/* ===== 变量与基础 ===== */
:root {
  --color-primary: #2d5a3d;
  --color-primary-light: #4a7c59;
  --color-primary-dark: #1a3d2e;
  --color-accent: #c9a227;
  --color-bg: #f8f6f1;
  --color-text: #2c2c2c;
  --color-text-muted: #5c5c5c;
  --font-serif: "Noto Serif SC", "SimSun", serif;
  --font-sans: "Noto Sans SC", "PingFang SC", sans-serif;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(45, 90, 61, 0.12);
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== 头部 ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 24px;
  background: rgba(248, 246, 241, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(45, 90, 61, 0.08);
  transition: var(--transition);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: baseline;
  gap: 6px;
  text-decoration: none;
  color: var(--color-primary-dark);
  font-weight: 600;
}

.logo-icon {
  font-size: 1.5rem;
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 1.35rem;
}

.logo-sub {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-weight: 400;
}

.nav {
  display: flex;
  gap: 28px;
}

.nav-link {
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition);
}

.nav-link:hover::after {
  width: 100%;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-primary);
}

@media (max-width: 768px) {
  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    padding: 16px;
    background: rgba(248, 246, 241, 0.98);
    border-bottom: 1px solid rgba(45, 90, 61, 0.1);
  }
  .nav.nav-open {
    display: flex;
  }
  .menu-toggle {
    display: flex;
  }
  .menu-toggle.menu-open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  .menu-toggle.menu-open span:nth-child(2) {
    opacity: 0;
  }
  .menu-toggle.menu-open span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }
  .menu-toggle span {
    transition: transform 0.25s ease, opacity 0.25s ease;
  }
}

/* ===== 轮播图 ===== */
.carousel {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 520px;
  overflow: hidden;
}

.carousel-track {
  position: relative;
  width: 100%;
  height: 100%;
}

.carousel-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.7s ease, visibility 0.7s ease;
}

.carousel-slide.slide-active {
  opacity: 1;
  visibility: visible;
  z-index: 1;
}

.slide-bg {
  position: absolute;
  inset: 0;
  /* 优先使用 --bg-image（图片），没有则用 --bg（渐变） */
  background-image: var(--bg-image, var(--bg));
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-color: var(--color-primary);
}

.slide-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 70% 50%, rgba(255,255,255,0.15) 0%, transparent 50%);
  pointer-events: none;
}

.slide-content {
  position: relative;
  z-index: 2;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 120px 10% 80px;
  max-width: 640px;
}

.slide-tag {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  border-radius: 999px;
  margin-bottom: 20px;
  animation: fadeUp 0.6s ease both;
}

.slide-content h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  color: #fff;
  line-height: 1.3;
  margin-bottom: 16px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.15);
  animation: fadeUp 0.6s 0.1s ease both;
}

.slide-content p {
  color: rgba(255, 255, 255, 0.92);
  font-size: 1.05rem;
  margin-bottom: 28px;
  animation: fadeUp 0.6s 0.2s ease both;
}

.slide-cta {
  display: inline-flex;
  align-items: center;
  padding: 12px 28px;
  background: #fff;
  color: var(--color-primary-dark);
  text-decoration: none;
  font-weight: 600;
  border-radius: 999px;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
  animation: fadeUp 0.6s 0.3s ease both;
}

.slide-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0,0,0,0.2);
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 轮播按钮 */
.carousel-controls {
  position: absolute;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  z-index: 10;
}

.carousel-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.6);
  background: rgba(255,255,255,0.15);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.carousel-btn svg {
  width: 22px;
  height: 22px;
}

.carousel-btn:hover {
  background: rgba(255,255,255,0.35);
  border-color: rgba(255,255,255,0.9);
  transform: scale(1.05);
}

/* 圆点指示器 */
.carousel-dots {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 10;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.7);
  background: transparent;
  cursor: pointer;
  transition: var(--transition);
  padding: 0;
}

.dot:hover {
  background: rgba(255,255,255,0.4);
}

.dot.dot-active {
  background: #fff;
  width: 28px;
  border-radius: 999px;
}

/* 进度条 */
.carousel-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: rgba(255,255,255,0.2);
  z-index: 10;
  overflow: hidden;
}

.carousel-progress-bar {
  height: 100%;
  width: 0;
  background: #fff;
  transition: width 0.1s linear;
}

/* ===== Tab 区域 ===== */
.tabs-section {
  padding: 80px 0 100px;
  background: var(--color-bg);
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  color: var(--color-primary-dark);
  text-align: center;
  margin-bottom: 8px;
}

.learn-header {
  margin-bottom: 40px;
}

.learn-header .section-title {
  margin-bottom: 8px;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin: 0;
}

.tabs-wrapper {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.tabs-header {
  display: flex;
  position: relative;
  flex-wrap: wrap;
  gap: 4px;
  padding: 8px 8px 0;
  background: rgba(45, 90, 61, 0.04);
  border-bottom: 1px solid rgba(45, 90, 61, 0.1);
}

.tab-btn {
  flex: 1;
  min-width: 100px;
  padding: 16px 20px;
  border: none;
  background: transparent;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-muted);
  cursor: pointer;
  border-radius: 8px 8px 0 0;
  transition: color 0.18s ease-out, background 0.18s ease-out;
  position: relative;
  z-index: 1;
}

.tab-btn:hover {
  color: var(--color-primary);
  background: rgba(255,255,255,0.6);
}

.tab-btn.tab-active {
  color: var(--color-primary);
  font-weight: 600;
}

.tab-indicator {
  position: absolute;
  bottom: 0;
  left: 8px;
  height: 3px;
  background: var(--color-primary);
  border-radius: 3px 3px 0 0;
  transition: transform 0.22s ease-out, width 0.22s ease-out;
  z-index: 0;
  will-change: transform;
}

.tabs-content {
  position: relative;
  min-height: 320px;
}

.tab-panel {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.22s ease-out;
  pointer-events: none;
}

.tab-panel.tab-panel-active {
  position: relative;
  z-index: 1;
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.tab-panel[hidden] {
  display: block !important;
}

.panel-inner {
  padding: 40px 32px;
}

/* 公司简介面板（图文左右布局） */
.panel-about {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  max-width: 900px;
  margin: 0 auto;
}

.about-text .card-icon {
  font-size: 2.2rem;
  display: block;
  margin-bottom: 12px;
}

.about-text h3 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: var(--color-primary-dark);
  margin-bottom: 14px;
}

.about-text p {
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.75;
}

.about-stats {
  padding: 24px 0;
}

.stats {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px 32px;
}

.stats li {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 16px 20px;
  background: rgba(45, 90, 61, 0.06);
  border-radius: var(--radius);
  transition: var(--transition);
}

.stats li:hover {
  background: rgba(45, 90, 61, 0.1);
}

.stats strong {
  font-size: 1.6rem;
  color: var(--color-primary);
  margin-bottom: 4px;
  line-height: 1.2;
}

.stats span {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* 产品网格 */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.product-card {
  padding: 24px;
  background: var(--color-bg);
  border-radius: var(--radius);
  text-align: center;
  transition: var(--transition);
  border: 1px solid transparent;
}

.product-card:hover {
  border-color: rgba(45, 90, 61, 0.2);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(45, 90, 61, 0.1);
}

.product-img {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.product-card h4 {
  font-size: 1.1rem;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

.product-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* 展品展示 */
.exhibit-intro {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(45, 90, 61, 0.08);
}

.exhibit-intro p {
  margin: 0;
  font-size: 0.98rem;
}

.exhibit-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.exhibit-card {
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: 24px 20px;
  border: 1px solid transparent;
  transition: var(--transition);
}

.exhibit-card:hover {
  border-color: rgba(45, 90, 61, 0.2);
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(45, 90, 61, 0.12);
}

.exhibit-info {
  text-align: center;
}

.exhibit-info h4 {
  font-size: 1.1rem;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

.exhibit-info p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.5;
}

/* 新闻列表 */
.news-list {
  list-style: none;
  max-width: 640px;
  margin: 0 auto;
}

.news-item {
  padding: 16px 0;
  border-bottom: 1px solid rgba(45, 90, 61, 0.08);
  display: flex;
  align-items: baseline;
  gap: 20px;
  transition: background var(--transition);
}

.news-item:hover {
  background: rgba(45, 90, 61, 0.04);
}

.news-date {
  flex-shrink: 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.news-item a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
}

.news-item a:hover {
  color: var(--color-primary);
}

/* 企业文化 */
.culture-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.culture-item {
  padding: 28px;
  background: linear-gradient(145deg, rgba(45, 90, 61, 0.06), rgba(45, 90, 61, 0.02));
  border-radius: var(--radius);
  text-align: center;
  transition: var(--transition);
}

.culture-item:hover {
  background: linear-gradient(145deg, rgba(45, 90, 61, 0.1), rgba(45, 90, 61, 0.04));
  transform: translateY(-2px);
}

.culture-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 12px;
}

.culture-item h4 {
  font-size: 1.1rem;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

.culture-item p {
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

/* 联系我们（独立区块） */
.contact-section {
  padding: 72px 0 88px;
  background: linear-gradient(180deg, rgba(45, 90, 61, 0.06) 0%, var(--color-bg) 100%);
  border-top: 1px solid rgba(45, 90, 61, 0.08);
}

.contact-section-inner {
  max-width: 1000px;
  margin: 0 auto;
}

.contact-header {
  text-align: center;
  margin-bottom: 44px;
}

.contact-title {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  color: var(--color-primary-dark);
  margin-bottom: 10px;
}

.contact-desc {
  color: var(--color-text-muted);
  font-size: 0.98rem;
  margin: 0;
}

.contact-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-block {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 20px 24px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: 0 2px 12px rgba(45, 90, 61, 0.06);
  transition: var(--transition);
}

.contact-block:hover {
  box-shadow: 0 4px 20px rgba(45, 90, 61, 0.1);
}

.contact-icon {
  font-size: 1.6rem;
  flex-shrink: 0;
  line-height: 1;
}

.contact-block-text {
  min-width: 0;
}

.contact-block h4 {
  font-size: 1rem;
  color: var(--color-primary-dark);
  margin-bottom: 6px;
}

.contact-block p {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.5;
}

.contact-map-wrap {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(45, 90, 61, 0.04);
  min-height: 260px;
}

.contact-map-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  gap: 8px;
}

.contact-map-placeholder span {
  font-weight: 600;
  color: var(--color-primary);
}

/* ===== 首页入口区（跳转了解更多/联系我们） ===== */
.home-cta {
  padding: 48px 24px 56px;
  background: var(--color-bg);
  text-align: center;
}

.home-cta-text {
  color: var(--color-text-muted);
  font-size: 0.98rem;
  margin-bottom: 20px;
}

.home-cta-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.home-cta-btn {
  display: inline-block;
  padding: 12px 28px;
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  border-radius: 999px;
  transition: var(--transition);
}

.home-cta-btn:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
}

.home-cta-btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.home-cta-btn-outline:hover {
  background: rgba(45, 90, 61, 0.08);
}

/* ===== 页脚 ===== */
.footer {
  padding: 32px 24px;
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.85);
  text-align: center;
}

.footer p {
  font-size: 0.9rem;
}

.footer-tagline {
  margin-top: 8px;
  font-size: 0.85rem;
  opacity: 0.8;
}

@media (max-width: 768px) {
  .carousel-controls {
    bottom: 72px;
  }
  .carousel-dots {
    bottom: 28px;
  }
  .slide-content {
    padding: 100px 8% 60px;
  }
  .learn-header {
    margin-bottom: 28px;
  }
  .tabs-header {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
  }
  .tab-btn {
    min-width: 90px;
    flex: 0 0 auto;
  }
  .panel-inner {
    padding: 24px 20px;
  }
  .panel-about {
    grid-template-columns: 1fr;
    gap: 28px;
    text-align: center;
  }
  .about-text p {
    text-align: left;
  }
  .about-stats {
    padding: 0;
  }
  .stats {
    grid-template-columns: 1fr;
  }
  .stats li {
    align-items: center;
  }
  .contact-section {
    padding: 56px 0 72px;
  }
  .contact-body {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .contact-map-wrap {
    min-height: 200px;
  }
}