/* ==========================================================================
   SPLITSO — Design tokens
   Palette: warm paper ground, deep emerald primary (trust/money),
   coral accent for action, gold for currency/premium touches.
   Type: Space Grotesk (display) / Inter (body) / IBM Plex Mono (amounts,
   receipt-ticker feel — the signature motif of this product).
   ========================================================================== */

:root {
  /* ---- color: light ---- */
  --paper: #FAFAF8;
  --paper-raised: #FFFFFF;
  --paper-sunken: #F2F0E7;
  --ink: #1B2430;
  --ink-soft: #5B6472;
  --ink-faint: #A2A9B3;
  --line: #E6E2D6;
  --line-strong: #D8D3C3;

  --primary: #0F6B5C;
  --primary-strong: #0B5147;
  --primary-soft: #E3F1ED;
  --on-primary: #FBFBF8;

  --accent: #FF6A46;
  --accent-strong: #E5502D;
  --accent-soft: #FFE9E1;
  --on-accent: #FFFFFF;

  --gold: #C8912E;
  --gold-soft: #FBF0DA;

  --danger: #D8453A;
  --danger-soft: #FBE7E5;
  --success: #1E8E63;

  --brand-mark-bg: var(--primary);
  --brand-mark-fg: #FBFBF8;

  /* ---- type ---- */
  --font-display: "Space Grotesk", "Inter", sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  /* ---- geometry ---- */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 999px;

  --shadow-sm: 0 1px 2px rgba(27, 36, 48, 0.06), 0 1px 1px rgba(27, 36, 48, 0.04);
  --shadow-md: 0 8px 24px -8px rgba(27, 36, 48, 0.16), 0 2px 8px -2px rgba(27, 36, 48, 0.08);
  --shadow-lg: 0 24px 60px -16px rgba(27, 36, 48, 0.28), 0 8px 20px -8px rgba(27, 36, 48, 0.12);

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast: 140ms;
  --dur-base: 220ms;
  --dur-slow: 420ms;

  color-scheme: light;
}

[data-theme="dark"] {
  --paper: #10151A;
  --paper-raised: #171E26;
  --paper-sunken: #0B0F13;
  --ink: #EDEFF3;
  --ink-soft: #9CA6B2;
  --ink-faint: #5A6570;
  --line: #262E37;
  --line-strong: #333D48;

  --primary: #3BBFA1;
  --primary-strong: #57D4B6;
  --primary-soft: rgba(59, 191, 161, 0.14);
  --on-primary: #08110F;

  --accent: #FF8567;
  --accent-strong: #FF9C82;
  --accent-soft: rgba(255, 133, 103, 0.15);
  --on-accent: #1B0D08;

  --gold: #E8BE64;
  --gold-soft: rgba(232, 190, 100, 0.13);

  --danger: #FF7A6E;
  --danger-soft: rgba(255, 122, 110, 0.14);
  --success: #45C98F;

  --brand-mark-bg: var(--primary);
  --brand-mark-fg: #08110F;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px -8px rgba(0, 0, 0, 0.5), 0 2px 8px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 24px 60px -16px rgba(0, 0, 0, 0.6), 0 8px 20px -8px rgba(0, 0, 0, 0.35);

  color-scheme: dark;
}

/* ==========================================================================
   Reset
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background var(--dur-base) var(--ease-out), color var(--dur-base) var(--ease-out);
}
h1, h2, h3, h4 { margin: 0; font-family: var(--font-display); }
p { margin: 0; }
ul { list-style: none; margin: 0; padding: 0; }
button { font: inherit; color: inherit; }
input, select { font: inherit; color: inherit; }
button, [role="button"] { cursor: pointer; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; }

::selection { background: var(--accent-soft); color: var(--accent-strong); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

.skip-link {
  position: fixed;
  top: -60px;
  left: 12px;
  z-index: 999;
  background: var(--ink);
  color: var(--paper);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  transition: top var(--dur-fast) var(--ease-out);
}
.skip-link:focus { top: 12px; }

/* ==========================================================================
   App bar
   ========================================================================== */

.appbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(14px) saturate(1.4);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  border-bottom: 1px solid var(--line);
}
.appbar__inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  color: var(--ink);
}
.brand__mark {
  display: grid;
  place-items: center;
}
.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -0.01em;
}
.appbar__actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.icon-btn {
  position: relative;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: var(--paper-raised);
  color: var(--ink-soft);
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-spring), background var(--dur-fast) var(--ease-out);
}
.icon-btn:hover { color: var(--ink); border-color: var(--line-strong); transform: translateY(-1px); }
.icon-btn:active { transform: translateY(0) scale(0.94); }

.icon--off, .icon--moon { display: none; }
[data-sound="off"] .icon--on { display: none; }
[data-sound="off"] .icon--off { display: block; }
[data-theme="dark"] .icon--sun { display: none; }
[data-theme="dark"] .icon--moon { display: block; }

.lang-label { font-family: var(--font-mono); font-size: 12px; font-weight: 600; letter-spacing: 0.03em; }

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  padding: 11px 20px;
  font-weight: 600;
  font-size: 13.5px;
  white-space: nowrap;
  transition: transform var(--dur-fast) var(--ease-spring), box-shadow var(--dur-base) var(--ease-out), background var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.btn:active { transform: scale(0.97); }
.btn--sm { padding: 8px 14px; font-size: 12.5px; }

.btn--primary {
  background: linear-gradient(155deg, var(--primary) 0%, var(--primary-strong) 100%);
  color: var(--on-primary);
  box-shadow: 0 6px 16px -6px color-mix(in srgb, var(--primary) 60%, transparent);
}
.btn--primary:hover { box-shadow: 0 10px 22px -8px color-mix(in srgb, var(--primary) 65%, transparent); transform: translateY(-1px); }

.btn--ghost {
  background: var(--paper-raised);
  border-color: var(--line);
  color: var(--ink);
}
.btn--ghost:hover { border-color: var(--line-strong); background: var(--paper-sunken); }

.btn--text {
  background: transparent;
  color: var(--ink-soft);
  padding: 6px 8px;
}
.btn--text:hover { color: var(--danger); }

/* ==========================================================================
   Hero
   ========================================================================== */

.hero { padding: 56px 24px 8px; text-align: center; }
.hero__inner { max-width: 700px; margin: 0 auto; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 14px;
}
.hero__title {
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.08;
  letter-spacing: -0.025em;
  font-weight: 700;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.hero__title-accent { color: var(--accent); }
.hero__subtitle {
  margin: 18px auto 0;
  max-width: 520px;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.55;
}

/* ==========================================================================
   Presets
   ========================================================================== */

.presets { padding: 26px 24px 4px; }
.presets__row {
  max-width: 1180px;
  margin: 0 auto;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 4px 2px 10px;
  scrollbar-width: none;
}
.presets__row::-webkit-scrollbar { display: none; }

.preset-btn {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: var(--paper-raised);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-soft);
  transition: all var(--dur-fast) var(--ease-out);
}
.preset-btn:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-1px); }
.preset-btn.is-active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--on-primary);
  box-shadow: 0 6px 16px -8px color-mix(in srgb, var(--primary) 60%, transparent);
}
.preset-btn__icon { display: grid; place-items: center; opacity: 0.9; }

/* ==========================================================================
   Workspace grid
   ========================================================================== */

.workspace {
  max-width: 1180px;
  margin: 0 auto;
  padding: 20px 24px 80px;
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 24px;
  align-items: start;
}

.panel--inputs { display: flex; flex-direction: column; gap: 18px; min-width: 0; }
.panel--summary {
  position: sticky;
  top: 84px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ==========================================================================
   Cards
   ========================================================================== */

.card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 22px 22px 24px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
  animation: card-in var(--dur-slow) var(--ease-out) both;
}
.card:hover { box-shadow: var(--shadow-md); border-color: var(--line-strong); }

@keyframes card-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
.workspace .card:nth-of-type(1) { animation-delay: 0ms; }
.workspace .card:nth-of-type(2) { animation-delay: 40ms; }
.workspace .card:nth-of-type(3) { animation-delay: 80ms; }
.workspace .card:nth-of-type(4) { animation-delay: 120ms; }
.workspace .card:nth-of-type(5) { animation-delay: 160ms; }

.card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 18px;
}
.card__title { font-size: 16.5px; font-weight: 600; letter-spacing: -0.01em; }
.step-index {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.05em;
}

/* ==========================================================================
   Fields / inputs
   ========================================================================== */

.field-row { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; }
.field { display: flex; flex-direction: column; gap: 7px; min-width: 130px; }
.field--grow { flex: 1 1 220px; }
.field__label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink-soft);
}
.field__error {
  font-size: 12px;
  color: var(--danger);
  min-height: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: all var(--dur-base) var(--ease-out);
}
.field__error.is-visible { max-height: 30px; opacity: 1; margin-top: 2px; }

.amount-input {
  display: flex;
  align-items: center;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--paper);
  padding: 0 4px 0 14px;
  transition: border-color var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}
.amount-input:focus-within { border-color: var(--primary); box-shadow: 0 0 0 4px var(--primary-soft); }
.amount-input.has-error { border-color: var(--danger); }
.amount-input.has-error:focus-within { box-shadow: 0 0 0 4px var(--danger-soft); }
.amount-input__currency {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink-faint);
  padding-right: 10px;
  border-right: 1px solid var(--line);
}
.amount-input__field {
  flex: 1;
  border: none;
  background: transparent;
  outline: none;
  padding: 13px 12px;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  min-width: 0;
}
.amount-input__field::placeholder { color: var(--ink-faint); font-weight: 500; }

.select {
  appearance: none;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--paper) url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none"><path d="M6 9l6 6 6-6" stroke="%235B6472" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/></svg>') no-repeat right 12px center;
  padding: 12.5px 34px 12.5px 14px;
  font-size: 13.5px;
  font-weight: 500;
  min-width: 168px;
  transition: border-color var(--dur-fast) var(--ease-out);
}
[dir="rtl"] .select { background-position: left 12px center; padding: 12.5px 14px 12.5px 34px; }
.select:focus { border-color: var(--primary); }

.text-input {
  width: 100%;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--paper);
  padding: 12px 14px;
  font-size: 14px;
  outline: none;
  transition: border-color var(--dur-fast) var(--ease-out);
}
.text-input:focus { border-color: var(--primary); box-shadow: 0 0 0 4px var(--primary-soft); }

/* ==========================================================================
   Chips (radio-style)
   ========================================================================== */

.subfield { margin-top: 20px; }
.subfield:first-child { margin-top: 0; }
.subfield__label-row { margin-bottom: 10px; }
.subfield__label { font-size: 12.5px; font-weight: 600; color: var(--ink-soft); }

.chip-group { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  border: 1.5px solid var(--line);
  background: var(--paper);
  color: var(--ink-soft);
  padding: 9px 15px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 600;
  transition: all var(--dur-fast) var(--ease-out);
}
.chip:hover { border-color: var(--primary); color: var(--primary); }
.chip.is-active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--on-primary);
  box-shadow: 0 4px 12px -4px color-mix(in srgb, var(--primary) 55%, transparent);
}
.chip:active { transform: scale(0.96); }

.inline-custom {
  margin-top: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-md);
  padding: 4px 4px 4px 14px;
  max-width: 220px;
  animation: expand-in var(--dur-base) var(--ease-out) both;
}
.inline-custom__input {
  flex: 1;
  border: none;
  background: transparent;
  outline: none;
  padding: 9px 4px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 14px;
  min-width: 0;
}
.inline-custom__suffix {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-faint);
  padding-right: 10px;
}

@keyframes expand-in {
  from { opacity: 0; transform: translateY(-4px) scaleY(0.9); }
  to { opacity: 1; transform: translateY(0) scaleY(1); }
}

.collapse {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows var(--dur-base) var(--ease-out), opacity var(--dur-base) var(--ease-out);
}
.collapse > * { overflow: hidden; }
.collapse.is-open { grid-template-rows: 1fr; opacity: 1; margin-top: 10px; }

/* ==========================================================================
   Switch (toggle)
   ========================================================================== */

.switch { display: inline-flex; align-items: center; gap: 10px; cursor: pointer; }
.switch input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.switch__track {
  width: 40px;
  height: 24px;
  border-radius: var(--radius-pill);
  background: var(--line-strong);
  position: relative;
  transition: background var(--dur-base) var(--ease-out);
  flex-shrink: 0;
}
.switch__thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur-base) var(--ease-spring);
}
.switch input:checked + .switch__track { background: var(--primary); }
.switch input:checked + .switch__track .switch__thumb { transform: translateX(16px); }
[dir="rtl"] .switch input:checked + .switch__track .switch__thumb { transform: translateX(-16px); }
.switch input:focus-visible + .switch__track { outline: 2px solid var(--accent); outline-offset: 2px; }
.switch__label { font-size: 13.5px; font-weight: 600; color: var(--ink); }

/* ==========================================================================
   Segmented control / pills
   ========================================================================== */

.segmented {
  display: flex;
  gap: 4px;
  background: var(--paper-sunken);
  padding: 4px;
  border-radius: var(--radius-pill);
  margin-bottom: 18px;
}
.segmented__btn {
  flex: 1;
  border: none;
  background: transparent;
  padding: 10px 12px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-soft);
  transition: all var(--dur-fast) var(--ease-out);
}
.segmented__btn.is-active {
  background: var(--paper-raised);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.split-mode-row { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; margin-bottom: 14px; }
.pill-group { display: flex; gap: 6px; flex-wrap: wrap; }
.pill {
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink-soft);
  padding: 7px 13px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 600;
  transition: all var(--dur-fast) var(--ease-out);
}
.pill.is-active { background: var(--accent-soft); border-color: var(--accent); color: var(--accent-strong); }

/* ==========================================================================
   Stepper
   ========================================================================== */

.stepper {
  display: inline-flex;
  align-items: center;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.stepper__btn {
  width: 44px;
  height: 46px;
  border: none;
  background: var(--paper-sunken);
  font-size: 19px;
  font-weight: 600;
  color: var(--ink);
  transition: background var(--dur-fast) var(--ease-out);
}
.stepper__btn:hover { background: var(--primary-soft); color: var(--primary); }
.stepper__btn:active { transform: scale(0.95); }
.stepper__value {
  width: 64px;
  text-align: center;
  border: none;
  border-inline: 1.5px solid var(--line);
  height: 46px;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  outline: none;
  background: var(--paper-raised);
}

/* ==========================================================================
   Friends list
   ========================================================================== */

.friends { margin-top: 22px; }
.friends__head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.friends__list { display: flex; flex-direction: column; gap: 8px; }

.friend-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--paper);
  animation: friend-in var(--dur-base) var(--ease-spring) both;
}
@keyframes friend-in {
  from { opacity: 0; transform: translateX(-8px) scale(0.98); }
  to { opacity: 1; transform: translateX(0) scale(1); }
}
[dir="rtl"] .friend-row { animation-name: friend-in-rtl; }
@keyframes friend-in-rtl {
  from { opacity: 0; transform: translateX(8px) scale(0.98); }
  to { opacity: 1; transform: translateX(0) scale(1); }
}
.friend-row.is-removing { animation: friend-out var(--dur-fast) var(--ease-out) forwards; }
@keyframes friend-out {
  to { opacity: 0; transform: scale(0.9); height: 0; margin: 0; padding: 0; border-width: 0; }
}

.friend-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13px;
  color: #fff;
  flex-shrink: 0;
}
.friend-name {
  border: none;
  background: transparent;
  outline: none;
  font-size: 13.5px;
  font-weight: 600;
  flex: 1;
  min-width: 0;
  padding: 6px 2px;
  border-bottom: 1.5px solid transparent;
  transition: border-color var(--dur-fast) var(--ease-out);
}
.friend-name:focus { border-color: var(--primary); }

.friend-input {
  border: none;
  background: var(--paper-sunken);
  border-radius: 8px;
  outline: none;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  width: 76px;
  padding: 8px 8px;
  text-align: center;
  flex-shrink: 0;
}
.friend-input:focus { box-shadow: 0 0 0 3px var(--primary-soft); }
.friend-suffix { font-size: 11.5px; color: var(--ink-faint); font-family: var(--font-mono); }

.friend-remove {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--ink-faint);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  transition: all var(--dur-fast) var(--ease-out);
}
.friend-remove:hover { background: var(--danger-soft); color: var(--danger); }

.split-warning {
  margin-top: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 13px;
  border-radius: var(--radius-md);
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 12.5px;
  font-weight: 600;
  animation: shake 0.4s var(--ease-out);
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-3px); }
  75% { transform: translateX(3px); }
}

/* ==========================================================================
   Receipt (signature element)
   ========================================================================== */

.receipt-wrap { position: relative; filter: drop-shadow(var(--shadow-lg)); }
.receipt {
  background: var(--paper-raised);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  padding: 28px 24px 22px;
  position: relative;
  background-image:
    repeating-linear-gradient(transparent, transparent 27px, color-mix(in srgb, var(--line) 55%, transparent) 28px);
}
.receipt__header { text-align: center; margin-bottom: 18px; }
.receipt__brand {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.3em;
  font-size: 12px;
  color: var(--ink-soft);
}
.receipt__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  margin-top: 5px;
}

.receipt__empty {
  padding: 30px 10px 12px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: var(--ink-faint);
}
.receipt__empty svg { opacity: 0.7; }
.receipt__empty p { font-weight: 600; font-size: 14px; color: var(--ink-soft); }
.receipt__empty-sub { font-weight: 400 !important; font-size: 12.5px !important; color: var(--ink-faint) !important; max-width: 220px; }

.receipt__body { animation: receipt-print var(--dur-slow) var(--ease-out) both; }
@keyframes receipt-print {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.receipt__rows { display: flex; flex-direction: column; gap: 10px; }
.receipt__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  font-size: 13px;
  gap: 12px;
}
.receipt__row > span:first-child { color: var(--ink-soft); }
.receipt__amount {
  font-family: var(--font-mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  white-space: nowrap;
}
.receipt__row--muted .receipt__amount { color: var(--ink-faint); }

.receipt__divider {
  border: none;
  border-top: 1.5px dashed var(--line-strong);
  margin: 16px 0;
}
.receipt__divider--dashed { border-top-style: dotted; }

.receipt__row--total {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
}
.receipt__row--total .receipt__amount {
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--primary);
}

.receipt__perhead { margin-top: 16px; display: flex; flex-direction: column; gap: 8px; }
.perhead-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border-radius: 10px;
  background: var(--paper-sunken);
  animation: perhead-in var(--dur-base) var(--ease-spring) both;
}
@keyframes perhead-in { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }
.perhead-avatar { width: 24px; height: 24px; border-radius: 50%; flex-shrink: 0; display: grid; place-items: center; font-size: 10px; font-weight: 700; color: #fff; font-family: var(--font-display); }
.perhead-name { font-size: 12.5px; font-weight: 600; flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.perhead-amount { font-family: var(--font-mono); font-weight: 700; font-size: 13px; font-variant-numeric: tabular-nums; }
.perhead-diff { font-family: var(--font-mono); font-size: 10.5px; color: var(--ink-faint); }

/* Perforated tear edge — signature detail */
.receipt__teeth {
  height: 14px;
  background:
    radial-gradient(circle at 10px 0, transparent 7px, var(--paper-raised) 7.5px) top / 20px 14px repeat-x,
    var(--paper);
  border-radius: 0 0 4px 4px;
}
[data-theme="dark"] .receipt__teeth {
  background:
    radial-gradient(circle at 10px 0, transparent 7px, var(--paper-raised) 7.5px) top / 20px 14px repeat-x,
    var(--paper);
}

.summary-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.summary-actions .btn--primary { grid-column: 1 / -1; }
.summary-actions.is-visible { animation: expand-in var(--dur-base) var(--ease-out) both; }

/* number tick animation helper */
.tick { animation: tick-pop 260ms var(--ease-spring); }
@keyframes tick-pop { 0% { transform: scale(1); } 40% { transform: scale(1.06); } 100% { transform: scale(1); } }

/* ==========================================================================
   Drawer (history)
   ========================================================================== */

.drawer-overlay {
  position: fixed; inset: 0;
  background: rgba(15, 20, 26, 0.44);
  backdrop-filter: blur(2px);
  z-index: 60;
  opacity: 0;
  animation: fade-in var(--dur-base) var(--ease-out) forwards;
}
@keyframes fade-in { to { opacity: 1; } }

.drawer {
  position: fixed;
  top: 0; right: 0;
  height: 100%;
  width: min(400px, 92vw);
  background: var(--paper-raised);
  border-left: 1px solid var(--line);
  z-index: 61;
  transform: translateX(100%);
  transition: transform var(--dur-slow) var(--ease-out);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: 22px;
  box-shadow: var(--shadow-lg);
}
[dir="rtl"] .drawer { right: auto; left: 0; border-left: none; border-right: 1px solid var(--line); transform: translateX(-100%); }
.drawer.is-open { transform: translateX(0); }

.drawer__head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.drawer__head h2 { font-size: 19px; }
.drawer__section { margin-bottom: 26px; }
.drawer__section-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.drawer__section-head h3 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-faint); font-family: var(--font-mono); font-weight: 600; }
.drawer__empty { font-size: 12.5px; color: var(--ink-faint); padding: 10px 2px; }

.fav-groups { display: flex; flex-wrap: wrap; gap: 8px; }
.fav-group-chip {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--line); border-radius: var(--radius-pill);
  padding: 8px 8px 8px 14px; font-size: 12.5px; font-weight: 600;
  background: var(--paper);
}
.fav-group-chip button { display: grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; color: var(--ink-faint); }
.fav-group-chip button:hover { background: var(--danger-soft); color: var(--danger); }

.history-list { display: flex; flex-direction: column; gap: 10px; }
.history-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 13px 14px;
  transition: border-color var(--dur-fast) var(--ease-out);
}
.history-item:hover { border-color: var(--line-strong); }
.history-item__top { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 6px; }
.history-item__date { font-family: var(--font-mono); font-size: 11px; color: var(--ink-faint); }
.history-item__total { font-family: var(--font-mono); font-weight: 700; font-size: 15px; color: var(--primary); }
.history-item__meta { font-size: 12px; color: var(--ink-soft); margin-bottom: 10px; }
.history-item__actions { display: flex; gap: 8px; }
.history-item__actions button {
  font-size: 11.5px; font-weight: 600; padding: 6px 11px; border-radius: var(--radius-pill);
  border: 1px solid var(--line); background: var(--paper);
}
.history-item__actions button:hover { border-color: var(--primary); color: var(--primary); }
.history-item__actions .is-danger:hover { border-color: var(--danger); color: var(--danger); }

/* ==========================================================================
   Toasts
   ========================================================================== */

.toast-stack {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  width: min(360px, 92vw);
}
.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--ink);
  color: var(--paper);
  padding: 12px 18px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  animation: toast-in var(--dur-base) var(--ease-spring) both;
}
[data-theme="dark"] .toast { background: var(--paper-raised); border: 1px solid var(--line-strong); color: var(--ink); }
.toast.is-leaving { animation: toast-out var(--dur-fast) var(--ease-out) forwards; }
@keyframes toast-in { from { opacity: 0; transform: translateY(14px) scale(0.94); } to { opacity: 1; transform: translateY(0) scale(1); } }
@keyframes toast-out { to { opacity: 0; transform: translateY(8px) scale(0.94); } }
.toast--success::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--success); flex-shrink: 0; }
.toast--error::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--danger); flex-shrink: 0; }

/* ==========================================================================
   Modal
   ========================================================================== */

.modal-overlay { position: fixed; inset: 0; background: rgba(15,20,26,0.44); z-index: 70; animation: fade-in var(--dur-base) var(--ease-out) forwards; opacity: 0; }
.modal {
  position: fixed;
  top: 50%; left: 50%;
  transform: translate(-50%, -46%);
  width: min(340px, 90vw);
  background: var(--paper-raised);
  border-radius: var(--radius-lg);
  padding: 22px;
  z-index: 71;
  box-shadow: var(--shadow-lg);
  animation: modal-in var(--dur-base) var(--ease-spring) both;
}
@keyframes modal-in { from { opacity: 0; transform: translate(-50%, -42%) scale(0.94); } to { opacity: 1; transform: translate(-50%, -46%) scale(1); } }
.modal h3 { font-size: 16px; margin-bottom: 14px; }
.modal__actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 16px; }

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer { border-top: 1px solid var(--line); padding: 28px 24px 40px; }
.site-footer__inner { max-width: 1180px; margin: 0 auto; display: flex; flex-wrap: wrap; gap: 6px 20px; justify-content: space-between; font-size: 12px; color: var(--ink-faint); }
.site-footer__brand { font-weight: 700; color: var(--ink-soft); font-family: var(--font-display); }
.site-footer__version { font-family: var(--font-mono); }

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 980px) {
  .workspace { grid-template-columns: 1fr; }
  .panel--summary { position: static; order: -1; }
  .receipt-wrap { max-width: 460px; margin: 0 auto; }
}

@media (max-width: 640px) {
  .appbar__inner { padding: 12px 16px; }
  .hero { padding: 40px 16px 4px; }
  .hero__subtitle { font-size: 14.5px; }
  .presets { padding: 20px 16px 4px; }
  .workspace { padding: 16px 16px 90px; gap: 16px; }
  .card { padding: 18px 16px 20px; border-radius: var(--radius-md); }
  .field-row { flex-direction: column; align-items: stretch; }
  .select { min-width: 0; width: 100%; }
  .summary-actions { grid-template-columns: 1fr 1fr; }
  .drawer { width: 100vw; }
}

/* ==========================================================================
   Print styles (receipt)
   ========================================================================== */

@media print {
  body * { visibility: hidden; }
  .receipt, .receipt * { visibility: visible; }
  .receipt { position: fixed; top: 0; left: 0; width: 100%; box-shadow: none; border-radius: 0; }
  .receipt__teeth { display: none; }
}