:root {
  color-scheme: light dark;
  --bg: #f7efe4;
  --ink: #17211f;
  --muted: #66736f;
  --panel: rgba(255, 252, 246, .84);
  --panel-strong: rgba(255, 252, 246, .96);
  --line: rgba(36, 48, 45, .14);
  --primary: #1f5d54;
  --primary-dark: #153f3a;
  --primary-2: #d66f4d;
  --gold: #f4be4f;
  --sky: #7aa7a1;
  --shadow: 0 18px 48px rgba(30, 37, 33, .10);
  --radius: 8px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121816;
    --ink: #f3efe6;
    --muted: #aab7b2;
    --panel: rgba(31, 41, 38, .86);
    --panel-strong: rgba(35, 46, 43, .96);
    --line: rgba(238, 234, 221, .14);
    --shadow: 0 18px 48px rgba(0, 0, 0, .28);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 12% 0%, rgba(244, 190, 79, .16), transparent 31rem),
    radial-gradient(circle at 85% 8%, rgba(122, 167, 161, .18), transparent 28rem),
    linear-gradient(135deg, rgba(31, 93, 84, .10), transparent 36rem),
    var(--bg);
  color: var(--ink);
  font: 16px/1.5 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button, input, select, textarea { font: inherit; }

a { color: inherit; }

body:not(.authenticated) .app-shell,
body:not(.authenticated) .mobile-nav {
  display: none;
}

body.authenticated .login-screen {
  display: none;
}

.login-screen {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.login-card {
  width: min(27rem, 100%);
  display: grid;
  gap: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-strong);
  box-shadow: var(--shadow);
  padding: clamp(1.1rem, 4vw, 1.7rem);
}

.login-card img {
  width: 4rem;
  height: 4rem;
  border-radius: var(--radius);
}

.login-card h1 {
  font-size: clamp(2rem, 8vw, 3.1rem);
}

.login-users {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .6rem;
}

.user-choice {
  min-height: 3.3rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .32);
  color: var(--ink);
}

.user-choice.active {
  border-color: rgba(31, 93, 84, .36);
  background: rgba(31, 93, 84, .14);
  color: var(--primary);
}

.app-shell {
  display: grid;
  grid-template-columns: 17rem minmax(0, 1fr);
  min-height: 100vh;
}

.rail {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 1.25rem;
  border-right: 1px solid var(--line);
  background: rgba(255, 255, 255, .22);
  backdrop-filter: blur(20px);
}

.brand {
  display: flex;
  align-items: center;
  gap: .75rem;
  text-decoration: none;
  font-weight: 800;
}

.brand img { width: 2.6rem; height: 2.6rem; border-radius: 8px; }

.nav {
  display: grid;
  gap: .35rem;
  margin-top: 2rem;
}

.nav a {
  display: flex;
  align-items: center;
  min-height: 2.75rem;
  border-radius: var(--radius);
  color: var(--muted);
  padding: .72rem .85rem;
  text-decoration: none;
  transition: background .18s ease, color .18s ease, transform .18s ease;
}

.nav a:hover, .nav a.active {
  background: var(--panel);
  color: var(--ink);
  transform: translateX(2px);
}

.main {
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: 1.5rem clamp(1rem, 3vw, 2rem) 6rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.4rem;
}

.eyebrow {
  margin: 0 0 .15rem;
  color: var(--primary-2);
  font-size: .8rem;
  font-weight: 800;
  text-transform: uppercase;
}

h1, h2 { margin: 0; line-height: 1.1; letter-spacing: 0; }
h1 { font-size: clamp(2rem, 5vw, 4rem); }
h2 { font-size: 1.1rem; }

.home-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1.2rem;
  align-items: end;
  margin-bottom: 1rem;
  border: 1px solid rgba(31, 93, 84, .22);
  border-radius: var(--radius);
  padding: clamp(1.15rem, 3vw, 1.75rem);
  background:
    linear-gradient(135deg, rgba(31, 93, 84, .95), rgba(28, 73, 67, .9)),
    var(--primary);
  color: #fff8eb;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.home-card strong {
  display: block;
  max-width: 48rem;
  margin: .25rem 0 .4rem;
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: .98;
}

.home-card span {
  color: rgba(255, 248, 235, .75);
  font-weight: 750;
}

.home-card .eyebrow {
  color: var(--gold);
}

.quick-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: .65rem;
}

.view {
  display: none;
  animation: rise .22s ease both;
}

.view.active { display: block; }

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

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .9rem;
}

.metric, .panel, .settlement-hero {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-strong);
  box-shadow: var(--shadow);
}

.metric {
  display: grid;
  gap: .4rem;
  min-height: 7.6rem;
  padding: 1rem;
}

.metric span, .settlement-hero span, .panel-head a, small {
  color: var(--muted);
  font-size: .86rem;
}

.metric strong {
  align-self: end;
  font-size: clamp(1.3rem, 2vw, 1.9rem);
  line-height: 1.05;
}

.split-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(20rem, .75fr);
  gap: 1rem;
  margin-top: 1rem;
}

.panel { padding: 1rem; }

.form-panel {
  padding: clamp(1rem, 2.5vw, 1.35rem);
}

.form-intro {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.form-intro p {
  max-width: 42rem;
  margin: .4rem 0 0;
  color: var(--muted);
}

.conversion-preview {
  min-width: 8.5rem;
  border: 1px solid rgba(31, 93, 84, .20);
  border-radius: var(--radius);
  padding: .75rem .9rem;
  background: rgba(31, 93, 84, .10);
  color: var(--primary);
  font-size: 1.15rem;
  font-weight: 900;
  text-align: right;
  white-space: nowrap;
}

.preset-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: .55rem;
  margin-bottom: 1rem;
}

.preset-chip {
  min-height: 2.55rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .30);
  color: var(--ink);
  padding: .55rem .7rem;
}

.preset-chip.active {
  border-color: rgba(31, 93, 84, .36);
  background: rgba(31, 93, 84, .12);
  color: var(--primary);
}

.split-presets {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .5rem;
  grid-column: 1 / -1;
}

.share-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .75rem;
  grid-column: 1 / -1;
}

.tag-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
}

.tag-button, .tag-pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(31, 93, 84, .08);
  color: var(--primary);
  font-size: .78rem;
  font-weight: 800;
}

.tag-button {
  min-height: 2.1rem;
  padding: .35rem .65rem;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  margin-top: .45rem;
}

.tag-pill {
  display: inline-flex;
  padding: .12rem .52rem;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: .85rem;
}

.expense-stack {
  display: grid;
  gap: .75rem;
}

.expense-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: .85rem;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: .85rem;
  background: linear-gradient(180deg, rgba(255, 255, 255, .38), rgba(255, 255, 255, .18));
  animation: rise .18s ease both;
  transition: border-color .16s ease, transform .16s ease, box-shadow .16s ease;
}

.expense-card:hover {
  border-color: rgba(31, 93, 84, .25);
  transform: translateY(-1px);
  box-shadow: 0 10px 28px rgba(30, 37, 33, .08);
}

.expense-title {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  align-items: center;
  font-weight: 800;
}

.pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .12rem .5rem;
  color: var(--muted);
  font-size: .74rem;
  font-weight: 700;
}

.expense-meta {
  color: var(--muted);
  font-size: .88rem;
}

.expense-note {
  margin-top: .35rem;
  color: var(--muted);
  font-size: .86rem;
}

.amount {
  text-align: right;
  font-weight: 900;
  white-space: nowrap;
}

.card-actions {
  display: flex;
  justify-content: flex-end;
  gap: .4rem;
  margin-top: .5rem;
}

.form { margin: 0; }

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .85rem;
}

label, fieldset {
  display: grid;
  gap: .35rem;
  margin: 0;
  color: var(--muted);
  font-size: .85rem;
  font-weight: 700;
}

fieldset {
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: .75rem;
}

.split-control {
  grid-column: span 2;
}

legend { padding: 0 .25rem; }

.check {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  min-height: 2.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .22);
  color: var(--ink);
  font-weight: 700;
}

.check input {
  width: auto;
  accent-color: var(--primary);
}

input, select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .50);
  color: var(--ink);
  padding: .78rem .82rem;
  outline: none;
}

textarea { resize: vertical; }

input:focus, select:focus, textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(31, 93, 84, .16);
}

.span-2 { grid-column: 1 / -1; }

.form-actions, .toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1rem;
}

.toolbar {
  margin-top: 0;
  margin-bottom: 1rem;
}

.toolbar input { flex: 2 1 18rem; }
.toolbar select { flex: 1 1 12rem; }

button, .button-link, .import-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  border: 0;
  border-radius: var(--radius);
  padding: .76rem 1rem;
  cursor: pointer;
  font-weight: 850;
  text-decoration: none;
  transition: transform .16s ease, filter .16s ease;
}

button:hover, .button-link:hover, .import-label:hover { transform: translateY(-1px); }
button:active, .button-link:active, .import-label:active { transform: translateY(0); }

.primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 10px 24px rgba(31, 93, 84, .20);
}

.primary:hover {
  filter: brightness(.98);
}

.soft {
  border: 1px solid rgba(255, 255, 255, .28);
  background: rgba(255, 255, 255, .14);
  color: #fff8eb;
  backdrop-filter: blur(10px);
}

.ghost {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .24);
  color: var(--ink);
}

.top-action {
  min-width: 9rem;
}

.icon-button {
  width: 2.25rem;
  min-height: 2.25rem;
  padding: 0;
}

.import-label input { display: none; }

.category-bars, .breakdown {
  display: grid;
  gap: .7rem;
}

.bar-row, .break-row {
  display: grid;
  gap: .35rem;
}

.bar-label, .break-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.bar-track {
  height: .6rem;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(127, 133, 129, .22);
}

.bar-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--primary), var(--primary-2), var(--gold));
}

.settlement-hero {
  display: grid;
  gap: .5rem;
  padding: clamp(1.2rem, 4vw, 2rem);
}

.settlement-hero strong {
  font-size: clamp(2rem, 7vw, 4.8rem);
  line-height: .98;
}

.empty {
  display: grid;
  gap: .75rem;
  justify-items: start;
  color: var(--muted);
  padding: 1.1rem;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .16);
}

.empty strong {
  color: var(--ink);
  font-size: 1rem;
}

.empty .button-link {
  min-height: 2.4rem;
  padding: .58rem .8rem;
}

.mobile-nav {
  display: none;
}

.toast {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 20;
  max-width: min(24rem, calc(100vw - 2rem));
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--bg);
  padding: .8rem 1rem;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(1rem);
  pointer-events: none;
  transition: opacity .18s ease, transform .18s ease;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 920px) {
  .app-shell { grid-template-columns: 1fr; }
  .rail {
    position: sticky;
    z-index: 10;
    height: auto;
    padding: .75rem;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .brand span { display: none; }
  .rail, .nav { display: flex; align-items: center; gap: .4rem; overflow-x: auto; }
  .nav { margin-top: 0; }
  .nav a { white-space: nowrap; padding: .62rem .7rem; }
  .main { padding-top: 1rem; }
  .metric-grid, .split-layout { grid-template-columns: 1fr 1fr; }
  .home-card { grid-template-columns: 1fr; }
  .quick-actions { justify-content: flex-start; }
  .preset-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  html { scroll-padding-bottom: 6.5rem; }
  body { font-size: 15px; }
  .rail { display: none; }
  .topbar { align-items: stretch; flex-direction: column; margin-bottom: .9rem; }
  .top-action { display: none; }
  .metric-grid, .split-layout, .form-grid { grid-template-columns: 1fr; }
  .metric { min-height: 6.8rem; }
  .expense-card { grid-template-columns: 1fr; }
  .amount { text-align: left; }
  fieldset { grid-template-columns: 1fr; }
  .split-control { grid-column: auto; }
  .span-2 { grid-column: auto; }
  .form-actions > *, .toolbar > * { flex: 1 1 100%; }
  .form-intro { display: grid; }
  .conversion-preview { width: 100%; text-align: left; }
  .preset-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .quick-actions > * { flex: 1 1 calc(50% - .65rem); }
  .main { padding-bottom: 6.5rem; }
  .form-panel { margin-bottom: 1.5rem; }
  .form-actions { margin-bottom: 1rem; }
  .mobile-nav {
    position: fixed;
    left: .75rem;
    right: .75rem;
    bottom: .75rem;
    z-index: 15;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: .2rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: .35rem;
    background: var(--panel-strong);
    box-shadow: var(--shadow);
    backdrop-filter: blur(20px);
  }
  .mobile-nav a {
    display: grid;
    place-items: center;
    min-height: 2.65rem;
    border-radius: 7px;
    color: var(--muted);
    font-size: .78rem;
    font-weight: 850;
    text-decoration: none;
  }
  .mobile-nav a.active {
    background: rgba(31, 93, 84, .12);
    color: var(--primary);
  }
}