/* 云尚通展示官网 - 纯静态单页样式（无框架依赖） */
:root {
  --green: #2e7d32;
  --green-dark: #1b5e20;
  --green-light: #66bb6a;
  --cream: #faf7f0;
  --ink: #2b2b2b;
  --ink-soft: #5a5a5a;
  --white: #ffffff;
  --shadow: 0 8px 30px rgba(27, 94, 32, 0.12);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color: var(--ink);
  background: var(--cream);
  line-height: 1.7;
}

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

/* ===== 顶部导航 ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 32px;
  background: rgba(250, 247, 240, 0.9);
  backdrop-filter: blur(8px);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--green), var(--green-light));
  position: relative;
}

.brand-mark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 14px;
  height: 9px;
  transform: translate(-50%, -50%);
  border-radius: 50% 50% 0 0 / 100% 100% 0 0;
  background: var(--white);
  opacity: 0.9;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--green-dark);
}

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

.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 15px;
  transition: color 0.2s;
}

.site-nav a:hover {
  color: var(--green);
}

/* ===== 首屏 Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: url("../img/hero-farmland.jpg") center / cover no-repeat;
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(16, 46, 18, 0.45), rgba(16, 46, 18, 0.55));
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 24px;
  max-width: 860px;
  color: var(--white);
}

.hero-eyebrow {
  font-size: 15px;
  letter-spacing: 4px;
  opacity: 0.92;
  margin-bottom: 18px;
}

.hero h1 {
  font-size: clamp(1.8rem, 4.5vw, 3.2rem);
  line-height: 1.35;
  font-weight: 700;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
  margin-bottom: 20px;
}

.hero-sub {
  font-size: clamp(1rem, 2vw, 1.2rem);
  opacity: 0.95;
  margin-bottom: 32px;
}

.btn {
  display: inline-block;
  padding: 13px 38px;
  border-radius: 999px;
  background: var(--green);
  color: var(--white);
  text-decoration: none;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 1px;
  box-shadow: var(--shadow);
  transition: background 0.2s, transform 0.2s;
}

.btn:hover {
  background: var(--green-dark);
  transform: translateY(-2px);
}

/* ===== 通用 section ===== */
.section-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 96px 0;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  color: var(--green-dark);
  text-align: center;
  margin-bottom: 40px;
  position: relative;
}

h2::after {
  content: "";
  display: block;
  width: 48px;
  height: 4px;
  border-radius: 2px;
  background: var(--green-light);
  margin: 14px auto 0;
}

/* ===== 关于 ===== */
.about {
  background: var(--white);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
}

.about-text p {
  color: var(--ink-soft);
  font-size: 16px;
  margin-bottom: 16px;
  text-align: justify;
}

.about-img {
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

/* ===== 联系 ===== */
.contact {
  background: var(--cream);
}

.contact-tip {
  text-align: center;
  color: var(--ink-soft);
  margin: -20px 0 32px;
  font-size: 14px;
}

.contact-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.contact-card {
  background: var(--white);
  border-radius: 14px;
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--shadow);
}

.contact-card h3 {
  color: var(--green);
  font-size: 15px;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.contact-card p {
  color: var(--ink-soft);
  font-size: 14px;
}

/* ===== 页脚 ===== */
.site-footer {
  padding: 32px 24px;
  text-align: center;
  background: var(--green-dark);
  color: rgba(255, 255, 255, 0.85);
  font-size: 13px;
}

.site-footer .footer-note {
  margin-top: 4px;
  opacity: 0.7;
}

.site-footer .beian-link {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
}

.site-footer .beian-link:hover {
  text-decoration: underline;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .hero {
    min-height: 60vh;
  }

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

  .contact-cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  section {
    padding: 64px 0;
  }
}

@media (max-width: 480px) {
  .site-header {
    padding: 12px 18px;
  }

  .site-nav {
    gap: 18px;
  }

  .site-nav a {
    font-size: 14px;
  }

  .brand-name {
    font-size: 18px;
  }
}