:root {
  --ink: #10203d;
  --muted: #59677f;
  --line: #d9e1ee;
  --paper: #ffffff;
  --mist: #f4f7fb;
  --warm: #e86f28;
  --warm-deep: #b94f16;
  --green: #0f8f73;
  --blue: #1f4d8f;
  --shadow: 0 24px 70px rgba(20, 39, 72, .13);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(232, 111, 40, .10), transparent 34rem),
    linear-gradient(180deg, #fbfcff 0%, #f6f8fc 46%, #ffffff 100%);
  font-family: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  letter-spacing: 0;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 78px;
  padding: 14px clamp(20px, 4vw, 64px);
  background: rgba(255, 255, 255, .88);
  border-bottom: 1px solid rgba(217, 225, 238, .84);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 230px;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 17px;
  line-height: 1.2;
}

.brand small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

.top-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex: 1;
  color: #34425b;
  font-size: 14px;
  font-weight: 700;
}

.top-nav a:hover {
  color: var(--warm-deep);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.ghost-link,
.small-cta,
.primary-cta,
.secondary-cta,
.band-link,
.account-actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border-radius: 999px;
  font-weight: 800;
  white-space: nowrap;
}

.ghost-link {
  padding: 0 14px;
  color: #33425c;
}

.small-cta {
  padding: 0 18px;
  color: #fff;
  background: var(--ink);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, .86fr);
  gap: clamp(30px, 5vw, 80px);
  align-items: center;
  padding: clamp(54px, 7vw, 96px) clamp(20px, 5vw, 82px) 64px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--warm-deep);
  font-size: 13px;
  font-weight: 900;
}

.hero h1 {
  max-width: 820px;
  margin: 0;
  font-size: clamp(42px, 6vw, 78px);
  line-height: .98;
  letter-spacing: 0;
}

.lead {
  max-width: 760px;
  margin: 24px 0 0;
  color: #3d4b63;
  font-size: clamp(17px, 2vw, 22px);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.primary-cta,
.secondary-cta {
  min-height: 54px;
  padding: 0 24px;
  font-size: 16px;
}

.primary-cta {
  color: #fff;
  background: var(--warm);
  box-shadow: 0 16px 34px rgba(232, 111, 40, .27);
}

.secondary-cta {
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
}

.trust-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.trust-strip span {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: #43526a;
  background: rgba(255, 255, 255, .72);
  font-size: 13px;
  font-weight: 800;
}

.hero-art {
  padding: 18px;
  border: 1px solid rgba(217, 225, 238, .9);
  border-radius: 28px;
  background: rgba(255, 255, 255, .76);
  box-shadow: var(--shadow);
}

.hero-art img {
  display: block;
  width: 100%;
  height: auto;
}

.section,
.feature-band,
.account-section {
  margin: 0 clamp(20px, 5vw, 82px);
}

.section {
  padding: 70px 0;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 30px;
}

.section-heading h2,
.feature-band h2,
.account-section h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.14;
}

.section-heading p:not(.section-kicker),
.feature-band p,
.account-section p {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.7;
}

.core-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.core-card {
  display: flex;
  flex-direction: column;
  min-height: 250px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 16px 40px rgba(31, 55, 94, .08);
  transition: transform .18s ease, box-shadow .18s ease;
}

.core-card:hover,
.developer-card:hover,
.tool-row:hover {
  transform: translateY(-3px);
  box-shadow: 0 22px 52px rgba(31, 55, 94, .14);
}

.card-label {
  align-self: flex-start;
  margin-bottom: 28px;
  padding: 7px 10px;
  border-radius: 999px;
  color: #fff;
  background: var(--blue);
  font-size: 12px;
  font-weight: 900;
}

.core-card.orange .card-label { background: var(--warm); }
.core-card.green .card-label { background: var(--green); }
.core-card.ink .card-label { background: var(--ink); }

.core-card strong {
  display: block;
  margin-bottom: 12px;
  font-size: 22px;
  line-height: 1.24;
}

.core-card span:not(.card-label) {
  color: var(--muted);
  line-height: 1.65;
}

.core-card em {
  margin-top: auto;
  color: var(--warm-deep);
  font-style: normal;
  font-weight: 900;
}

.writing-section {
  border-top: 1px solid var(--line);
}

.tool-group-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.tool-group {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.tool-group h3 {
  margin: 0 0 8px;
  font-size: 24px;
}

.tool-group p {
  min-height: 54px;
  margin: 0 0 18px;
  color: var(--muted);
  line-height: 1.6;
}

.tool-list {
  display: grid;
  gap: 10px;
}

.tool-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px;
  border: 1px solid #e6edf6;
  border-radius: 14px;
  background: #f9fbfe;
  transition: transform .18s ease, box-shadow .18s ease;
}

.tool-row strong,
.tool-row small {
  display: block;
}

.tool-row small {
  margin-top: 4px;
  color: var(--muted);
  line-height: 1.4;
}

.tool-row b {
  flex: 0 0 auto;
  padding: 6px 8px;
  border-radius: 999px;
  color: #0d6d59;
  background: #e5f8f3;
  font-size: 12px;
}

.feature-band,
.account-section {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: center;
  padding: clamp(28px, 5vw, 46px);
  border-radius: 26px;
  background: var(--ink);
  color: #fff;
}

.feature-band p,
.account-section p {
  color: rgba(255, 255, 255, .78);
}

.feature-band .section-kicker,
.account-section .section-kicker {
  color: #ffd5bd;
}

.band-link,
.account-actions a {
  min-height: 50px;
  padding: 0 20px;
  color: var(--ink);
  background: #fff;
}

.developer-section {
  border-bottom: 1px solid var(--line);
}

.developer-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.developer-card {
  min-height: 210px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 16px 40px rgba(31, 55, 94, .08);
  transition: transform .18s ease, box-shadow .18s ease;
}

.developer-card span {
  display: inline-flex;
  margin-bottom: 28px;
  padding: 7px 10px;
  border-radius: 999px;
  color: var(--warm-deep);
  background: #fff1e9;
  font-size: 12px;
  font-weight: 900;
}

.developer-card strong {
  display: block;
  font-size: 24px;
}

.developer-card p,
.developer-note {
  color: var(--muted);
  line-height: 1.7;
}

.developer-note {
  margin-top: 18px;
  font-size: 14px;
}

.account-section {
  margin-top: 70px;
  background:
    linear-gradient(135deg, rgba(16, 32, 61, .96), rgba(22, 71, 90, .96)),
    var(--ink);
}

.account-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 34px clamp(20px, 5vw, 82px);
  color: #66758c;
  font-size: 14px;
}

.site-footer strong,
.site-footer span {
  display: block;
}

.site-footer div span {
  margin-top: 6px;
}

@media (max-width: 1080px) {
  .hero,
  .feature-band,
  .account-section {
    grid-template-columns: 1fr;
  }

  .core-grid,
  .tool-group-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .top-nav {
    display: none;
  }
}

@media (max-width: 700px) {
  .site-header {
    position: static;
    flex-wrap: wrap;
    gap: 12px;
    padding: 14px 18px;
  }

  .brand {
    min-width: 0;
    flex: 1;
  }

  .hero {
    padding: 42px 18px 42px;
  }

  .hero h1 {
    font-size: 42px;
  }

  .hero-actions,
  .header-actions,
  .account-actions {
    width: 100%;
  }

  .primary-cta,
  .secondary-cta,
  .small-cta,
  .ghost-link,
  .account-actions a,
  .band-link {
    width: 100%;
  }

  .section,
  .feature-band,
  .account-section {
    margin-left: 18px;
    margin-right: 18px;
  }

  .section {
    padding: 48px 0;
  }

  .core-grid,
  .tool-group-grid,
  .developer-grid {
    grid-template-columns: 1fr;
  }

  .tool-group p {
    min-height: 0;
  }

  .site-footer {
    display: block;
    padding: 28px 18px;
  }

  .site-footer > span {
    margin-top: 14px;
  }
}