/* ===== 老兵软件工作室 - 全站样式 ===== */
:root {
  --primary: #1a66ff;
  --primary-dark: #0f4fd6;
  --primary-light: #e8f0ff;
  --primary-grad: linear-gradient(135deg, #1a66ff 0%, #3d8bff 100%);
  --text: #1f2937;
  --text-sub: #5b6b82;
  --text-light: #8a97ab;
  --bg: #ffffff;
  --bg-gray: #f5f8fc;
  --bg-blue-soft: #eef4ff;
  --border: #e3eaf4;
  --shadow: 0 8px 30px rgba(26, 102, 255, 0.08);
  --shadow-hover: 0 14px 40px rgba(26, 102, 255, 0.16);
  --radius: 14px;
  --green: #10b981;
  --orange: #f59e0b;
  --red: #ef4444;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== 顶部导航 ===== */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.logo { display: flex; align-items: center; gap: 10px; font-size: 19px; font-weight: 700; }
.logo-mark {
  width: 36px; height: 36px; border-radius: 9px;
  background: var(--primary-grad);
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 800; letter-spacing: 0.5px;
}
.logo span.en { font-size: 11px; font-weight: 400; color: var(--text-light); display: block; line-height: 1.1; }
.nav { display: flex; gap: 34px; }
.nav a { font-size: 15px; color: var(--text-sub); position: relative; padding: 6px 0; transition: color .2s; }
.nav a:hover { color: var(--primary); }
.nav a.active { color: var(--primary); font-weight: 600; }
.nav a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -4px;
  height: 3px; border-radius: 2px; background: var(--primary-grad);
}
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 26px; border-radius: 8px; font-size: 15px; font-weight: 600;
  cursor: pointer; border: none; transition: all .25s;
}
.btn-primary { background: var(--primary-grad); color: #fff; box-shadow: 0 6px 18px rgba(26,102,255,.35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(26,102,255,.45); }
.btn-ghost { background: rgba(255,255,255,.14); color: #fff; border: 1px solid rgba(255,255,255,.5); }
.btn-ghost:hover { background: rgba(255,255,255,.25); }
.btn-outline { background: #fff; color: var(--primary); border: 1px solid var(--primary); }
.btn-outline:hover { background: var(--primary-light); }
.btn-sm { padding: 8px 18px; font-size: 14px; }

/* ===== Hero ===== */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, #0b3bb8 0%, #1a66ff 55%, #3d8bff 100%);
  color: #fff;
  padding: 90px 0 110px;
}
.hero::before {
  content: ""; position: absolute; inset: 0; opacity: .18;
  background-image:
    linear-gradient(rgba(255,255,255,.25) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.25) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 70% 30%, #000 0%, transparent 70%);
}
.hero::after {
  content: ""; position: absolute; right: -140px; top: -140px;
  width: 460px; height: 460px; border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,.22) 0%, transparent 70%);
}
.hero-inner { position: relative; z-index: 2; display: flex; align-items: center; gap: 48px; }
.hero-text { flex: 1.1; }
.hero-visual { flex: 0.9; display: flex; justify-content: center; }
.hero-tag {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.35);
  padding: 6px 16px; border-radius: 100px; font-size: 13px; margin-bottom: 22px;
}
.hero h1 { font-size: 42px; line-height: 1.3; font-weight: 800; margin-bottom: 18px; }
.hero h1 em { font-style: normal; color: #ffd54d; }
.hero p.sub { font-size: 17px; opacity: .92; max-width: 560px; margin-bottom: 34px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* 代码窗口视觉 */
.code-window {
  width: 100%; max-width: 460px;
  background: #0d1b3e; border-radius: 14px; overflow: hidden;
  box-shadow: 0 24px 60px rgba(4, 20, 60, .5);
  border: 1px solid rgba(255,255,255,.12);
  font-family: Consolas, "Courier New", monospace;
}
.code-window-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 12px 16px; background: rgba(255,255,255,.06);
}
.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot.r { background: #ff5f57; } .dot.y { background: #febc2e; } .dot.g { background: #28c840; }
.code-window-bar span.title { margin-left: 10px; font-size: 12px; color: #7f95c4; }
.code-body { padding: 20px 22px; font-size: 13px; line-height: 2; color: #c8d6f5; }
.code-body .k { color: #7dd3fc; } .code-body .s { color: #86efac; }
.code-body .c { color: #5f6f95; } .code-body .f { color: #fcd34d; }
.code-status {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 22px; border-top: 1px solid rgba(255,255,255,.08);
  font-size: 12px; color: #86efac;
}
.pulse { width: 8px; height: 8px; border-radius: 50%; background: #28c840; animation: pulse 1.6s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.3} }

/* ===== 信任条 ===== */
.trust-bar {
  background: #fff; border-bottom: 1px solid var(--border);
}
.trust-inner {
  display: grid; grid-template-columns: repeat(4, 1fr);
  padding: 26px 0;
}
.trust-item { display: flex; align-items: center; gap: 14px; justify-content: center; }
.trust-item .num { font-size: 26px; font-weight: 800; color: var(--primary); line-height: 1.1; }
.trust-item .num small { font-size: 14px; font-weight: 600; }
.trust-item .label { font-size: 13px; color: var(--text-sub); }

/* ===== 通用 Section ===== */
.section { padding: 84px 0; }
.section.gray { background: var(--bg-gray); }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 52px; }
.section-head .eyebrow {
  display: inline-block; color: var(--primary); font-size: 14px; font-weight: 700;
  letter-spacing: 3px; margin-bottom: 10px;
}
.section-head h2 { font-size: 32px; font-weight: 800; margin-bottom: 14px; }
.section-head p { color: var(--text-sub); font-size: 16px; }

/* ===== 服务卡片 ===== */
.card-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.card-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.card-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.svc-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px 26px; transition: all .3s; position: relative; overflow: hidden;
}
.svc-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: transparent; }
.svc-icon {
  width: 54px; height: 54px; border-radius: 13px; background: var(--primary-light);
  display: flex; align-items: center; justify-content: center; margin-bottom: 20px;
}
.svc-icon svg { width: 27px; height: 27px; stroke: var(--primary); }
.svc-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.svc-card p { font-size: 14px; color: var(--text-sub); }
.svc-card .more { display: inline-block; margin-top: 16px; color: var(--primary); font-size: 14px; font-weight: 600; }

/* ===== 页内横幅 ===== */
.page-banner {
  background: linear-gradient(135deg, #0b3bb8 0%, #1a66ff 60%, #3d8bff 100%);
  color: #fff; text-align: center; padding: 66px 0; position: relative; overflow: hidden;
}
.page-banner::before {
  content: ""; position: absolute; inset: 0; opacity: .15;
  background-image:
    linear-gradient(rgba(255,255,255,.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.3) 1px, transparent 1px);
  background-size: 44px 44px;
}
.page-banner h1 { font-size: 34px; font-weight: 800; position: relative; margin-bottom: 12px; }
.page-banner p { position: relative; opacity: .9; font-size: 16px; }

/* ===== 痛点清单 ===== */
.pain-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.pain-item {
  display: flex; gap: 16px; align-items: flex-start;
  background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 22px 24px;
  transition: all .25s;
}
.pain-item:hover { border-color: var(--primary); box-shadow: var(--shadow); }
.pain-item .mark {
  flex-shrink: 0; width: 34px; height: 34px; border-radius: 50%;
  background: #fff1f0; color: var(--red); display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 17px;
}
.pain-item h4 { font-size: 16px; margin-bottom: 4px; }
.pain-item p { font-size: 14px; color: var(--text-sub); }

/* ===== 方法论时间线 ===== */
.method-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; position: relative; }
.method-card {
  background: #fff; border-radius: var(--radius); padding: 34px 28px;
  border: 1px solid var(--border); position: relative; transition: all .3s;
}
.method-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.method-card .stage {
  position: absolute; top: -18px; left: 28px;
  background: var(--primary-grad); color: #fff; font-size: 13px; font-weight: 700;
  padding: 5px 16px; border-radius: 100px; box-shadow: 0 6px 14px rgba(26,102,255,.35);
}
.method-card h3 { font-size: 19px; margin: 14px 0 12px; }
.method-card p { font-size: 14px; color: var(--text-sub); }
.method-num {
  font-size: 52px; font-weight: 800; color: var(--primary-light);
  position: absolute; right: 20px; bottom: 6px; line-height: 1; user-select: none;
}

/* ===== 技术栈对比 ===== */
.stack-compare { display: grid; grid-template-columns: 1fr 70px 1fr; gap: 0; align-items: stretch; }
.stack-col {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 34px 30px;
}
.stack-col.new { border: 2px solid var(--primary); }
.stack-col h3 { display: flex; align-items: center; gap: 10px; font-size: 18px; margin-bottom: 20px; }
.badge { font-size: 12px; font-weight: 700; padding: 3px 12px; border-radius: 100px; }
.badge.old { background: #fff3e6; color: #d97706; }
.badge.new { background: var(--primary-light); color: var(--primary); }
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  padding: 8px 16px; border-radius: 8px; font-size: 14px; font-weight: 600;
  background: var(--bg-gray); border: 1px solid var(--border); color: var(--text-sub);
  font-family: Consolas, monospace;
}
.stack-col.new .chip { background: var(--primary-light); border-color: #c4d9ff; color: var(--primary-dark); }
.stack-arrow { display: flex; align-items: center; justify-content: center; }
.stack-arrow svg { width: 34px; height: 34px; stroke: var(--primary); }

/* ===== 案例卡片 ===== */
.filter-bar { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-bottom: 44px; }
.filter-chip {
  padding: 8px 20px; border-radius: 100px; font-size: 14px; cursor: pointer;
  border: 1px solid var(--border); background: #fff; color: var(--text-sub); transition: all .2s;
}
.filter-chip:hover { border-color: var(--primary); color: var(--primary); }
.filter-chip.active { background: var(--primary-grad); color: #fff; border-color: transparent; box-shadow: 0 4px 12px rgba(26,102,255,.3); }
.case-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; transition: all .3s; display: flex; flex-direction: column;
}
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.case-top {
  background: linear-gradient(135deg, #123f9e, #1a66ff);
  padding: 26px 28px; color: #fff; position: relative; overflow: hidden;
}
.case-top::after {
  content: ""; position: absolute; right: -30px; top: -30px;
  width: 120px; height: 120px; border-radius: 50%;
  background: rgba(255,255,255,.1);
}
.case-top h3 { font-size: 17px; font-weight: 700; position: relative; line-height: 1.5; }
.case-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; position: relative; }
.case-tags .tag {
  font-size: 12px; padding: 3px 12px; border-radius: 100px;
  background: rgba(255,255,255,.18); border: 1px solid rgba(255,255,255,.3);
}
.case-body { padding: 24px 28px; flex: 1; display: flex; flex-direction: column; gap: 14px; }
.case-block .cb-label {
  font-size: 13px; font-weight: 700; color: var(--primary);
  display: flex; align-items: center; gap: 6px; margin-bottom: 5px;
}
.case-block p { font-size: 14px; color: var(--text-sub); }
.case-result {
  background: #f0fdf6; border: 1px solid #bbf0d2; border-radius: 10px;
  padding: 12px 16px; font-size: 14px; color: #067a4b;
}
.case-quote {
  border-left: 3px solid var(--orange); background: #fffaf0;
  padding: 10px 16px; border-radius: 0 8px 8px 0; font-size: 13px; color: #92600a;
}
.case-keywords {
  border-top: 1px dashed var(--border); padding-top: 12px;
  font-size: 12px; color: var(--text-light); font-family: Consolas, monospace;
}
.case-keywords b { color: var(--primary); font-weight: 700; }

/* 定位语四宫格 */
.position-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-bottom: 50px; }
.position-item {
  background: #fff; border: 1px solid var(--border); border-radius: 12px;
  padding: 20px 22px; font-size: 14px; color: var(--text-sub); line-height: 1.8;
}
.position-item h4 { font-size: 15px; color: var(--primary); margin-bottom: 6px; }
@media (max-width: 960px) { .position-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .position-grid { grid-template-columns: 1fr; } }

/* 合作方式说明列表 */
.fit-list { list-style: none; margin-top: 6px; }
.fit-list li {
  display: flex; gap: 10px; font-size: 14px; color: var(--text-sub);
  padding: 7px 0; line-height: 1.6;
}
.fit-list li .mk { flex-shrink: 0; font-weight: 800; }
.fit-list.ok li .mk { color: var(--green); }
.fit-list.no li .mk { color: var(--red); }

/* ===== 数据亮点 ===== */
.metric-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.metric-card {
  text-align: center; background: #fff; border-radius: var(--radius);
  border: 1px solid var(--border); padding: 30px 18px;
}
.metric-card .val { font-size: 34px; font-weight: 800; color: var(--primary); }
.metric-card .val small { font-size: 16px; }
.metric-card .desc { font-size: 14px; color: var(--text-sub); margin-top: 6px; }

/* ===== 关于页：主理人 ===== */
.profile-wrap { display: flex; gap: 48px; align-items: center; }
.profile-avatar {
  flex-shrink: 0; width: 260px; height: 300px; border-radius: 18px;
  background: var(--primary-grad); position: relative; overflow: hidden;
  display: flex; align-items: flex-end; justify-content: center;
  box-shadow: var(--shadow-hover);
}
.profile-avatar .initial {
  font-size: 120px; font-weight: 800; color: rgba(255,255,255,.85); line-height: 1;
  margin-bottom: 10px;
}
.profile-avatar .badge-years {
  position: absolute; top: 18px; left: 18px;
  background: rgba(255,255,255,.95); color: var(--primary);
  font-size: 13px; font-weight: 700; padding: 6px 14px; border-radius: 100px;
}
.profile-text h2 { font-size: 28px; margin-bottom: 6px; }
.profile-text .role { color: var(--primary); font-weight: 600; margin-bottom: 20px; }
.profile-text p { color: var(--text-sub); font-size: 15px; margin-bottom: 14px; }

/* 团队 */
.team-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; }
.team-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 18px; text-align: center; transition: all .3s;
}
.team-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.team-avatar {
  width: 66px; height: 66px; border-radius: 50%; margin: 0 auto 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; font-weight: 800; color: #fff;
}
.t-blue { background: linear-gradient(135deg,#1a66ff,#5b9bff); }
.t-teal { background: linear-gradient(135deg,#0d9488,#2dd4bf); }
.t-purple { background: linear-gradient(135deg,#7c3aed,#a78bfa); }
.t-orange { background: linear-gradient(135deg,#ea580c,#fb923c); }
.t-green { background: linear-gradient(135deg,#059669,#34d399); }
.team-card h4 { font-size: 16px; margin-bottom: 4px; }
.team-card .role { font-size: 13px; color: var(--primary); font-weight: 600; margin-bottom: 8px; }
.team-card p { font-size: 13px; color: var(--text-sub); }

/* 承诺 */
.promise-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.promise-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px 26px; transition: all .3s;
}
.promise-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.promise-icon {
  width: 50px; height: 50px; border-radius: 12px; background: #f0fdf6;
  display: flex; align-items: center; justify-content: center; margin-bottom: 18px;
}
.promise-icon svg { width: 25px; height: 25px; stroke: var(--green); }
.promise-card h3 { font-size: 17px; margin-bottom: 10px; }
.promise-card p { font-size: 14px; color: var(--text-sub); }

/* ===== 联系页 ===== */
.contact-wrap { display: grid; grid-template-columns: 1fr 1.35fr; gap: 40px; align-items: start; }
.contact-info-card {
  background: var(--primary-grad); border-radius: var(--radius); color: #fff;
  padding: 38px 34px; position: relative; overflow: hidden;
}
.contact-info-card::after {
  content: ""; position: absolute; right: -60px; bottom: -60px;
  width: 200px; height: 200px; border-radius: 50%; background: rgba(255,255,255,.1);
}
.contact-info-card h3 { font-size: 20px; margin-bottom: 26px; position: relative; }
.contact-line { display: flex; gap: 14px; margin-bottom: 22px; position: relative; }
.contact-line .ci {
  width: 42px; height: 42px; border-radius: 11px; background: rgba(255,255,255,.18);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.contact-line .ci svg { width: 20px; height: 20px; stroke: #fff; }
.contact-line .cl-label { font-size: 12px; opacity: .8; }
.contact-line .cl-value { font-size: 15px; font-weight: 600; }
.contact-note {
  margin-top: 28px; background: rgba(255,255,255,.12); border: 1px dashed rgba(255,255,255,.4);
  border-radius: 10px; padding: 16px 18px; font-size: 13px; position: relative;
}
.form-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 38px 36px; box-shadow: var(--shadow);
}
.form-card h3 { font-size: 19px; margin-bottom: 6px; }
.form-card .form-tip { font-size: 14px; color: var(--text-sub); margin-bottom: 26px; }
.form-group { margin-bottom: 22px; }
.form-group label {
  display: block; font-size: 14px; font-weight: 600; margin-bottom: 9px;
}
.form-group label .req { color: var(--red); margin-left: 3px; }
.form-group input[type="text"], .form-group input[type="tel"], .form-group textarea {
  width: 100%; border: 1px solid var(--border); border-radius: 9px;
  padding: 12px 15px; font-size: 15px; font-family: inherit;
  transition: border-color .2s, box-shadow .2s; background: var(--bg-gray);
}
.form-group input:focus, .form-group textarea:focus {
  outline: none; border-color: var(--primary); background: #fff;
  box-shadow: 0 0 0 3px rgba(26,102,255,.12);
}
.form-group textarea { min-height: 110px; resize: vertical; }
.radio-group { display: flex; flex-wrap: wrap; gap: 10px; }
.radio-pill { position: relative; cursor: pointer; }
.radio-pill input { position: absolute; opacity: 0; }
.radio-pill span {
  display: inline-block; padding: 9px 18px; border-radius: 100px; font-size: 14px;
  border: 1px solid var(--border); background: var(--bg-gray); color: var(--text-sub);
  transition: all .2s;
}
.radio-pill input:checked + span {
  background: var(--primary-light); border-color: var(--primary);
  color: var(--primary); font-weight: 600;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-submit { width: 100%; padding: 15px; font-size: 16px; }
.form-privacy { text-align: center; font-size: 12px; color: var(--text-light); margin-top: 14px; }

/* ===== CTA 区 ===== */
.cta-band {
  background: linear-gradient(135deg, #0b3bb8, #1a66ff); border-radius: 20px;
  color: #fff; padding: 54px 56px; display: flex; align-items: center;
  justify-content: space-between; gap: 30px; position: relative; overflow: hidden;
}
.cta-band::before {
  content: ""; position: absolute; inset: 0; opacity: .12;
  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: 40px 40px;
}
.cta-band h2 { font-size: 26px; font-weight: 800; margin-bottom: 8px; position: relative; }
.cta-band p { opacity: .9; position: relative; }
.cta-band .btn { position: relative; flex-shrink: 0; }
.cta-band .btn-white { background: #fff; color: var(--primary); box-shadow: 0 8px 22px rgba(0,0,0,.2); }
.cta-band .btn-white:hover { transform: translateY(-2px); }

/* ===== 页脚 ===== */
.footer { background: #0c1c3f; color: #a8b6d4; margin-top: 0; }
.footer-inner {
  display: grid; grid-template-columns: 1.25fr 1fr; gap: 48px;
  padding: 34px 0 26px; align-items: center;
}
.footer h4 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.footer .f-logo { display: flex; align-items: center; gap: 10px; color: #fff; font-size: 18px; font-weight: 700; margin-bottom: 14px; }
.footer .f-logo .logo-mark { width: 32px; height: 32px; font-size: 13px; }
.footer p { font-size: 13px; line-height: 1.8; }
.footer ul { list-style: none; }
.footer ul li { margin-bottom: 9px; }
.footer ul a { font-size: 14px; color: #a8b6d4; transition: color .2s; }
.footer ul a:hover { color: #fff; }
.f-contact-row { display: flex; gap: 24px; align-items: flex-start; }
.footer .f-contact li { display: flex; gap: 10px; font-size: 13px; }
.footer .f-contact svg { width: 16px; height: 16px; stroke: #5b8cff; flex-shrink: 0; margin-top: 4px; }
.qr-box {
  width: 86px; height: 86px; flex-shrink: 0; background: #fff; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: #0c1c3f; font-size: 11px; text-align: center; overflow: hidden;
}
.qr-box img { width: 100%; height: 100%; object-fit: cover; border-radius: 10px; display: block; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1); padding: 16px 0;
  display: flex; justify-content: space-between; font-size: 13px;
}
.footer-beian {
  border-top: 1px solid rgba(255,255,255,.1); padding: 13px 0;
  display: flex; justify-content: center; align-items: center; flex-wrap: wrap;
  gap: 10px; font-size: 12px; color: #7f8db0;
}
.footer-beian a {
  color: #7f8db0; display: inline-flex; align-items: center; gap: 5px;
  transition: color .2s;
}
.footer-beian a:hover { color: #fff; }
.footer-beian img { height: 15px; width: auto; display: inline-block; }
.footer-beian .sep { opacity: .45; }

/* ===== 动画 ===== */
.reveal { opacity: 0; transform: translateY(26px); transition: all .7s ease; }
.reveal.on { opacity: 1; transform: none; }

/* ===== 响应式 ===== */
@media (max-width: 960px) {
  .nav { display: none; }
  .hero-inner, .profile-wrap, .contact-wrap { flex-direction: column; }
  .card-grid, .card-grid.cols-3, .method-steps, .promise-grid { grid-template-columns: 1fr 1fr; }
  .metric-row, .trust-inner { grid-template-columns: 1fr 1fr; row-gap: 20px; }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .pain-list { grid-template-columns: 1fr; }
  .stack-compare { grid-template-columns: 1fr; }
  .stack-arrow { padding: 14px 0; transform: rotate(90deg); }
  .cta-band { flex-direction: column; text-align: center; }
  .hero h1 { font-size: 30px; }
  .footer-inner { grid-template-columns: 1fr; gap: 24px; }
}
@media (max-width: 600px) {
  .card-grid, .card-grid.cols-3, .method-steps, .promise-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .trust-inner { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}