:root {
  --navy: #152238;
  --ink: #243049;
  --muted: #5a6578;
  --paper: #f3efe6;
  --card: #fffdf8;
  --line: #ddd4c4;
  --coral: #e04b3c;
  --teal: #1f8a7a;
  --gold: #d9a441;
  --sky: #3d7ea6;
  --focus: #1f5f8a;
  --shadow: 0 12px 32px rgba(21, 34, 56, 0.1);
  --radius: 16px;
  --wrap: 1120px;
  --font: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 12%, rgba(224, 75, 60, 0.06), transparent 28%),
    radial-gradient(circle at 92% 8%, rgba(31, 138, 122, 0.07), transparent 26%),
    var(--paper);
  line-height: 1.65;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--teal);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--navy);
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: 12px;
  top: -48px;
  z-index: 80;
  background: var(--card);
  color: var(--navy);
  padding: 0.5rem 0.9rem;
  border-radius: 8px;
}

.skip:focus {
  top: 12px;
}

.wrap {
  width: min(calc(100% - 2rem), var(--wrap));
  margin-inline: auto;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.topbar {
  background: var(--navy);
  color: #efe7d8;
  font-size: 0.82rem;
}

.topbar-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(243, 239, 230, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.site-header.is-scrolled {
  box-shadow: 0 8px 24px rgba(21, 34, 56, 0.08);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--navy);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.brand img,
.logo-block img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: cover;
}

.brand small,
.logo-block small {
  display: block;
  font-weight: 500;
  font-size: 0.72rem;
  color: var(--muted);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--navy);
  border-radius: 10px;
  padding: 0.45rem 0.8rem;
  font: inherit;
  cursor: pointer;
}

.nav-panel ul {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-panel a {
  display: inline-block;
  padding: 0.45rem 0.75rem;
  color: var(--ink);
  text-decoration: none;
  border-radius: 999px;
}

.nav-panel a:hover,
.nav-panel a[aria-current="page"] {
  background: #efe6d4;
}

.nav-panel a.cta {
  background: var(--coral);
  color: #fff;
  font-weight: 700;
}

.nav-panel a.cta:hover {
  background: #c73d30;
  color: #fff;
}

.hero {
  padding: 2.4rem 0 1.2rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2rem;
  align-items: center;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  background: #e8f4f1;
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 700;
}

.tag.alt {
  background: #fde8e5;
  color: var(--coral);
}

h1,
h2,
h3 {
  color: var(--navy);
  line-height: 1.25;
  margin: 0 0 0.7rem;
}

h1 {
  font-size: clamp(2.1rem, 4vw, 3.3rem);
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
}

.lead {
  margin: 0 0 1.2rem;
  color: var(--muted);
  font-size: 1.02rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-bottom: 1.4rem;
}

.button,
.button-alt {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.55rem 1.15rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
}

.button {
  background: var(--coral);
  color: #fff;
}

.button:hover {
  background: #c73d30;
  color: #fff;
}

.button-alt {
  background: var(--card);
  color: var(--navy);
  border: 1px solid var(--line);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.7rem;
}

.metric {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.85rem 0.8rem;
  box-shadow: var(--shadow);
}

.metric strong {
  display: block;
  font-size: 1.35rem;
  color: var(--coral);
  line-height: 1.1;
  margin-bottom: 0.3rem;
}

.metric span {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
}

.hero-art {
  position: relative;
  margin: 0;
}

.hero-art img,
.figure img {
  display: block;
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  background: #ddd;
}

.callouts {
  position: absolute;
  left: 12px;
  bottom: 12px;
  display: grid;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.callouts li {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  background: rgba(255, 253, 248, 0.94);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.28rem 0.7rem 0.28rem 0.28rem;
  font-size: 0.78rem;
  color: var(--navy);
}

.callouts span {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--coral);
  color: #fff;
  font-weight: 800;
  font-size: 0.72rem;
}

section {
  padding: 1.6rem 0;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 1rem;
  margin-bottom: 1.1rem;
}

.section-head p {
  max-width: 34rem;
  margin: 0;
  color: var(--muted);
}

.process-sec {
  padding-top: 0.4rem;
}

.process-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 1.1rem 0.4rem 0.4rem;
  position: relative;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.process-bar::before {
  content: "";
  position: absolute;
  left: 8%;
  right: 8%;
  top: 38px;
  height: 4px;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--coral), var(--gold), var(--teal), var(--sky));
}

.process-bar li {
  position: relative;
  z-index: 1;
  text-align: center;
}

.process-bar a {
  display: grid;
  justify-items: center;
  gap: 0.28rem;
  color: inherit;
  text-decoration: none;
  padding: 0 0.4rem 0.7rem;
}

.step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--navy);
  color: #fff;
  font-weight: 800;
  font-size: 0.82rem;
  border: 3px solid var(--card);
}

.process-bar li.is-here .step-num,
.process-bar li[aria-current="step"] .step-num {
  background: var(--coral);
}

.step-name {
  font-weight: 800;
  color: var(--navy);
}

.step-hint {
  font-size: 0.78rem;
  color: var(--muted);
}

.info-mods,
.grid-4,
.grid-3,
.grid-2 {
  display: grid;
  gap: 0.9rem;
}

.info-mods,
.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.info-mod,
.card,
.platform {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem 1rem 1.05rem;
  box-shadow: var(--shadow);
  position: relative;
}

a.info-mod {
  color: inherit;
  text-decoration: none;
}

a.info-mod:hover,
.card:hover,
.platform:hover {
  border-color: #cfc3ad;
}

.ico {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: #eef6f4;
  margin-bottom: 0.7rem;
}

.ico svg {
  width: 28px;
  height: 28px;
  fill: none;
  stroke: var(--teal);
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.mod-kicker,
.kicker {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--coral);
  margin-bottom: 0.35rem;
}

.anno {
  position: absolute;
  top: 12px;
  right: 12px;
  min-width: 32px;
  height: 32px;
  padding: 0 0.4rem;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: var(--navy);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 800;
}

.detail {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 1.6rem;
  align-items: center;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem;
}

.figure {
  margin: 0;
}

.checklist {
  margin: 0 0 1rem;
  padding: 0;
  list-style: none;
}

.checklist li {
  position: relative;
  padding: 0.35rem 0 0.35rem 1.6rem;
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7rem;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 3px;
  background: var(--teal);
}

.page-hero {
  padding-top: 1.8rem;
}

.crumbs {
  margin: 0 0 0.6rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.faq details {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  margin-bottom: 0.7rem;
  padding: 0.2rem 0.9rem;
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--navy);
  padding: 0.75rem 0;
  list-style: none;
}

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

.faq summary::after {
  content: "+";
  float: right;
  color: var(--coral);
  font-size: 1.2rem;
}

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

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

.warn,
.note {
  padding: 0.85rem 1rem;
  border-radius: 12px;
  margin: 1rem 0;
}

.warn {
  background: #fde8e5;
  color: #8a2d24;
}

.note {
  background: #eef6f4;
  color: #1a5c52;
}

footer {
  margin-top: 1.4rem;
  background: var(--navy);
  color: #d9d3c6;
  padding: 2rem 0 1.2rem;
}

footer a {
  color: #f3ead8;
}

footer h3 {
  color: #fff;
  font-size: 0.95rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.8fr 1.1fr;
  gap: 1.2rem;
}

.footer-grid ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-grid li {
  margin-bottom: 0.4rem;
}

.logo-block {
  color: #fff;
  margin-bottom: 0.7rem;
}

.legal {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.4rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.82rem;
}

@media (max-width: 980px) {
  .hero-grid,
  .detail,
  .info-mods,
  .grid-4,
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .process-bar {
    grid-template-columns: 1fr 1fr;
    padding-top: 0.6rem;
  }

  .process-bar::before {
    display: none;
  }

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

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

@media (max-width: 760px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav-panel {
    display: none;
    position: absolute;
    left: 1rem;
    right: 1rem;
    top: calc(100% + 8px);
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: var(--shadow);
    padding: 0.6rem;
  }

  .nav-panel.is-open {
    display: block;
  }

  .nav-panel ul {
    flex-direction: column;
    align-items: stretch;
  }

  .site-header {
    position: sticky;
  }

  .nav {
    position: relative;
  }

  .hero-grid,
  .detail,
  .info-mods,
  .grid-4,
  .grid-3,
  .grid-2,
  .footer-grid,
  .process-bar {
    grid-template-columns: 1fr;
  }

  .topbar-inner,
  .legal {
    flex-direction: column;
  }

  .callouts {
    position: static;
    margin-top: 0.7rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}