left: 0; }

/* Balance ring - signature element */
.balance-ring-wrap { display: flex; align-items: center; justify-content: center; margin: -46px 0 6px; position: relative; z-index: 5; }
.balance-ring-card {
  background: var(--cream); border-radius: 22px; box-shadow: var(--shadow-lift);
  padding: 18px 24px; display: flex; align-items: center; gap: 16px; width: calc(100% - 40px);
}
.ring-svg { flex-shrink: 0; }
.balance-text .label { font-size: 12px; color: var(--ink-60); margin-bottom: 2px; }
.balance-text .amount { font-family: var(--font-display); font-size: 26px; font-weight: 600; }
.balance-text .amount.positive { color: var(--sage); }
.balance-text .amount.negative { color: var(--coral-deep); }

.tab-row { display: flex; gap: 8px; padding: 18px 20px 4px; }
.tab-btn { flex: 1; text-align: center; padding: 10px; border-radius: 999px; font-size: 13.5px; font-weight: 600; background: transparent; border: 1px solid var(--line); color: var(--ink-60); }
.tab-btn.active { background: var(--ink); color: var(--cream); border-color: var(--ink); }

.expense-list { padding: 6px 20px 20px; display: flex; flex-direction: column; gap: 10px; }
.expense-row { background: var(--cream); border-radius: var(--radius-sm); padding: 14px 16px; box-shadow: var(--shadow); display: flex; align-items: center; gap: 12px; }
.expense-cat { width: 40px; height: 40px; border-radius: 12px; background: var(--paper); display: flex; align-items: center; justify-content: center; font-size: 18px; flex-shrink: 0; }
.expense-details { flex: 1; min-width: 0; }
.expense-title { font-weight: 600; font-size: 14.5px; }
.expense-sub { font-size: 12px; color: var(--ink-60); margin-top: 1px; }
.expense-amt { text-align: right; font-weight: 700; font-size: 14.5px; }

.settle-list { padding: 6px 20px 20px; display: flex; flex-direction: column; gap: 10px; }
.settle-row { background: var(--cream); border-radius: var(--radius-sm); padding: 14px 16px; box-shadow: var(--shadow); display: flex; align-items: center; justify-content: space-between; }
.settle-row .who { font-size: 14px; }
.settle-row .who b { color: var(--coral-deep); }
.settle-btn { background: var(--sage); color: #fff; border: none; padding: 12px 16px; border-radius: 999px; font-size: 12.5px; font-weight: 600; min-height: 44px; }

/* ---------- Modal / sheet ---------- */
.sheet-overlay {
  position: fixed; inset: 0; background: rgba(36,25,52,.5); z-index: 90;
  display: flex; align-items: flex-end;
  opacity: 0; pointer-events: none;
  transition: opacity .25s ease;
}
.sheet-overlay.open { opacity: 1; pointer-events: auto; }
.sheet {
  background: var(--cream); width: 100%; max-width: 480px; margin: 0 auto;
  border-radius: 24px 24px 0 0; padding: 22px 20px calc(24px + env(safe-area-inset-bottom));
  max-height: 88vh; overflow-y: auto;
  transform: translateY(100%);
  transition: transform .3s cubic-bezier(.32, .72, 0, 1);
}
.sheet-overlay.open .sheet { transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .sheet-overlay, .sheet { transition: none; }
}
.sheet h2 { font-family: var(--font-display); font-size: 20px; margin: 0 0 16px; }
.sheet .close-x { position: absolute; right: 24px; font-size: 20px; color: var(--ink-40); }

.field { margin-bottom: 14px; }
.field-row { display: flex; gap: 10px; }
.field-row .field { flex: 1; }

.toggle-row { display: flex; align-items: center; justify-content: space-between; padding: 4px 0 14px; }
.toggle-label { font-size: 14px; font-weight: 600; color: var(--ink); }
.toggle-hint { font-size: 11.5px; color: var(--ink-60); margin-top: 2px; }
.switch { position: relative; display: inline-block; width: 44px; height: 26px; flex-shrink: 0; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch-track { position: absolute; cursor: pointer; inset: 0; background: var(--line); border-radius: 999px; transition: background .15s ease; }
.switch-track::before { content: ""; position: absolute; width: 20px; height: 20px; left: 3px; top: 3px; background: #fff; border-radius: 50%; transition: transform .15s ease; box-shadow: 0 1px 3px rgba(0,0,0,.2); }
.switch input:checked + .switch-track { background: var(--coral); }
.switch input:checked + .switch-track::before { transform: translateX(18px); }

.treasurer-badge { display: inline-flex; align-items: center; gap: 5px; background: rgba(217,166,78,.18); color: var(--gold); font-size: 11px; font-weight: 600; padding: 4px 10px; border-radius: 999px; margin-top: 6px; }

.back-btn-light { font-size: 20px; color: var(--ink); }
.settings-card { background: var(--cream); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px; margin: 0 20px 20px; }
.field label { display: block; font-size: 12.5px; font-weight: 600; color: var(--ink-60); margin-bottom: 6px; }
.field input, .field select {
  width: 100%; padding: 13px 14px; border-radius: 12px; border: 1px solid var(--line);
  background: #fff; font-size: 15px; font-family: inherit; color: var(--ink);
}
.field input:focus, .field select:focus { outline: 2px solid var(--coral); outline-offset: 1px; }

.split-type-row { display: flex; gap: 8px; margin-bottom: 14px; }
.split-type-row button { flex: 1; padding: 10px 6px; border-radius: 10px; border: 1px solid var(--line); background: #fff; font-size: 12.5px; font-weight: 600; color: var(--ink-60); }
.split-type-row button.active { background: var(--ink); color: var(--cream); border-color: var(--ink); }

.member-split-row { display: flex; align-items: center; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid var(--line); }
.member-split-row:last-child { border-bottom: none; }
.member-split-row input { width: 78px; padding: 8px 10px; border-radius: 8px; border: 1px solid var(--line); text-align: right; }

.btn-primary { width: 100%; background: var(--coral); color: #fff; border: none; padding: 15px; border-radius: 14px; font-weight: 700; font-size: 15px; margin-top: 8px; }
.btn-primary:disabled { opacity: .5; }
.btn-ghost { width: 100%; background: transparent; color: var(--ink-60); border: 1px solid var(--line); padding: 13px; border-radius: 14px; font-weight: 600; font-size: 14px; margin-top: 8px; }
.btn-danger { width: 100%; background: transparent; color: var(--coral-deep); border: 1px solid var(--coral-deep); padding: 13px; border-radius: 14px; font-weight: 600; font-size: 14px; margin-top: 8px; }

.icon-btn { background: rgba(251,248,243,.12); border: none; width: 44px; height: 44px; border-radius: 50%; font-size: 18px; color: var(--cream); }
.icon-btn-light { background: var(--cream); border: 1px solid var(--line); width: 44px; height: 44px; border-radius: 50%; font-size: 17px; box-shadow: var(--shadow); }
.icon-btn-sm { background: var(--paper); border: none; width: 44px; height: 44px; border-radius: 10px; font-size: 15px; }

.export-row { display: flex; gap: 8px; justify-content: center; padding: 4px 20px 0; font-size: 12.5px; color: var(--ink-60); }
.export-row a { color: var(--coral-deep); font-weight: 600; }

.comment-list { padding: 6px 20px 12px; display: flex; flex-direction: column; gap: 14px; }
.comment-row { display: flex; gap: 10px; }
.comment-avatar { width: 32px; height: 32px; border-radius: 50%; background: var(--sage-soft); color: var(--sage); display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 700; flex-shrink: 0; }
.comment-meta { font-size: 11.5px; color: var(--ink-60); margin-bottom: 2px; }
.comment-text { font-size: 14px; line-height: 1.4; }
.comment-form { display: flex; gap: 8px; padding: 10px 20px calc(90px + env(safe-area-inset-bottom)); position: sticky; bottom: 0; background: var(--paper); }
.comment-form input { flex: 1; padding: 12px 14px; border-radius: 999px; border: 1px solid var(--line); background: #fff; font-size: 14px; }
.comment-form button { background: var(--coral); color: #fff; border: none; padding: 0 18px; border-radius: 999px; font-weight: 600; font-size: 13px; }

.toast { position: fixed; bottom: 100px; left: 50%; transform: translateX(-50%); background: var(--ink); color: var(--cream); padding: 12px 20px; border-radius: 999px; font-size: 13.5px; z-index: 200; box-shadow: var(--shadow-lift); }

/* ---------- In-app confirm dialog ---------- */
.confirm-overlay {
  position: fixed; inset: 0; background: rgba(36,25,52,.5); z-index: 120;
  display: flex; align-items: center; justify-content: center; padding: 28px;
  opacity: 0; pointer-events: none; transition: opacity .2s ease;
}
.confirm-overlay.open { opacity: 1; pointer-events: auto; }
.confirm-box {
  background: var(--cream); border-radius: 22px; padding: 24px 22px;
  width: 100%; max-width: 360px; box-shadow: var(--shadow-lift);
  transform: scale(.92) translateY(8px); transition: transform .22s cubic-bezier(.32,.72,0,1);
}
.confirm-overlay.open .confirm-box { transform: scale(1) translateY(0); }
.confirm-title { font-family: var(--font-display); font-size: 19px; font-weight: 600; margin-bottom: 8px; }
.confirm-msg { font-size: 14px; color: var(--ink-60); line-height: 1.5; margin-bottom: 20px; }
.confirm-box .btn-primary, .confirm-box .btn-danger, .confirm-box .btn-ghost { margin-top: 8px; }
@media (prefers-reduced-motion: reduce) {
  .confirm-overlay, .confirm-box { transition: none; }
}

@media (max-width: 360px) {
  .auth-title { font-size: 42px; }
}