/* ============ Tip · Style ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-1: #1e1b4b;
  --bg-2: #2a2466;
  --bg-3: #3730a3;
  --periwinkle:   #818cf8;
  --periwinkle-2: #a5b4fc;
  --periwinkle-3: #c7d2fe;
  --indigo-deep:  #312e81;
  --cream:        #fef9c3;
  --green:        #22c55e;
  --red:          #ef4444;
  --text:         #eef2ff;
  --muted:        rgba(238,242,255,.55);
  --faint:        rgba(238,242,255,.32);
  --safe-top: env(safe-area-inset-top, 0);
  --safe-bot: env(safe-area-inset-bottom, 0);
}

html, body {
  background: var(--bg-1);
  color: var(--text);
  font-family: 'Heebo', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  overscroll-behavior: none;
  -webkit-tap-highlight-color: transparent;
}
body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  padding-top: calc(58px + var(--safe-top));
  padding-bottom: calc(28px + var(--safe-bot));
}

.ambient-bg {
  position: fixed;
  inset: 0;
  z-index: -3;
  overflow: hidden;
  background: var(--bg-1);
}
.orb-blur {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: .35;
  pointer-events: none;
  will-change: transform;
}
.orb-blur.o1 {
  width: 60vmax; height: 60vmax;
  background: radial-gradient(circle, var(--periwinkle) 0%, transparent 60%);
  top: -20vh; right: -10vw;
  animation: drift1 28s ease-in-out infinite;
}
.orb-blur.o2 {
  width: 55vmax; height: 55vmax;
  background: radial-gradient(circle, var(--indigo-deep) 0%, transparent 60%);
  bottom: -20vh; left: -10vw;
  animation: drift2 32s ease-in-out infinite;
  opacity: .55;
}
@keyframes drift1 { 0%,100%{transform:translate(0,0)scale(1);} 50%{transform:translate(-7vw,5vh)scale(1.05);} }
@keyframes drift2 { 0%,100%{transform:translate(0,0)scale(1);} 50%{transform:translate(7vw,-5vh)scale(.96);} }

/* Top bar */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: calc(58px + var(--safe-top));
  padding-top: var(--safe-top);
  padding-inline: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(30,27,75,.78);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  border-bottom: 1px solid rgba(165,180,252,.16);
  z-index: 100;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand .mark {
  width: 30px; height: 30px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--periwinkle), var(--periwinkle-2));
  display: grid; place-items: center;
  color: var(--bg-1);
  box-shadow: 0 6px 18px rgba(129,140,248,.55);
}
.brand .mark svg { width: 17px; height: 17px; }
.brand span:not(.mark) {
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.02em;
}
.header-actions { display: flex; gap: 8px; }
.icon-btn {
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid rgba(165,180,252,.20);
  background: rgba(165,180,252,.06);
  color: var(--text);
  cursor: pointer;
  display: grid; place-items: center;
  font-size: 16px;
  transition: background .2s, transform .15s;
}
.icon-btn:hover { background: rgba(165,180,252,.14); }
.icon-btn:active { transform: scale(.92); }
.install-btn {
  background: linear-gradient(135deg, var(--periwinkle), var(--periwinkle-2));
  color: var(--bg-1);
  border: none;
  padding: 8px 16px;
  border-radius: 999px;
  font-family: inherit;
  font-weight: 700;
  font-size: 12px;
  cursor: pointer;
  box-shadow: 0 6px 16px rgba(129,140,248,.5);
}
.hidden { display: none !important; }

main { padding: 16px 18px; max-width: 480px; margin: 0 auto; }

/* ============ Bill input card ============ */
.bill-card {
  background: rgba(165,180,252,.06);
  border: 1px solid rgba(165,180,252,.18);
  border-radius: 22px;
  padding: 22px 24px;
  margin-bottom: 14px;
  position: relative;
  overflow: hidden;
}
.bill-card::before {
  content: '';
  position: absolute;
  top: -40px; left: -40px;
  width: 160px; height: 160px;
  background: radial-gradient(circle, rgba(129,140,248,.20), transparent 60%);
  pointer-events: none;
}
.bill-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 10px;
  position: relative;
}
.bill-input-wrap {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px;
  position: relative;
}
.currency-symbol {
  font-size: 36px;
  font-weight: 300;
  color: var(--periwinkle-2);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
.bill-input {
  background: transparent;
  border: none;
  color: var(--text);
  font-family: inherit;
  font-size: 48px;
  font-weight: 200;
  letter-spacing: -0.03em;
  outline: none;
  font-variant-numeric: tabular-nums;
  width: 100%;
  text-align: right;
  direction: ltr;
  padding: 0;
}
.bill-input::placeholder { color: var(--faint); }
.bill-input:focus { outline: none; }
.bill-input::-webkit-outer-spin-button,
.bill-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.bill-input[type=number] { -moz-appearance: textfield; }

.currency-btn {
  width: 40px; height: 40px;
  border-radius: 12px;
  border: 1px solid rgba(165,180,252,.18);
  background: rgba(165,180,252,.06);
  color: var(--periwinkle-2);
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  flex-shrink: 0;
}
.currency-btn:hover { background: rgba(165,180,252,.14); }

/* ============ Tip card ============ */
.tip-card, .people-card {
  background: rgba(165,180,252,.05);
  border: 1px solid rgba(165,180,252,.14);
  border-radius: 18px;
  padding: 16px 18px;
  margin-bottom: 12px;
}
.tip-header, .people-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.tip-label, .people-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--muted);
  text-transform: uppercase;
}
.tip-value {
  font-size: 22px;
  font-weight: 700;
  color: var(--periwinkle-2);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.tip-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, rgba(129,140,248,.18), rgba(165,180,252,.55));
  border-radius: 3px;
  outline: none;
  margin-bottom: 12px;
}
.tip-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px; height: 22px;
  background: linear-gradient(135deg, var(--periwinkle), var(--periwinkle-2));
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(129,140,248,.6);
}
.tip-slider::-moz-range-thumb {
  width: 22px; height: 22px;
  background: linear-gradient(135deg, var(--periwinkle), var(--periwinkle-2));
  border-radius: 50%;
  cursor: pointer;
  border: 0;
}
.tip-quickset {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
}
.tip-chip {
  padding: 8px 2px;
  background: rgba(165,180,252,.05);
  border: 1px solid rgba(165,180,252,.12);
  border-radius: 999px;
  color: var(--muted);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
}
.tip-chip:hover { background: rgba(165,180,252,.10); color: var(--text); }
.tip-chip.active {
  background: rgba(129,140,248,.18);
  border-color: rgba(129,140,248,.5);
  color: var(--periwinkle-2);
}

/* ============ People card ============ */
.people-counter {
  display: flex;
  align-items: center;
  gap: 8px;
}
.ppl-btn {
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 1px solid rgba(165,180,252,.20);
  background: rgba(165,180,252,.06);
  color: var(--text);
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  display: grid; place-items: center;
}
.ppl-btn:hover { background: rgba(165,180,252,.14); }
.ppl-btn:active { transform: scale(.92); }
.ppl-count {
  font-size: 22px;
  font-weight: 700;
  color: var(--periwinkle-2);
  font-variant-numeric: tabular-nums;
  min-width: 24px;
  text-align: center;
}
.ppl-suffix {
  font-size: 12px;
  color: var(--muted);
  margin-inline-start: 4px;
}
.people-quickset {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 4px;
}
.ppl-chip {
  padding: 8px 2px;
  background: rgba(165,180,252,.05);
  border: 1px solid rgba(165,180,252,.12);
  border-radius: 8px;
  color: var(--muted);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  font-variant-numeric: tabular-nums;
}
.ppl-chip:hover { background: rgba(165,180,252,.10); color: var(--text); }
.ppl-chip.active {
  background: rgba(129,140,248,.18);
  border-color: rgba(129,140,248,.5);
  color: var(--periwinkle-2);
}

/* ============ Summary card ============ */
.summary-card {
  background: linear-gradient(135deg, rgba(129,140,248,.20), rgba(165,180,252,.10));
  border: 1px solid rgba(129,140,248,.40);
  border-radius: 22px;
  padding: 22px 24px;
  margin-bottom: 16px;
  position: relative;
  overflow: hidden;
}
.summary-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 20%, rgba(199,210,254,.20), transparent 60%);
  pointer-events: none;
}
.summary-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 14px;
  position: relative;
}
.summary-row .s-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--periwinkle-3);
  text-transform: uppercase;
}
.summary-row .s-value.big {
  font-size: 56px;
  font-weight: 200;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--text);
  text-shadow: 0 4px 24px rgba(129,140,248,.45);
  direction: ltr;
}
.summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
  position: relative;
}
.s-cell {
  background: rgba(30,27,75,.4);
  border: 1px solid rgba(165,180,252,.14);
  border-radius: 12px;
  padding: 10px 8px;
  text-align: center;
}
.s-cell-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 9px;
  letter-spacing: 1.5px;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 4px;
}
.s-cell-val {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  direction: ltr;
}

/* ============ Action buttons ============ */
.actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 12px;
}
.btn-primary {
  width: 100%;
  padding: 16px;
  background: linear-gradient(135deg, var(--periwinkle), var(--periwinkle-2));
  color: var(--bg-1);
  border: none;
  border-radius: 14px;
  font-family: inherit;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  box-shadow: 0 14px 30px -8px rgba(129,140,248,.55);
  transition: transform .15s;
}
.btn-primary:active { transform: scale(.97); }
.btn-primary:disabled { opacity: .35; cursor: not-allowed; }
.btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.btn-mini {
  padding: 12px;
  background: rgba(165,180,252,.06);
  border: 1px solid rgba(165,180,252,.18);
  color: var(--text);
  font-family: inherit;
  font-weight: 600;
  font-size: 13px;
  border-radius: 12px;
  cursor: pointer;
  transition: background .2s;
}
.btn-mini:hover { background: rgba(165,180,252,.12); }
.btn-mini:disabled { opacity: .35; cursor: not-allowed; }
.btn-secondary {
  padding: 12px;
  background: rgba(165,180,252,.06);
  border: 1px solid rgba(165,180,252,.18);
  color: var(--text);
  font-family: inherit;
  font-weight: 600;
  font-size: 14px;
  border-radius: 12px;
  cursor: pointer;
}
.btn-secondary:hover { background: rgba(165,180,252,.12); }

/* ============ Modal ============ */
.modal {
  position: fixed; inset: 0;
  background: rgba(30,27,75,.78);
  backdrop-filter: blur(8px);
  z-index: 200;
  display: grid;
  place-items: end center;
  animation: modal-in .25s ease;
}
@keyframes modal-in { from{opacity:0;} to{opacity:1;} }
.modal-card {
  background: rgba(42,36,102,.95);
  backdrop-filter: blur(18px) saturate(160%);
  border: 1px solid rgba(165,180,252,.20);
  border-top-left-radius: 28px;
  border-top-right-radius: 28px;
  padding: 24px 22px calc(28px + var(--safe-bot));
  width: 100%;
  max-width: 480px;
  animation: sheet-up .35s cubic-bezier(.2,.9,.3,1.05);
  max-height: 90vh;
  overflow-y: auto;
}
@keyframes sheet-up { from{transform:translateY(100%);} to{transform:translateY(0);} }
.modal-card .handle { width: 38px; height: 4px; background: rgba(165,180,252,.30); border-radius: 2px; margin: -8px auto 16px; }
.modal-card h3 { font-size: 20px; font-weight: 800; letter-spacing: -0.02em; margin-bottom: 6px; }
.modal-card p { color: var(--muted); font-size: 13px; margin-bottom: 18px; line-height: 1.7; }
.modal-card p strong { color: var(--periwinkle-2); }
.mark-big {
  width: 56px; height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--periwinkle), var(--periwinkle-2));
  margin: 0 auto 14px;
  display: grid; place-items: center;
  color: var(--bg-1);
  box-shadow: 0 10px 30px rgba(129,140,248,.55);
}
.mark-big svg { width: 28px; height: 28px; }

.modal-input {
  width: 100%;
  background: var(--bg-1);
  border: 1px solid rgba(165,180,252,.18);
  color: var(--text);
  padding: 12px 14px;
  border-radius: 12px;
  font-family: inherit;
  font-size: 15px;
  margin-bottom: 14px;
}
.modal-input:focus { outline: 2px solid var(--periwinkle); outline-offset: 2px; }

.modal-summary {
  background: rgba(165,180,252,.06);
  border-radius: 12px;
  padding: 14px;
  margin-bottom: 16px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
  text-align: center;
}
.modal-summary .stat-mini {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 16px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--periwinkle-2);
}
.modal-summary .stat-mini .k {
  display: block;
  font-size: 9px;
  letter-spacing: 1.5px;
  color: var(--faint);
  margin-top: 4px;
  font-weight: 500;
}
.modal-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }

/* Currency picker */
.currency-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 12px;
}
.currency-pick {
  background: rgba(165,180,252,.05);
  border: 1px solid rgba(165,180,252,.14);
  color: var(--text);
  padding: 16px 8px;
  border-radius: 14px;
  cursor: pointer;
  font-family: inherit;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  transition: all .2s;
}
.currency-pick:hover { background: rgba(165,180,252,.12); }
.currency-pick.active {
  background: rgba(129,140,248,.18);
  border-color: rgba(129,140,248,.5);
}
.currency-pick .big {
  font-size: 32px;
  font-weight: 300;
  color: var(--periwinkle-2);
  font-variant-numeric: tabular-nums;
}
.currency-pick span:not(.big) {
  font-size: 12px;
  color: var(--muted);
}

/* History list */
.history-list { max-height: 50vh; overflow-y: auto; }
.history-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 14px 16px;
  background: rgba(165,180,252,.05);
  border: 1px solid rgba(165,180,252,.12);
  border-radius: 12px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: all .2s;
}
.history-item:hover { background: rgba(165,180,252,.10); }
.history-item .h-info .name {
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 4px;
}
.history-item .h-info .meta {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  color: var(--muted);
}
.history-item .h-amount {
  text-align: left;
  direction: ltr;
}
.history-item .h-amount .big {
  font-size: 18px;
  font-weight: 700;
  color: var(--periwinkle-2);
  font-variant-numeric: tabular-nums;
}
.history-item .h-amount .small {
  font-size: 11px;
  color: var(--faint);
  font-family: 'IBM Plex Mono', monospace;
}
.history-item .h-del {
  background: transparent;
  border: 1px solid rgba(165,180,252,.18);
  color: var(--muted);
  padding: 5px 9px;
  border-radius: 8px;
  font-size: 11px;
  cursor: pointer;
  font-family: inherit;
}

.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--muted);
}
.empty-state .ico { font-size: 48px; margin-bottom: 14px; opacity: .55; }

/* Toast */
.toast {
  position: fixed;
  top: calc(70px + var(--safe-top));
  left: 50%;
  transform: translateX(-50%);
  background: rgba(42,36,102,.96);
  border: 1px solid rgba(165,180,252,.30);
  color: var(--text);
  padding: 10px 22px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  z-index: 300;
  box-shadow: 0 18px 40px rgba(0,0,0,.5);
  backdrop-filter: blur(10px);
  animation: toast-in .25s ease;
}
@keyframes toast-in { from{opacity:0; transform:translate(-50%, -16px);} to{opacity:1; transform:translate(-50%, 0);} }
.toast.success { color: var(--green); border-color: rgba(34,197,94,.5); }
.toast.error { color: var(--red); border-color: rgba(239,68,68,.5); }