/* ============================================================
   ME-TOOLS 工业五金外贸工厂站
   设计系统：工业精密风 / 深炭金属 + 工业琥珀
   移动优先 · RTL 支持 · 纯静态无框架
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  --ink:        #171d21;   /* 近黑炭色（tinted 深蓝灰） */
  --ink-2:      #22303a;   /* 深炭-蓝调面板 */
  --em-amber:   #e8a33d;   /* 工业琥珀（安全黄） */
  --em-amber-d: #c9831f;
  --paper:      #f4f1ea;   /* 暖调纸色 */
  --paper-2:    #ece8de;
  --metal:      #aeb8bd;   /* 冷金属灰 */
  --metal-2:    #d4d9dc;
  --line:       rgba(23,29,33,.14);
  --line-dark:  rgba(255,255,255,.14);
  --text-soft:  #f0eadf;   /* 深底浅字 */
  --wa:         #25d366;   /* WhatsApp 绿 */
  --shadow:     0 10px 30px rgba(23,29,33,.10);
  --rad:        6px;
  --space:      clamp(3.5rem, 8vw, 6.5rem);
  --font: 'Cairo', system-ui, -apple-system, 'Segoe UI', Roboto,
          'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
}

/* ---------- Reset / Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  overflow-x: clip; /* 消除 .stamp 等装饰元素的横向溢出，保证移动端无横向滚动 */
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
::selection { background: var(--em-amber); color: var(--ink); }

.wrap { width: min(1160px, 92vw); margin-inline: auto; }

/* ---------- Typography ---------- */
h1, h2, h3 { line-height: 1.15; margin: 0 0 .5rem; font-weight: 800; letter-spacing: -.01em; }
h1 { font-size: clamp(2rem, 5.4vw, 3.4rem); }
h2 { font-size: clamp(1.5rem, 3.6vw, 2.3rem); }
h3 { font-size: 1.15rem; }
.lead { font-size: clamp(1rem, 2.4vw, 1.2rem); color: var(--text-soft); max-width: 46ch; }
.kicker { /* 小节标签 */
  display: inline-block; font-size: .82rem; font-weight: 700;
  letter-spacing: .14em; text-transform: uppercase; color: var(--em-amber);
  margin-bottom: .6rem;
}
.section-head { margin-bottom: 2.5rem; }
.section-head .dark-title { color: var(--ink); }
h2.dark-title + p { color: #56616a; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .55rem;
  padding: .85rem 1.5rem; border-radius: var(--rad);
  font-weight: 700; font-size: 1rem; cursor: pointer;
  border: 0; transition: transform .15s ease, box-shadow .15s ease, background .15s;
}
.btn:active { transform: translateY(1px); }
.btn-amber { background: var(--em-amber); color: #1c1504; box-shadow: 0 8px 20px rgba(232,163,61,.35); }
.btn-amber:hover { background: #f0b254; }
.btn-ghost { background: transparent; color: var(--text-soft); border: 1.5px solid var(--line-dark); }
.btn-ghost:hover { border-color: var(--em-amber); color: var(--em-amber); }
.btn-wa { background: var(--wa); color: #fff; box-shadow: 0 8px 20px rgba(37,211,102,.30); }
.btn-wa:hover { background: #2fd96f; }
.btn-dark { background: var(--ink); color: var(--text-soft); }
.btn-dark:hover { background: var(--ink-2); }

/* ============================================================
   NAV
   ============================================================ */
.site-nav {
  position: sticky; top: 0; z-index: 60;
  background: rgba(23,29,33,.96); backdrop-filter: blur(8px);
  color: var(--text-soft); border-bottom: 1px solid var(--line-dark);
}
.nav-inner {
  display: flex; align-items: center; gap: 1.25rem;
  padding: .65rem 0; min-height: 62px;
}
.brand { display: flex; align-items: center; gap: .6rem; font-weight: 900; letter-spacing: .02em; font-size: 1.15rem; }
/* 品牌徽标：文字版为琥珀方块（如 QH），有 logo 图时显示图片 */
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center; flex: none;
}
.brand-mark:not(.has-logo) {
  width: 34px; height: 34px; border-radius: 5px;
  background: var(--em-amber); color: #1c1504;
  font-weight: 900; font-size: 1.05rem;
}
.brand-logo {
  display: block; height: 40px; max-height: 44px; width: auto; max-width: 170px;
  object-fit: contain; border-radius: 3px;
}
.brand .brand-name { line-height: 1.1; }
footer .brand-logo { height: 44px; max-width: 190px; }
.nav-links { display: flex; align-items: center; gap: 1.4rem; margin-inline-start: auto; font-weight: 600; font-size: .95rem; }
.nav-links a { opacity: .85; }
.nav-links a:hover { opacity: 1; color: var(--em-amber); }
.lang-switch { display: flex; gap: .2rem; margin-inline-end: .2rem; }
.lang-switch a {
  padding: .28rem .55rem; border-radius: 4px; font-size: .78rem; font-weight: 700;
  border: 1px solid var(--line-dark); opacity: .9;
}
.lang-switch a.on { background: var(--em-amber); color: #1c1504; border-color: var(--em-amber); }
.nav-cta { display: inline-flex; }
.nav-toggle {
  display: none; background: none; border: 0; color: var(--text-soft);
  width: 42px; height: 42px; cursor: pointer; margin-inline-start: auto;
}
.nav-toggle svg { width: 26px; height: 26px; }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative; overflow: hidden; color: var(--text-soft);
  background:
    radial-gradient(1200px 500px at 85% -10%, rgba(232,163,61,.16), transparent 60%),
    linear-gradient(160deg, #10161a 0%, var(--ink) 55%, var(--ink-2) 100%);
}
.hero-grid { /* 工业斜线网格纹理 */
  position: absolute; inset: 0; opacity: .5; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,.9), transparent 75%);
}
.hero-inner { position: relative; padding: clamp(3.5rem, 9vw, 6.5rem) 0; display: grid; gap: 2rem; }
.hero h1 span.accent { color: var(--em-amber); }
.hero-actions { display: flex; flex-wrap: wrap; gap: .9rem; margin-top: 1.4rem; }
.hero-meta { margin-top: 2.2rem; display: flex; flex-wrap: wrap; gap: 1.2rem 2.2rem; font-size: .9rem; color: var(--metal); border-top: 1px solid var(--line-dark); padding-top: 1.4rem; }
.hero-meta strong { color: var(--text-soft); display: block; font-size: 1.05rem; }

/* ============================================================
   STATS band
   ============================================================ */
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  background: var(--line); border-radius: var(--rad); overflow: hidden;
  box-shadow: var(--shadow); margin-top: -2.6rem; position: relative; z-index: 2;
}
.stat { background: #fff; padding: 1.6rem 1.1rem; text-align: center; }
.stat b { font-size: clamp(1.5rem, 3.4vw, 2.2rem); color: var(--em-amber-d); font-weight: 900; display: block; }
.stat span { font-size: .86rem; color: #56616a; font-weight: 600; }

/* ============================================================
   SECTIONS (shared rhythm)
   ============================================================ */
section { padding: var(--space) 0; }
.section-on-dark { background: var(--ink); color: var(--text-soft); }

/* ---------- Products grid ---------- */
.cat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem; }
.cat-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--rad);
  padding: 1.4rem; display: flex; flex-direction: column; gap: .7rem;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s;
  position: relative; overflow: hidden;
}
.cat-card::before { /* 顶部琥珀线 */
  content: ""; position: absolute; inset: 0 0 auto 0; height: 3px;
  background: var(--em-amber); transform: scaleX(0); transform-origin: start;
  transition: transform .25s ease;
}
.cat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--em-amber); }
.cat-card:hover::before { transform: scaleX(1); }
.cat-ico {
  width: 52px; height: 52px; border-radius: 8px; flex: none;
  background: linear-gradient(145deg, var(--paper-2), #e7e2d5);
  display: grid; place-items: center; color: var(--ink-2);
}
.cat-img {
  width: 100%; aspect-ratio: 4/3; object-fit: cover; border-radius: 8px;
  background: var(--ink-2);
}
.cat-card h3 { margin-bottom: 0; }
.cat-card p { margin: 0; font-size: .9rem; color: #56616a; flex: 1; }
.cat-card .btn { align-self: flex-start; margin-top: .4rem; padding: .55rem 1rem; font-size: .88rem; }

/* ---------- Why / feature grid ---------- */
.feat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.1rem; }
.feat {
  background: rgba(255,255,255,.04); border: 1px solid var(--line-dark);
  border-radius: var(--rad); padding: 1.5rem;
}
.feat b { display: flex; align-items: center; gap: .6rem; font-size: 1.05rem; margin-bottom: .45rem; }
.feat .feat-num { color: var(--em-amber); font-weight: 900; font-size: .9rem; }
.feat p { margin: 0; font-size: .92rem; color: var(--metal); }

/* ---------- About ---------- */
.about { display: grid; grid-template-columns: 1.05fr .95fr; gap: 2.5rem; align-items: center; }
.about-media { position: relative; }
.about-media .stamp {
  position: absolute; right: -14px; bottom: -14px;
  background: var(--em-amber); color: #1c1504; border-radius: 8px;
  padding: .8rem 1.1rem; font-weight: 900; text-align: center; box-shadow: var(--shadow);
}
.about-media .stamp small { display: block; font-weight: 600; font-size: .75rem; opacity: .8; }
.media-box {
  border-radius: var(--rad); overflow: hidden; background: var(--ink-2);
  aspect-ratio: 4/3; position: relative;
  display: grid; place-items: center; color: var(--em-amber);
}
.media-box svg { width: 42%; height: 42%; }
.about-list { list-style: none; padding: 0; margin: 1.2rem 0 0; display: grid; gap: .7rem; }
.about-list li { display: flex; gap: .7rem; align-items: flex-start; }
.about-list .tick {
  flex: none; width: 22px; height: 22px; border-radius: 50%;
  background: var(--em-amber); color: #1c1504; display: grid; place-items: center;
  font-size: .75rem; font-weight: 900; margin-top: .2em;
}

/* ---------- Cert badges ---------- */
.cert-row { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 1.6rem; }
.cert {
  border: 1px solid var(--line-dark); border-radius: 6px; padding: .55rem 1rem;
  font-size: .8rem; font-weight: 700; letter-spacing: .06em;
  display: inline-flex; align-items: center; gap: .5rem; color: var(--metal);
}
.cert::before { content:"✓"; color: var(--em-amber); }

/* ============================================================
   QUOTE / inquiry form
   ============================================================ */
.inquiry-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 2.5rem; align-items: start; }
.inquiry-side .contact-line { display: flex; align-items: center; gap: .8rem; margin-top: 1.4rem; font-size: .98rem; }
.inquiry-side .contact-line svg { width: 26px; height: 26px; color: var(--em-amber); flex: none; }
.form-card {
  background: #fff; border-radius: 10px; padding: clamp(1.2rem, 3vw, 1.9rem);
  box-shadow: var(--shadow); color: var(--ink);
}
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .9rem; }
.field { display: block; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: .8rem; font-weight: 700; color: #56616a; display: block; margin-bottom: .3rem; }
.field input, .field select, .field textarea {
  width: 100%; padding: .72rem .8rem; border: 1px solid var(--line);
  border-radius: var(--rad); font: inherit; background: var(--paper); color: inherit;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: 2px solid var(--em-amber); outline-offset: 0; border-color: var(--em-amber); background: #fff;
}
.form-card .btn { width: 100%; justify-content: center; margin-top: 1rem; }
.form-note { font-size: .78rem; color: #8a939a; margin-top: .7rem; text-align: center; }
#formState { display: none; margin-top: .9rem; padding: .7rem .9rem; border-radius: var(--rad); font-size: .9rem; font-weight: 600; }
#formState.ok { background: #e7f6ec; color: #17773b; }
#formState.err { background: #fdecec; color: #b3261e; }

/* ============================================================
   FOOTER
   ============================================================ */
footer { background: #0f1418; color: var(--metal); padding: 3rem 0 2rem; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2rem; }
footer h4 { color: var(--text-soft); margin-bottom: .9rem; font-size: 1rem; }
.footer-grid ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .5rem; font-size: .92rem; }
.footer-grid a:hover { color: var(--em-amber); }
.footer-bottom { border-top: 1px solid var(--line-dark); margin-top: 2.4rem; padding-top: 1.3rem; font-size: .82rem; display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; }

/* ---------- WhatsApp float ---------- */
.wa-float {
  position: fixed; right: 18px; bottom: 18px; z-index: 70;
  width: 58px; height: 58px; border-radius: 50%;
  background: var(--wa); color: #fff; display: grid; place-items: center;
  box-shadow: 0 10px 26px rgba(37,211,102,.45); transition: transform .18s;
}
.wa-float:hover { transform: scale(1.08); }
.wa-float svg { width: 30px; height: 30px; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .cat-grid { grid-template-columns: repeat(2, 1fr); }
  .about, .inquiry-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .nav-toggle { display: inline-flex; }
  .brand-logo { height: 32px; max-width: 120px; }
  footer .brand-logo { height: 38px; max-width: 150px; }
  .nav-links {
    display: none; position: absolute; inset: 62px 0 auto 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--ink); border-bottom: 1px solid var(--line-dark); padding: .6rem 6%;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: .85rem 0; border-bottom: 1px solid var(--line-dark); }
  .nav-links a:last-child { border-bottom: 0; }
  .nav-cta { display: none; }
  .lang-switch { margin-inline-start: auto; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .cat-grid, .feat-grid { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .wa-float { right: 14px; bottom: 14px; width: 52px; height: 52px; }
}
@media (max-width: 430px) {
  .site-nav .brand-name { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
}

/* ---------- Reveal on scroll ---------- */
.js [data-reveal] { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
.js [data-reveal].in { opacity: 1; transform: none; }

/* ---------- 404 / placeholder ---------- */
.placeholder { text-align: center; padding: 6rem 1rem; }