/* 开源字体：Outfit（SIL OFL）+ 思源宋/黑 Noto（SIL OFL） */
@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;700&family=Noto+Serif+SC:wght@500;600;700&family=Outfit:wght@400;500;600;700&display=swap");

:root {
  /* 芋头浅紫 */
  --taro: #c4b0d4;
  --taro-deep: #8b6fa3;
  --taro-ink: #3d2f4a;
  --taro-soft: #ebe3f2;
  --taro-mist: #f6f1fa;
  --ink: #2a2233;
  --ink-soft: #4a3f56;
  --muted: #6e6478;
  --paper: #faf7fc;
  --line: rgba(61, 47, 74, 0.12);
  --surface: rgba(255, 255, 255, 0.82);
  --glow: #e2d4ef;
  --font-display: "Noto Serif SC", "Source Han Serif SC", serif;
  --font-body: "Outfit", "Noto Sans SC", "PingFang SC", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}

a {
  color: inherit;
}

/* ---- Nav ---- */
.nav {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: min(1120px, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 1.25rem 0 0;
}

.nav-brand {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.03em;
  text-decoration: none;
  white-space: nowrap;
}

.nav-brand span {
  color: var(--glow);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
  font-size: 0.88rem;
  font-weight: 500;
}

.nav-links a {
  text-decoration: none;
  opacity: 0.78;
  transition: opacity 0.2s;
}

.nav-links a:hover,
.nav-links a.is-active {
  opacity: 1;
}

.nav--light .nav-brand,
.nav--light .nav-links a {
  color: var(--ink);
}

.nav--light .nav-brand span {
  color: var(--taro-deep);
}

.nav--dark .nav-brand,
.nav--dark .nav-links a {
  color: #f8f4fc;
}

/* ---- Hero ---- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  color: #f8f4fc;
  background:
    radial-gradient(ellipse 70% 55% at 75% 15%, rgba(196, 176, 212, 0.45), transparent 55%),
    radial-gradient(ellipse 45% 40% at 10% 85%, rgba(139, 111, 163, 0.4), transparent 50%),
    linear-gradient(155deg, #2a2233 0%, #4a3a5c 45%, #3d2f4a 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black, transparent 80%);
  pointer-events: none;
  animation: grid-drift 18s linear infinite;
}

.hero::after {
  content: "";
  position: absolute;
  width: min(52vw, 560px);
  aspect-ratio: 1;
  right: -8%;
  bottom: -18%;
  border-radius: 42% 58% 55% 45%;
  background:
    radial-gradient(circle at 35% 35%, rgba(226, 212, 239, 0.55), transparent 55%),
    radial-gradient(circle at 70% 70%, rgba(139, 111, 163, 0.45), transparent 60%);
  filter: blur(2px);
  animation: blob 10s ease-in-out infinite alternate;
  pointer-events: none;
}

.hero-main {
  position: relative;
  z-index: 2;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: min(1120px, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 2.5rem 0 4.5rem;
}

.brand-mark {
  margin: 0 0 1.1rem;
  font-size: clamp(2.8rem, 8vw, 5.2rem);
  font-weight: 700;
  letter-spacing: -0.055em;
  line-height: 0.95;
  animation: rise 0.8s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.brand-mark span {
  color: var(--glow);
}

.headline {
  margin: 0 0 1rem;
  max-width: 18em;
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 3.6vw, 2.55rem);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.01em;
  animation: rise 0.8s cubic-bezier(0.22, 1, 0.36, 1) 0.08s both;
}

.headline em {
  font-style: italic;
  color: var(--glow);
}

.sub {
  margin: 0 0 2rem;
  max-width: 36rem;
  font-size: 1.05rem;
  color: rgba(248, 244, 252, 0.8);
  animation: rise 0.8s cubic-bezier(0.22, 1, 0.36, 1) 0.14s both;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  animation: rise 0.8s cubic-bezier(0.22, 1, 0.36, 1) 0.2s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.25rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s ease, background 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--taro-soft);
  color: var(--taro-ink);
}

.btn-primary:hover {
  background: #fff;
}

.btn-ghost {
  border: 1px solid rgba(248, 244, 252, 0.35);
  color: #f8f4fc;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
}

.btn-solid {
  background: var(--taro-deep);
  color: #fff;
}

.btn-solid:hover {
  background: #7a5f94;
}

.btn-outline {
  border: 1px solid var(--line);
  color: var(--ink);
  background: transparent;
}

/* ---- Page shell (inner pages) ---- */
.topbar {
  background: linear-gradient(180deg, var(--taro-mist), var(--paper));
  border-bottom: 1px solid var(--line);
  padding-bottom: 1.25rem;
}

.page-hero {
  width: min(1120px, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 2.5rem 0 1rem;
}

.page-hero h1 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--taro-ink);
}

.page-hero p {
  margin: 0;
  max-width: 40rem;
  color: var(--muted);
  font-size: 1.05rem;
}

/* ---- Sections ---- */
.section {
  width: min(1120px, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 3.75rem 0;
}

.section h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--taro-ink);
}

.section > .lead,
.section > p.lead {
  margin: 0 0 2rem;
  max-width: 42rem;
  color: var(--muted);
}

.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.pillar {
  padding: 1.35rem 0;
  border-top: 2px solid var(--taro);
}

.pillar h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 600;
}

.pillar p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.model-band {
  background:
    linear-gradient(180deg, rgba(235, 227, 242, 0.85), rgba(250, 247, 252, 0)),
    var(--paper);
}

.model-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2.5rem;
  align-items: end;
}

.model-term {
  margin: 0;
  padding: 1.5rem 1.6rem;
  border-left: 3px solid var(--taro-deep);
  background: linear-gradient(90deg, rgba(196, 176, 212, 0.22), transparent);
}

.model-term strong {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 1.15rem;
}

.model-term p {
  margin: 0;
  color: var(--ink-soft);
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  counter-reset: step;
}

.step {
  padding: 1.2rem 1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
}

.step::before {
  counter-increment: step;
  content: "0" counter(step);
  display: block;
  margin-bottom: 0.6rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--taro-deep);
}

.step h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
}

.step p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
  font-size: 0.95rem;
}

.compare-table th,
.compare-table td {
  padding: 0.95rem 1.1rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.compare-table thead th {
  background: var(--taro-mist);
  color: var(--taro-ink);
  font-weight: 700;
}

.compare-table thead th:last-child {
  background: rgba(196, 176, 212, 0.35);
}

.compare-table tbody th {
  width: 22%;
  font-weight: 600;
  color: var(--ink);
  background: rgba(250, 247, 252, 0.8);
}

.compare-table td {
  color: var(--ink-soft);
  width: 39%;
}

.compare-table tbody tr:last-child th,
.compare-table tbody tr:last-child td {
  border-bottom: none;
}

.compare-table .is-focus {
  color: var(--taro-ink);
  font-weight: 500;
}

.faq-list {
  display: grid;
  gap: 0.75rem;
  max-width: 820px;
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  padding: 0 1.1rem;
}

.faq-item summary {
  cursor: pointer;
  list-style: none;
  padding: 1rem 0;
  font-weight: 600;
  color: var(--taro-ink);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  float: right;
  color: var(--taro-deep);
  font-weight: 700;
}

.faq-item[open] summary::after {
  content: "–";
}

.faq-item p {
  margin: 0 0 1rem;
  color: var(--muted);
  padding-bottom: 0.25rem;
}

.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.compare-col {
  padding: 1.4rem 1.5rem;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: #fff;
}

.compare-col.is-focus {
  border-color: rgba(139, 111, 163, 0.45);
  background: linear-gradient(160deg, #fff, var(--taro-soft));
}

.compare-col h3 {
  margin: 0 0 0.75rem;
  font-size: 1.05rem;
}

.compare-col ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.compare-col li + li {
  margin-top: 0.4rem;
}

.prose {
  max-width: 44rem;
}

.prose p {
  margin: 0 0 1rem;
  color: var(--ink-soft);
}

.prose h3 {
  margin: 2rem 0 0.6rem;
  font-size: 1.15rem;
  color: var(--taro-ink);
}

.feature-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem 2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.feature-list li {
  padding: 1rem 0;
  border-top: 1px solid var(--line);
}

.feature-list strong {
  display: block;
  margin-bottom: 0.25rem;
}

.feature-list span {
  color: var(--muted);
  font-size: 0.95rem;
}

.quote {
  margin: 2rem 0 0;
  padding: 1.5rem 1.6rem;
  border-radius: 16px;
  background: var(--taro-soft);
  color: var(--taro-ink);
  font-family: var(--font-display);
  font-size: 1.35rem;
  line-height: 1.35;
}

.gate-note {
  margin-top: 1.5rem;
  padding: 1rem 1.15rem;
  border: 1px solid rgba(139, 111, 163, 0.3);
  background: rgba(196, 176, 212, 0.18);
  color: var(--taro-ink);
  font-weight: 500;
  border-radius: 12px;
}

.gate-note a {
  color: var(--taro-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.cta-band {
  margin: 1rem 0 3rem;
  padding: 2rem;
  border-radius: 18px;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(226, 212, 239, 0.9), transparent 50%),
    linear-gradient(135deg, #4a3a5c, #3d2f4a);
  color: #f8f4fc;
}

.cta-band h2 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 400;
  color: #fff;
}

.cta-band p {
  margin: 0 0 1.25rem;
  color: rgba(248, 244, 252, 0.8);
  max-width: 36rem;
}

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0 2.5rem;
  background: #fff;
}

.site-footer-inner {
  width: min(1120px, calc(100% - 2.5rem));
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 2.5rem;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.88rem;
}

.site-footer strong {
  display: block;
  color: var(--ink);
  font-size: 0.95rem;
  margin-bottom: 0.35rem;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin: 0.75rem 0 0;
}

.footer-nav a {
  text-decoration: none;
  color: var(--taro-deep);
  font-weight: 500;
}

.icp-list {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.25rem 0.85rem;
  margin: 0;
}

.icp-list dt {
  margin: 0;
  opacity: 0.8;
}

.icp-list dd {
  margin: 0;
}

/* ---- Compact unlock page ---- */
.page {
  width: min(720px, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 4.5rem 0 3.5rem;
}

.ok-badge {
  display: inline-block;
  margin-bottom: 1rem;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: rgba(196, 176, 212, 0.3);
  color: var(--taro-ink);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page .brand {
  margin: 0 0 0.75rem;
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--taro-ink);
}

.page .lead {
  margin: 0 0 1.5rem;
  color: var(--muted);
}

.panel {
  padding: 1.25rem 0;
  border-top: 1px solid var(--line);
}

.meta {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: 0.55rem 1rem;
  margin: 0;
}

.meta dt {
  margin: 0;
  color: var(--muted);
}

.meta dd {
  margin: 0;
  font-weight: 500;
}

.footer {
  margin-top: 1.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

/* ---- Contact form ---- */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem 1.25rem;
  max-width: 720px;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-field--full {
  grid-column: 1 / -1;
}

.form-field label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--taro-ink);
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  padding: 0.8rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--taro);
  box-shadow: 0 0 0 3px rgba(196, 176, 212, 0.35);
}

.form-field textarea {
  min-height: 140px;
  resize: vertical;
}

.form-actions {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem;
  margin-top: 0.25rem;
}

.form-hint {
  font-size: 0.88rem;
  color: var(--muted);
}

.form-status {
  display: none;
  margin: 0 0 1.25rem;
  padding: 0.9rem 1.1rem;
  border-radius: 12px;
  font-weight: 500;
}

.form-status.is-ok {
  display: block;
  background: rgba(196, 176, 212, 0.25);
  color: var(--taro-ink);
}

.form-status.is-err {
  display: block;
  background: rgba(160, 70, 90, 0.1);
  color: #7a3044;
}

.hp {
  position: absolute;
  left: -9999px;
  opacity: 0;
  height: 0;
  width: 0;
  overflow: hidden;
}

@media (max-width: 900px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes blob {
  from {
    transform: translate(0, 0) scale(1);
  }
  to {
    transform: translate(-4%, -6%) scale(1.06);
  }
}

@keyframes grid-drift {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(72px);
  }
}

@media (max-width: 900px) {
  .pillars,
  .steps,
  .model-grid,
  .compare,
  .feature-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .nav,
  .hero-main,
  .section,
  .site-footer-inner,
  .page,
  .page-hero {
    width: min(100% - 1.5rem, 1120px);
  }

  .nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .meta {
    grid-template-columns: 1fr;
  }
}