:root {
  --bg: oklch(0.98 0.01 255);
  --surface: oklch(1 0 0);
  --surface-alt: oklch(0.96 0.01 255);
  --text: oklch(0.23 0.03 258);
  --muted: oklch(0.53 0.03 257);
  --line: oklch(0.9 0.01 255);
  --brand: oklch(0.57 0.16 259);
  --brand-strong: oklch(0.49 0.19 262);
  --accent: oklch(0.79 0.1 188);
  --radius: 24px;
  --shadow: 0 20px 50px oklch(0.27 0.05 260 / 0.08);
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, sans-serif;
  background: linear-gradient(180deg, oklch(0.985 0.008 255), oklch(0.965 0.015 255));
  color: var(--text);
  line-height: 1.65;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
}

.narrow {
  max-width: 760px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
  background: oklch(0.98 0.01 255 / 0.82);
  border-bottom: 1px solid oklch(0.9 0.01 255 / 0.8);
}

.nav {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-weight: 800;
  letter-spacing: -0.04em;
}

.nav-links {
  display: flex;
  gap: 1.25rem;
  color: var(--muted);
}

.nav-links a:hover,
.text-link:hover {
  color: var(--brand-strong);
}

.hero,
.page-hero {
  padding: 5rem 0 3rem;
}

.hero-grid,
.request-hero,
.form-layout,
.footer-row,
.cta-panel,
.split-heading {
  display: grid;
  gap: 1.5rem;
}

.hero-grid {
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: oklch(0.94 0.03 257);
  color: var(--brand-strong);
  font-size: 0.875rem;
  font-weight: 700;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

h1 {
  font-size: clamp(2.4rem, 4vw, 4.7rem);
  line-height: 1.02;
  letter-spacing: -0.06em;
  margin: 1rem 0 1rem;
}

h2 {
  font-size: clamp(1.7rem, 2.6vw, 2.7rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
  margin-bottom: 0.75rem;
}

h3 {
  font-size: 1.15rem;
  margin-bottom: 0.6rem;
}

p,
li,
label,
input,
textarea,
select,
button {
  font-size: 1rem;
}

.hero-copy,
.section-heading p,
.lead {
  font-size: 1.08rem;
  color: var(--muted);
}

.card {
  background: oklch(1 0 0 / 0.84);
  border: 1px solid oklch(0.92 0.01 255 / 0.95);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-card,
.feature-card,
.timeline-item,
.case-card,
.faq-item,
.detail-card,
.request-form,
.side-block,
.note-card {
  padding: 1.5rem;
}

.card-label,
.case-tag,
.hint {
  color: var(--brand-strong);
  font-size: 0.88rem;
  font-weight: 700;
}

.hero-actions,
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 1.5rem;
}

.btn {
  appearance: none;
  border: none;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--brand), var(--brand-strong));
  color: white;
  font-weight: 700;
  padding: 0.95rem 1.3rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  transition: transform 180ms ease, box-shadow 180ms ease, opacity 180ms ease;
  box-shadow: 0 12px 30px oklch(0.46 0.13 260 / 0.24);
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--line);
  box-shadow: none;
}

.btn-sm {
  padding: 0.75rem 1rem;
  min-height: 40px;
}

.trust-points,
.check-list,
.ordered-list,
.faq-list,
.stack-list {
  padding-left: 0;
  margin: 1.25rem 0 0;
  list-style: none;
}

.trust-points {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.trust-points li,
.check-list li {
  padding: 0.72rem 0.95rem;
  border-radius: 999px;
  background: oklch(0.95 0.015 255);
}

.compact li {
  border-radius: 18px;
  padding: 0.7rem 0.9rem;
}

.section {
  padding: 1.2rem 0 3.5rem;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 1.5rem;
}

.section-heading.narrow {
  max-width: 680px;
}

.feature-grid,
.case-grid,
.timeline,
.faq-list,
.detail-grid {
  display: grid;
  gap: 1rem;
}

.feature-grid,
.case-grid,
.timeline {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.muted-section {
  background: linear-gradient(180deg, oklch(0.96 0.012 255), oklch(0.94 0.012 255));
  border-top: 1px solid oklch(0.9 0.01 255 / 0.85);
  border-bottom: 1px solid oklch(0.9 0.01 255 / 0.85);
}

.timeline-item span {
  display: inline-flex;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 999px;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.9rem;
  background: oklch(0.94 0.03 257);
  color: var(--brand-strong);
  font-weight: 800;
}

.text-link {
  color: var(--brand-strong);
  font-weight: 700;
}

.cta-panel {
  grid-template-columns: 1.3fr auto;
  align-items: center;
  padding: 2rem;
}

.site-footer {
  padding: 2rem 0 3rem;
}

.footer-row {
  grid-template-columns: 1fr auto;
  align-items: center;
}

.footer-links {
  display: flex;
  gap: 1rem;
  color: var(--muted);
}

.request-hero,
.form-layout {
  grid-template-columns: 1.1fr 0.9fr;
  align-items: start;
}

.request-form {
  display: grid;
  gap: 1rem;
}

.form-row {
  display: grid;
  gap: 0.45rem;
}

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

label {
  font-weight: 700;
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 0.9rem 1rem;
  background: white;
  color: var(--text);
  font: inherit;
}

input:focus,
textarea:focus,
select:focus {
  outline: 2px solid oklch(0.78 0.08 257);
  outline-offset: 2px;
}

.form-note {
  color: var(--muted);
  margin-bottom: 0;
}

.request-side {
  display: grid;
  gap: 1rem;
}

.accent-block {
  background: linear-gradient(180deg, oklch(0.95 0.03 187), oklch(0.98 0.012 255));
}

.detail-card {
  padding: 1.7rem;
}

.detail-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 1.25rem 0 1.5rem;
}

.ordered-list {
  list-style: decimal;
  padding-left: 1.2rem;
}

@media (max-width: 980px) {
  .hero-grid,
  .request-hero,
  .form-layout,
  .cta-panel,
  .footer-row,
  .feature-grid,
  .case-grid,
  .timeline,
  .detail-grid {
    grid-template-columns: 1fr;
  }

  .nav {
    flex-wrap: wrap;
    padding: 0.9rem 0;
  }

  .nav-links {
    order: 3;
    width: 100%;
    overflow-x: auto;
    padding-bottom: 0.25rem;
  }
}

/* ── 表单提交状态 ─────────────────────────────────────────────────────── */
.form-success,
.form-error {
  padding: 1rem 1.25rem;
  border-radius: 16px;
  font-weight: 600;
  line-height: 1.5;
}

.form-success {
  background: oklch(0.94 0.06 155);
  color: oklch(0.3 0.1 155);
  border: 1px solid oklch(0.82 0.08 155);
}

.form-error {
  background: oklch(0.95 0.04 25);
  color: oklch(0.38 0.1 25);
  border: 1px solid oklch(0.84 0.06 25);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* ── 卖家入驻 stack list ─────────────────────────────────────────────── */
.stack-list li {
  padding: 0.72rem 0.95rem;
  border-radius: 18px;
  background: oklch(0.95 0.015 255);
}

@media (max-width: 640px) {
  .container {
    width: min(calc(100% - 1.2rem), var(--max));
  }

  .hero,
  .page-hero {
    padding-top: 3.8rem;
  }

  .two-up {
    grid-template-columns: 1fr;
  }

  .btn,
  .btn-secondary {
    width: 100%;
  }
}