:root {
  --paper: #F4EFE4;
  --sheet: #FBF8F0;
  --ink: #1A1A1A;
  --cyan: #00A3B5;
  --proof: #C41E3A;
  --proof-deep: #9A1730;
  --hair: #B8B0A4;
  --muted: #4A453E;
  --stamp: #FFF8F6;
  --rule-gap: 28px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun", "Microsoft YaHei", serif;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, rgba(184, 176, 164, 0.28) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(184, 176, 164, 0.22) 1px, transparent 1px);
  background-size: 48px 48px;
  line-height: 1.85;
  font-size: 16.5px;
}

img,
svg {
  max-width: 100%;
  vertical-align: middle;
}

a {
  color: var(--cyan);
  text-decoration: none;
}

a:hover {
  color: var(--proof);
  text-decoration: underline;
}

p {
  margin: 0 0 1em;
}

h1,
h2,
h3 {
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
}

h1 {
  font-size: clamp(1.7rem, 3vw, 2.25rem);
  margin: 0 0 16px;
  letter-spacing: 0.04em;
}

h2 {
  font-size: 1.35rem;
  margin: 0 0 14px;
  letter-spacing: 0.08em;
}

h3 {
  font-size: 1.08rem;
  margin: 0 0 10px;
}

.wrap {
  width: min(1080px, calc(100% - 36px));
  margin: 0 auto;
}

.reg-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 0;
  border-bottom: 1px solid var(--hair);
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.reg-bar .reg-marks {
  display: flex;
  align-items: center;
  gap: 10px;
}

.reg-cross {
  width: 22px;
  height: 22px;
  flex: 0 0 22px;
}

.site-head {
  background: var(--sheet);
  border-bottom: 2px solid var(--ink);
  box-shadow: 0 1px 0 var(--cyan);
  position: relative;
}

.site-head::before,
.site-head::after {
  content: "";
  position: absolute;
  top: 10px;
  width: 14px;
  height: 14px;
  border-color: var(--ink);
  border-style: solid;
}

.site-head::before {
  left: 10px;
  border-width: 1px 0 0 1px;
}

.site-head::after {
  right: 10px;
  border-width: 1px 1px 0 0;
}

.head-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 86px;
  padding: 14px 0 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
}

.brand:hover {
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  width: 52px;
  height: 52px;
  flex: 0 0 52px;
}

.brand-kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.brand-name {
  margin: 2px 0 0;
  font-size: 1.2rem;
  letter-spacing: 0.12em;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  align-items: center;
}

.site-nav a {
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.16em;
  padding: 4px 0 6px;
  border-bottom: 2px solid transparent;
}

.site-nav a:hover {
  color: var(--proof);
  text-decoration: none;
  border-bottom-color: var(--hair);
}

.site-nav a.is-current {
  color: var(--proof);
  border-bottom-color: var(--proof);
}

.folio {
  border-bottom: 1px solid var(--hair);
  background: rgba(251, 248, 240, 0.86);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.folio-inner {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
}

.hero {
  padding: 36px 0 12px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 28px;
  align-items: stretch;
}

.hero-copy .kicker {
  margin: 0 0 10px;
  color: var(--cyan);
  letter-spacing: 0.2em;
  font-size: 13px;
}

.hero-copy .lead {
  color: var(--ink);
}

.hero-note {
  margin-top: 8px;
  padding: 10px 12px;
  border-left: 3px solid var(--proof);
  background: rgba(196, 30, 58, 0.06);
  font-size: 14px;
}

.stamp-card {
  position: relative;
  background: var(--stamp);
  border: 2px solid var(--proof);
  padding: 22px 20px 24px;
  box-shadow: 6px 6px 0 rgba(0, 163, 181, 0.18);
}

.stamp-card::before,
.stamp-card::after {
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
  border-color: var(--ink);
  border-style: solid;
}

.stamp-card::before {
  top: 6px;
  left: 6px;
  border-width: 1px 0 0 1px;
}

.stamp-card::after {
  bottom: 6px;
  right: 6px;
  border-width: 0 1px 1px 0;
}

.stamp-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.stamp-seal {
  width: 72px;
  height: 72px;
  flex: 0 0 72px;
}

.stamp-card h2 {
  margin: 0;
  color: var(--proof);
  letter-spacing: 0.18em;
  font-size: 1.1rem;
}

.stamp-meta {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.08em;
}

.stamp-card p {
  font-size: 15px;
}

.sheet-frame {
  position: relative;
  margin: 22px 0 34px;
  padding: 14px 0 0;
}

.sheet-frame .cm {
  position: absolute;
  width: 14px;
  height: 14px;
  border-color: var(--ink);
  border-style: solid;
}

.sheet-frame .cm-tl { top: 0; left: 0; border-width: 1px 0 0 1px; }
.sheet-frame .cm-tr { top: 0; right: 0; border-width: 1px 1px 0 0; }
.sheet-frame .cm-bl { bottom: 0; left: 0; border-width: 0 0 1px 1px; }
.sheet-frame .cm-br { bottom: 0; right: 0; border-width: 0 1px 1px 0; }

.proof-sheet {
  background: var(--sheet);
  border: 1px solid var(--hair);
  border-left: 4px solid var(--cyan);
  padding: 22px 26px 26px;
  position: relative;
}

.proof-sheet.alt {
  border-left-color: var(--proof);
}

.sheet-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 16px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--hair);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.sheet-meta .proof-tag {
  color: var(--proof);
}

.mark {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--proof);
  font-size: 13px;
  letter-spacing: 0.12em;
  margin-bottom: 8px;
}

.mark svg {
  width: 22px;
  height: 16px;
}

.signoff {
  margin: 0 0 18px;
}

.signoff:last-child {
  margin-bottom: 0;
}

.signoff-title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
}

.signoff-title .no {
  color: var(--cyan);
  letter-spacing: 0.16em;
  font-size: 13px;
}

.signoff + .signoff {
  padding-top: 16px;
  border-top: 1px solid var(--hair);
}

.dl-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

button {
  font-family: inherit;
  cursor: pointer;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  min-height: 48px;
  padding: 10px 14px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  letter-spacing: 0.1em;
  font-size: 15px;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn svg {
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
}

.btn:hover {
  background: var(--proof);
  border-color: var(--proof);
  color: #fff;
}

.btn-cyan {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #fff;
}

.btn-cyan:hover {
  background: var(--ink);
  border-color: var(--ink);
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
}

.btn-ghost:hover {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #fff;
}

.btn-proof {
  background: var(--proof);
  border-color: var(--proof);
  color: #fff;
}

.btn-proof:hover {
  background: var(--proof-deep);
  border-color: var(--proof-deep);
}

.btn-xl {
  min-height: 64px;
  font-size: 1.05rem;
  letter-spacing: 0.16em;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border: 1px solid var(--hair);
  background: var(--sheet);
}

.stat {
  padding: 16px 14px;
  text-align: center;
  border-right: 1px solid var(--hair);
}

.stat:last-child {
  border-right: 0;
}

.stat b {
  display: block;
  color: var(--cyan);
  font-size: 1.55rem;
  letter-spacing: 0.06em;
  line-height: 1.2;
}

.stat span {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.review {
  padding: 14px 0 16px;
}

.review + .review {
  border-top: 1px dashed var(--hair);
}

.review-who {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
  letter-spacing: 0.1em;
}

.review-who strong {
  color: var(--proof);
}

.compare {
  width: 100%;
  border-collapse: collapse;
  background: var(--sheet);
  font-size: 15px;
}

.compare th,
.compare td {
  border: 1px solid var(--hair);
  padding: 10px 12px;
  vertical-align: top;
  text-align: left;
}

.compare th {
  background: rgba(0, 163, 181, 0.1);
  letter-spacing: 0.08em;
}

.compare td:first-child {
  white-space: nowrap;
  color: var(--muted);
}

.faq-item {
  padding: 14px 0 16px;
}

.faq-item + .faq-item {
  border-top: 1px solid var(--hair);
}

.faq-item h3 {
  color: var(--ink);
}

.faq-item h3::before {
  content: "校问 ";
  color: var(--proof);
  letter-spacing: 0.12em;
  font-size: 13px;
}

.steps h3 {
  margin-top: 18px;
}

.steps ol {
  margin: 0 0 12px 1.2em;
  padding: 0;
}

.steps li {
  margin-bottom: 8px;
}

.cta-band {
  margin: 28px 0 8px;
  padding: 22px 24px;
  border: 2px solid var(--ink);
  background: var(--sheet);
  text-align: center;
}

.cta-band p {
  margin-bottom: 14px;
}

.cta-band .btn {
  width: auto;
  min-width: 260px;
  padding-left: 28px;
  padding-right: 28px;
}

.site-foot {
  margin-top: 20px;
  background: var(--ink);
  color: #E8E2D6;
  padding: 28px 0 36px;
  position: relative;
}

.site-foot::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--proof), var(--cyan));
}

.site-foot a {
  color: #7FE3EE;
}

.site-foot .safe {
  border: 1px solid rgba(0, 163, 181, 0.45);
  padding: 10px 12px;
  margin-bottom: 12px;
  letter-spacing: 0.04em;
}

.site-foot .legal {
  font-size: 14px;
  line-height: 1.75;
  color: #C9C2B6;
}

.icon {
  width: 18px;
  height: 18px;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@media (max-width: 860px) {
  .head-inner,
  .hero-grid,
  .dl-row,
  .stat-row {
    grid-template-columns: 1fr;
    display: flex;
    flex-direction: column;
  }

  .head-inner {
    align-items: flex-start;
  }

  .dl-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .stat-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .stat {
    border-right: 0;
    border-bottom: 1px solid var(--hair);
  }

  .stat:nth-child(odd) {
    border-right: 1px solid var(--hair);
  }

  .compare td:first-child {
    white-space: normal;
  }

  .folio-inner {
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  .dl-row {
    grid-template-columns: 1fr;
  }

  .cta-band .btn {
    width: 100%;
    min-width: 0;
  }
}