/* =========================================================
   GfireTech 外贸独立站样式
   规范：CSS 变量、Flex/Grid 响应式、对比度达标、焦点可见、
   移动端用 100dvh、calc() 运算符两侧留空格。
   修改品牌色只需改 :root 变量即可全局生效。
   ========================================================= */
:root {
  --navy: #0b3d91;        /* 主品牌色（深蓝，白字对比度 ~8:1） */
  --navy-dark: #072c6b;
  --orange: #ff6b35;      /* 强调色（仅用于点缀/边框，不作正文底） */
  --ink: #1a2233;         /* 正文深色 */
  --muted: #5b6b85;       /* 次要文字 */
  --bg: #ffffff;
  --bg-alt: #f4f7fb;      /* 交替区块底色 */
  --border: #e2e8f2;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(11, 61, 145, 0.08);
  --maxw: 1140px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--navy); text-decoration: none; }
a:hover { text-decoration: underline; }

/* 焦点可见（无障碍） */
:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 2px;
  border-radius: 4px;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.15s ease, background 0.15s ease;
  text-decoration: none;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn-primary { background: var(--navy); color: #fff; }
.btn-primary:hover { background: var(--navy-dark); }
.btn-ghost { background: transparent; color: var(--navy); border-color: var(--navy); }
.btn-outline { background: #fff; color: var(--navy); border-color: var(--border); }
.btn-outline:hover { border-color: var(--navy); }
.btn-block { width: 100%; text-align: center; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 34px; height: 34px;
  background: var(--navy);
  color: #fff;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 800;
}
.brand-name { font-size: 1.1rem; letter-spacing: 0.3px; }

.primary-nav { display: flex; align-items: center; gap: 22px; }
.primary-nav a { color: var(--ink); font-weight: 600; font-size: 0.95rem; }
.primary-nav a:hover { color: var(--navy); text-decoration: none; }
.nav-cta {
  background: var(--orange);
  color: #fff !important;
  padding: 8px 18px;
  border-radius: 999px;
}
.nav-cta:hover { background: #ec5a26; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 24px; height: 2px;
  background: var(--ink);
  border-radius: 2px;
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(180deg, #eef3fb 0%, #ffffff 100%);
  padding: 60px 0 70px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
  min-height: calc(100dvh - 64px);
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--orange);
  margin: 0 0 12px;
}
.hero h1 {
  font-size: clamp(1.9rem, 4vw, 3rem);
  line-height: 1.15;
  margin: 0 0 16px;
  color: var(--navy);
}
.lead { font-size: 1.08rem; color: var(--muted); margin: 0 0 26px; max-width: 36em; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 30px; }
.hero-stats { display: flex; gap: 30px; list-style: none; padding: 0; margin: 0; }
.hero-stats li { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 1.6rem; color: var(--navy); }
.hero-stats span { font-size: 0.82rem; color: var(--muted); }
.hero-art { display: grid; place-items: center; }

/* ---------- 通用区块 ---------- */
.section { padding: 70px 0; }
.section-alt { background: var(--bg-alt); }
.section-title { font-size: clamp(1.5rem, 3vw, 2.1rem); color: var(--navy); margin: 0 0 8px; }
.section-sub { color: var(--muted); margin: 0 0 36px; font-size: 1.02rem; }

/* ---------- 产品网格 ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 22px;
}
.product-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}
.product-thumb {
  background: var(--bg-alt);
  border-radius: 10px;
  display: grid;
  place-items: center;
  padding: 14px;
  margin-bottom: 16px;
}
.product-card h3 { font-size: 1.1rem; margin: 0 0 8px; color: var(--ink); }
.product-card p { color: var(--muted); margin: 0 0 14px; font-size: 0.95rem; }
.ticks { list-style: none; padding: 0; margin: 0 0 18px; flex: 1; }
.ticks li { position: relative; padding-left: 22px; margin-bottom: 7px; font-size: 0.9rem; color: var(--ink); }
.ticks li::before {
  content: "✓";
  position: absolute; left: 0; top: 0;
  color: var(--navy);
  font-weight: 800;
}

/* ---------- 优势网格 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}
.feature {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.feature-icon {
  width: 46px; height: 46px;
  display: grid; place-items: center;
  border-radius: 12px;
  background: #fff3ec;
  color: var(--orange);
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 14px;
}
.feature h3 { margin: 0 0 8px; font-size: 1.05rem; }
.feature p { margin: 0; color: var(--muted); font-size: 0.93rem; }

/* ---------- 认证 ---------- */
.cert-list {
  display: flex; flex-wrap: wrap; gap: 14px;
  list-style: none; padding: 0; margin: 0;
}
.cert-list li {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 22px;
  font-weight: 800;
  color: var(--navy);
  letter-spacing: 0.5px;
}

/* ---------- 关于 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}
.about-copy p { color: var(--muted); }
.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.stat {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  box-shadow: var(--shadow);
}
.stat strong { display: block; font-size: 1.8rem; color: var(--navy); }
.stat span { font-size: 0.85rem; color: var(--muted); }

/* ---------- 询盘表单 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 40px;
}
.contact-info { list-style: none; padding: 0; margin: 18px 0 0; }
.contact-info li { margin-bottom: 12px; color: var(--muted); }
.contact-info span { display: block; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 1px; color: var(--navy); font-weight: 700; }
.contact-info a { color: var(--ink); font-weight: 600; }

.quote-form {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.field { display: flex; flex-direction: column; }
.field-full { grid-column: 1 / -1; }
.field label { font-size: 0.85rem; font-weight: 700; margin-bottom: 6px; color: var(--ink); }
.field input, .field select, .field textarea {
  padding: 11px 13px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font: inherit;
  color: var(--ink);
  background: #fff;
}
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--navy);
  outline: 3px solid rgba(255, 107, 53, 0.4);
  outline-offset: 0;
}
.field textarea { resize: vertical; }
.hidden-field { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.form-status { grid-column: 1 / -1; margin: 0; font-size: 0.9rem; min-height: 1.2em; }
.form-status.ok { color: #1f9d6b; font-weight: 700; }
.form-status.err { color: #d23b3b; font-weight: 700; }
.quote-form .btn-block { grid-column: 1 / -1; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--navy); color: #cdd9ec; padding: 44px 0 18px; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 30px;
  align-items: start;
}
.site-footer .brand-mark { background: rgba(255,255,255,0.15); }
.footer-brand { font-weight: 800; color: #fff; margin: 10px 0 6px; font-size: 1.1rem; }
.footer-note { margin: 0; font-size: 0.9rem; color: #aebfd9; }
.footer-nav { display: flex; flex-direction: column; gap: 10px; }
.footer-nav a { color: #cdd9ec; font-weight: 600; }
.footer-nav a:hover { color: #fff; }
.footer-lang span { display: block; font-size: 0.8rem; margin-bottom: 8px; color: #aebfd9; }
.footer-lang a { color: #fff; font-weight: 700; margin-right: 10px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.15); margin-top: 30px; padding-top: 16px; }
.footer-bottom p { margin: 0; font-size: 0.82rem; color: #aebfd9; }

/* ---------- 滚动 reveal（JS 触发） ---------- */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .primary-nav {
    position: absolute;
    top: 64px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 8px 0;
    display: none;
  }
  .primary-nav.open { display: flex; }
  .primary-nav a { padding: 14px 20px; }
  .nav-cta { margin: 8px 20px; text-align: center; }

  .hero-grid { grid-template-columns: 1fr; min-height: auto; padding-top: 30px; }
  .hero-art { order: -1; }
  .about-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .quote-form { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}