@import url('https://fonts.googleapis.com/css2?family=Chakra+Petch:wght@300;400;500;600;700&family=Russo+One&display=swap');

/* ===== 基础变量 ===== */
:root {
  --mint: #5cc6b0;
  --sand: #d4c4a8;
  --forest: #172623;
  --forest-mid: #1f3530;
  --forest-light: #2a4a43;
  --sand-dark: #b8a98a;
  --mint-dark: #3da891;
  --mint-light: #7dd4c2;
  --text-main: #e8dfc8;
  --text-muted: #a09880;
  --text-dark: #172623;
  --radius-card: 18px;
  --radius-pill: 100px;
  --font-head: 'Russo One', 'Chakra Petch', system-ui, sans-serif;
  --font-body: 'Chakra Petch', 'Helvetica Neue', Arial, sans-serif;
  --nav-h: 56px;
  --brand-h: 64px;
  --announce-h: 36px;
  --header-total: calc(var(--announce-h) + var(--brand-h) + var(--nav-h));
  --shadow-soft: 0 4px 24px rgba(23,38,35,0.45);
  --shadow-card: 0 2px 12px rgba(23,38,35,0.35);
  --grain-opacity: 0.06;
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  font-size: 16px;
  background: var(--forest);
  color: var(--text-main);
  scroll-padding-top: calc(var(--header-total) + 16px);
}
body {
  font-family: var(--font-body);
  line-height: 1.65;
  background: var(--forest);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
a { color: var(--mint); text-decoration: none; transition: color 0.2s ease-out; }
a:hover { color: var(--mint-light); }
ul, ol { list-style: none; }
h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.2; }

/* ===== 纹理叠层 ===== */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='0.08'/%3E%3C/svg%3E");
  opacity: var(--grain-opacity);
  mix-blend-mode: overlay;
}

/* ===== 公告条 ===== */
.announce-bar {
  height: var(--announce-h);
  background: var(--mint);
  color: var(--forest);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-align: center;
  padding: 0 1rem;
}

/* ===== 顶部 header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--forest);
  border-bottom: 1px solid var(--forest-light);
  box-shadow: 0 2px 16px rgba(23,38,35,0.6);
}

.brand-row {
  height: var(--brand-h);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 2rem;
  border-bottom: 1px solid var(--forest-light);
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}
.logo-text {
  font-family: var(--font-head);
  font-size: 1.7rem;
  color: var(--mint);
  letter-spacing: 0.04em;
}
.logo-img {
  height: 40px;
  width: auto;
  object-fit: contain;
}

/* ===== 主导航 ===== */
.main-nav {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 1rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.main-nav::-webkit-scrollbar { display: none; }

.main-nav > p {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: nowrap;
  white-space: nowrap;
}

.main-nav > p > a {
  display: inline-flex;
  align-items: center;
  height: 40px;
  padding: 0 1rem;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-main);
  background: transparent;
  border: 1px solid var(--forest-light);
  transition: background 0.2s ease-out, color 0.2s ease-out, border-color 0.2s ease-out;
  letter-spacing: 0.03em;
  white-space: nowrap;
}
.main-nav > p > a:hover,
.main-nav > p > a:focus-visible {
  background: var(--mint);
  color: var(--forest);
  border-color: var(--mint);
}

/* ===== main / wrap ===== */
main {
  position: relative;
  z-index: 1;
  min-height: 60vh;
}
.wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: 220px 1fr;
  grid-template-rows: auto auto;
  grid-template-areas:
    "hero hero"
    "aside content";
  gap: 0 2.5rem;
}

/* ===== HERO ===== */
.hero-section {
  grid-area: hero;
  position: relative;
  height: 100vh;
  min-height: 560px;
  display: flex;
  align-items: stretch;
  overflow: hidden;
  background: var(--forest);
  margin: 0 -1.5rem;
  width: calc(100% + 3rem);
}

.hero-inner {
  position: relative;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 网格底纹 */
.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(92,198,176,0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(92,198,176,0.07) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

/* 双图错位拼贴 */
.hero-collage {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero-img {
  position: absolute;
  object-fit: cover;
  border-radius: var(--radius-card);
}
.hero-img-1 {
  width: 42%;
  height: 65%;
  top: 8%;
  left: 5%;
  transform: rotate(-3deg);
  box-shadow: var(--shadow-soft);
  z-index: 2;
}
.hero-img-2 {
  width: 40%;
  height: 60%;
  bottom: 6%;
  right: 4%;
  transform: rotate(2.5deg);
  box-shadow: var(--shadow-soft);
  z-index: 2;
}
.hero-collage-accent {
  position: absolute;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(92,198,176,0.18) 0%, transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

/* Hero 文案 */
.hero-copy {
  position: relative;
  z-index: 10;
  text-align: center;
  padding: 2rem;
  max-width: 640px;
}
.hero-h1 {
  font-family: var(--font-head);
  font-size: clamp(2.2rem, 6vw, 5rem);
  color: var(--text-main);
  text-shadow: 0 2px 24px rgba(23,38,35,0.8);
  letter-spacing: 0.02em;
  margin-bottom: 1rem;
}
.hero-sub {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--sand);
  margin-bottom: 2rem;
  line-height: 1.6;
}
.hero-cta {
  display: inline-flex;
  align-items: center;
  height: 48px;
  padding: 0 2rem;
  border-radius: var(--radius-pill);
  background: var(--mint);
  color: var(--forest);
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: background 0.2s ease-out, transform 0.2s ease-out;
  box-shadow: 0 4px 20px rgba(92,198,176,0.35);
}
.hero-cta:hover {
  background: var(--mint-dark);
  color: var(--forest);
  transform: translateY(-2px);
}

/* ===== aside ===== */
.site-aside {
  grid-area: aside;
  padding: 3rem 0;
}
.aside-inner {
  background: var(--forest-mid);
  border-radius: var(--radius-card);
  padding: 1.5rem;
  border: 1px solid var(--forest-light);
  position: sticky;
  top: calc(var(--header-total) + 16px);
}
.aside-eyebrow {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--mint);
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}
.aside-title {
  font-family: var(--font-head);
  font-size: 1.05rem;
  color: var(--sand);
  margin-bottom: 1rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--forest-light);
}
.aside-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.aside-nav-list li a {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 0.3rem 0.6rem;
  border-radius: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: background 0.15s ease-out, color 0.15s ease-out;
}
.aside-nav-list li a:hover {
  background: var(--forest-light);
  color: var(--mint);
}

/* ===== 内容区 ===== */
.content-section {
  grid-area: content;
  padding: 3rem 0 4rem;
}
.content-article {
  width: 100%;
}
.page-content {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-main);
}

/* 正文内部元素 */
.page-content h2 {
  font-family: var(--font-head);
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  color: var(--mint);
  margin: 2.5rem 0 1rem;
  padding-top: 0.5rem;
  border-top: 2px solid var(--forest-light);
}
.page-content h3 {
  font-family: var(--font-head);
  font-size: 1.2rem;
  color: var(--sand);
  margin: 1.8rem 0 0.7rem;
}
.page-content p {
  margin-bottom: 1rem;
}
.page-content ul,
.page-content ol {
  list-style: disc;
  margin: 1rem 0 1rem 1.5rem;
}
.page-content li {
  margin-bottom: 0.4rem;
}
.page-content a {
  color: var(--mint);
  border-bottom: 1px solid rgba(92,198,176,0.35);
}
.page-content a:hover {
  color: var(--mint-light);
  border-bottom-color: var(--mint-light);
}
.page-content strong { color: var(--sand); }
.page-content blockquote {
  border-left: 3px solid var(--mint);
  padding: 0.8rem 1.2rem;
  background: var(--forest-mid);
  border-radius: 0 12px 12px 0;
  margin: 1.5rem 0;
  color: var(--sand);
  font-style: italic;
}
.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}
.page-content th {
  background: var(--forest-light);
  color: var(--mint);
  padding: 0.6rem 0.8rem;
  text-align: left;
}
.page-content td {
  padding: 0.55rem 0.8rem;
  border-bottom: 1px solid var(--forest-light);
  color: var(--text-main);
}

/* section 分隔 */
.page-content section {
  padding-top: 2rem;
  margin-bottom: 2rem;
  scroll-margin-top: calc(var(--header-total) + 16px);
}

/* ===== small 眉题 ===== */
small.aside-eyebrow,
small.footer-eyebrow {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--mint);
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--forest-mid);
  border-top: 1px solid var(--forest-light);
  padding: 3rem 0 0;
  position: relative;
  z-index: 1;
}
.footer-top {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem 2.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 2rem;
}
.footer-brand .footer-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.8rem;
  line-height: 1.6;
}
.footer-contact-title,
.footer-nav-title {
  font-family: var(--font-head);
  font-size: 0.95rem;
  color: var(--sand);
  margin-bottom: 0.8rem;
}
.contact-item {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}
.contact-item a {
  color: var(--mint);
}
.contact-item.muted { color: var(--text-muted); }
.footer-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.footer-nav-list li a {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: color 0.15s ease-out;
}
.footer-nav-list li a:hover { color: var(--mint); }

.footer-bottom {
  border-top: 1px solid var(--forest-light);
  padding: 1.2rem 1.5rem;
}
.footer-bottom > nav {
  max-width: 1200px;
  margin: 0 auto;
}
.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  text-align: center;
}
.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}
.footer-note {
  font-size: 0.78rem;
  color: var(--text-muted);
  opacity: 0.75;
}

/* ===== Scroll Reveal 动效 ===== */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.55s ease-out, transform 0.55s ease-out;
  }
  .reveal.visible {
    opacity: 1;
    transform: none;
  }
  .stagger > * {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.4s ease-out, transform 0.4s ease-out;
  }
  .stagger > *.visible {
    opacity: 1;
    transform: none;
  }
  /* hero images */
  .hero-img-1 {
    animation: floatA 8s ease-in-out infinite alternate;
  }
  .hero-img-2 {
    animation: floatB 9s ease-in-out infinite alternate;
  }
  @keyframes floatA {
    from { transform: rotate(-3deg) translateY(0); }
    to   { transform: rotate(-2deg) translateY(-10px); }
  }
  @keyframes floatB {
    from { transform: rotate(2.5deg) translateY(0); }
    to   { transform: rotate(1.5deg) translateY(-8px); }
  }
}
@media (prefers-reduced-motion: reduce) {
  .reveal, .stagger > * { opacity: 1; transform: none; }
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .wrap {
    grid-template-columns: 1fr;
    grid-template-areas:
      "hero"
      "aside"
      "content";
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
  .aside-inner {
    position: static;
  }
}

@media (max-width: 640px) {
  :root {
    --announce-h: 32px;
    --brand-h: 56px;
    --nav-h: 52px;
  }
  .main-nav > p {
    gap: 0.3rem;
  }
  .main-nav > p > a {
    padding: 0 0.65rem;
    font-size: 0.76rem;
    height: 40px;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .hero-img-1 {
    width: 55%;
    height: 45%;
    top: 5%;
    left: 2%;
  }
  .hero-img-2 {
    width: 52%;
    height: 42%;
    bottom: 4%;
    right: 2%;
  }
  .hero-h1 {
    font-size: 2rem;
  }
  .site-aside {
    padding: 1.5rem 0 0;
  }
  .aside-nav-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.25rem;
  }
}

@media (max-width: 375px) {
  .main-nav > p > a {
    padding: 0 0.5rem;
    font-size: 0.72rem;
  }
  .hero-h1 { font-size: 1.75rem; }
}

button[aria-expanded]{min-width:44px;min-height:44px}