:root {
  --color-rock-gray: #7E7F6B;
  --color-moss: #6B8F71;
  --color-terracotta: #A65C3B;
  --color-rice-white: #F2EDE4;
  --color-plateau-blue: #2E5A9C;
  --color-snow-white: #FFFFFF;
  --color-orange: #E8683A;
  --color-ink: #1F1F1F;
  --color-light-gray: #D8D4CC;
  --font-heading: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --container-w: 1200px;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-pill: 999px;
  --shadow-soft: 0 10px 30px rgba(31, 31, 31, 0.08);
  --transition: cubic-bezier(0.4, 0, 0.2, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-ink);
  background-color: var(--color-rice-white);
  background-image:
    linear-gradient(rgba(126, 127, 107, 0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(126, 127, 107, 0.09) 1px, transparent 1px);
  background-size: 36px 36px;
}

body::after {
  content: "";
  position: fixed;
  right: 18px;
  bottom: 22px;
  width: 1px;
  height: 140px;
  background: repeating-linear-gradient(to bottom, rgba(126, 127, 107, 0.5) 0 4px, transparent 4px 8px);
  opacity: 0.35;
  pointer-events: none;
  z-index: 900;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-ink);
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
}

h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
}

h3 {
  font-size: 1.25rem;
}

p {
  margin-bottom: 1em;
}

a {
  color: inherit;
}

a:hover {
  color: var(--color-plateau-blue);
}

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

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul,
ol {
  list-style: none;
}

:focus-visible {
  outline: 3px solid var(--color-orange);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 3000;
  background: var(--color-plateau-blue);
  color: var(--color-snow-white);
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 0.85rem;
  transition: top 0.3s var(--transition);
}

.skip-link:focus {
  top: 16px;
}

.site-header {
  position: fixed;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  width: min(1180px, calc(100vw - 28px));
  background: rgba(242, 237, 228, 0.88);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.75);
  border-radius: 56px;
  box-shadow: var(--shadow-soft);
}

.site-header::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 40px;
  right: 40px;
  height: 2px;
  border-radius: 4px;
  background: linear-gradient(90deg, rgba(46, 90, 156, 0.15) 0%, rgba(232, 104, 58, 0.6) 50%, rgba(46, 90, 156, 0.15) 100%);
  pointer-events: none;
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 10px 12px 10px 14px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-mark {
  position: relative;
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: var(--color-plateau-blue);
  color: var(--color-snow-white);
  font-size: 1.5rem;
  font-weight: 900;
  font-family: var(--font-heading);
  letter-spacing: -0.04em;
  transform: skewX(-8deg);
  box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.18);
}

.brand-mark::after {
  content: "";
  position: absolute;
  right: 6px;
  bottom: 6px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-orange);
}

.brand-text {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--color-plateau-blue);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-list a {
  display: inline-flex;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-ink);
  white-space: nowrap;
  transition: background-color 0.25s var(--transition), color 0.25s var(--transition);
}

.nav-list a:hover {
  background: rgba(46, 90, 156, 0.12);
  color: var(--color-plateau-blue);
}

.nav-list a[aria-current="page"] {
  background: var(--color-plateau-blue);
  color: var(--color-snow-white);
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(46, 90, 156, 0.28);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 9px 18px;
  border-radius: var(--radius-pill);
  background: var(--color-terracotta);
  color: var(--color-snow-white);
  font-size: 0.85rem;
  font-weight: 700;
  white-space: nowrap;
  transform: skewX(-6deg);
  transition: background-color 0.25s var(--transition), transform 0.25s var(--transition);
}

.nav-cta span {
  transform: skewX(6deg);
}

.nav-cta:hover {
  background-color: #8F4C2D;
  transform: skewX(-6deg) translateY(-2px);
  color: var(--color-snow-white);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  margin-left: auto;
  border: 1px solid rgba(126, 127, 107, 0.22);
  border-radius: var(--radius-md);
  background: var(--color-snow-white);
}

.nav-toggle-line {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  border-radius: 2px;
  background: var(--color-plateau-blue);
  transition: transform 0.3s var(--transition), opacity 0.3s var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

#main-content {
  display: block;
  padding-top: clamp(88px, 12vh, 116px);
}

.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: clamp(18px, 4vw, 32px);
}

.section {
  padding-block: 60px;
}

.section + .section {
  padding-top: 0;
}

.section-heading {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 28px;
  margin-bottom: 28px;
}

.section-title {
  position: relative;
  margin: 0;
  padding-left: 20px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.2em;
  bottom: 0.2em;
  width: 5px;
  border-radius: 6px;
  background: linear-gradient(180deg, var(--color-plateau-blue) 0%, var(--color-orange) 100%);
}

.section-desc {
  max-width: 540px;
  margin: 0;
  color: var(--color-rock-gray);
  font-size: 0.9rem;
}

.grid {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

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

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

.grid-asym {
  grid-template-columns: 1.25fr 0.75fr;
}

.topic-strip {
  display: flex;
  gap: 22px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  padding: 4px 4px 18px;
  margin: 0 -4px;
  scrollbar-width: thin;
}

.topic-strip > * {
  flex: 0 0 auto;
  scroll-snap-align: start;
  width: min(380px, 82vw);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border: 2px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
  line-height: 1.4;
  text-align: center;
  cursor: pointer;
  transition: background-color 0.3s var(--transition), color 0.3s var(--transition), border-color 0.3s var(--transition), transform 0.25s var(--transition), box-shadow 0.3s var(--transition);
}

.btn-primary {
  background-color: var(--color-terracotta);
  color: var(--color-snow-white);
}

.btn-primary:hover {
  background-color: #8E4A2D;
  color: var(--color-snow-white);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(166, 92, 59, 0.25);
}

.btn-ghost {
  border-color: var(--color-plateau-blue);
  color: var(--color-plateau-blue);
  background: transparent;
}

.btn-ghost:hover {
  background: rgba(46, 90, 156, 0.08);
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background: rgba(107, 143, 113, 0.14);
  color: var(--color-moss);
  font-size: 0.75rem;
  font-weight: 650;
}

.pill[data-tone="blue"] {
  background: rgba(46, 90, 156, 0.12);
  color: var(--color-plateau-blue);
}

.pill[data-tone="orange"] {
  background: rgba(232, 104, 58, 0.12);
  color: var(--color-orange);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 20px 0;
  font-size: 0.84rem;
  color: var(--color-rock-gray);
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "//";
  margin-right: 10px;
  opacity: 0.5;
}

.breadcrumb a {
  color: var(--color-plateau-blue);
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb [aria-current="page"] {
  color: var(--color-rock-gray);
  font-weight: 700;
}

.image-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: var(--ratio, 4 / 3);
  background: var(--color-light-gray);
  border-radius: 18px;
}

.image-frame::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-plateau-blue) 0 76%, var(--color-orange) 76%);
  pointer-events: none;
}

.image-frame img,
.image-frame > * {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.coordinate-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-rock-gray);
}

.coordinate-tag::before {
  content: "✦";
  color: var(--color-orange);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-plateau-blue), var(--color-orange));
  z-index: 1500;
  pointer-events: none;
}

.scroll-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 1200;
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--color-plateau-blue);
  color: var(--color-snow-white);
  box-shadow: 0 10px 24px rgba(31, 31, 31, 0.2);
  font-size: 1.2rem;
  opacity: 0;
  pointer-events: none;
  transform: translateY(14px);
  transition: opacity 0.3s var(--transition), transform 0.3s var(--transition), background-color 0.3s var(--transition);
}

.scroll-top:hover {
  background: var(--color-orange);
}

.scroll-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}

.site-footer {
  position: relative;
  margin-top: 90px;
  background: linear-gradient(160deg, var(--color-plateau-blue) 0%, #24507F 100%);
  color: rgba(255, 255, 255, 0.82);
  border-radius: 36px 36px 0 0;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-orange) 0%, var(--color-terracotta) 24%, var(--color-moss) 60%, rgba(255, 255, 255, 0.3) 100%);
}

.footer-inner {
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: clamp(18px, 4vw, 32px);
}

.footer-main {
  display: grid;
  grid-template-columns: 2fr 1.2fr 1fr 1.4fr;
  gap: clamp(28px, 4vw, 48px);
  padding-block: 64px 44px;
}

.footer-brand {
  max-width: 420px;
}

.footer-logo .brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  font-size: 1.25rem;
}

.footer-logo .brand-text {
  color: var(--color-snow-white);
}

.footer-description {
  margin: 18px 0 12px;
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.7);
}

.footer-trust {
  margin-top: 16px;
  padding-left: 12px;
  border-left: 3px solid var(--color-orange);
  font-size: 0.78rem;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.55);
}

.footer-heading {
  display: flex;
  align-items: center;
  margin-bottom: 16px;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-snow-white);
}

.footer-heading::before {
  content: "//";
  color: var(--color-orange);
  font-weight: 800;
  margin-right: 8px;
}

.footer-list li + li {
  margin-top: 10px;
}

.footer-list a {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.9rem;
  transition: color 0.25s var(--transition), padding-left 0.25s var(--transition);
}

.footer-list a:hover {
  color: var(--color-snow-white);
  padding-left: 5px;
}

.footer-contact-list li {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.72);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  padding-block: 24px 30px;
  font-size: 0.85rem;
}

.footer-copyright {
  margin: 0;
  color: rgba(255, 255, 255, 0.72);
}

.footer-bottom-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

.footer-bottom-links a {
  color: rgba(255, 255, 255, 0.72);
}

.footer-bottom-links a:hover {
  color: var(--color-snow-white);
}

.footer-icp {
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.04em;
}

@media (max-width: 960px) {
  .site-header {
    top: 8px;
    width: calc(100vw - 16px);
    border-radius: var(--radius-lg);
  }

  .header-inner {
    flex-wrap: wrap;
    padding: 8px;
  }

  .header-nav {
    order: 3;
    flex-basis: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transform: translateY(6px);
    visibility: hidden;
    transition: max-height 0.38s var(--transition), opacity 0.3s ease, transform 0.3s ease, visibility 0s linear 0.42s;
  }

  .header-nav[data-open] {
    max-height: 520px;
    opacity: 1;
    transform: none;
    visibility: visible;
    padding-top: 10px;
    border-top: 1px solid rgba(46, 90, 156, 0.12);
    transition: max-height 0.38s var(--transition), opacity 0.3s ease, transform 0.3s ease, visibility 0s;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .nav-list a {
    justify-content: center;
    padding: 12px 16px;
  }

  .nav-cta {
    justify-content: center;
    text-align: center;
  }

  .nav-toggle {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }

  .footer-main {
    grid-template-columns: 1fr 1fr;
    gap: 32px 24px;
    padding-top: 48px;
  }
}

@media (max-width: 560px) {
  .footer-main {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .scroll-progress {
    display: none;
  }

  .scroll-top {
    display: none;
  }
}