/* ==========================================================
   钣金峰汇 BJFH.WORK — 站点样式
   设计基调：工业钢蓝 + 石墨黑 + 警示橙，浅色主体、深色头部
   断点：>=1080 三栏 / 720~1079 两栏 / <720 单栏
   ========================================================== */

:root {
  --ink:        #0b1a24;   /* 石墨黑 */
  --steel:      #1c2b36;   /* 钢灰 */
  --brand:      #0d5fa8;   /* AMADA 蓝 */
  --brand-dark: #094a83;
  --accent:     #ff6b00;   /* 工业橙 */
  --bg:         #f4f6f8;
  --bg-alt:     #eceff2;
  --card:       #ffffff;
  --text:       #1f2a33;
  --text-soft:  #55646f;
  --line:       #dbe1e6;

  --radius:  14px;
  --radius-sm: 8px;
  --shadow:  0 1px 2px rgba(11,26,36,.06), 0 8px 24px rgba(11,26,36,.07);
  --shadow-lg: 0 18px 48px rgba(11,26,36,.14);

  --wrap: 1160px;
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB",
          system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;   /* 避开 sticky 头部 */
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .6em; letter-spacing: -.01em; }
p { margin: 0 0 1em; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
ul, ol { margin: 0; padding: 0; list-style: none; }

/* 无障碍 */
.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--ink); color: #fff; padding: 12px 18px; z-index: 999;
}
.skip-link:focus { left: 12px; top: 12px; }
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

/* ===================== 头部 ===================== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--ink);
  color: #fff;
  box-shadow: 0 1px 0 rgba(255,255,255,.08);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 68px;
}
.brand { display: flex; align-items: center; gap: 12px; color: #fff; }
.brand:hover { text-decoration: none; }
.brand-mark { width: 40px; height: 40px; flex: none; display: block; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 18px; letter-spacing: .02em; }
.brand-text em {
  font-style: normal; font-size: 11px; letter-spacing: .18em;
  color: rgba(255,255,255,.55); font-family: var(--mono);
}

.nav ul { display: flex; align-items: center; gap: 6px; }
.nav a {
  display: block; padding: 8px 14px; border-radius: 999px;
  color: rgba(255,255,255,.82); font-size: 15px;
}
.nav a:hover { color: #fff; background: rgba(255,255,255,.1); text-decoration: none; }
.nav-cta {
  background: var(--accent) !important; color: #fff !important; font-weight: 600;
}
.nav-cta:hover { background: #ff8124 !important; }
/* 通往 /tools 工作台的入口：橙描边，和实心 CTA 区分开 */
.nav-work {
  color: #ffb066 !important; font-weight: 600;
  border: 1px solid rgba(255,107,0,.55); background: rgba(255,107,0,.12);
}
.nav-work::after { content: " ↗"; font-size: 12px; opacity: .8; }
.nav-work:hover { background: rgba(255,107,0,.26) !important; color: #ffd0a3 !important; }

.nav-toggle {
  display: none; width: 44px; height: 44px; flex: none;
  background: transparent; border: 1px solid rgba(255,255,255,.22);
  border-radius: 10px; cursor: pointer; padding: 0;
}
.nav-toggle span {
  display: block; width: 20px; height: 2px; margin: 4px auto;
  background: #fff; transition: transform .2s, opacity .2s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ===================== Hero ===================== */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(160deg, #0b1a24 0%, #14303f 55%, #0d3d63 100%);
  color: #fff; padding: 88px 0 96px;
}
.hero-grid-bg {
  position: absolute; inset: 0; opacity: .16; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,.35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.35) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 70% 30%, #000 0%, transparent 72%);
  -webkit-mask-image: radial-gradient(ellipse at 70% 30%, #000 0%, transparent 72%);
}
.hero-inner {
  position: relative;
  display: grid; grid-template-columns: 1.05fr .95fr;
  gap: 56px; align-items: center;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; letter-spacing: .06em; color: rgba(255,255,255,.78);
  background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.16);
  padding: 6px 14px; border-radius: 999px; margin-bottom: 22px;
}
.eyebrow .dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 0 4px rgba(255,107,0,.25);
}
.hero h1 { font-size: clamp(30px, 4.6vw, 52px); font-weight: 800; margin-bottom: 20px; }
.hero h1 .hl {
  color: #ffb066;
  background: linear-gradient(transparent 68%, rgba(255,107,0,.35) 0);
}
.lede {
  font-size: clamp(15px, 1.6vw, 18px); color: rgba(255,255,255,.84);
  max-width: 46ch; margin-bottom: 30px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 30px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.hero-tags li {
  font-size: 13px; padding: 5px 12px; border-radius: 6px;
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.16);
  color: rgba(255,255,255,.86);
}
.hero-art svg { width: 100%; height: auto; filter: drop-shadow(0 22px 44px rgba(0,0,0,.4)); }

/* ===================== 按钮 ===================== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px; font-size: 15px; font-weight: 600;
  border: 1px solid transparent; cursor: pointer; transition: transform .15s, box-shadow .15s, background .15s;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 8px 20px rgba(255,107,0,.3); }
.btn-primary:hover { background: #ff8124; }
.btn-ghost { background: rgba(255,255,255,.06); color: #fff; border-color: rgba(255,255,255,.35); }
.btn-ghost:hover { background: rgba(255,255,255,.14); }
.btn-block { width: 100%; }

/* ===================== 数据条 ===================== */
.stats { background: var(--ink); color: #fff; padding: 0; }
.stats-inner {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid rgba(255,255,255,.12);
}
.stat { padding: 30px 16px; text-align: center; }
.stat + .stat { border-left: 1px solid rgba(255,255,255,.12); }
.stat strong {
  display: block; font-size: 32px; font-weight: 800; color: var(--accent);
  font-family: var(--mono); letter-spacing: -.02em;
}
.stat span { font-size: 14px; color: rgba(255,255,255,.7); }

/* ===================== 通用区块 ===================== */
.section { padding: 88px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { max-width: 660px; margin-bottom: 48px; }
.kicker {
  font-size: 13px; font-weight: 700; letter-spacing: .18em;
  color: var(--brand); text-transform: uppercase; margin-bottom: 12px;
}
.section-head h2 { font-size: clamp(24px, 3vw, 34px); font-weight: 800; }
.section-sub { color: var(--text-soft); font-size: 17px; margin-bottom: 0; }

/* ===================== 卡片 ===================== */
.cards {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px;
}
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 26px; box-shadow: var(--shadow);
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: #c3ced7; }
.card-ico {
  display: inline-flex; align-items: center; justify-content: center;
  width: 46px; height: 46px; border-radius: 11px; margin-bottom: 16px;
  background: linear-gradient(145deg, var(--brand), var(--brand-dark));
  color: #fff;
}
.card-ico svg { width: 23px; height: 23px; }
.card h3 { font-size: 19px; }
.card p { color: var(--text-soft); font-size: 15px; }
.card-list { margin-top: 14px; padding-top: 14px; border-top: 1px dashed var(--line); }
.card-list li { font-size: 14px; color: var(--text-soft); padding-left: 18px; position: relative; }
.card-list li::before {
  content: ""; position: absolute; left: 2px; top: 11px;
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
}

/* ===================== 作品 ===================== */
.works { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.work {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow); display: flex; flex-direction: column;
}
.work-thumb {
  height: 168px; display: flex; align-items: flex-end; padding: 16px;
  font-family: var(--mono); font-size: 15px; color: #fff; letter-spacing: .04em;
}
.work-thumb-a { background: linear-gradient(140deg, #0d5fa8, #0b1a24); }
.work-thumb-b { background: linear-gradient(140deg, #ff6b00, #7a2d00); }
.work-thumb-c { background: linear-gradient(140deg, #1c2b36, #0d3d63); }
.work-thumb span {
  background: rgba(0,0,0,.35); padding: 4px 12px; border-radius: 6px;
  border: 1px solid rgba(255,255,255,.25);
}
.work-body { padding: 22px 24px 26px; display: flex; flex-direction: column; flex: 1; }
.work-body h3 { font-size: 18px; }
.work-body p { color: var(--text-soft); font-size: 15px; flex: 1; }
.link { font-weight: 600; font-size: 15px; }
.link:hover { text-decoration: none; color: var(--accent); }

/* ===================== 作品动态渲染（content.json） ===================== */
.works-filter { display: flex; flex-wrap: wrap; gap: 10px; margin: 26px 0 24px; }
.works-filter:empty { display: none; }
.works-chip {
  padding: 7px 18px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--card); color: var(--text-soft); font-size: 14px; font-weight: 600;
  cursor: pointer; transition: all .18s;
}
.works-chip:hover { border-color: var(--accent); color: var(--accent); }
.works-chip.active { background: var(--ink); border-color: var(--ink); color: #fff; }

.work-cover {
  height: 168px; background: #0d1b26 center/cover no-repeat; position: relative;
  display: flex; align-items: flex-end; padding: 16px;
}
.work-cover::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(6,14,20,.72), rgba(6,14,20,.05) 55%);
}
.work-cover .work-cover-cat {
  position: relative; z-index: 1;
  background: rgba(0,0,0,.4); padding: 4px 12px; border-radius: 6px;
  border: 1px solid rgba(255,255,255,.25); color: #fff;
  font-family: var(--mono); font-size: 13px; letter-spacing: .04em;
}
.work-pin {
  position: absolute; top: 12px; right: 12px; z-index: 1;
  background: var(--accent); color: #fff; font-size: 12px; font-weight: 700;
  padding: 3px 10px; border-radius: 999px;
}
.work-meta {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
  font-size: 13px; color: #7c8b9c; font-family: var(--mono); margin-top: 4px;
}
.work-tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0 4px; }
.work-tags span {
  font-size: 12px; color: var(--text-soft); background: #f0f4f8;
  border: 1px solid var(--line); padding: 2px 9px; border-radius: 4px;
}
.works-empty {
  grid-column: 1 / -1; text-align: center; color: var(--text-soft);
  padding: 48px 0; font-size: 15px;
}

.platforms { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 28px; }
.platform-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; }
.platform {
  display: flex; flex-direction: column; gap: 2px; padding: 18px 22px;
  background: var(--ink); color: #fff; border-radius: var(--radius-sm);
  transition: background .2s, transform .2s;
}
.platform:hover { text-decoration: none; background: var(--steel); transform: translateY(-2px); }
.platform strong { font-size: 16px; }
.platform span { font-size: 13px; color: rgba(255,255,255,.62); font-family: var(--mono); }
.platform-static { opacity: .82; cursor: default; }

/* ===================== 常用网站 ===================== */
.site-group-title {
  font-size: 13px; font-weight: 700; color: var(--text-soft);
  letter-spacing: .1em; margin: 30px 0 14px;
}
.site-group-title:first-child { margin-top: 0; }
.site-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(215px, 1fr)); gap: 14px; }
.site-card {
  display: flex; align-items: center; gap: 14px; padding: 15px 18px;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-sm);
  transition: border-color .2s, transform .2s, box-shadow .2s;
}
.site-card:hover {
  border-color: var(--accent); transform: translateY(-2px);
  text-decoration: none; box-shadow: var(--shadow);
}
.site-icon {
  width: 42px; height: 42px; flex: none;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-alt); border-radius: 10px; font-size: 20px; line-height: 1;
}
.site-card .site-name { display: block; font-size: 15px; font-weight: 600; color: var(--text); }
.site-card .site-desc { display: block; font-size: 12.5px; color: var(--text-soft); margin-top: 2px; }

/* 拖拽排序样式 */
.site-grid[data-draggable="true"] { cursor: grab; }
.site-grid[data-draggable="true"]:active { cursor: grabbing; }
.site-card.dragging { opacity: 0.4; transform: scale(0.96); }
.site-card.sortable-chosen { box-shadow: 0 4px 16px rgba(0,0,0,.18); transform: scale(1.03); }
.site-card.sortable-ghost { opacity: 0.35; border-color: var(--accent) !important; }

/* 搜索框 */
.site-search-wrap { margin-bottom: 20px; }
.site-search {
  width: 100%; padding: 12px 16px; font-size: 15px;
  border: 1.5px solid var(--line); border-radius: var(--radius-sm);
  background: var(--card); color: var(--text);
  transition: border-color .2s, box-shadow .2s;
  outline: none;
}
.site-search:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(30,183,69,.12);
}
.site-search::placeholder { color: var(--mut); }
.site-search-hint {
  display: block; font-size: 12px; color: var(--mut); margin-top: 6px;
}

/* ===================== 关于 ===================== */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start; }
.about-copy h2 { font-size: clamp(24px, 3vw, 34px); font-weight: 800; }
.about-copy p { color: var(--text-soft); font-size: 16.5px; }

.timeline { position: relative; padding-left: 26px; }
.timeline::before {
  content: ""; position: absolute; left: 6px; top: 10px; bottom: 10px;
  width: 2px; background: var(--line);
}
.timeline li { position: relative; padding-bottom: 30px; }
.timeline li::before {
  content: ""; position: absolute; left: -26px; top: 8px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--card); border: 3px solid var(--brand);
}
.tl-year {
  display: inline-block; font-family: var(--mono); font-size: 13px;
  color: var(--accent); font-weight: 700; letter-spacing: .06em;
}
.timeline strong { display: block; font-size: 17px; margin-top: 2px; }
.timeline p { font-size: 15px; color: var(--text-soft); margin: 4px 0 0; }

/* ===================== 联系 ===================== */
.contact-grid { display: grid; grid-template-columns: 1fr .95fr; gap: 56px; align-items: start; }
.contact-grid h2 { font-size: clamp(24px, 3vw, 34px); font-weight: 800; }
.contact-list { margin-top: 26px; display: grid; gap: 12px; }
.contact-list li { display: flex; gap: 10px; align-items: flex-start; color: var(--text-soft); }
.contact-list span { color: var(--brand); flex: none; }
.contact-list svg { width: 17px; height: 17px; margin-top: 5px; }

.contact-form {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px; box-shadow: var(--shadow);
}
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 7px; }
.field input, .field select, .field textarea {
  width: 100%; padding: 12px 14px; font: inherit; font-size: 15px;
  color: var(--text); background: #fbfcfd;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  transition: border-color .15s, box-shadow .15s;
}
.field textarea { resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(13,95,168,.16);
}
.field input:user-invalid, .field textarea:user-invalid { border-color: #d33; }
.form-note { font-size: 13px; color: var(--text-soft); margin: 12px 0 0; }
.form-note.error { color: #c0392b; font-weight: 600; }
.form-note.ok { color: #1e7d4f; font-weight: 600; }

/* ===================== 页脚 ===================== */
.site-footer { background: var(--ink); color: rgba(255,255,255,.72); padding: 46px 0 34px; }
.footer-inner {
  display: flex; flex-wrap: wrap; gap: 24px; align-items: center; justify-content: space-between;
}
.footer-brand strong { display: block; color: #fff; font-size: 17px; margin-bottom: 4px; }
.footer-brand p { font-size: 14px; margin: 0; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 20px; }
.footer-nav a { color: rgba(255,255,255,.72); font-size: 14px; }
.footer-nav a:hover { color: #fff; }
.copyright {
  width: 100%; margin: 8px 0 0; padding-top: 20px; font-size: 13px;
  border-top: 1px solid rgba(255,255,255,.12); color: rgba(255,255,255,.5);
}

/* ===================== 回到顶部 ===================== */
.to-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 90;
  width: 46px; height: 46px; border: none; border-radius: 50%;
  background: var(--ink); color: #fff; font-size: 19px; cursor: pointer;
  box-shadow: 0 8px 22px rgba(11,26,36,.3);
  transition: transform .18s, opacity .18s;
}
.to-top:hover { transform: translateY(-3px); background: var(--brand); }

/* ===================== 现场纪实 ===================== */
.cases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.case {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  border-top: 3px solid var(--brand); padding: 26px 24px; box-shadow: var(--shadow);
  transition: transform .2s, box-shadow .2s;
}
.case:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.case-head { display: flex; flex-direction: column; gap: 10px; }
.case-tag {
  align-self: flex-start; font-size: 12px; font-weight: 700; letter-spacing: .08em;
  color: #fff; background: var(--accent); padding: 3px 11px; border-radius: 999px;
}
.case-head h3 { font-size: 18px; margin: 0; }
.case-meta {
  font-size: 13px; font-family: var(--mono); color: var(--text-soft);
  margin: 8px 0 18px;
}
.case-steps { margin: 0; display: grid; gap: 14px; }
.case-steps > div { position: relative; padding-left: 52px; }
.case-steps dt {
  position: absolute; left: 0; top: 2px; width: 40px;
  font-size: 12px; font-weight: 700; text-align: center; color: var(--brand);
  border: 1px solid var(--brand); border-radius: 6px; padding: 0 0 1px;
}
.case-steps dd { margin: 0; font-size: 14.5px; color: var(--text-soft); }

/* ===================== 公开课 ===================== */
.course-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: start; }
.course-copy h2 { font-size: clamp(24px, 3vw, 34px); font-weight: 800; }
.course-outline { display: grid; gap: 14px; margin-top: 26px; }
.course-outline li { display: flex; gap: 14px; align-items: flex-start; }
.course-outline span {
  flex: none; width: 34px; height: 34px; border-radius: 9px;
  display: grid; place-items: center;
  font-family: var(--mono); font-size: 13px; font-weight: 700;
  color: #fff; background: var(--ink);
}
.course-outline strong { display: block; font-size: 16px; }
.course-outline p { font-size: 14px; color: var(--text-soft); margin: 2px 0 0; }

.course-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 26px; box-shadow: var(--shadow-lg);
}
.course-form {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .06em;
  color: var(--accent); background: rgba(255,107,0,.1);
  padding: 4px 12px; border-radius: 999px; margin-bottom: 12px;
}
.course-card h3 { font-size: 21px; }
.course-meta { display: grid; margin-bottom: 22px; border-top: 1px solid var(--line); }
.course-meta li {
  display: flex; justify-content: space-between; gap: 12px; align-items: baseline;
  padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 14.5px;
}
.course-meta span { color: var(--text-soft); flex: none; }
.course-meta strong { font-weight: 600; text-align: right; }
.course-tip { font-size: 13px; color: var(--text-soft); margin: 14px 0 0; }

/* ===================== 二维码卡片 ===================== */
.qr-card {
  display: flex; flex-wrap: wrap; gap: 16px; align-items: center;
  margin-top: 24px; padding: 16px;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
}
.qr-card img {
  width: 96px; height: 96px; flex: none;
  border: 1px solid var(--line); border-radius: 8px; background: #fbfcfd;
}
.qr-text strong { display: block; font-size: 15px; }
.qr-text span { font-size: 13.5px; color: var(--text-soft); }

/* ===================== 滚动渐显（渐进增强）=====================
   默认完全可见；只有 JS 可用（<html> 带 .js-reveal）时才隐藏待入场，
   保证脚本失效、被拦截或爬虫抓取时内容始终可读。 */
.reveal { transition: opacity .55s ease, transform .55s ease; }
.js-reveal .reveal { opacity: 0; transform: translateY(22px); }
.js-reveal .reveal.is-in { opacity: 1; transform: none; }

/* ===================== 响应式 ===================== */
@media (max-width: 1079px) {
  .cards, .works, .platforms, .cases { grid-template-columns: repeat(2, 1fr); }
  .hero-inner { grid-template-columns: 1fr; gap: 36px; }
  .hero-art { max-width: 520px; }
  .about-grid, .contact-grid, .course-grid { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .nav {
    position: absolute; top: 68px; left: 0; right: 0;
    background: var(--ink); border-top: 1px solid rgba(255,255,255,.12);
    box-shadow: 0 18px 32px rgba(0,0,0,.28);
    max-height: 0; overflow: hidden; transition: max-height .28s ease;
  }
  .nav.is-open { max-height: 320px; }
  .nav ul { flex-direction: column; align-items: stretch; padding: 10px 24px 18px; gap: 2px; }
  .nav a { padding: 12px 6px; border-radius: 8px; font-size: 16px; }
  .nav-cta { margin-top: 8px; text-align: center; }
}

@media (max-width: 719px) {
  .section { padding: 64px 0; }
  .hero { padding: 64px 0 72px; }
  .cards, .works, .platforms, .cases { grid-template-columns: 1fr; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3) { border-left: none; }
  .stat:nth-child(n+3) { border-top: 1px solid rgba(255,255,255,.12); }
  .stat strong { font-size: 27px; }
  .contact-form { padding: 24px 20px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

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

@media print {
  .site-header, .to-top, .hero-actions { display: none; }
}

/* ===== 服务区域地图 ===== */
.map-wrap { border-radius: 12px; overflow: hidden; box-shadow: var(--shadow); }
.map-wrap > div { width: 100%; height: 520px; }
.map-container { display: flex; flex-direction: column; gap: 16px; }
.map-clock {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}
.clock-time {
  font-size: 24px;
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  letter-spacing: 2px;
}
.clock-date {
  font-size: 14px;
  color: var(--text-soft);
}