:root {
  --bg: #f7f5f0;
  --surface: #ffffff;
  --surface2: #f0ede8;
  --border: #ddd8d0;
  --accent: #c84b2f;
  --accent2: #2f7bc8;
  --text: #1a1a1a;
  --muted: #888880;
  --danger: #c84b2f;
  --green: #2a8a4a;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Noto Sans TC', sans-serif;
  min-height: 100vh;
  padding: 28px max(16px, env(safe-area-inset-right)) max(60px, calc(40px + env(safe-area-inset-bottom))) max(16px, env(safe-area-inset-left));
  max-width: 680px;
  margin: 0 auto;
}
#setupScreen { display: block; }
#mainScreen  { display: none; }

/* ── Logo ── */
.logo    { font-family: 'Space Mono', monospace; font-size: 1.8rem; letter-spacing: -1px; color: var(--accent); margin-bottom: 4px; }
.tagline { color: var(--muted); font-size: 0.85rem; margin-bottom: 8px; }

/* ── Setup cards ── */
.setup-card   { background: var(--surface); border: 1.5px solid var(--border); border-radius: 16px; padding: 28px 24px; margin-bottom: 16px; }
.setup-card h2 { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 2px; color: var(--muted); margin-bottom: 18px; }
.name-grid       { display: flex; flex-direction: column; gap: 10px; }
.name-field      { display: flex; align-items: center; gap: 8px; }
.name-input-wrap { position: relative; flex: 1; }
.name-input-wrap .num {
  position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
  width: 22px; height: 22px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: 'Space Mono', monospace; font-size: 0.7rem; font-weight: 700; color: #fff;
}
.name-input-wrap input[type="text"] {
  width: 100%; padding: 10px 12px 10px 42px !important;
  background: var(--surface2); border: 1.5px solid var(--border); border-radius: 10px;
  color: var(--text); font-family: 'Noto Sans TC', sans-serif; font-size: 0.95rem; outline: none;
  transition: border-color 0.2s;
}
.name-input-wrap input[type="text"]:focus { border-color: var(--accent); }
.btn-remove {
  background: none; border: 1.5px solid var(--border); border-radius: 8px;
  color: var(--muted); cursor: pointer; font-size: 0.82rem;
  width: 44px; height: 44px; padding: 0; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.15s;
}
.btn-remove:hover { border-color: var(--danger); color: var(--danger); }
.btn-add-member {
  width: 100%; padding: 9px; margin-top: 4px;
  background: none; border: 1.5px dashed var(--border);
  border-radius: 10px; color: var(--muted); cursor: pointer;
  font-size: 0.85rem; font-family: 'Noto Sans TC', sans-serif;
  transition: all 0.15s;
}
.btn-add-member:hover { border-color: var(--accent2); color: var(--accent2); }

/* ── Pills / checks ── */
.p-check {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px; border-radius: 6px; cursor: pointer; font-size: 0.85rem;
  border: 1.5px solid var(--border); background: var(--surface2);
  user-select: none; transition: all 0.15s; margin: 3px;
}
.p-check.on { border-color: var(--accent2); background: rgba(47,123,200,0.08); color: var(--accent2); }

/* ── Start button ── */
.btn-start {
  width: 100%; padding: 14px; background: var(--accent); color: #fff; border: none;
  border-radius: 12px; font-size: 1rem; font-weight: 700;
  font-family: 'Noto Sans TC', sans-serif; cursor: pointer; margin-top: 8px;
  letter-spacing: 1px; transition: opacity 0.2s;
}
.btn-start:hover { opacity: 0.85; }

/* ── Share banner ── */
.share-banner {
  display: flex; align-items: center; gap: 8px;
  background: var(--surface); border: 1.5px solid var(--border);
  border-radius: 10px; padding: 10px 14px; margin-bottom: 16px;
}

/* ── Sync status ── */
.sync-status {
  display: flex; align-items: center; gap: 6px;
  font-size: 0.75rem; color: var(--muted);
  margin-bottom: 12px; padding: 0 2px;
}
.sync-dot {
  width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0;
}
.sync-dot--on  { background: #2a8a4a; box-shadow: 0 0 0 2px #2a8a4a33; }
.sync-dot--off { background: #888; }
.sync-resume {
  background: none; border: 1px solid var(--border); border-radius: 6px;
  color: var(--muted); font-size: 0.72rem; padding: 2px 8px;
  cursor: pointer; margin-left: 4px;
}
.sync-resume:hover { color: var(--text); border-color: var(--text); }

/* ── Topbar ── */
.topbar { display: flex; align-items: center; gap: 10px; margin-bottom: 22px; }
.topbar .title { font-family: 'Space Mono', monospace; font-size: 1.1rem; letter-spacing: -1px; flex: 1; }
.member-pills  { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 4px; }
.mpill { display: inline-flex; align-items: center; gap: 5px; font-size: 0.8rem; padding: 3px 10px; border-radius: 20px; font-weight: 500; color: #fff; }
.back-btn { background: none; border: none; color: var(--muted); cursor: pointer; font-size: 0.82rem; text-decoration: underline; flex-shrink: 0; padding: 10px 8px; }

/* ── Cards ── */
.card       { background: var(--surface); border: 1.5px solid var(--border); border-radius: 14px; padding: 20px; margin-bottom: 14px; }
.card-title { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 2px; color: var(--muted); margin-bottom: 16px; font-weight: 500; }

/* ── Form elements ── */
.form-row   { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.form-field { display: flex; flex-direction: column; gap: 4px; }
.form-field label { font-size: 0.75rem; color: var(--muted); }
.form-field.grow  { flex: 1; min-width: 120px; }
input[type="text"], input[type="number"], select {
  background: var(--surface2); border: 1.5px solid var(--border); border-radius: 8px;
  color: var(--text); padding: 8px 10px; font-family: 'Noto Sans TC', sans-serif;
  font-size: 0.9rem; outline: none; transition: border-color 0.2s;
}
input:focus, select:focus { border-color: var(--accent2); }
select { cursor: pointer; }

/* ── Rate inputs ── */
.rate-row  { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; }
.rate-item { display: flex; flex-direction: column; gap: 4px; }
.rate-item label { font-size: 0.72rem; color: var(--muted); }
.rate-item input  { width: 90px; }

/* ── Split tabs ── */
.split-tabs { display: flex; gap: 4px; margin-bottom: 10px; }
.stab       { padding: 5px 14px; border-radius: 6px; font-size: 0.8rem; background: var(--surface2); border: 1.5px solid var(--border); cursor: pointer; color: var(--muted); transition: all 0.15s; user-select: none; }
.stab.active { background: var(--accent2); border-color: var(--accent2); color: #fff; }

/* ── Dot + custom amounts ── */
.p-dot          { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.custom-amounts { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 6px; }
.camount        { display: flex; align-items: center; gap: 6px; font-size: 0.82rem; }
.camount input  { width: 80px; }

/* ── Action button ── */
.btn       { background: var(--accent); color: #fff; border: none; border-radius: 8px; padding: 9px 18px; font-weight: 700; font-family: 'Noto Sans TC', sans-serif; cursor: pointer; font-size: 0.9rem; transition: opacity 0.2s; white-space: nowrap; }
.btn:hover { opacity: 0.85; }

/* ── Expense list ── */
.expense-item          { display: flex; align-items: center; gap: 10px; padding: 11px 0; border-bottom: 1px solid var(--border); }
.expense-item:last-child { border-bottom: none; }
.exp-name              { flex: 1; }
.exp-name .ename       { font-size: 0.92rem; font-weight: 500; }
.exp-name .emeta       { font-size: 0.76rem; color: var(--muted); margin-top: 2px; }
.exp-amt               { font-family: 'Space Mono', monospace; font-weight: 700; font-size: 0.95rem; color: var(--accent); text-align: right; }
.exp-amt .curr         { font-size: 0.7rem; font-weight: 400; color: var(--muted); }
.exp-del               { background: none; border: none; color: var(--border); cursor: pointer; font-size: 1rem; min-width: 44px; min-height: 44px; padding: 0 10px; display: inline-flex; align-items: center; justify-content: center; }
.exp-del:hover         { color: var(--danger); }
.empty                 { color: var(--muted); font-size: 0.85rem; text-align: center; padding: 18px 0; }

/* ── Result ── */
.member-summary          { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; margin-bottom: 16px; }
.msummary-card           { background: var(--surface2); border: 1.5px solid var(--border); border-radius: 10px; padding: 12px; }
.msummary-card .mname    { display: flex; align-items: center; gap: 6px; font-size: 0.82rem; font-weight: 700; margin-bottom: 8px; }
.msummary-card .mrow     { display: flex; justify-content: space-between; font-size: 0.78rem; color: var(--muted); margin-bottom: 3px; }
.msummary-card .mval     { font-family: 'Space Mono', monospace; color: var(--text); }
.msummary-card .mbalance { margin-top: 8px; padding-top: 8px; border-top: 1px solid var(--border); font-family: 'Space Mono', monospace; font-size: 0.9rem; font-weight: 700; text-align: right; }
.pos  { color: var(--green); }
.neg  { color: var(--danger); }
.zero { color: var(--muted); }

.settle-item  { display: flex; align-items: center; gap: 8px; background: var(--surface2); border: 1.5px solid var(--border); border-radius: 8px; padding: 11px 14px; margin-bottom: 8px; font-size: 0.88rem; }
.settle-arrow { font-family: 'Space Mono', monospace; color: var(--muted); }
.settle-amt   { margin-left: auto; font-family: 'Space Mono', monospace; font-weight: 700; color: var(--accent2); }

.divider    { border: none; border-top: 1px solid var(--border); margin: 14px 0; }
.total-line { display: flex; justify-content: space-between; align-items: center; font-size: 0.82rem; color: var(--muted); margin-bottom: 14px; }
.total-line span:last-child { font-family: 'Space Mono', monospace; color: var(--text); font-size: 0.9rem; }

/* ── Responsive ── */
@media (max-width: 480px) {
  .member-summary { grid-template-columns: 1fr; }
  .form-row { flex-direction: column; }
  .form-field { width: 100%; }
  #expAmt { width: 100% !important; }
  .card > .btn { width: 100%; padding: 12px; }
  .split-tabs { gap: 6px; }
  .stab { flex: 1; text-align: center; padding: 8px 6px; }
  /* iOS auto-zoom fix: font-size < 16px triggers viewport zoom on focus */
  input[type="text"], input[type="number"], select { font-size: 1rem; }
}

/* ── Toast ── */
#toast-container {
  position: fixed;
  bottom: max(24px, calc(16px + env(safe-area-inset-bottom)));
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column-reverse;
  gap: 8px;
  z-index: 9999;
  pointer-events: none;
  width: max-content;
  max-width: calc(100vw - 32px);
}
.toast {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 0.88rem;
  font-family: 'Noto Sans TC', sans-serif;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
  animation: toast-in 0.2s ease;
  pointer-events: auto;
}
.toast--success { border-color: var(--green); }
.toast--success .toast-dot { background: var(--green); }
.toast--error   { border-color: var(--danger); }
.toast--error   .toast-dot { background: var(--danger); }
.toast--info    { border-color: var(--accent2); }
.toast--info    .toast-dot { background: var(--accent2); }
.toast-dot {
  width: 7px; height: 7px;
  border-radius: 50%; flex-shrink: 0;
  background: var(--muted);
}
.toast.out { animation: toast-out 0.2s ease forwards; }
@keyframes toast-in  { from { opacity: 0; transform: translateY(8px) } to { opacity: 1; transform: translateY(0) } }
@keyframes toast-out { from { opacity: 1; transform: translateY(0) } to { opacity: 0; transform: translateY(8px) } }