:root {
  color-scheme: light;
  --paper: #eeeee8;
  --surface: #fbfaf6;
  --ink: #1d2220;
  --muted: #686f6a;
  --line: #d5d8d1;
  --accent: #a43c32;
  --accent-dark: #742b25;
  --accent-soft: #f1e1dc;
  --sage: #e2e6df;
  --shadow: 0 12px 30px rgb(24 30 27 / 8%);
  font-family: "Aptos", "Segoe UI", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

* { box-sizing: border-box; }

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background:
    linear-gradient(rgb(242 242 237 / 78%), rgb(242 242 237 / 84%)),
    url("assets/ink-paper.jpg") center / cover fixed,
    var(--paper);
  color: var(--ink);
}

button, input, select { font: inherit; }
button { color: inherit; }
[hidden] { display: none !important; }

.app-shell {
  width: min(100% - 56px, 1120px);
  margin: 0 auto;
  padding: 26px 0 22px;
}

.brand-row, .brand-lockup, .privacy-pill, .panel-heading, .field-label,
.result-actions, .page-footer, .mode-button { display: flex; align-items: center; }

.brand-row { justify-content: space-between; min-height: 42px; }
.brand-lockup { gap: 10px; }
.brand-lockup > span:last-child { display: grid; gap: 2px; }
.brand-lockup strong { font-size: 13px; letter-spacing: .04em; }
.brand-lockup small { color: var(--muted); font-size: 10px; letter-spacing: .04em; }
.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: 8px 8px 8px 2px;
  background: var(--ink);
  color: #faf7ef;
  font-family: Georgia, serif;
  font-size: 19px;
  font-weight: 700;
}
.privacy-pill {
  gap: 7px;
  padding: 8px 11px;
  border: 1px solid #ddded5;
  border-radius: 999px;
  background: rgb(255 254 250 / 60%);
  color: #60645d;
  font-size: 11px;
}
.privacy-pill span { width: 6px; height: 6px; border-radius: 50%; background: #6b8a69; }

.intro {
  position: relative;
  display: flex;
  min-height: 182px;
  align-items: center;
  justify-content: space-between;
  margin: 16px 0 18px;
  padding: 25px 38px;
  overflow: hidden;
  border: 1px solid rgb(36 39 36 / 22%);
  border-radius: 8px;
  background-color: #343a36;
  background-image: linear-gradient(90deg, rgb(15 18 16 / 48%) 0%, rgb(15 18 16 / 22%) 46%, transparent 76%), url("assets/ink-hero.jpg");
  background-position: center 58%;
  background-size: cover;
}
.intro::after { position: absolute; z-index: 1; inset: 0; background: linear-gradient(90deg, #1d2220 0%, rgb(29 34 32 / 94%) 38%, rgb(29 34 32 / 0%) 78%); content: ""; pointer-events: none; }
.intro-copy { position: relative; z-index: 2; max-width: 52%; }
.eyebrow, .section-kicker {
  margin: 0;
  color: #ed8172;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .16em;
}
.eyebrow { display: flex; align-items: center; gap: 9px; }
.eyebrow span { display: inline-block; width: 22px; height: 1px; background: #a76b5f; }
h1, h2, p { margin-top: 0; }
h1 {
  margin: 11px 0 7px;
  font-family: "Noto Serif SC", "Songti SC", "SimSun", serif;
  font-size: 43px;
  color: #fffdf7;
  font-weight: 650;
  letter-spacing: .045em;
  line-height: 1.1;
}
.intro-text { margin: 0; color: rgb(255 255 250 / 84%); font-size: 13px; text-shadow: 0 1px 8px rgb(0 0 0 / 20%); }
.intro-index { position: absolute; right: 28px; bottom: 18px; color: rgb(255 255 250 / 70%); font-size: 9px; letter-spacing: .12em; }

.mode-switch { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 14px; }
.mode-button {
  position: relative;
  min-width: 0;
  gap: 13px;
  min-height: 76px;
  padding: 14px 17px;
  border: 1px solid rgb(54 61 57 / 15%);
  border-radius: 8px;
  background-color: rgb(250 250 246 / 90%);
  background-image: linear-gradient(rgb(250 250 246 / 89%), rgb(250 250 246 / 89%)), url("assets/ink-paper.jpg");
  background-position: center;
  background-size: cover;
  text-align: left;
  cursor: pointer;
  transition: border-color .18s ease, background .18s ease, transform .18s ease;
}
.mode-button:hover { transform: translateY(-1px); border-color: #c7a69c; }
.mode-button:focus-visible, .copy-button:focus-visible, input:focus-visible, select:focus-visible { outline: 3px solid rgb(155 69 56 / 24%); outline-offset: 2px; }
.mode-button.is-active { border-color: var(--accent); background-color: #fffdfa; background-image: linear-gradient(rgb(255 253 250 / 90%), rgb(255 253 250 / 90%)), url("assets/ink-paper.jpg"); box-shadow: inset 0 0 0 1px var(--accent); }
.mode-number { display: grid; width: 34px; height: 34px; flex: 0 0 auto; place-items: center; border-radius: 6px; background: var(--sage); color: #565e53; font-family: "Segoe UI", sans-serif; font-size: 13px; font-variant-numeric: lining-nums tabular-nums; }
.mode-button.is-active .mode-number { background: var(--accent-soft); color: var(--accent-dark); }
.mode-button > span:nth-child(2) { display: grid; min-width: 0; gap: 4px; }
.mode-button strong { font-size: 14px; font-weight: 650; }
.mode-button small { overflow: hidden; color: var(--muted); font-size: 11px; text-overflow: ellipsis; white-space: nowrap; }
.mode-arrow { margin-left: auto; color: #88887f; font-size: 16px; }
.mode-button.is-active .mode-arrow { color: var(--accent); }

.workbench { display: grid; grid-template-columns: minmax(0, 1.03fr) minmax(0, .97fr); gap: 14px; align-items: stretch; }
.panel { min-width: 0; padding: 23px; border: 1px solid rgb(42 48 44 / 15%); border-radius: 8px; background-color: rgb(251 250 246 / 94%); background-image: linear-gradient(rgb(251 250 246 / 91%), rgb(251 250 246 / 91%)), url("assets/ink-paper.jpg"); background-position: center; background-size: cover; box-shadow: var(--shadow); }
.panel-heading { justify-content: space-between; margin-bottom: 22px; }
.panel-heading h2 { margin: 5px 0 0; font-family: "Noto Serif SC", "Songti SC", "SimSun", serif; font-size: 20px; font-weight: 650; letter-spacing: .025em; }
.section-kicker { color: #9b9184; font-size: 9px; }
.step-badge { padding: 6px 9px; border-radius: 8px; background: #f4f1e9; color: #76776f; font-size: 10px; }
.step-badge b { margin-left: 4px; color: var(--accent); font-family: "Segoe UI", sans-serif; font-size: 12px; font-variant-numeric: lining-nums tabular-nums; }
.calculator-mode { display: grid; gap: 15px; }
.field { display: grid; min-width: 0; gap: 7px; }
.field-label { justify-content: space-between; gap: 8px; color: #333631; font-size: 12px; font-weight: 600; }
.field-label > span { color: #96958c; font-size: 10px; font-weight: 400; }
.input-wrap { position: relative; display: block; }
input, select {
  display: block;
  width: 100%;
  min-width: 0;
  height: 45px;
  padding: 0 42px 0 13px;
  border: 1px solid #d8dbd4;
  border-radius: 6px;
  background: rgb(253 252 248 / 94%);
  color: var(--ink);
  font-size: 14px;
  font-variant-numeric: lining-nums tabular-nums;
  font-feature-settings: "lnum" 1, "tnum" 1;
  transition: border-color .15s ease, background .15s ease;
}
input:hover, select:hover { border-color: #c8bfb1; }
input:focus, select:focus { border-color: #a43c32; background: #fff; outline: none; }
input::placeholder { color: #b0aea4; }
input::-webkit-outer-spin-button, input::-webkit-inner-spin-button { margin: 0; -webkit-appearance: none; }
input[type=number] { -moz-appearance: textfield; }
select { padding-right: 36px; appearance: auto; }
.input-unit { position: absolute; top: 50%; right: 13px; color: #99968c; font-size: 10px; pointer-events: none; transform: translateY(-50%); }
.field-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 12px; }
.field-hint { margin: -1px 0 0; color: #77786f; font-size: 11px; line-height: 1.65; }
.input-status { min-height: 32px; margin-top: 18px; padding: 9px 11px; border-left: 2px solid #a43c32; border-radius: 2px; background: #eeefea; color: #58615c; font-size: 11px; line-height: 1.4; }
.input-status.is-error { background: #faeeeb; color: #8d362c; }
.input-status.is-warning { background: #f5f1e5; color: #7a6336; }

.result-panel { display: flex; flex-direction: column; }
.result-heading { margin-bottom: 18px; }
.progress-overview { display: grid; grid-template-columns: auto minmax(90px, 1fr); align-items: center; gap: 5px 16px; padding: 10px 13px; border: 1px solid rgb(56 63 58 / 13%); border-radius: 6px; background: rgb(238 239 234 / 87%); }
.progress-overview-value { display: flex; align-items: baseline; gap: 9px; }
.progress-overview-value > span { color: #77786f; font-size: 10px; }
.progress-overview-value > strong { color: #353b37; font-family: "Segoe UI", "Arial", sans-serif; font-size: 19px; font-weight: 650; font-variant-numeric: lining-nums tabular-nums; }
.progress-overview .progress-track { min-width: 0; margin: 0; background: #d9dbd4; }
.progress-overview > p { grid-column: 1 / -1; margin: 0; color: #85877f; font-size: 9px; line-height: 1.35; }
.settlement-primary-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin-top: 10px; }
.settlement-price { display: grid; min-width: 0; min-height: 112px; align-content: center; gap: 7px; padding: 15px 16px; border: 1px solid rgb(255 255 255 / 16%); border-radius: 6px; background-color: #202724; background-image: linear-gradient(105deg, rgb(24 31 28 / 92%), rgb(35 44 39 / 78%)), url("assets/ink-paper.jpg"); background-position: center; background-size: cover; color: #fffdf7; }
.settlement-price > span { color: rgb(255 253 247 / 78%); font-size: 11px; }
.settlement-price > strong { overflow-wrap: anywhere; color: #fffdf7; font-family: "Segoe UI", "Arial", "Microsoft YaHei", sans-serif; font-size: 32px; font-weight: 700; font-variant-numeric: lining-nums tabular-nums; font-feature-settings: "lnum" 1, "tnum" 1; line-height: 1.08; }
.settlement-price > small { color: rgb(255 253 247 / 64%); font-size: 9px; }
.successor-price { border-color: rgb(255 255 255 / 24%); background-color: #492520; background-image: linear-gradient(105deg, rgb(65 30 25 / 92%), rgb(113 51 41 / 78%)), url("assets/ink-cinnabar.jpg"); }
.progress-detail-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.result-primary { padding: 18px 20px 16px; border-radius: 8px; background-color: #222724; background-image: linear-gradient(100deg, rgb(21 25 23 / 91%), rgb(25 30 27 / 79%)), url("assets/ink-paper.jpg"); background-position: center; background-size: cover; color: #fffdf7; }
.result-primary > span { color: #c2c7bf; font-size: 11px; }
.result-primary > strong { display: block; margin: 7px 0 4px; font-family: "Segoe UI", "Arial", "Microsoft YaHei", sans-serif; font-size: 43px; font-weight: 650; font-variant-numeric: lining-nums tabular-nums; font-feature-settings: "lnum" 1, "tnum" 1; letter-spacing: 0; line-height: 1.12; }
.result-primary > strong small { margin-left: 3px; font-family: "Microsoft YaHei", sans-serif; font-size: 15px; letter-spacing: 0; }
.result-primary > p { margin: 0; color: #b6bbb3; font-size: 11px; line-height: 1.5; }
.progress-track { height: 4px; margin-top: 16px; overflow: hidden; border-radius: 8px; background: #4a504c; }
.progress-track span { display: block; width: 0; height: 100%; border-radius: inherit; background: #c87967; transition: width .24s ease; }
.excess-primary { background-color: #40221f; background-image: linear-gradient(100deg, rgb(40 20 18 / 88%), rgb(62 28 24 / 73%)), url("assets/ink-cinnabar.jpg"); }
.excess-primary > strong { font-size: 36px; }
.result-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; margin-top: 10px; }
.result-metric { display: grid; min-width: 0; min-height: 77px; align-content: center; gap: 5px; padding: 11px 12px; border: 1px solid rgb(56 63 58 / 13%); border-radius: 6px; background-color: rgb(255 254 250 / 91%); background-image: linear-gradient(rgb(255 254 250 / 90%), rgb(255 254 250 / 90%)), url("assets/ink-paper.jpg"); background-position: center; background-size: cover; }
.result-metric > span { color: #77786f; font-size: 10px; }
.result-metric > strong { overflow-wrap: anywhere; color: #292d29; font-family: "Segoe UI", "Arial", "Microsoft YaHei", sans-serif; font-size: 18px; font-weight: 650; font-variant-numeric: lining-nums tabular-nums; font-feature-settings: "lnum" 1, "tnum" 1; letter-spacing: 0; line-height: 1.25; }
.result-metric small { color: #96948b; font-size: 9px; }
.result-highlight { border-color: rgb(164 60 50 / 35%); background-color: #f4e9e4; background-image: linear-gradient(rgb(244 233 228 / 89%), rgb(244 233 228 / 89%)), url("assets/ink-cinnabar.jpg"); }
.result-highlight > strong { color: var(--accent-dark); }
.result-footnote { margin: 12px 0 0; color: #797a72; font-size: 10px; line-height: 1.55; }
.result-actions { gap: 10px; margin-top: auto; padding-top: 17px; }
.copy-button { display: inline-flex; min-height: 39px; align-items: center; justify-content: center; gap: 7px; padding: 0 14px; border: 0; border-radius: 6px; background: var(--accent); color: white; font-size: 11px; font-weight: 650; cursor: pointer; transition: background .15s ease, opacity .15s ease; }
.copy-button:hover:not(:disabled) { background: var(--accent-dark); }
.copy-button:disabled { background: #d6d1c8; color: #f7f5ef; cursor: not-allowed; }
.copy-status { color: #687663; font-size: 10px; }
.page-footer { justify-content: space-between; gap: 12px; padding: 17px 2px 0; color: #898980; font-size: 10px; }
.page-footer i { padding: 0 4px; color: #b3a194; font-style: normal; }

@media (max-width: 760px) {
  .app-shell { width: min(100% - 30px, 540px); padding: 14px 0 18px; }
  .brand-row { min-height: 36px; }
  .brand-mark { width: 32px; height: 32px; border-radius: 10px 10px 10px 3px; }
  .privacy-pill { padding: 7px 9px; font-size: 10px; }
  .intro { min-height: 156px; margin: 13px 0 12px; padding: 22px 20px; border-radius: 8px; }
  .intro-copy { width: 68%; max-width: none; }
  h1 { margin-top: 9px; font-size: 32px; letter-spacing: .015em; white-space: nowrap; }
  .intro-text { max-width: 245px; font-size: 12px; line-height: 1.55; }
  .intro-index { right: 13px; bottom: 10px; font-size: 8px; }
  .mode-switch { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; margin-bottom: 10px; }
  .mode-button { min-height: 73px; gap: 8px; padding: 11px 10px; border-radius: 8px; }
  .mode-number { width: 28px; height: 28px; border-radius: 9px; font-size: 11px; }
  .mode-button strong { font-size: 12px; }
  .mode-button small { max-width: 150px; font-size: 9px; line-height: 1.3; white-space: normal; }
  .mode-arrow { display: none; }
  .workbench { grid-template-columns: minmax(0, 1fr); gap: 10px; }
  .panel { padding: 18px 16px; border-radius: 8px; }
  .panel-heading { margin-bottom: 18px; }
  .panel-heading h2 { font-size: 18px; }
  .calculator-mode { gap: 13px; }
  .field-row { gap: 9px; }
  .field-label { font-size: 11px; }
  .field-label > span { font-size: 9px; }
  input, select { height: 44px; font-size: 14px; }
  .field-hint { font-size: 10px; }
  .input-status { margin-top: 14px; }
  .result-primary { padding: 16px; border-radius: 8px; }
  .result-primary > strong { font-size: 39px; }
  .excess-primary > strong { font-size: 33px; }
  .result-grid { gap: 7px; }
  .progress-overview { grid-template-columns: auto minmax(50px, 1fr); gap: 4px 10px; padding: 9px 11px; }
  .progress-overview-value > span { font-size: 9px; }
  .progress-overview-value > strong { font-size: 17px; }
  .settlement-primary-grid { gap: 8px; }
  .settlement-price { min-height: 96px; padding: 12px 11px; }
  .settlement-price > strong { font-size: 26px; }
  .settlement-price > span { font-size: 10px; }
  .progress-detail-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .result-metric { min-height: 72px; padding: 10px; border-radius: 6px; }
  .result-metric > span { font-size: 9px; }
  .result-metric > strong { font-size: 16px; }
  .page-footer { align-items: flex-start; flex-direction: column; gap: 5px; padding-top: 14px; font-size: 9px; }
}

@media (max-width: 370px) {
  .app-shell { width: calc(100% - 22px); }
  .intro { padding-right: 14px; padding-left: 15px; }
  .intro-copy { width: 70%; }
  h1 { font-size: 29px; }
  .intro-text { max-width: 215px; }
  .mode-button { gap: 7px; padding-right: 7px; padding-left: 8px; }
  .mode-button strong { font-size: 11px; }
  .mode-button small { font-size: 8px; }
  .field-row { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
}