:root {
  --paper: #f7f3e9;
  --ink: #17362f;
  --muted: #68756e;
  --line: #d7d8cb;
  --coral: #ef6a53;
  --yellow: #f4c95d;
  --white: #fffdf8;
  --green-soft: #dfeadf;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--paper);
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; background: var(--paper); }
html { scroll-behavior: smooth; }
button, input, select { font: inherit; }
button { cursor: pointer; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.hero { border-bottom: 1px solid var(--line); background: radial-gradient(circle at 80% 18%, rgba(244,201,93,.72) 0 6%, transparent 6.5%), linear-gradient(125deg, #e4eee3 0 58%, #f7f3e9 58%); }
.hero__inner { max-width: 1120px; margin: auto; padding: 62px 24px 46px; }
.eyebrow { margin: 0 0 16px; font-size: .76rem; letter-spacing: .18em; font-weight: 800; }
h1 { margin: 0; max-width: 680px; font-family: Georgia, "Songti SC", serif; font-weight: 500; font-size: clamp(3.2rem, 8vw, 6.8rem); line-height: .9; letter-spacing: -.055em; }
h1 em { color: var(--coral); font-weight: 500; }
.intro { max-width: 470px; margin: 28px 0; color: var(--muted); font-size: 1.05rem; line-height: 1.75; }
.pricing-link { display: inline-flex; align-items: center; min-height: 42px; margin: -10px 0 24px; padding: 0 16px; border-radius: 999px; color: white; background: var(--ink); font-size: .84rem; font-weight: 750; text-decoration: none; }
.pricing-hero { border-bottom: 1px solid var(--line); background: linear-gradient(135deg, #e4eee3 0 68%, #f7f3e9 68%); }
.pricing-hero__inner { max-width: 1120px; margin: auto; padding: 42px 24px 36px; }
.pricing-hero h1 { font-size: clamp(3rem, 7vw, 5.5rem); }
.back-link { display: inline-flex; margin-bottom: 30px; color: var(--ink); font-size: .84rem; font-weight: 750; text-decoration: none; }
.pricing-layout { max-width: 1120px; margin: 0 auto; padding: 26px 24px 72px; }
.hero__stats { display: flex; flex-wrap: wrap; gap: 10px; }
.hero__stats span { padding: 10px 14px; background: rgba(255,253,248,.76); border: 1px solid var(--line); border-radius: 999px; font-size: .86rem; }
.hero__stats b { margin-right: 3px; }

.layout { max-width: 1120px; margin: 0 auto; padding: 26px 24px 72px; display: grid; grid-template-columns: .85fr 1.15fr; gap: 18px; }
.panel { border: 1px solid var(--line); border-radius: 18px; padding: 24px; background: rgba(255,253,248,.68); box-shadow: 0 12px 40px rgba(23,54,47,.04); }
.panel--settlement { background: var(--ink); color: var(--white); }
.section-heading { display: flex; gap: 13px; align-items: flex-start; margin-bottom: 22px; }
.section-heading > span { display: grid; place-items: center; width: 34px; height: 34px; flex: none; border-radius: 50%; background: var(--yellow); color: var(--ink); font-size: .78rem; font-weight: 800; }
.section-heading h2 { margin: 0; font-family: Georgia, "Songti SC", serif; font-weight: 500; font-size: 1.65rem; }
.section-heading p { margin: 5px 0 0; color: var(--muted); font-size: .86rem; }
.panel--settlement .section-heading p { color: #aebdb7; }

.inline-form { display: flex; gap: 8px; }
input, select { width: 100%; min-height: 46px; padding: 10px 12px; color: var(--ink); background: var(--white); border: 1px solid var(--line); border-radius: 10px; outline: none; }
input:focus, select:focus { border-color: var(--coral); box-shadow: 0 0 0 3px rgba(239,106,83,.13); }
.button { min-height: 46px; border: 0; border-radius: 10px; padding: 0 18px; font-weight: 750; }
.button--dark { flex: none; color: white; background: var(--ink); }
.button--accent { width: 100%; color: white; background: var(--coral); }
.button:hover { filter: brightness(.96); transform: translateY(-1px); }

.people-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.person-chip { display: inline-flex; align-items: center; gap: 7px; padding: 8px 9px 8px 13px; border-radius: 999px; background: var(--green-soft); font-size: .88rem; }
.person-chip button { width: 23px; height: 23px; padding: 0; border: 0; border-radius: 50%; color: var(--muted); background: rgba(255,255,255,.6); }

.expense-form { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.expense-form label { display: grid; gap: 7px; font-size: .82rem; font-weight: 700; }
.expense-form label:first-child { grid-column: 1 / -1; }
fieldset { grid-column: 1 / -1; position: relative; margin: 0; padding: 13px; border: 1px solid var(--line); border-radius: 12px; }
legend { padding: 0 5px; font-size: .82rem; font-weight: 700; }
.check-actions { position: absolute; right: 10px; top: -28px; display: flex; gap: 4px; }
.check-actions button { border: 0; background: none; color: var(--coral); font-size: .76rem; }
.participant-checks { display: flex; flex-wrap: wrap; gap: 8px; }
.participant-checks label { display: flex; grid: none; align-items: center; gap: 7px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: white; font-weight: 500; }
.participant-checks input { width: 16px; min-height: auto; accent-color: var(--coral); }
.receipt-field { grid-column: 1 / -1; }
.upload-control { position: relative; display: grid; place-items: center; min-height: 58px; padding: 10px 14px; border: 1px dashed #afb6ac; border-radius: 10px; color: var(--muted); background: rgba(255,255,255,.55); font-weight: 600; text-align: center; overflow: hidden; }
.upload-control input { position: absolute; inset: 0; width: 100%; height: 100%; min-height: 0; opacity: 0; cursor: pointer; }
.upload-control:hover { border-color: var(--coral); color: var(--coral); }
.receipt-preview { grid-column: 1 / -1; align-items: center; gap: 12px; padding: 10px; border-radius: 12px; background: var(--green-soft); }
.receipt-preview:not([hidden]) { display: flex; }
.receipt-preview img { width: 72px; height: 72px; object-fit: cover; border-radius: 9px; background: white; }
.receipt-preview button { padding: 7px 10px; border: 0; border-radius: 7px; color: var(--coral); background: white; }
.expense-form .button, .form-hint { grid-column: 1 / -1; }
.form-hint { min-height: 1.1em; margin: -3px 0 0; color: var(--coral); font-size: .8rem; }

.empty { padding: 22px; text-align: center; border: 1px dashed var(--line); border-radius: 12px; color: var(--muted); font-size: .88rem; }
.expense-list { display: grid; gap: 9px; }
.expense-item { display: grid; grid-template-columns: auto 1fr auto auto; gap: 12px; align-items: center; padding: 12px; border-bottom: 1px solid var(--line); }
.expense-icon { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 10px; background: var(--yellow); font-size: 1.05rem; }
.expense-item h3 { margin: 0; font-size: .94rem; }
.expense-item p { margin: 4px 0 0; color: var(--muted); font-size: .75rem; line-height: 1.4; }
.receipt-thumb { display: inline-flex; align-items: center; gap: 7px; margin-top: 7px; padding: 0; border: 0; color: var(--coral); background: none; font-size: .74rem; font-weight: 700; text-decoration: none; }
.receipt-thumb img { display: block; width: 46px; height: 46px; object-fit: cover; border: 1px solid var(--line); border-radius: 7px; }
.amount { font-family: Georgia, serif; font-size: 1.15rem; font-weight: 700; }
.delete { width: 29px; height: 29px; padding: 0; border: 0; border-radius: 50%; color: var(--muted); background: transparent; }
.delete:hover { color: var(--coral); background: #f6e3df; }

.balances { display: grid; gap: 6px; margin-bottom: 26px; }
.balance-row { display: grid; grid-template-columns: 1fr auto; gap: 8px; padding: 9px 0; border-bottom: 1px solid rgba(255,255,255,.13); }
.balance-row small { display: block; margin-top: 3px; color: #aebdb7; }
.positive { color: #8ad0a8; }
.negative { color: #ff9e8e; }
.settlement-label { margin-bottom: 10px; color: var(--yellow); font-size: .75rem; font-weight: 800; letter-spacing: .12em; }
.transfers { display: grid; gap: 9px; }
.transfer { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 10px; padding: 13px; border: 1px solid rgba(255,255,255,.13); border-radius: 12px; background: rgba(255,255,255,.06); }
.transfer span:last-child { text-align: right; }
.transfer b { color: var(--yellow); white-space: nowrap; font-size: .92rem; }
.panel--settlement .empty { color: #aebdb7; border-color: rgba(255,255,255,.2); }
.settlement-actions { display: flex; align-items: center; gap: 16px; margin-top: 24px; }
.export-button { display: inline-flex; align-items: center; min-height: 42px; padding: 0 15px; border: 0; border-radius: 9px; color: var(--ink); background: var(--yellow); font-weight: 800; text-decoration: none; }
.export-button[aria-disabled="true"] { cursor: not-allowed; opacity: .45; }
.reset-button { padding: 0; border: 0; color: #aebdb7; background: none; text-decoration: underline; text-underline-offset: 4px; }
.panel--pricing { grid-column: 1 / -1; }
.pricing-intro { margin-bottom: 18px; padding: 16px 18px; border-radius: 14px; background: var(--green-soft); }
.pricing-intro p { margin: 5px 0 0; color: var(--muted); font-size: .84rem; }
.price-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; align-items: stretch; }
.price-card { position: relative; display: flex; flex-direction: column; min-width: 0; padding: 18px 15px; border: 1px solid var(--line); border-radius: 15px; background: var(--white); }
.price-card--featured { border: 2px solid var(--coral); box-shadow: 0 10px 26px rgba(239,106,83,.12); }
.recommended { position: absolute; top: -11px; right: 12px; padding: 4px 9px; border-radius: 999px; color: white; background: var(--coral); font-size: .68rem; font-weight: 800; }
.price-card__name { margin: 0 0 12px; font-weight: 800; }
.price { display: flex; align-items: baseline; gap: 5px; margin: 0 0 15px; }
.price b { font-family: Georgia, serif; font-size: 1.85rem; }
.price span { color: var(--muted); font-size: .72rem; }
.price-card ul { flex: 1; margin: 0 0 18px; padding-left: 18px; color: var(--muted); font-size: .78rem; line-height: 1.8; }
.price-button { display: inline-flex; align-items: center; justify-content: center; width: 100%; min-height: 42px; border: 0; border-radius: 9px; color: white; background: var(--ink); font-weight: 750; text-decoration: none; }
.price-card--featured .price-button { background: var(--coral); }
.price-button--current { color: var(--muted); background: #ecece5; cursor: default; }
.pricing-note { margin: 16px 0 0; color: var(--muted); font-size: .75rem; line-height: 1.6; }
.payment-dialog { width: min(430px, calc(100% - 30px)); padding: 30px; border: 0; border-radius: 20px; color: var(--ink); background: var(--white); box-shadow: 0 24px 70px rgba(23,54,47,.28); text-align: center; }
.payment-dialog::backdrop { background: rgba(23,54,47,.62); backdrop-filter: blur(4px); }
.payment-dialog h2 { margin: 13px 0 8px; font-family: Georgia, "Songti SC", serif; font-size: 1.7rem; }
.payment-dialog p { margin: 0; }
.dialog-icon { display: grid; place-items: center; width: 52px; height: 52px; margin: auto; border-radius: 50%; color: var(--ink); background: var(--yellow); font: 700 1.35rem Georgia, serif; }
.dialog-close { position: absolute; top: 10px; right: 12px; width: 34px; height: 34px; padding: 0; border: 0; border-radius: 50%; color: var(--muted); background: #f1eee6; font-size: 1.3rem; }
#selectedPlan { color: var(--coral); font-weight: 800; }
.dialog-detail { margin-top: 13px !important; color: var(--muted); font-size: .82rem; line-height: 1.65; }
.dialog-pricing-link { display: inline-flex; align-items: center; min-height: 42px; margin-top: 18px; padding: 0 16px; border-radius: 9px; color: white; background: var(--ink); font-weight: 750; text-decoration: none; }
.receipt-dialog { width: min(940px, calc(100% - 24px)); height: min(90vh, 820px); padding: 0; border: 0; border-radius: 18px; color: white; background: #102520; box-shadow: 0 26px 80px rgba(0,0,0,.45); overflow: hidden; }
.receipt-dialog[open] { display: grid; grid-template-rows: auto minmax(0, 1fr) auto; }
.receipt-dialog::backdrop { background: rgba(7,18,15,.84); backdrop-filter: blur(5px); }
.receipt-dialog__header { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 13px 16px; border-bottom: 1px solid rgba(255,255,255,.12); }
.receipt-dialog__header h2 { margin: 0; font-size: .95rem; }
.receipt-dialog__header button { width: 38px; height: 38px; padding: 0; border: 0; border-radius: 50%; color: white; background: rgba(255,255,255,.12); font-size: 1.45rem; }
.receipt-dialog__canvas { min-height: 0; overflow: auto; display: grid; place-items: center; padding: 18px; }
.receipt-dialog__canvas img { max-width: 100%; max-height: 100%; transform-origin: center; transition: transform .16s ease; box-shadow: 0 5px 26px rgba(0,0,0,.28); }
.receipt-dialog__tools { display: flex; justify-content: center; gap: 10px; padding: 12px 16px max(12px, env(safe-area-inset-bottom)); border-top: 1px solid rgba(255,255,255,.12); }
.receipt-dialog__tools button { min-width: 48px; min-height: 42px; padding: 0 14px; border: 0; border-radius: 9px; color: var(--ink); background: var(--yellow); font-weight: 800; }
footer { padding: 22px; border-top: 1px solid var(--line); text-align: center; color: var(--muted); font-size: .78rem; }
.mobile-nav { display: none; }

@media (max-width: 760px) {
  body { padding-bottom: calc(70px + env(safe-area-inset-bottom)); }
  .hero { background: radial-gradient(circle at 89% 16%, rgba(244,201,93,.9) 0 7%, transparent 7.5%), linear-gradient(145deg, #e4eee3 0 73%, #f7f3e9 73%); }
  .hero__inner { padding: 30px 18px 24px; }
  .eyebrow { margin-bottom: 12px; font-size: .66rem; }
  h1 { max-width: 330px; font-size: clamp(2.75rem, 14vw, 4rem); line-height: .92; }
  .intro { margin: 17px 0 18px; font-size: .9rem; line-height: 1.55; }
  .pricing-link { min-height: 40px; margin: -4px 0 18px; }
  .pricing-hero__inner { padding: 26px 18px 24px; }
  .pricing-hero h1 { font-size: clamp(2.6rem, 13vw, 4rem); }
  .back-link { margin-bottom: 22px; }
  .pricing-layout { padding: 12px 10px 34px; }
  .hero__stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 7px; }
  .hero__stats span { display: grid; gap: 2px; padding: 9px 6px; border-radius: 12px; text-align: center; font-size: .68rem; }
  .hero__stats b { display: block; margin: 0; font-size: .98rem; }
  .layout { grid-template-columns: 1fr; gap: 12px; padding: 12px 10px 24px; }
  .panel { scroll-margin-top: 10px; padding: 18px 16px; border-radius: 20px; box-shadow: 0 7px 24px rgba(23,54,47,.045); }
  .section-heading { gap: 10px; margin-bottom: 17px; }
  .section-heading > span { width: 31px; height: 31px; font-size: .7rem; }
  .section-heading h2 { font-size: 1.45rem; }
  .section-heading p { margin-top: 3px; font-size: .78rem; }
  input, select { min-height: 50px; border-radius: 12px; font-size: 16px; }
  .button { min-height: 50px; border-radius: 12px; }
  .inline-form { gap: 7px; }
  .inline-form .button { padding-inline: 17px; }
  .person-chip { min-height: 38px; padding-left: 14px; }
  .expense-form { grid-template-columns: 1fr; gap: 13px; }
  .expense-form label:first-child, .receipt-field, .receipt-preview, fieldset, .expense-form .button, .form-hint { grid-column: 1; }
  .expense-form label { font-size: .8rem; }
  .upload-control { min-height: 54px; }
  fieldset { padding: 13px 11px; border-radius: 13px; }
  .participant-checks { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 7px; }
  .participant-checks label { min-height: 43px; justify-content: center; border-radius: 10px; }
  .button--accent { min-height: 54px; font-size: 1rem; }
  .expense-list { gap: 9px; }
  .expense-item { grid-template-columns: 36px minmax(0, 1fr) auto; gap: 10px; padding: 13px 11px; border: 1px solid var(--line); border-radius: 14px; background: rgba(255,255,255,.48); }
  .expense-icon { width: 36px; height: 36px; }
  .expense-item h3 { font-size: .98rem; }
  .expense-item p { font-size: .72rem; }
  .expense-item .amount { grid-column: 2; font-size: 1.1rem; color: var(--coral); }
  .expense-item .delete { grid-row: 1 / 3; grid-column: 3; align-self: start; background: #f3eee5; }
  .receipt-thumb img { width: 42px; height: 42px; }
  .receipt-dialog { width: 100%; height: 100dvh; max-height: none; border-radius: 0; }
  .receipt-dialog__canvas { padding: 12px; }
  .balance-row { gap: 10px; padding: 11px 0; font-size: .9rem; }
  .balance-row small { font-size: .7rem; }
  .transfer { grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); padding: 12px 10px; font-size: .86rem; }
  .settlement-actions { align-items: stretch; flex-direction: column; gap: 12px; }
  .export-button { justify-content: center; min-height: 48px; }
  .reset-button { min-height: 38px; }
  .panel--pricing { grid-column: 1; }
  .price-grid { grid-template-columns: 1fr; gap: 11px; }
  .price-card { padding: 18px; }
  .price-card ul { margin-bottom: 14px; }
  .payment-dialog { padding: 28px 20px 22px; }
  footer { padding: 18px 16px 8px; border-top: 0; }
  .mobile-nav { position: fixed; z-index: 20; right: 8px; bottom: max(8px, env(safe-area-inset-bottom)); left: 8px; display: grid; grid-template-columns: repeat(5, 1fr); padding: 6px; border: 1px solid rgba(255,255,255,.12); border-radius: 17px; background: rgba(23,54,47,.94); box-shadow: 0 10px 34px rgba(23,54,47,.28); backdrop-filter: blur(14px); }
  .mobile-nav a { display: grid; place-items: center; gap: 2px; min-height: 47px; border-radius: 12px; color: #dce7e1; font-size: .67rem; text-decoration: none; }
  .mobile-nav a:active { color: var(--ink); background: var(--yellow); }
  .mobile-nav span { color: var(--yellow); font-size: .58rem; font-weight: 800; letter-spacing: .08em; }
  .mobile-nav a:active span { color: var(--ink); }
}

@media (max-width: 430px) {
  .hero__stats span { padding-inline: 3px; }
  .panel { padding-inline: 14px; }
}