:root {
  --ink: #1c2826;
  --ink-soft: #4d5c58;
  --muted: #6d7b76;
  --line: rgba(28, 40, 38, 0.12);
  --paper: #f3efe8;
  --paper-deep: #e7e1d6;
  --white: #fffcf7;
  --sea: #1f6f66;
  --sea-deep: #164e49;
  --sand: #8d6a45;
  --danger: #8f342c;
  --danger-bg: #fff6f4;
  --shadow: 0 18px 50px rgba(48, 42, 32, 0.08);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Songti SC", "STSong", "Noto Serif SC", serif;
  --sans: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --mono: "SFMono-Regular", "SF Mono", Menlo, Consolas, monospace;
  --header: 76px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 100% -10%, rgba(31, 111, 102, 0.09), transparent 60%),
    radial-gradient(700px 380px at -10% 16%, rgba(141, 106, 69, 0.14), transparent 55%),
    var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
}
body.modal-open { overflow: hidden; }
img, svg { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.28; letter-spacing: 0; }
h1 { margin: 0; font-size: clamp(2.15rem, 4.6vw, 3.55rem); }
h2 { margin: 0; font-size: clamp(1.7rem, 3vw, 2.15rem); }
h3 { margin: 0; font-size: 1.18rem; }
p { margin: 0; }

.skip {
  position: absolute;
  left: 16px;
  top: -48px;
  z-index: 60;
  background: var(--white);
  padding: 8px 12px;
  border-radius: 8px;
}
.skip:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: var(--header);
  padding: 12px 6vw;
  background: rgba(243, 239, 232, 0.9);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
}
.site-header.is-stuck {
  border-bottom-color: var(--line);
  box-shadow: 0 8px 24px rgba(48, 42, 32, 0.04);
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  margin-right: auto;
}
.brand__mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--sea);
  color: #f4f1eb;
  flex: none;
}
.brand__text { display: flex; flex-direction: column; line-height: 1.25; }
.brand__text strong { font-size: 15px; font-weight: 650; }
.brand__text small { color: var(--muted); font-size: 12px; }
.brand__short { display: none; }
.site-nav { display: flex; gap: 22px; }
.site-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 15px;
}
.site-nav a:hover { color: var(--sea-deep); }
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: 999px;
  padding: 8px 12px;
  cursor: pointer;
}
.nav-toggle__bars {
  width: 16px;
  height: 10px;
  border-top: 1.5px solid var(--ink);
  border-bottom: 1.5px solid var(--ink);
  position: relative;
}
.nav-toggle__bars::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 3px;
  border-top: 1.5px solid var(--ink);
}

.hero, .section, .factbar, .site-footer { width: min(1120px, calc(100% - 10vw)); margin-inline: auto; }
.hero {
  display: grid;
  grid-template-columns: 1.25fr 0.85fr;
  gap: 42px;
  align-items: end;
  padding: 54px 0 28px;
}
.eyebrow {
  margin-bottom: 14px;
  color: var(--sea-deep);
  font-size: 14px;
  font-weight: 650;
}
.lead {
  max-width: 38rem;
  margin-top: 18px;
  color: var(--ink-soft);
  font-size: 1.05rem;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.pills { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0 0; padding: 0; list-style: none; }
.pills li {
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255, 252, 247, 0.7);
  border: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 13px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary { background: var(--sea); color: white; }
.btn--primary:hover { background: var(--sea-deep); }
.btn--ghost { background: transparent; border-color: rgba(28, 40, 38, 0.22); }
.btn--ghost:hover { border-color: var(--sea); color: var(--sea-deep); }
.btn--block { width: 100%; }
.btn--submit { position: relative; min-width: 168px; }
.btn:disabled { cursor: wait; transform: none; }
.btn.is-loading .btn__label { opacity: 0; }
.btn.is-loading::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: white;
  animation: spin 0.7s linear infinite;
}
.btn:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--sea);
  outline-offset: 3px;
}

.hero__panel {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 22px 22px 20px;
  box-shadow: var(--shadow);
}
.hero__drawing { color: var(--sea); margin-bottom: 6px; }
.panel__kicker { color: var(--sand); font-size: 13px; font-weight: 650; }
.panel__list { margin: 12px 0 0; padding: 0; list-style: none; counter-reset: item; }
.panel__list li {
  counter-increment: item;
  display: flex;
  gap: 12px;
  padding: 11px 0;
  border-top: 1px solid var(--line);
  color: var(--ink);
}
.panel__list li::before {
  content: counter(item, decimal-leading-zero);
  color: var(--sand);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  padding-top: 2px;
}
.panel__note { margin-top: 8px; color: var(--muted); font-size: 14px; }

.factbar {
  display: grid;
  grid-template-columns: 1.3fr 1.15fr 0.8fr 0.9fr;
  margin-top: 28px;
  background: rgba(255, 252, 247, 0.78);
  border: 1px solid var(--line);
  border-radius: 22px;
  overflow: hidden;
}
.fact { padding: 18px 20px; }
.fact + .fact { border-left: 1px solid var(--line); }
.fact span { display: block; color: var(--muted); font-size: 12px; margin-bottom: 6px; }
.fact strong { display: block; font-size: 15px; font-weight: 650; line-height: 1.45; }
.fact__code { font-family: var(--mono); font-size: 13px; font-weight: 600; letter-spacing: 0.01em; }

.section { padding: 72px 0 0; }
.section__head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 22px; }
.section__index { color: var(--sand); font-variant-numeric: tabular-nums; font-size: 14px; }

.about { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 28px; align-items: start; }
.about__copy { display: grid; gap: 14px; color: var(--ink-soft); max-width: 42rem; }
.about__quiet { color: var(--muted); font-size: 14px; }
.principles { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.principles li {
  background: rgba(255, 252, 247, 0.72);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px 16px 14px;
}
.principles strong { display: block; margin-bottom: 4px; }
.principles span { color: var(--ink-soft); font-size: 14px; }

.cards, .steps { display: grid; gap: 14px; }
.cards { grid-template-columns: repeat(4, 1fr); }
.card, .steps li {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 20px 18px 18px;
}
.card__no, .steps span {
  display: block;
  margin-bottom: 18px;
  color: var(--sand);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
}
.card p, .steps p { margin-top: 8px; color: var(--ink-soft); font-size: 14.5px; }
.card { min-height: 210px; transition: transform 0.2s ease, box-shadow 0.2s ease; }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }

.steps { grid-template-columns: repeat(4, 1fr); list-style: none; margin: 0; padding: 0; }
.steps li { position: relative; }
.steps li:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 32px;
  right: -8px;
  width: 8px;
  height: 1px;
  background: var(--sand);
}

.consult__intro { max-width: 44rem; color: var(--ink-soft); margin-bottom: 22px; }
.consult__intro i { color: var(--danger); font-style: normal; }
.consult { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(260px, 0.72fr); gap: 18px; align-items: start; }
.form-card, .summary {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
}
.form-card { padding: 22px; }
.summary { position: sticky; top: calc(var(--header) + 16px); padding: 22px 20px; }
.progress__meta, .field__label, legend {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
}
.progress__meta { color: var(--muted); font-size: 13px; margin-bottom: 8px; }
.progress__track { height: 6px; border-radius: 99px; background: var(--paper-deep); overflow: hidden; }
.progress__bar { width: 0; height: 100%; background: var(--sea); border-radius: inherit; transition: width 0.25s ease; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 16px; margin-top: 18px; }
.field { min-width: 0; }
.field--full { margin-top: 16px; }
.field__label, legend { margin-bottom: 7px; font-size: 14px; font-weight: 650; padding: 0; }
.field__label em, legend em, .check em { color: var(--danger); font-style: normal; }
.field__state { margin-left: auto; color: var(--sea); font-size: 12px; font-weight: 650; }
.field__optional, .counter { margin-left: auto; color: var(--muted); font-size: 12px; font-weight: 500; }
.field__state + .counter, .field__optional + .counter { margin-left: 10px; }
.field__error { min-height: 0; margin-top: 4px; color: var(--danger); font-size: 13px; }
.field__error:empty { display: none; }
input[type="text"], input[type="tel"], select, textarea {
  width: 100%;
  border: 1px solid rgba(28, 40, 38, 0.16);
  background: #fffdfb;
  border-radius: 14px;
  padding: 12px 14px;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
textarea { min-height: 96px; resize: vertical; }
select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--ink-soft) 50%), linear-gradient(135deg, var(--ink-soft) 50%, transparent 50%);
  background-position: calc(100% - 18px) 55%, calc(100% - 12px) 55%;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
  padding-right: 34px;
}
input::placeholder, textarea::placeholder { color: #93a09c; }
.field:focus-within input, .field:focus-within select, .field:focus-within textarea {
  border-color: var(--sea);
  box-shadow: 0 0 0 4px rgba(31, 111, 102, 0.12);
}
.field.is-valid input, .field.is-valid select, .field.is-valid textarea { border-color: rgba(31, 111, 102, 0.55); }
.field.is-invalid input,
.field.is-invalid select,
.field.is-invalid textarea,
.field.is-invalid .choice span {
  border-color: var(--danger);
  background: var(--danger-bg);
}
.fact__code { overflow-wrap: anywhere; }
.unit { position: relative; }
.unit span {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
}
.unit input { padding-right: 42px; }
fieldset { border: 0; margin: 0; min-width: 0; }
.choices { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.choice { cursor: pointer; }
.choice input { position: absolute; opacity: 0; pointer-events: none; }
.choice span {
  display: grid;
  place-items: center;
  min-height: 52px;
  padding: 8px;
  text-align: center;
  border-radius: 14px;
  border: 1px solid rgba(28, 40, 38, 0.16);
  background: #fffdfb;
  font-size: 14px;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.choice:hover span { border-color: var(--sea); }
.choice input:checked + span {
  background: rgba(31, 111, 102, 0.1);
  border-color: var(--sea);
  color: var(--sea-deep);
  font-weight: 650;
}
.choice input:focus-visible + span { outline: 2px solid var(--sea); outline-offset: 3px; }
.field--check { margin-top: 16px; }
.check { display: flex; gap: 10px; align-items: flex-start; cursor: pointer; color: var(--ink-soft); font-size: 14px; }
.check input { margin-top: 4px; width: 16px; height: 16px; accent-color: var(--sea); flex: none; }
.form__submit { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-top: 18px; }
.form__submit p { flex: 1; min-width: 220px; color: var(--muted); font-size: 13px; }

.summary__kicker { color: var(--sand); font-size: 13px; font-weight: 650; }
.summary h3 { margin: 6px 0 14px; font-size: 1.45rem; }
.summary dl { margin: 0; display: grid; gap: 0; }
.summary dl div { display: grid; grid-template-columns: 72px 1fr; gap: 8px; padding: 9px 0; border-top: 1px solid var(--line); }
.summary dt { color: var(--muted); font-size: 13px; }
.summary dd { margin: 0; font-weight: 600; overflow-wrap: anywhere; }
.summary dd.is-empty { color: #a3aeaa; font-weight: 500; }
.summary__status {
  margin-top: 14px;
  padding: 10px 12px;
  border-radius: 12px;
  background: var(--paper);
  color: var(--ink-soft);
  font-size: 13px;
}
.summary__status.is-ready { background: rgba(31, 111, 102, 0.1); color: var(--sea-deep); }

.site-footer {
  display: grid;
  gap: 10px;
  margin-top: 72px;
  margin-bottom: 28px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 14px;
}
.site-footer strong { color: var(--ink); font-size: 16px; }
.site-footer p { margin-top: 4px; }
.site-footer__note { color: var(--muted); font-size: 13px; }

.modal[hidden] { display: none; }
.modal { position: fixed; inset: 0; z-index: 50; display: grid; place-items: center; padding: 22px; }
.modal__backdrop { position: absolute; inset: 0; background: rgba(28, 40, 38, 0.46); }
.modal__dialog {
  position: relative;
  width: min(460px, 100%);
  max-height: min(720px, calc(100vh - 32px));
  overflow: auto;
  background: var(--white);
  border-radius: 28px;
  padding: 28px 26px 22px;
  box-shadow: 0 30px 80px rgba(20, 24, 22, 0.22);
  animation: rise 0.35s ease;
}
.modal__mark { width: 72px; height: 72px; margin-bottom: 12px; color: var(--sea); }
.modal__mark circle, .modal__mark path { fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; }
.modal__mark circle { stroke-width: 2.4; stroke-dasharray: 210; stroke-dashoffset: 210; animation: draw 0.6s ease forwards; }
.modal__mark path { stroke-width: 3.2; stroke-dasharray: 48; stroke-dashoffset: 48; animation: draw 0.4s ease forwards 0.35s; }
.modal__kicker { color: var(--sand); font-size: 13px; font-weight: 650; letter-spacing: 0.02em; }
.modal__dialog h2 { margin: 6px 0 10px; font-size: 2rem; }
.modal__lead { color: var(--ink-soft); }
.modal__steps { margin: 16px 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.modal__steps li {
  display: flex;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  background: var(--paper);
  font-size: 14.5px;
}
.modal__steps li::before {
  content: "";
  width: 8px;
  height: 8px;
  margin-top: 8px;
  border-radius: 50%;
  background: var(--sea);
  flex: none;
}
.modal__hint { margin-bottom: 18px; color: var(--muted); font-size: 13px; }
.noscript {
  width: min(1120px, calc(100% - 10vw));
  margin: 12px auto 28px;
  padding: 12px 14px;
  border-radius: 12px;
  background: #fff6e8;
}

@media (max-width: 980px) {
  .hero, .about, .cards, .steps, .consult { grid-template-columns: 1fr; }
  .factbar { grid-template-columns: 1fr 1fr; }
  .fact:nth-child(odd) { border-left: 0; }
  .fact:nth-child(even) { border-left: 1px solid var(--line); }
  .fact:nth-child(n + 3) { border-top: 1px solid var(--line); }
  .steps li::after { display: none; }
  .summary { position: static; }
  .cards .card { min-height: 0; }
}
@media (max-width: 760px) {
  .brand__full { display: none; }
  .brand__short { display: inline; }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    display: none;
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 8px 6vw 16px;
    background: rgba(243, 239, 232, 0.98);
    border-bottom: 1px solid var(--line);
  }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 12px 0; border-top: 1px solid var(--line); }
  .hero { padding-top: 28px; }
  .section { padding-top: 52px; }
  .form-grid, .choices, .factbar { grid-template-columns: 1fr 1fr; }
  .form-card, .hero__panel, .modal__dialog { border-radius: 22px; }
}
@media (max-width: 560px) {
  .form-grid, .choices { grid-template-columns: 1fr; }
  .factbar { grid-template-columns: 1fr; }
  .fact + .fact { border-left: 0; border-top: 1px solid var(--line); }
  .hero__actions .btn, .btn--submit { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes rise {
  from { opacity: 0; transform: translateY(10px) scale(0.98); }
  to { opacity: 1; transform: none; }
}