:root {
  --bg: #f3fbff;
  --ink: #0e3a56;
  --muted: #3e7390;
  --line: rgba(18, 120, 176, 0.16);
  --sky: #3cb4ef;
  --sky-deep: #1278b8;
  --cloud: #ffffff;
  --header: 76px;
  color-scheme: light;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(980px 420px at 86% -12%, rgba(90, 190, 236, 0.55), transparent 64%),
    linear-gradient(180deg, #8ecff2 0%, #d7f1fb 16%, var(--bg) 42%, #f7fcff 100%);
  color: var(--ink);
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

::selection {
  background: #b7e6f8;
  color: #0e3a56;
}

img {
  max-width: 100%;
  display: block;
}

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

button,
input,
textarea {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 1px solid var(--sky);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: 16px;
  top: -40px;
  padding: 8px 12px;
  background: var(--sky);
  color: #fff;
  z-index: 40;
}

.skip:focus {
  top: 12px;
}

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header);
  padding: 0 4vw;
  background: linear-gradient(to bottom, rgba(142, 207, 242, 0.72), rgba(142, 207, 242, 0));
}

.site-header.is-solid {
  background: rgba(226, 244, 252, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  letter-spacing: 0.22em;
  font-size: 14px;
}

.brand svg {
  width: 22px;
  height: 22px;
  color: var(--sky);
}

.site-nav {
  display: flex;
  gap: 28px;
  font-size: 14px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.site-nav a[aria-current="page"] {
  color: var(--ink);
}

.site-nav a:hover {
  color: var(--sky-deep);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
}

.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block;
  width: 16px;
  height: 1px;
  margin: 0 auto;
  background: var(--ink);
  position: relative;
}

.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle span::before { top: -5px; }
.nav-toggle span::after { top: 5px; }

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: flex-end;
  padding: calc(var(--header) + 8vh) 4vw 12vh;
  overflow: hidden;
}

.hero-media,
.band-media {
  position: absolute;
  inset: 0;
}

.hero-media img,
.band-media img,
.frame img,
.chapter-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-media img {
  object-position: center 58%;
}

.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to top, rgba(243, 251, 255, 0.94) 0%, rgba(243, 251, 255, 0.2) 46%, rgba(142, 207, 242, 0.05) 100%);
}

.hero-copy,
.band-copy {
  position: relative;
  z-index: 1;
  max-width: 920px;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--sky-deep);
  font-size: 12px;
  letter-spacing: 0.42em;
}

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

h1 {
  margin-bottom: 18px;
  font-size: clamp(3.4rem, 9vw, 7.4rem);
  font-weight: 500;
  line-height: 1.02;
  letter-spacing: 0.16em;
}

.lede {
  max-width: 16em;
  margin-bottom: 32px;
  font-size: clamp(1.15rem, 2vw, 1.45rem);
  line-height: 1.6;
  color: #2b6282;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid var(--sky);
  color: #fff;
  background: var(--sky);
  letter-spacing: 0.14em;
  font-size: 14px;
}

.btn.ghost {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.55);
  border-color: rgba(14, 58, 86, 0.18);
}

.btn:hover {
  background: var(--sky-deep);
  border-color: var(--sky-deep);
  transform: translateY(-1px);
}

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

.glyphs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.45);
}

.glyph {
  padding: 54px 28px 60px;
  border-right: 1px solid var(--line);
}

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

.glyph strong {
  display: block;
  margin-bottom: 10px;
  color: var(--sky-deep);
  font-size: clamp(2.2rem, 4vw, 3.6rem);
  font-weight: 500;
  letter-spacing: 0.12em;
}

.glyph span {
  color: var(--muted);
}

.chapter {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  min-height: 78vh;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.35);
}

.chapter.is-flip .chapter-media {
  order: 2;
}

.chapter-media {
  min-height: 460px;
  background: #d4eefb;
}

.chapter-copy {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 8vh 5vw 9vh;
}

.index-no {
  margin-bottom: 16px;
  color: var(--sky);
  letter-spacing: 0.28em;
  font-size: 12px;
}

.chapter h2,
.panel h2,
.page-intro h1 {
  margin-bottom: 14px;
  font-size: clamp(2rem, 4vw, 3.4rem);
  font-weight: 500;
  letter-spacing: 0.14em;
}

.chapter p:last-child,
.narrow p {
  color: var(--muted);
  font-size: 17px;
}

.band {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: flex-end;
  padding: 12vh 4vw;
  overflow: hidden;
}

.band-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(243, 251, 255, 0.92) 0%, rgba(184, 224, 244, 0.12) 72%);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 28px 4vw 36px;
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.12em;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.4);
}

.site-footer .icp {
  letter-spacing: 0.04em;
}

.site-footer .icp:hover {
  color: var(--sky-deep);
}

.page {
  padding-top: var(--header);
}

.page-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: end;
  padding: 10vh 4vw 8vh;
  border-bottom: 1px solid var(--line);
}

.page-intro p {
  margin: 0;
  color: var(--muted);
  font-size: 18px;
}

.frame {
  min-height: 520px;
  background: #d4eefb;
}

.frame.short {
  min-height: 360px;
}

.split {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.4);
}

.narrow {
  padding: 8vh 6vw;
}

.narrow h2 {
  margin-bottom: 18px;
  font-size: 2rem;
  font-weight: 500;
  letter-spacing: 0.12em;
}

.principles {
  display: grid;
}

.principle {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 18px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
}

.principle:last-child {
  border-bottom: 1px solid var(--line);
}

.principle b {
  color: var(--sky-deep);
  font-weight: 500;
  letter-spacing: 0.16em;
}

.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  padding: 6vh 4vw 8vh;
}

.card {
  border: 1px solid var(--line);
  background: #fff;
}

.card img {
  height: 280px;
  width: 100%;
  object-fit: cover;
}

.card div {
  padding: 24px 24px 28px;
}

.card h2 {
  margin-bottom: 8px;
  font-size: 1.6rem;
  font-weight: 500;
  letter-spacing: 0.12em;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.contact-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  min-height: calc(100vh - var(--header));
}

.contact-side {
  padding: 8vh 4vw;
  border-right: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.4);
}

.facts {
  margin: 36px 0 0;
  padding: 0;
  list-style: none;
}

.facts li {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 12px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.facts span {
  color: var(--muted);
  letter-spacing: 0.12em;
}

.contact-form {
  padding: 8vh 5vw;
  background: rgba(255, 255, 255, 0.55);
}

label {
  display: block;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.16em;
}

input,
textarea {
  display: block;
  width: 100%;
  margin-top: 8px;
  padding: 12px 0;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  letter-spacing: 0;
}

textarea {
  min-height: 120px;
  resize: vertical;
}

.form-note {
  min-height: 1.5em;
  color: var(--sky-deep);
  font-size: 14px;
}

.hint {
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 900px) {
  .nav-toggle {
    display: grid;
    place-items: center;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: var(--header);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 8px 6vw 20px;
    background: rgba(226, 244, 252, 0.98);
    border-bottom: 1px solid var(--line);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 14px 0;
    border-top: 1px solid var(--line);
  }

  .glyphs,
  .chapter,
  .chapter.is-flip,
  .page-intro,
  .split,
  .cards,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .chapter.is-flip .chapter-media {
    order: 0;
  }

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

  .contact-side {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  h1 {
    letter-spacing: 0.08em;
  }

  .site-footer {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn:hover { transform: none; }
}