:root {
  --kiwi: #7BC043;
  --kiwi-deep: #4A7C23;
  --mint: #D3F2E5;
  --navy: #1F3A93;
  --orange: #FF8C00;
  --ink: #2D2D2D;
  --bg: #F5F7FA;
  --white: #FFFFFF;
  --tint-kiwi: rgba(123, 192, 67, 0.15);
  --tint-navy: rgba(31, 58, 147, 0.1);
  --heading-font: "Poppins", "PingFang SC", "Microsoft YaHei", sans-serif;
  --body-font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --base-size: 16px;
  --scale: 1.25;
  --line-height: 1.6;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  --border-thick: 3px;
}

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

html {
  scroll-behavior: smooth;
}

body,
h1,
h2,
h3,
h4,
p,
ul,
ol,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

ul,
ol {
  padding: 0;
}

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

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

address {
  font-style: normal;
}

a {
  color: inherit;
}

body {
  font-family: var(--body-font);
  font-size: var(--base-size);
  line-height: var(--line-height);
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  font-family: var(--heading-font);
  font-weight: 700;
  line-height: 1.2;
  color: var(--navy);
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

h3 {
  font-size: 1.35rem;
}

::selection {
  background: var(--kiwi);
  color: var(--white);
}

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

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

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 300;
  padding: 0.6em 1.2em;
  background: var(--orange);
  color: var(--white);
  font-weight: 600;
  text-decoration: none;
  border-radius: 8px;
  transform: translateY(-200%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

#main-content {
  scroll-margin-top: 88px;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 72px;
  background: transparent;
  transition: background 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.site-header[data-scrolled="true"] {
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  border-bottom: 1px solid var(--tint-navy);
}

.header-shell {
  max-width: 1200px;
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-mark {
  position: relative;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--mint);
  border: 2px solid var(--navy);
  transition: transform 0.2s ease;
}

.brand:hover .brand-mark {
  transform: rotate(15deg);
}

.brand-mark-core {
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #fff 0%, var(--mint) 35%, var(--kiwi) 80%);
}

.brand-mark-core::after {
  content: "";
  position: absolute;
  inset: 6px;
  border-radius: 50%;
  border: 1px dashed var(--kiwi-deep);
}

.brand-seed {
  position: absolute;
  left: 11px;
  top: 10px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--ink);
  box-shadow:
    6px 5px 0 var(--ink),
    -5px 6px 0 var(--ink),
    -5px -3px 0 var(--ink),
    6px -3px 0 var(--ink);
  z-index: 1;
}

.brand-name {
  display: flex;
  flex-direction: column;
  font-family: var(--heading-font);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.1;
  color: var(--navy);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.brand-name strong {
  color: var(--kiwi-deep);
}

.brand-name small {
  font-size: 0.55rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--navy);
}

.nav {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
}

.nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.55em 0.75em;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--navy);
  text-decoration: none;
  border-radius: 8px;
  transition: color 0.2s ease, background 0.2s ease;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 12%;
  right: 12%;
  bottom: 4px;
  height: 3px;
  background: var(--kiwi);
  border-radius: 99px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--kiwi-deep);
  background: var(--tint-kiwi);
}

.nav a:hover::after,
.nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.nav-search {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0.45em 1em;
  border: 2px solid var(--navy);
  border-radius: 999px;
  color: var(--navy);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.nav-search:hover {
  background: var(--navy);
  color: var(--white);
  transform: translateY(-2px);
}

.nav-search .ico {
  width: 15px;
  height: 15px;
}

.search-label {
  line-height: 1;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 2px solid var(--navy);
  border-radius: 12px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.nav-toggle:hover {
  background: var(--mint);
}

.toggle-line {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--navy);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.header-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 3px;
  width: 0;
  background: var(--orange);
  z-index: 2;
  transition: width 0.1s linear;
}

.menu-open {
  overflow: hidden;
}

.container {
  width: min(1160px, 100% - 48px);
  margin-inline: auto;
}

.section {
  padding: clamp(3rem, 8vw, 6rem) 0;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  font-size: 0.9rem;
  color: var(--ink);
  margin-bottom: 24px;
}

.breadcrumbs a {
  color: var(--navy);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease;
}

.breadcrumbs a:hover {
  border-color: var(--kiwi);
}

.breadcrumbs [aria-current="page"] {
  color: var(--kiwi-deep);
  font-weight: 700;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.75em 1.4em;
  font-family: var(--body-font);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.2;
  border: 2px solid var(--ink);
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.btn:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.btn:active {
  transform: translateY(0);
  box-shadow: none;
}

.btn-primary {
  background: var(--orange);
  color: var(--white);
  box-shadow: 4px 4px 0 var(--ink);
}

.btn-primary:hover {
  background: #F27D00;
}

.btn-secondary {
  background: var(--kiwi);
  color: var(--white);
  box-shadow: 4px 4px 0 var(--ink);
}

.btn-secondary:hover {
  background: var(--kiwi-deep);
}

.btn-ghost {
  background: transparent;
  color: var(--navy);
}

.btn-ghost:hover {
  background: var(--mint);
}

.kcard {
  background: var(--white);
  border: 2px solid var(--tint-navy);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 24px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.kcard:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.12);
}

.kcard--mint {
  background: var(--mint);
}

.kcard--dark {
  background: var(--navy);
  color: var(--white);
}

.bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 20px;
}

.bento-item {
  grid-column: span 6;
  min-height: 220px;
  border: 2px solid var(--ink);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 24px;
  background: var(--white);
}

.bento-item--span-3 { grid-column: span 3; }
.bento-item--span-4 { grid-column: span 4; }
.bento-item--span-5 { grid-column: span 5; }
.bento-item--span-7 { grid-column: span 7; }
.bento-item--span-8 { grid-column: span 8; }
.bento-item--span-12 { grid-column: span 12; }

.chapter {
  display: flex;
  align-items: center;
  gap: 14px;
}

.chapter-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.6em;
  padding: 0.05em 0.2em;
  font-family: var(--heading-font);
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 700;
  line-height: 1;
  color: var(--kiwi);
  -webkit-text-stroke: 2px var(--kiwi-deep);
  background: var(--mint);
  border: 2px solid var(--ink);
  border-radius: 10px;
}

.grid {
  display: grid;
  gap: 24px;
}

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

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

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

.visual-frame {
  position: relative;
  display: block;
  aspect-ratio: 4 / 3;
  border: 3px solid var(--navy);
  border-radius: 18px;
  background:
    radial-gradient(circle at 20% 80%, var(--tint-kiwi), transparent 42%),
    linear-gradient(135deg, var(--mint), var(--white));
  box-shadow: var(--shadow);
  overflow: hidden;
  min-height: 120px;
}

.visual-frame::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px dashed var(--kiwi-deep);
  border-radius: 14px;
  pointer-events: none;
}

.visual-frame--tall {
  aspect-ratio: 3 / 4;
}

.visual-frame--wide {
  aspect-ratio: 16 / 9;
}

.visual-frame--round {
  aspect-ratio: 1;
  border-radius: 50%;
}

.visual-frame--round::after {
  border-radius: 50%;
}

.site-footer {
  background: var(--navy);
  color: rgba(255, 255, 255, 0.85);
  border-top: 4px solid var(--kiwi);
}

.site-footer a {
  color: rgba(255, 255, 255, 0.95);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.25);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.site-footer a:hover {
  color: var(--kiwi);
  border-color: var(--kiwi);
}

.footer-shell {
  width: min(1160px, 100% - 48px);
  margin-inline: auto;
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
}

.footer-brand-block {
  padding-right: 8px;
}

.footer-brand {
  font-family: var(--heading-font);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
}

.footer-brand strong {
  color: var(--kiwi);
}

.footer-tagline {
  margin-top: 8px;
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.85);
}

.footer-trust {
  margin-top: 16px;
  font-size: 0.85rem;
  line-height: 1.6;
  border-left: 3px solid var(--orange);
  padding-left: 14px;
  opacity: 0.8;
}

.footer-title {
  font-family: var(--heading-font);
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.08em;
  margin-bottom: 16px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--kiwi);
}

.footer-links {
  list-style: none;
  display: grid;
  gap: 8px;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 2px 0;
}

.footer-links a::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--kiwi);
  flex-shrink: 0;
}

.footer-contact p {
  margin: 0 0 8px;
  line-height: 1.5;
}

.footer-bottom {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  opacity: 0.75;
}

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand-block {
    grid-column: span 2;
  }

  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .bento-item--span-3,
  .bento-item--span-4,
  .bento-item--span-5,
  .bento-item--span-7,
  .bento-item--span-8 {
    grid-column: span 6;
  }
}

@media (max-width: 900px) {
  .site-header {
    height: 60px;
  }

  .header-shell {
    padding: 0 16px;
    gap: 12px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(80vw, 300px);
    max-width: 100%;
    margin: 0;
    padding: 84px 28px 32px;
    background: var(--white);
    border-left: 3px solid var(--kiwi);
    box-shadow: -12px 0 30px rgba(0, 0, 0, 0.12);
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    transform: translateX(100%);
    visibility: hidden;
    transition: transform 0.3s ease, visibility 0.3s ease;
  }

  .nav[data-open="true"] {
    transform: translateX(0);
    visibility: visible;
  }

  .nav a {
    width: 100%;
    font-size: 1.05rem;
    padding: 0.9rem 0.5rem;
    border-bottom: 1px solid var(--mint);
  }

  .nav a::after {
    display: none;
  }

  .grid--3,
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .container {
    width: min(100% - 32px, 1160px);
  }

  .footer-shell {
    padding-top: 48px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-brand-block {
    grid-column: span 1;
  }

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

  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }

  .bento-item,
  .bento-item--span-3,
  .bento-item--span-4,
  .bento-item--span-5,
  .bento-item--span-7,
  .bento-item--span-8,
  .bento-item--span-12 {
    grid-column: span 12;
    min-height: 180px;
  }

  .nav-search {
    width: 38px;
    padding: 0.45em;
    justify-content: center;
  }

  .nav-search .search-label {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}