/* ============================================================
   京峰教育 · 企业技术外包服务（waibao.jfedu.net）
   沿用 jfedu.net 主站品牌设计：
   - 深色科技底 #060912 + 卡片面 #0f1528
   - 主色：蓝 #4f7cff / 紫 #a855f7 / 青 #06b6d4
   - 渐变：linear-gradient(135deg,#4f7cff,#a855f7,#06b6d4)
   - 字体：Sora(标题) + Noto Sans SC(正文)
   ============================================================ */

:root {
  --bg: #060912;
  --bg-2: #0a0f1e;
  --surface: #0f1528;
  --surface-2: #141b35;
  --glass: rgba(255,255,255,.035);
  --glass-2: rgba(255,255,255,.06);
  --border: rgba(255,255,255,.08);
  --border-2: rgba(255,255,255,.12);

  --blue: #4f7cff;
  --purple: #a855f7;
  --cyan: #06b6d4;
  --pink: #ec4899;
  --green: #22c55e;
  --orange: #f97316;
  --gold: #eab308;
  --text: #eaf0fa;
  --text-2: #b0b9cf;
  --text-3: #7c8aa8;

  --grad: linear-gradient(135deg,#4f7cff 0%,#a855f7 50%,#06b6d4 100%);
  --grad-brand: linear-gradient(120deg,#4f6bff 0%,#8b5cf6 50%,#5fe2f4 100%);
  --grad-blue: linear-gradient(135deg,#4f7cff,#06b6d4);
  --grad-purple: linear-gradient(135deg,#a855f7,#ec4899);

  --shadow: 0 20px 60px rgba(0,0,0,.5);
  --shadow-glow: 0 0 40px rgba(79,124,255,.15);

  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --font-display: 'Sora', system-ui, -apple-system, sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, Menlo, Consolas, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

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

a { color: var(--blue); text-decoration: none; transition: color .2s; }
a:hover { color: #8aa6ff; }

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

.wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* 背景科技感装饰 */
body::before {
  content: "";
  position: fixed; top: 0; left: 0; right: 0; height: 600px;
  background:
    radial-gradient(circle at 18% 18%, rgba(79,124,255,.18), transparent 50%),
    radial-gradient(circle at 82% 0%, rgba(168,85,247,.15), transparent 50%),
    radial-gradient(circle at 50% 0%, rgba(6,182,212,.10), transparent 60%);
  pointer-events: none; z-index: 0;
}

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(6,9,18,.7);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  height: 72px; display: flex; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 12px; color: var(--text) !important; }
.brand:hover { color: var(--text) !important; }
.brand img { height: 38px; }
.brand .name {
  font-family: var(--font-display);
  font-size: 19px; font-weight: 700; letter-spacing: -.01em;
  background: var(--grad-brand); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.brand .sub {
  font-size: 12px; color: var(--text-3); margin-left: 8px; padding-left: 10px;
  border-left: 1px solid var(--border); font-weight: 500; letter-spacing: .04em;
}
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  padding: 9px 16px; border-radius: 8px;
  color: var(--text-2); font-size: 15px; font-weight: 500;
}
.nav-links a:hover { background: var(--glass-2); color: var(--text); }
.nav-links a.active {
  color: var(--text); background: var(--glass-2); font-weight: 600;
  box-shadow: inset 0 0 0 1px var(--border-2);
}
.nav-cta {
  margin-left: 10px; padding: 9px 18px !important;
  background: var(--grad) !important; color: #fff !important;
  border-radius: 8px !important; font-weight: 600 !important;
  box-shadow: 0 4px 14px rgba(79,124,255,.28);
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 8px 22px rgba(79,124,255,.4); }

.nav-toggle {
  display: none; background: none; border: 1px solid var(--border);
  border-radius: 8px; padding: 8px 12px; cursor: pointer; font-size: 18px; color: var(--text);
}

/* ---------- 通用区块 ---------- */
.section { padding: 96px 0; position: relative; }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 56px; position: relative; }
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: .12em;
  color: #fff; background: var(--grad); padding: 6px 16px;
  border-radius: 999px; margin-bottom: 18px; text-transform: uppercase;
  box-shadow: 0 4px 14px rgba(79,124,255,.28);
}
h1, h2, h3 {
  font-family: var(--font-display); line-height: 1.25;
  color: var(--text); font-weight: 700; letter-spacing: -.015em;
}
h1 { font-size: 52px; }
h2 { font-size: 38px; }
h3 { font-size: 22px; }
.section-head p { color: var(--text-2); font-size: 17px; margin-top: 18px; line-height: 1.7; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px; justify-content: center;
  padding: 14px 28px; border-radius: 10px;
  font-family: var(--font-body); font-size: 16px; font-weight: 600;
  cursor: pointer; border: 1px solid transparent; transition: all .22s;
  letter-spacing: .02em;
}
.btn-primary {
  background: var(--grad); color: #fff !important;
  box-shadow: 0 6px 18px rgba(79,124,255,.28);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(79,124,255,.42); color: #fff !important; }
.btn-ghost {
  background: var(--glass-2); color: var(--text) !important;
  border-color: var(--border-2);
}
.btn-ghost:hover { background: rgba(255,255,255,.12); color: var(--text) !important; transform: translateY(-1px); }
.btn-lg { padding: 17px 36px; font-size: 17px; }

/* ---------- Hero ---------- */
.hero {
  padding: 110px 0 90px; position: relative;
}
.hero-inner { position: relative; z-index: 2; }
.hero-grid {
  display: grid; grid-template-columns: 1.2fr .8fr; gap: 64px; align-items: center;
}
.hero h1 { font-size: 56px; margin-bottom: 24px; }
.hero h1 .grad {
  background: var(--grad-brand); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.hero-sub { font-size: 19px; color: var(--text-2); margin-bottom: 36px; max-width: 600px; line-height: 1.7; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 36px; }
.hero-trust {
  display: flex; align-items: center; gap: 24px; flex-wrap: wrap;
  padding-top: 28px; border-top: 1px solid var(--border);
}
.trust-stat .v {
  font-family: var(--font-display); font-size: 28px; font-weight: 800;
  background: var(--grad-brand); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent; line-height: 1;
}
.trust-stat .k { font-size: 13px; color: var(--text-3); margin-top: 4px; letter-spacing: .03em; }

/* Hero 右侧面板 */
.hero-card {
  background: var(--glass); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 30px;
  box-shadow: var(--shadow); position: relative;
  backdrop-filter: blur(20px);
}
.hero-card::before {
  content: ""; position: absolute; inset: -1px; border-radius: inherit;
  background: var(--grad); opacity: .2; z-index: -1; filter: blur(30px);
}
.hero-card h4 { font-family: var(--font-display); font-size: 15px; color: var(--text-3); margin-bottom: 22px; letter-spacing: .06em; text-transform: uppercase; }
.svc-row { display: flex; justify-content: space-between; padding: 13px 0; border-bottom: 1px dashed var(--border); }
.svc-row:last-child { border-bottom: none; }
.svc-row .k { color: var(--text-2); font-size: 14.5px; }
.svc-row .v { font-weight: 600; color: var(--text); font-size: 14.5px; }
.svc-row .v.ok { color: var(--green); }

/* ---------- 卡片 ---------- */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--glass); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px; transition: all .22s; height: 100%;
  position: relative; backdrop-filter: blur(8px);
}
.card:hover {
  border-color: var(--border-2); transform: translateY(-4px);
  box-shadow: 0 20px 50px rgba(79,124,255,.15);
  background: var(--glass-2);
}
.card-ico {
  width: 54px; height: 54px; border-radius: 14px; display: grid; place-items: center;
  font-size: 25px; margin-bottom: 20px;
  background: linear-gradient(135deg, rgba(79,124,255,.18), rgba(168,85,247,.18));
  color: var(--blue); border: 1px solid var(--border-2);
}
.card-ico.purple { background: linear-gradient(135deg, rgba(168,85,247,.18), rgba(236,72,153,.18)); color: var(--purple); }
.card-ico.cyan { background: linear-gradient(135deg, rgba(6,182,212,.18), rgba(79,124,255,.18)); color: var(--cyan); }
.card-ico.green { background: linear-gradient(135deg, rgba(34,197,94,.18), rgba(6,182,212,.18)); color: var(--green); }
.card h3 { margin-bottom: 12px; font-family: var(--font-display); }
.card p { color: var(--text-2); font-size: 15px; }
.card ul { list-style: none; margin-top: 16px; }
.card ul li {
  position: relative; padding-left: 22px; color: var(--text-2); font-size: 14.5px;
  margin-bottom: 9px;
}
.card ul li::before {
  content: "→"; position: absolute; left: 0; color: var(--blue); font-weight: 700;
}

/* ---------- 服务能力（带光晕） ---------- */
.service {
  background: linear-gradient(180deg, var(--surface), var(--bg-2));
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 36px; transition: all .25s; position: relative; overflow: hidden;
}
.service::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: var(--grad); transform: scaleX(0); transform-origin: left;
  transition: transform .35s;
}
.service:hover { transform: translateY(-6px); border-color: var(--border-2); }
.service:hover::before { transform: scaleX(1); }
.service .num {
  font-family: var(--font-display); font-size: 14px; color: var(--blue);
  font-weight: 700; letter-spacing: .12em; margin-bottom: 14px;
}
.service h3 { margin-bottom: 12px; font-size: 24px; }
.service p { color: var(--text-2); font-size: 15px; margin-bottom: 18px; }
.service ul { list-style: none; }
.service ul li { padding: 7px 0; color: var(--text-2); font-size: 14.5px; position: relative; padding-left: 22px; }
.service ul li::before { content: "✓"; position: absolute; left: 0; color: var(--green); font-weight: 700; }

/* ---------- 流程 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.step {
  background: var(--glass); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; transition: all .22s; position: relative;
}
.step:hover { transform: translateY(-4px); border-color: var(--border-2); background: var(--glass-2); }
.step-num {
  width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center;
  background: var(--grad); color: #fff; font-family: var(--font-display);
  font-weight: 800; font-size: 18px; margin-bottom: 18px;
  box-shadow: 0 4px 14px rgba(79,124,255,.28);
}
.step h3 { font-size: 18px; margin-bottom: 10px; font-family: var(--font-display); }
.step p { color: var(--text-2); font-size: 14.5px; }

/* ---------- 报价 ---------- */
.price-card {
  background: linear-gradient(180deg, var(--surface), var(--bg-2));
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 36px; display: flex; flex-direction: column; transition: all .22s;
  position: relative; height: 100%;
}
.price-card:hover { border-color: var(--border-2); transform: translateY(-6px); box-shadow: 0 24px 60px rgba(79,124,255,.18); }
.price-card.featured { border: 1px solid transparent; background: linear-gradient(180deg, rgba(79,124,255,.10), var(--bg-2)); }
.price-card.featured::before {
  content: ""; position: absolute; inset: 0; padding: 1px;
  border-radius: inherit; background: var(--grad); -webkit-mask:
  linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude; pointer-events: none;
}
.price-tag {
  position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  background: var(--grad); color: #fff; font-size: 12px; font-weight: 700;
  padding: 5px 16px; border-radius: 999px; white-space: nowrap;
  box-shadow: 0 4px 14px rgba(79,124,255,.4);
}
.price-card h3 { font-size: 22px; margin-bottom: 8px; font-family: var(--font-display); }
.price-card .desc { color: var(--text-2); font-size: 14.5px; margin-bottom: 22px; }
.price-num {
  font-family: var(--font-display); font-size: 40px; font-weight: 800; color: var(--text);
  line-height: 1.1; letter-spacing: -.02em;
}
.price-num small { font-size: 15px; font-weight: 500; color: var(--text-3); }
.price-note { color: var(--text-3); font-size: 13px; margin: 8px 0 22px; }
.price-card ul { list-style: none; margin-bottom: 26px; flex: 1; }
.price-card ul li {
  position: relative; padding-left: 22px; font-size: 14.5px; color: var(--text-2);
  margin-bottom: 11px;
}
.price-card ul li::before { content: "✓"; position: absolute; left: 0; color: var(--green); font-weight: 700; }
.price-card ul li.no { color: var(--text-3); }
.price-card ul li.no::before { content: "—"; color: var(--text-3); }

/* 表格 */
.tbl-wrap {
  overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--glass);
}
table { width: 100%; border-collapse: collapse; background: transparent; font-size: 15px; min-width: 580px; }
th, td { padding: 16px 20px; text-align: left; border-bottom: 1px solid var(--border); color: var(--text-2); }
th { background: var(--glass-2); font-weight: 700; color: var(--text); font-size: 14px; font-family: var(--font-display); letter-spacing: .02em; }
tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--glass-2); }
td .price { font-weight: 700; color: var(--blue); white-space: nowrap; }

/* ---------- 案例 ---------- */
.case {
  background: linear-gradient(180deg, var(--surface), var(--bg-2));
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: hidden; transition: all .25s; display: flex; flex-direction: column;
}
.case:hover { border-color: var(--border-2); transform: translateY(-6px); box-shadow: 0 24px 50px rgba(79,124,255,.15); }
.case-top { padding: 26px 28px 0; }
.case-tag {
  display: inline-block; font-size: 12px; font-weight: 700; padding: 5px 12px;
  border-radius: 999px; background: var(--glass-2); color: var(--blue);
  margin-bottom: 16px; border: 1px solid var(--border);
}
.case-tag.green { color: var(--green); }
.case-tag.purple { color: var(--purple); }
.case-tag.cyan { color: var(--cyan); }
.case h3 { margin-bottom: 12px; }
.case .body { padding: 0 28px; color: var(--text-2); font-size: 14.5px; flex: 1; line-height: 1.7; }
.case .stack { padding: 18px 28px 0; display: flex; flex-wrap: wrap; gap: 7px; }
.chip {
  font-size: 12.5px; background: var(--glass-2); color: var(--text-2);
  padding: 5px 12px; border-radius: 6px; font-weight: 500;
  border: 1px solid var(--border);
}
.case .result {
  margin: 20px 28px 28px; padding: 14px 18px; background: rgba(34,197,94,.08);
  border-radius: 10px; font-size: 14px; color: var(--green);
  border-left: 2px solid var(--green); font-weight: 500;
}

/* ---------- CTA 横幅 ---------- */
.cta-band {
  background: linear-gradient(135deg, rgba(79,124,255,.15), rgba(168,85,247,.10), rgba(6,182,212,.15));
  border: 1px solid var(--border-2); border-radius: var(--radius-xl);
  padding: 64px 48px; text-align: center; position: relative; overflow: hidden;
}
.cta-band::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 30% 50%, rgba(79,124,255,.20), transparent 60%),
    radial-gradient(circle at 70% 50%, rgba(168,85,247,.15), transparent 60%);
  z-index: 0;
}
.cta-band > * { position: relative; z-index: 1; }
.cta-band h2 { font-size: 36px; margin-bottom: 16px; }
.cta-band p { color: var(--text-2); font-size: 17px; margin-bottom: 32px; }
.cta-band .hero-actions { justify-content: center; margin-bottom: 0; }

/* ---------- 联系页 ---------- */
.contact-card {
  background: var(--glass); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px; display: flex; gap: 20px; align-items: flex-start; transition: all .22s;
  backdrop-filter: blur(8px);
}
.contact-card:hover { border-color: var(--border-2); transform: translateY(-3px); background: var(--glass-2); }
.contact-ico {
  width: 56px; height: 56px; border-radius: 14px; display: grid; place-items: center;
  font-size: 26px; background: linear-gradient(135deg, rgba(79,124,255,.18), rgba(168,85,247,.18));
  border: 1px solid var(--border-2); color: var(--blue); flex-shrink: 0;
}
.contact-ico.green { background: linear-gradient(135deg, rgba(34,197,94,.18), rgba(6,182,212,.18)); color: var(--green); }
.contact-card .lbl { font-size: 13px; color: var(--text-3); font-weight: 600; margin-bottom: 6px; letter-spacing: .04em; text-transform: uppercase; }
.contact-card .val { font-family: var(--font-display); font-size: 22px; font-weight: 700; color: var(--text); letter-spacing: .01em; }
.contact-card .hint { font-size: 14px; color: var(--text-2); margin-top: 8px; }
.copy-btn {
  margin-top: 14px; font-size: 13px; padding: 7px 16px; border-radius: 7px;
  border: 1px solid var(--border-2); background: var(--glass-2); color: var(--text-2); cursor: pointer;
  transition: all .18s; font-weight: 600; font-family: var(--font-body);
}
.copy-btn:hover { border-color: var(--blue); color: var(--blue); background: rgba(79,124,255,.12); }
.copy-btn.copied { border-color: var(--green); color: var(--green); background: rgba(34,197,94,.12); }

/* 二维码卡 */
.qr-card {
  background: var(--glass); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px; text-align: center; backdrop-filter: blur(8px);
}
.qr-card img {
  width: 220px; height: 220px; margin: 0 auto 16px;
  border-radius: 12px; background: #fff; padding: 8px;
  box-shadow: 0 12px 40px rgba(79,124,255,.25);
}
.qr-card .lbl { font-size: 15px; color: var(--text-2); margin-bottom: 6px; }
.qr-card .val { font-family: var(--font-display); font-size: 22px; font-weight: 700; color: var(--text); }
.qr-card .hint { font-size: 13.5px; color: var(--text-3); margin-top: 10px; }

/* 表单 */
.form-card { background: var(--glass); border: 1px solid var(--border); border-radius: var(--radius); padding: 36px; backdrop-filter: blur(8px); }
.field { margin-bottom: 20px; }
.field label { display: block; font-size: 14.5px; font-weight: 600; color: var(--text); margin-bottom: 10px; }
.field input, .field select, .field textarea {
  width: 100%; padding: 13px 16px; border: 1px solid var(--border); border-radius: 8px;
  font-family: var(--font-body); font-size: 15px; color: var(--text);
  background: var(--bg-2); transition: all .18s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px rgba(79,124,255,.15);
}
.field textarea { resize: vertical; min-height: 130px; }
.form-note { font-size: 13.5px; color: var(--text-3); margin-top: 16px; }

/* ---------- 关于页 ---------- */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.skill-group { margin-bottom: 28px; }
.skill-group h4 { font-size: 15px; color: var(--text); margin-bottom: 14px; font-weight: 700; font-family: var(--font-display); letter-spacing: .04em; text-transform: uppercase; }
.skill-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.skill-tag {
  font-size: 13.5px; background: var(--glass-2); color: var(--text-2);
  padding: 7px 14px; border-radius: 7px; font-weight: 500; border: 1px solid var(--border);
  transition: all .18s;
}
.skill-tag:hover { border-color: var(--blue); color: var(--blue); background: rgba(79,124,255,.10); }

.timeline { position: relative; padding-left: 28px; }
.timeline::before {
  content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 2px;
  background: linear-gradient(180deg, var(--blue), var(--purple), var(--cyan));
}
.tl-item { position: relative; margin-bottom: 30px; }
.tl-item::before {
  content: ""; position: absolute; left: -28px; top: 8px; width: 14px; height: 14px;
  border-radius: 50%; background: var(--grad);
  border: 3px solid var(--bg); box-shadow: 0 0 0 3px rgba(79,124,255,.2);
}
.tl-item h4 { font-size: 17px; margin-bottom: 6px; font-family: var(--font-display); }
.tl-item .meta { font-size: 13.5px; color: var(--blue); margin-bottom: 8px; font-weight: 600; letter-spacing: .04em; }
.tl-item p { color: var(--text-2); font-size: 14.5px; }

/* ---------- 页脚 ---------- */
.footer {
  background: linear-gradient(180deg, var(--bg) 0%, #02040b 100%);
  border-top: 1px solid var(--border);
  color: var(--text-2); padding: 56px 0 28px; margin-top: 60px;
}
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 44px; margin-bottom: 40px; }
.footer .brand { margin-bottom: 16px; }
.footer p { font-size: 14.5px; line-height: 1.85; color: var(--text-3); }
.footer h4 { color: var(--text); font-size: 15px; margin-bottom: 18px; font-weight: 700; font-family: var(--font-display); letter-spacing: .04em; text-transform: uppercase; }
.footer ul { list-style: none; }
.footer ul li { margin-bottom: 11px; }
.footer ul li a { color: var(--text-2); font-size: 14.5px; transition: color .15s; }
.footer ul li a:hover { color: var(--blue); }
.footer-bottom {
  border-top: 1px solid var(--border); padding-top: 24px; text-align: center;
  font-size: 13.5px; color: var(--text-3);
}
.footer-bottom a { color: var(--text-2); }

/* ---------- 页面头部（内页） ---------- */
.page-head {
  padding: 70px 0 50px; border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(79,124,255,.06) 0%, transparent 100%);
  position: relative;
}
.page-head h1 { font-size: 44px; margin-bottom: 14px; }
.page-head p { color: var(--text-2); font-size: 17px; max-width: 720px; line-height: 1.7; }
.breadcrumb { font-size: 14px; color: var(--text-3); margin-bottom: 18px; }
.breadcrumb a { color: var(--text-3); }
.breadcrumb a:hover { color: var(--blue); }

/* ---------- 工具类 ---------- */
.center { text-align: center; }
.notice {
  background: rgba(79,124,255,.06); border: 1px solid rgba(79,124,255,.18);
  border-left: 3px solid var(--blue); border-radius: 10px;
  padding: 18px 22px; font-size: 14.5px; color: var(--text-2);
}
.notice strong { color: var(--text); }
.notice code {
  font-family: var(--font-mono); font-size: 13px;
  background: rgba(79,124,255,.12); color: var(--blue);
  padding: 2px 7px; border-radius: 4px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav-links {
    display: none; position: absolute; top: 72px; left: 0; right: 0;
    background: rgba(6,9,18,.97); border-bottom: 1px solid var(--border);
    flex-direction: column; align-items: stretch; padding: 14px 22px 22px; gap: 4px;
    backdrop-filter: blur(20px);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 13px 16px; }
  .nav-cta { margin-left: 0; text-align: center; }
  .nav-toggle { display: block; }
  h1 { font-size: 38px; }
  .hero h1 { font-size: 38px; }
  .hero { padding: 60px 0 50px; }
  .section { padding: 60px 0; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .cta-band { padding: 40px 24px; }
  .page-head h1 { font-size: 32px; }
  .brand .sub { display: none; }
}

/* 字体加载：直接从 Google Fonts 远程拉取（不打包，符合 jfedu 主站做法） */
@import url('https://fonts.googleapis.com/css2?family=Sora:wght@400;600;700;800&family=Noto+Sans+SC:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

@media print {
  .nav, .footer, .cta-band, .copy-btn { display: none !important; }
  body { font-size: 12pt; background: #fff; color: #000; }
}