/* ============================================
   无极山 Bama Spring — 全局样式
   主色：纯净白 + 深邃青绿 | 点缀：金
   ============================================ */

:root {
  --color-white: #ffffff;
  --color-cream: #f7f8f5;
  --color-cream-2: #eef1ec;
  --color-green-deep: #3d5247;
  --color-green-mid: #4a5d4e;
  --color-green-light: #5c7264;
  --color-gold: #c5a059;
  --color-gold-soft: rgba(197, 160, 89, 0.35);
  --color-text: #1c211d;
  --color-text-muted: #5a635a;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", serif;
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --type-display-weight: 800;
  --type-head-weight: 700;
  --shadow-soft: 0 18px 50px rgba(45, 58, 49, 0.12);
  --radius: 12px;
  --radius-lg: 20px;
  --header-h: 72px;
  --transition: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-cream);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  vertical-align: middle;
}

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

strong {
  color: var(--color-green-mid);
  font-weight: 600;
}

h1,
h2,
h3,
.section-title,
.hero-title {
  font-family: var(--font-serif);
  font-weight: var(--type-head-weight);
  letter-spacing: 0.06em;
}

.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;
}

.container {
  width: min(1120px, 92vw);
  margin-inline: auto;
}

.container.narrow {
  width: min(820px, 92vw);
}

/* ========== 山形装饰（页眉下沿 subtle） ========== */
body::before {
  content: "";
  position: fixed;
  inset: auto 0 0 0;
  height: 120px;
  pointer-events: none;
  z-index: 0;
  opacity: 0.04;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 120'%3E%3Cpath fill='%234a5d4e' d='M0 120L0 80L180 40L360 70L540 30L720 55L900 25L1080 50L1260 35L1440 60L1440 120Z'/%3E%3C/svg%3E")
    repeat-x bottom;
  background-size: 1440px 120px;
}

/* ========== 导航 ========== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  transition: background var(--transition), box-shadow var(--transition), backdrop-filter var(--transition);
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 4px 30px rgba(45, 58, 49, 0.08);
}

.site-header.is-scrolled .logo-mark,
.site-header.is-scrolled .logo-sub,
.site-header.is-scrolled .nav-list a {
  color: var(--color-green-deep);
}

.site-header.is-scrolled .nav-toggle-bar {
  background: var(--color-green-deep);
}

.header-inner {
  height: 100%;
  width: min(1200px, 94vw);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-width: 0;
}

.logo {
  display: flex;
  flex-direction: column;
  gap: 0;
  line-height: 1.15;
}

.logo-img {
  display: block;
  height: auto;
  max-width: 100%;
}

.logo-img--header {
  height: clamp(34px, 3.6vw, 44px);
  width: auto;
  max-width: min(220px, 36vw);
  filter: drop-shadow(0 2px 16px rgba(0, 0, 0, 0.22));
}

.logo-img--header-dark {
  display: none;
}

.site-header.is-scrolled .logo-img--header {
  filter: none;
}

.site-header.is-scrolled .logo-img--header-light {
  display: none;
}

.site-header.is-scrolled .logo-img--header-dark {
  display: block;
}

.logo-img--footer {
  width: auto;
  height: auto;
  max-height: clamp(40px, 4.2vw, 56px);
  max-width: min(260px, 70%);
}

@media (max-width: 480px) {
  .logo-img--header {
    height: 32px;
    max-width: 46vw;
  }

  .logo-img--footer {
    max-height: 44px;
    max-width: 78%;
  }
}

.logo-mark {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: 0.2em;
  color: var(--color-white);
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.28);
  transition: color var(--transition), text-shadow var(--transition);
}

.logo-sub {
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.38em;
  color: var(--color-gold);
  transition: color var(--transition);
}

.site-header.is-scrolled .logo-sub {
  color: var(--color-gold);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.25rem;
}

.nav-list a {
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.92);
  padding: 0.35rem 0;
  position: relative;
  transition: color var(--transition);
}

.site-header:not(.is-scrolled) .nav-list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--color-gold);
  transition: width var(--transition);
}

.site-header:not(.is-scrolled) .nav-list a:hover::after {
  width: 100%;
}

.site-header.is-scrolled .nav-list a:hover {
  color: var(--color-gold);
}

.btn-nav {
  padding: 0.55rem 1.15rem;
  font-size: 0.85rem;
  border-radius: 999px;
  background: var(--color-gold);
  color: var(--color-green-deep);
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  white-space: nowrap;
}

.btn-nav:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--color-gold-soft);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  z-index: 1002;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s, background 0.3s;
  margin-inline: auto;
}

.site-header.is-scrolled .nav-toggle.is-open .nav-toggle-bar {
  background: var(--color-green-deep);
}

.nav-toggle.is-open .nav-toggle-bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.nav-toggle.is-open .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-open .nav-toggle-bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.75rem;
  font-family: var(--font-sans);
  font-size: 0.98rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
}

.btn-primary {
  background: var(--color-gold);
  color: var(--color-green-deep);
  box-shadow: 0 10px 30px var(--color-gold-soft);
}

.btn-primary:hover {
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.55);
}

.btn-outline:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
}

.btn-outline-light {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.5);
}

.btn-outline-light:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
}

/* ========== Hero ========== */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--header-h) + 2rem) 1.5rem 4rem;
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-color: var(--color-green-deep);
}

.hero-media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  min-width: 100%;
  min-height: 100%;
  object-fit: cover;
  object-position: center center;
  transform: scale(1.02);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(
    160deg,
    rgba(45, 62, 52, 0.75) 0%,
    rgba(61, 82, 71, 0.55) 45%,
    rgba(30, 42, 36, 0.65) 100%
  );
}

/* 水波纹氛围 */
.hero-waves {
  position: absolute;
  inset: 0;
  z-index: 2;
  opacity: 0.12;
  background: repeating-radial-gradient(
    circle at 50% 120%,
    transparent 0,
    transparent 48px,
    rgba(255, 255, 255, 0.06) 49px,
    rgba(255, 255, 255, 0.06) 50px
  );
  animation: wave-drift 14s ease-in-out infinite;
}

@keyframes wave-drift {
  0%,
  100% {
    transform: translateY(0) scale(1);
  }
  50% {
    transform: translateY(-12px) scale(1.02);
  }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 720px;
  color: var(--color-white);
}

.hero-eyebrow {
  font-family: var(--font-serif);
  font-size: 1rem;
  letter-spacing: 0.28em;
  color: var(--color-gold);
  margin-bottom: 1.25rem;
  font-weight: 600;
}

.hero-title {
  margin: 0 0 1rem;
  line-height: 1.12;
  font-weight: var(--type-display-weight);
}

.hero-title-cn {
  display: block;
  font-size: clamp(3rem, 8.5vw, 4.75rem);
  font-weight: 900;
  letter-spacing: 0.26em;
  text-indent: 0.26em;
}

.hero-title-en {
  display: block;
  font-size: clamp(1.05rem, 2.4vw, 1.5rem);
  font-weight: 300;
  letter-spacing: 0.48em;
  text-transform: uppercase;
  font-family: var(--font-sans);
  opacity: 0.9;
  margin-top: 0.65rem;
}

.hero-tagline {
  font-family: var(--font-serif);
  font-size: clamp(1.2rem, 2.8vw, 1.65rem);
  font-weight: 700;
  color: rgba(255, 255, 255, 0.9);
  margin: 0 0 2rem;
  letter-spacing: 0.42em;
  text-indent: 0.42em;
}

.hero-points {
  list-style: none;
  padding: 0;
  margin: 0 0 2rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem 1.5rem;
  font-size: 0.92rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.86);
}

.hero-points li {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.hero-points i {
  color: var(--color-gold);
  font-size: 0.9rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

/* ========== 通用板块 ========== */
.section {
  position: relative;
  padding: clamp(3.6rem, 9vw, 6rem) 0;
  z-index: 1;
}

.section-source,
.section-products {
  background: var(--color-white);
}

.section-minerals {
  background: linear-gradient(180deg, var(--color-cream-2) 0%, var(--color-cream) 100%);
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto clamp(2.2rem, 4vw, 2.7rem);
}

.section-head.light {
  color: var(--color-white);
}

.section-head.light .section-desc {
  color: rgba(255, 255, 255, 0.88);
}

.section-head.light strong {
  color: var(--color-gold);
}

.section-label {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: clamp(0.95rem, 1.35vw + 0.72rem, 1.2rem);
  letter-spacing: 0.38em;
  color: var(--color-gold);
  margin-bottom: clamp(0.65rem, 1.5vw, 1rem);
  font-weight: 700;
  line-height: 1.5;
}

/* 居中大标题：字距略收紧，避免折行零碎 */
.section-head .section-label {
  letter-spacing: 0.32em;
  padding-inline: 0.25em;
}

.section-head.light .section-label {
  color: var(--color-gold);
}

/* 双栏左文：标签与正文对齐 */
.split-text .section-label {
  font-size: clamp(1rem, 1.25vw + 0.78rem, 1.18rem);
  letter-spacing: 0.36em;
}

.section-title {
  font-size: clamp(2rem, 4.8vw, 2.85rem);
  font-weight: 800;
  margin: 0 0 0.85rem;
  color: var(--color-green-deep);
  letter-spacing: 0.14em;
  line-height: 1.25;
}

.section-head.light .section-title {
  color: var(--color-white);
}

.section-desc {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 1.02rem;
  font-weight: 400;
  line-height: 1.8;
  letter-spacing: 0.02em;
}

.lead {
  font-size: 1.14rem;
  font-weight: 400;
  line-height: 1.85;
  letter-spacing: 0.03em;
  color: var(--color-text);
}

/* 双栏 */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.split-reverse {
  direction: rtl;
}

.split-reverse > * {
  direction: ltr;
}

.split-text p {
  margin: 0 0 1rem;
}

.media-frame {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  position: relative;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  box-shadow: inset 0 0 0 1px rgba(197, 160, 89, 0.2);
}

.media-frame--portrait img {
  width: 100%;
  min-height: 420px;
  max-height: 640px;
  object-fit: cover;
  object-position: center 30%;
}

.icon-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
}

.icon-list li {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.65rem;
  color: var(--color-text-muted);
}

.icon-list i {
  color: var(--color-gold);
  width: 1.1rem;
}

/* ========== 实景掠影 · 轮播（水源地板块下方） ========== */
.container--wide {
  width: min(1280px, 94vw);
}

.section-showcase {
  background: var(--color-white);
}

.section-showcase .source-showcase {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.source-showcase-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 1.75rem;
}

.source-showcase-head .section-label {
  margin-bottom: 0.65rem;
}

.source-showcase-title {
  font-family: var(--font-serif);
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--color-green-deep);
  margin: 0 0 0.65rem;
  line-height: 1.35;
}

.source-showcase-desc {
  margin: 0;
  font-size: 0.98rem;
  color: var(--color-text-muted);
  line-height: 1.75;
}

.carousel {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(197, 160, 89, 0.28);
  background: var(--color-green-deep);
}

.carousel-viewport {
  overflow: hidden;
  aspect-ratio: 21 / 9;
  touch-action: pan-y pinch-zoom;
}

@media (max-width: 768px) {
  .carousel-viewport {
    aspect-ratio: 4 / 3;
  }
}

.carousel-track {
  display: flex;
  height: 100%;
  transition: transform 0.55s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: transform;
}

.carousel.is-reduced-motion .carousel-track {
  transition: none;
}

.carousel-slide {
  position: relative;
  flex: 0 0 100%;
  height: 100%;
  margin: 0;
}

.carousel-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}

.carousel-caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 1.5rem 1.25rem 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.45rem;
  background: linear-gradient(180deg, transparent 0%, rgba(28, 38, 32, 0.82) 65%);
  color: var(--color-white);
}

.carousel-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.carousel-tag i {
  font-size: 0.85rem;
  opacity: 0.95;
}

.carousel-tag--plant {
  background: rgba(197, 160, 89, 0.25);
  border: 1px solid rgba(197, 160, 89, 0.65);
  color: var(--color-gold);
}

.carousel-tag--scenic {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: rgba(255, 255, 255, 0.95);
}

.carousel-caption-text {
  font-size: 0.88rem;
  line-height: 1.5;
  opacity: 0.92;
  max-width: 36rem;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid rgba(197, 160, 89, 0.55);
  background: rgba(255, 255, 255, 0.12);
  color: var(--color-white);
  backdrop-filter: blur(8px);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  z-index: 2;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.carousel-btn:hover {
  background: rgba(197, 160, 89, 0.28);
  border-color: var(--color-gold);
  color: var(--color-white);
}

.carousel-btn:active {
  transform: translateY(-50%) scale(0.96);
}

.carousel-btn--prev {
  left: clamp(0.5rem, 2vw, 1rem);
}

.carousel-btn--next {
  right: clamp(0.5rem, 2vw, 1rem);
}

.carousel-dots {
  position: absolute;
  bottom: 0.85rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0.5rem;
  z-index: 2;
  padding: 0.35rem 0.6rem;
  border-radius: 999px;
  background: rgba(28, 38, 32, 0.45);
  backdrop-filter: blur(6px);
}

.carousel-dot {
  width: 8px;
  height: 8px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
  cursor: pointer;
  transition: transform 0.2s, background 0.2s;
}

.carousel-dot[aria-selected="true"] {
  background: var(--color-gold);
  transform: scale(1.2);
}

.carousel-dot:hover {
  background: rgba(255, 255, 255, 0.65);
}

@media (max-width: 768px) {
  .carousel-btn {
    width: 40px;
    height: 40px;
    font-size: 0.9rem;
  }

  .carousel-caption {
    padding: 1.25rem 1rem 2.6rem;
  }

  .carousel-caption-text {
    font-size: 0.82rem;
  }
}

/* ========== 卡片网格 & 悬停 ========== */
.card-grid {
  display: grid;
  gap: 1.25rem;
}

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

.info-card {
  background: var(--color-white);
  padding: 1.75rem 1.5rem;
  border-radius: var(--radius);
  border: 1px solid rgba(74, 93, 78, 0.12);
  box-shadow: 0 8px 30px rgba(45, 58, 49, 0.06);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.info-card:hover {
  transform: translateY(-8px);
  border-color: var(--color-gold);
  box-shadow: 0 20px 50px rgba(45, 58, 49, 0.12), 0 0 0 1px var(--color-gold);
}

.info-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(197, 160, 89, 0.12);
  color: var(--color-gold);
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.info-card h3 {
  margin: 0 0 0.35rem;
  font-size: 1.22rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--color-green-deep);
}

.card-metric {
  font-family: var(--font-serif);
  font-size: 1.08rem;
  color: var(--color-gold);
  margin: 0 0 0.65rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.info-card p:last-child {
  margin: 0;
  font-size: 0.92rem;
  color: var(--color-text-muted);
}

/* 产品卡片 */
.product-grid {
  grid-template-columns: repeat(3, 1fr);
}

.product-card {
  background: var(--color-cream);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(74, 93, 78, 0.1);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.product-card:hover {
  transform: translateY(-10px);
  border-color: var(--color-gold);
  box-shadow: 0 24px 55px rgba(45, 58, 49, 0.14), 0 0 0 1px var(--color-gold);
}

.product-card:focus-within {
  transform: translateY(-10px);
  border-color: var(--color-gold);
  box-shadow: 0 24px 55px rgba(45, 58, 49, 0.14), 0 0 0 1px var(--color-gold);
}

/* 本地产品图为横向双支棚拍（宽高比约 1.36~1.42），勿用竖版 4:5 以免裁切过度 */
.product-card-image {
  aspect-ratio: 10 / 7;
  overflow: hidden;
  background: var(--color-cream);
}

.product-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.product-card:hover .product-card-image img {
  transform: scale(1.06);
}

.product-card:focus-within .product-card-image img {
  transform: scale(1.06);
}

.product-card-body {
  padding: 1.5rem 1.35rem 1.75rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.product-card-body h3 {
  margin: 0 0 0.5rem;
  font-size: 1.28rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--color-green-deep);
}

.product-card-body p {
  margin: 0 0 1rem;
  flex: 1;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.product-tag {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--color-gold);
  font-weight: 600;
}

/* ========== 巴马水谷 全宽背景 ========== */
.section-valley {
  color: var(--color-white);
  padding: clamp(5rem, 12vw, 8rem) 0;
}

.section-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.section-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.section-bg-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    120deg,
    rgba(35, 48, 40, 0.88) 0%,
    rgba(61, 82, 71, 0.72) 50%,
    rgba(28, 38, 32, 0.85) 100%
  );
}

.section-valley .container {
  position: relative;
  z-index: 1;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-top: 2rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(197, 160, 89, 0.45);
  font-size: 0.88rem;
  backdrop-filter: blur(6px);
}

.pill i {
  color: var(--color-gold);
}

/* ========== 资质 ========== */
.section-certs {
  background: var(--color-white);
}

.cert-highlight {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  max-width: 720px;
  margin: 0 auto 2rem;
  padding: 1.75rem;
  background: linear-gradient(135deg, var(--color-cream) 0%, var(--color-cream-2) 100%);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(197, 160, 89, 0.35);
}

.cert-highlight-icon {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  background: var(--color-green-mid);
  color: var(--color-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  flex-shrink: 0;
}

.cert-highlight h3 {
  margin: 0 0 0.35rem;
  font-size: 1.28rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--color-green-deep);
}

.cert-highlight p {
  margin: 0;
  color: var(--color-text-muted);
}

.cert-block {
  margin-bottom: clamp(2.15rem, 4.5vw, 3.1rem);
}

.cert-block:last-child {
  margin-bottom: 0;
}

.cert-block-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 1.5rem;
}

.cert-block-title {
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 2.5vw, 1.55rem);
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--color-green-deep);
  margin: 0 0 0.5rem;
}

.cert-block-lead {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.75;
}

.cert-card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.05rem;
}

.cert-card {
  margin: 0;
  padding: 1.35rem 1.15rem;
  background: var(--color-cream);
  border: 1px solid rgba(74, 93, 78, 0.12);
  border-radius: var(--radius);
  box-shadow: 0 6px 24px rgba(45, 58, 49, 0.05);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.cert-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-gold);
  box-shadow: 0 16px 40px rgba(45, 58, 49, 0.1), 0 0 0 1px var(--color-gold);
}

.cert-card-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(197, 160, 89, 0.14);
  color: var(--color-gold);
  font-size: 1.05rem;
  margin-bottom: 0.85rem;
}

.cert-card-name {
  font-family: var(--font-serif);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-green-deep);
  margin: 0 0 0.45rem;
  line-height: 1.35;
}

.cert-card-desc {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--color-text-muted);
}

.cert-wall {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.85rem;
}

.cert-wall-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  text-align: center;
  border: 1px solid rgba(74, 93, 78, 0.15);
  border-radius: var(--radius);
  padding: 1.35rem 0.85rem 1.25rem;
  min-height: 8.5rem;
  background: var(--color-cream);
  transition: transform var(--transition), border-color var(--transition);
}

.cert-wall-item:hover {
  transform: translateY(-6px);
  border-color: var(--color-gold);
}

.cert-wall-item i {
  display: block;
  font-size: 1.5rem;
  color: var(--color-gold);
  margin-bottom: 0.55rem;
}

.cert-wall-item-title {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-green-deep);
  line-height: 1.4;
  margin-bottom: 0.35rem;
}

.cert-wall-item-meta {
  display: block;
  font-size: 0.72rem;
  line-height: 1.45;
  color: var(--color-text-muted);
  font-weight: 400;
}

/* ========== CSR ========== */
.section-csr {
  background: linear-gradient(180deg, var(--color-white) 0%, var(--color-cream) 100%);
}

.csr-list {
  list-style: none;
  padding: 0;
  margin: 1.25rem 0 0;
}

.csr-list li {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.65rem;
  color: var(--color-text-muted);
}

.csr-list i {
  color: var(--color-gold);
}

.section-csr .section-head .section-desc + .section-desc {
  margin-top: 1rem;
}

.section-csr .section-head {
  margin-bottom: clamp(1.75rem, 4vw, 2.5rem);
}

.csr-top-grid {
  display: grid;
  grid-template-columns: 1.55fr 0.75fr;
  gap: clamp(1rem, 3vw, 1.85rem);
  align-items: stretch;
  margin-bottom: clamp(1.25rem, 3vw, 2.1rem);
}

.csr-top-grid .csr-visual {
  max-width: none;
  margin: 0;
  height: 100%;
}

.csr-list--side {
  margin: 0;
  padding: 1.15rem 1.15rem;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid rgba(74, 93, 78, 0.12);
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 34px rgba(45, 58, 49, 0.06);
  height: 100%;
}

.csr-top-grid .csr-hero-photo {
  height: 100%;
  aspect-ratio: auto;
}

.csr-top-grid .csr-hero-photo img {
  height: 100%;
  object-position: center;
}

.csr-list--side li {
  min-width: 0;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
  font-size: 0.95rem;
  line-height: 1.65;
  flex-wrap: nowrap;
  white-space: nowrap;
}

.csr-list--side li:last-child {
  margin-bottom: 0;
}

.csr-list--side i {
  flex: 0 0 auto;
  margin-top: 0.25rem;
  font-size: 1.05rem;
}

.csr-list--side li strong {
  white-space: nowrap;
}

.csr-item-text {
  display: block;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

.csr-visual {
  max-width: min(780px, 94vw);
  margin: 0 auto 1.55rem;
}

.csr-hero-photo {
  margin: 0;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.csr-hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
  display: block;
}

.csr-list--centered {
  max-width: 760px;
  margin: 0 auto 2.1rem;
  text-align: left;
}

.csr-list--centered li {
  white-space: nowrap;
  flex-wrap: nowrap;
  gap: 0.55rem;
  margin-bottom: 0.55rem;
  font-size: 0.95rem;
  line-height: 1.6;
}

.csr-extend {
  margin-top: clamp(2.15rem, 5.5vw, 3.5rem);
  padding-top: clamp(1.6rem, 4.5vw, 2.6rem);
  border-top: 1px solid rgba(74, 93, 78, 0.1);
}

.csr-quote {
  margin: 0 0 1.6rem;
  padding: 1.35rem 1.5rem 1.35rem 1.75rem;
  border-left: 4px solid var(--color-gold);
  background: rgba(197, 160, 89, 0.08);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.csr-quote p {
  margin: 0 0 0.65rem;
  font-family: var(--font-serif);
  font-size: clamp(1.02rem, 2vw, 1.18rem);
  font-weight: 600;
  line-height: 1.7;
  color: var(--color-green-deep);
  letter-spacing: 0.04em;
}

.csr-quote footer {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-style: normal;
}

.csr-kpi-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
  margin-bottom: 1.6rem;
}

.csr-kpi {
  text-align: center;
  padding: 1.15rem 0.75rem;
  background: var(--color-white);
  border: 1px solid rgba(74, 93, 78, 0.12);
  border-radius: var(--radius);
  box-shadow: 0 6px 20px rgba(45, 58, 49, 0.05);
}

.csr-kpi-value {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(1.15rem, 2.2vw, 1.35rem);
  font-weight: 800;
  color: var(--color-gold);
  letter-spacing: 0.06em;
  margin-bottom: 0.35rem;
}

.csr-kpi-label {
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--color-text-muted);
}

.csr-action-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.05rem;
  margin-bottom: 1.2rem;
}

.csr-action-card {
  margin: 0;
  padding: 1.4rem 1.25rem;
  background: var(--color-white);
  border: 1px solid rgba(74, 93, 78, 0.1);
  border-radius: var(--radius);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.csr-action-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-gold);
  box-shadow: 0 14px 36px rgba(45, 58, 49, 0.08);
}

.csr-action-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(197, 160, 89, 0.12);
  color: var(--color-gold);
  font-size: 1.1rem;
  margin-bottom: 0.85rem;
}

.csr-action-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-green-deep);
  margin: 0 0 0.5rem;
}

.csr-action-desc {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--color-text-muted);
}

.csr-footnote {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--color-text-muted);
  text-align: center;
  max-width: 52rem;
  margin-inline: auto;
}

.section-csr .csr-list li {
  align-items: flex-start;
  margin-bottom: 0.85rem;
  line-height: 1.55;
}

.section-csr .csr-list li strong {
  color: var(--color-green-mid);
}

/* ========== 合作伙伴 ========== */
.section-partners {
  background: var(--color-white);
}

.map-block {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  margin-bottom: 0.75rem;
}

.map-image {
  width: 100%;
  height: clamp(220px, 40vw, 380px);
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05);
}

.map-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1rem 1.25rem;
  background: linear-gradient(transparent, rgba(35, 48, 40, 0.85));
  color: var(--color-white);
  font-size: 0.92rem;
  letter-spacing: 0.08em;
}

.partner-note {
  text-align: center;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

.logo-wall {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.85rem;
}

.logo-wall-item {
  aspect-ratio: 5 / 3;
  border: 1px dashed rgba(74, 93, 78, 0.2);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  color: var(--color-text-muted);
  font-size: 0.8rem;
  background: var(--color-cream);
  transition: border-color var(--transition), color var(--transition), transform var(--transition);
}

.logo-wall-item:hover {
  border-color: var(--color-gold);
  color: var(--color-green-deep);
  transform: translateY(-4px);
}

.logo-wall-item i {
  font-size: 1.35rem;
  color: var(--color-gold);
}

/* ========== CTA ========== */
.section-cta {
  background: linear-gradient(
    125deg,
    var(--color-green-deep) 0%,
    var(--color-green-mid) 45%,
    #2c3d34 100%
  );
  padding: clamp(4.5rem, 12vw, 6.5rem) 0;
  position: relative;
  overflow: hidden;
}

.section-cta::before {
  content: "";
  position: absolute;
  width: 140%;
  height: 140%;
  top: -20%;
  left: -20%;
  background: radial-gradient(circle at 30% 20%, rgba(197, 160, 89, 0.12) 0%, transparent 45%);
  pointer-events: none;
}

.cta-inner {
  position: relative;
  text-align: center;
  color: var(--color-white);
  max-width: 640px;
}

.cta-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4.5vw, 2.85rem);
  font-weight: 800;
  margin: 0 0 1rem;
  letter-spacing: 0.22em;
  text-indent: 0.22em;
  line-height: 1.3;
}

.cta-desc {
  margin: 0 0 2rem;
  color: rgba(255, 255, 255, 0.88);
  font-size: 1.06rem;
  font-weight: 400;
  line-height: 1.85;
  letter-spacing: 0.04em;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

/* ========== 页脚 ========== */
.site-footer {
  background: var(--color-green-deep);
  color: rgba(255, 255, 255, 0.88);
  padding-top: 3.5rem;
}

.logo-footer .logo-mark {
  color: var(--color-white);
  text-shadow: none;
}

.logo-footer .logo-sub {
  color: var(--color-gold);
}

.footer-slogan {
  margin: 0.75rem 0 0;
  font-size: 0.9rem;
  opacity: 0.85;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1fr;
  gap: 2rem;
  padding-bottom: 2.5rem;
}

.footer-col h3 {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-gold);
  margin: 0 0 0.65rem;
  letter-spacing: 0.12em;
}

.footer-col address {
  font-style: normal;
  font-size: 0.9rem;
  line-height: 1.7;
  opacity: 0.9;
}

.footer-col p {
  margin: 0 0 0.35rem;
  font-size: 0.9rem;
}

.footer-qr {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-top: 0.9rem;
  padding-top: 0.9rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-qr-box {
  width: 84px;
  height: 84px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px dashed rgba(197, 160, 89, 0.65);
  flex: 0 0 auto;
}

.footer-qr-meta {
  min-width: 0;
}

.footer-qr-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.92);
  letter-spacing: 0.08em;
  margin-bottom: 0.3rem;
}

.footer-qr-note {
  font-size: 0.82rem;
  opacity: 0.7;
  line-height: 1.55;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 1.25rem 0;
}

.footer-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer-bottom p {
  margin: 0;
  font-size: 0.82rem;
  opacity: 0.75;
}

.footer-icp {
  margin-left: 0.75rem;
  opacity: 0.95;
  white-space: nowrap;
}

.footer-icp a {
  color: rgba(255, 255, 255, 0.88);
  text-decoration: none;
  border-bottom: 1px solid rgba(197, 160, 89, 0.45);
  padding-bottom: 1px;
}

.footer-icp a:hover {
  color: var(--color-gold);
  border-bottom-color: rgba(197, 160, 89, 0.9);
}

.back-top {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid rgba(197, 160, 89, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gold);
  transition: background var(--transition), transform var(--transition);
}

.back-top:hover {
  background: rgba(197, 160, 89, 0.15);
  transform: translateY(-3px);
}

/* ========== 滚动Reveal ========== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.75s cubic-bezier(0.22, 1, 0.36, 1), transform 0.75s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* 错峰动画 */
.reveal:nth-child(1) {
  transition-delay: 0.05s;
}
.reveal:nth-child(2) {
  transition-delay: 0.1s;
}
.reveal:nth-child(3) {
  transition-delay: 0.15s;
}
.reveal:nth-child(4) {
  transition-delay: 0.2s;
}
.reveal:nth-child(5) {
  transition-delay: 0.25s;
}
.reveal:nth-child(6) {
  transition-delay: 0.3s;
}

/* ========== 响应式 ========== */
@media (max-width: 992px) {
  .mineral-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .product-grid {
    grid-template-columns: 1fr;
    max-width: 420px;
    margin-inline: auto;
  }

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

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

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

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

@media (max-width: 768px) {
  :root {
    --header-h: 64px;
  }

  .header-inner {
    width: min(1200px, 92vw);
    overflow-x: hidden;
  }

  .site-header {
    overflow-x: hidden;
  }

  .logo {
    flex-direction: row;
    align-items: center;
    min-width: 0;
  }

  .logo-img--header {
    max-width: 58vw;
    filter: none;
  }

  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    inset: 0;
    top: var(--header-h);
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(16px);
    flex-direction: column;
    justify-content: flex-start;
    padding: 2rem 1.5rem;
    gap: 2rem;
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    box-shadow: -8px 0 40px rgba(0, 0, 0, 0.08);
    z-index: 1001;
    height: calc(100dvh - var(--header-h));
    max-width: 100vw;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .site-header.menu-open {
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .main-nav.is-open {
    transform: translateX(0);
  }

  .nav-list {
    flex-direction: column;
    gap: 0.25rem;
    width: 100%;
  }

  .nav-list a {
    color: var(--color-green-deep);
    font-size: 1.05rem;
    padding: 0.65rem 0;
    border-bottom: 1px solid rgba(74, 93, 78, 0.12);
  }

  .btn-nav {
    width: 100%;
    justify-content: center;
  }

  .site-header.is-scrolled .logo-mark,
  .site-header.is-scrolled .logo-sub {
    color: var(--color-green-deep);
  }

  /* 移动端首屏未滚动时导航仍为浅色背景可读：打开菜单后已是白底 */

  .hero-points {
    flex-direction: column;
    align-items: center;
  }

  .split,
  .split.split-reverse {
    grid-template-columns: 1fr;
    direction: ltr;
  }

  .split-reverse > * {
    direction: ltr;
  }

  .split-media {
    order: -1;
  }

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

  .cert-card-grid {
    grid-template-columns: 1fr;
  }

  .csr-kpi-row {
    grid-template-columns: 1fr;
    max-width: 24rem;
    margin-inline: auto;
  }

  .csr-action-grid {
    grid-template-columns: 1fr;
  }

  .csr-visual {
    max-width: 94vw;
    margin-bottom: 1.25rem;
  }

  .csr-top-grid {
    grid-template-columns: 1fr;
    gap: 1.1rem;
  }

  .csr-top-grid .csr-visual {
    order: -1;
  }

  .csr-list--side {
    max-width: 760px;
    margin-inline: auto;
  }

  .csr-top-grid .csr-hero-photo {
    height: auto;
    aspect-ratio: 3 / 2;
  }

  .csr-top-grid .csr-hero-photo img {
    height: 100%;
    object-position: center 40%;
  }

  .csr-list--side li {
    white-space: normal;
    flex-wrap: wrap;
    line-height: 1.55;
  }

  .csr-list--side li strong {
    white-space: normal;
  }

  .csr-item-text {
    display: inline;
    overflow: visible;
    text-overflow: clip;
    white-space: normal;
  }

  .csr-hero-photo {
    aspect-ratio: 3 / 2;
  }

  .cert-wall {
    grid-template-columns: 1fr;
  }

  .cert-highlight {
    flex-direction: column;
    text-align: center;
    align-items: center;
  }

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

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

  .csr-list--centered li {
    white-space: normal;
    flex-wrap: wrap;
    gap: 0.65rem;
    margin-bottom: 0.65rem;
    font-size: 1rem;
    line-height: 1.55;
  }

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

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

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hero-waves {
    animation: none;
  }

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