/* ============================================================
   OAKOrc · Services B-route · 服務內頁 mono spec sheet 風格
   Preview only — sync to production after approval
   ============================================================ */

/* Fonts loaded via <link rel="stylesheet"> in HTML <head> for parallel fetch (LCP opt 2026-05-01) */

:root {
  --oak-black: #0A0A0A;
  --oak-tungsten: #3A3A3C;
  --oak-fire: #E85D2F;
  --oak-fire-hover: #D14D20;
  --oak-fog: #F2F2F0;
  --oak-neutral: #8E8E93;
  --rail: #1F1F21;
  --rail-strong: #2E2E30;
  --container: 1280px;
  --gutter-page: clamp(24px, 4vw, 64px);
  --ease-out: cubic-bezier(.2, .7, .2, 1);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--oak-black); color: var(--oak-fog); -webkit-font-smoothing: antialiased; }
body { font-family: "Inter", "Noto Sans TC", system-ui, sans-serif; line-height: 1.6; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter-page); }
a { color: inherit; text-decoration: none; }

.skip-link {
  position: absolute; top: -48px; left: 16px; z-index: 200;
  padding: 10px 18px; border-radius: 4px;
  background: var(--oak-fire); color: #fff;
  font-family: "Space Grotesk", sans-serif; font-size: 13px; font-weight: 600;
  letter-spacing: .04em;
  transition: top .2s var(--ease-out);
}
.skip-link:focus { top: 12px; outline: 2px solid var(--oak-fog); outline-offset: 2px; }

/* ───── TOPBAR ───── */
.topbar {
  position: sticky; top: 0; z-index: 40;
  background: rgba(10,10,10,0.86);
  backdrop-filter: blur(16px) saturate(1.1);
  border-bottom: 1px solid var(--rail);
}
.topbar-row {
  display: grid; grid-template-columns: auto 1fr auto;
  align-items: center; gap: 24px; padding: 16px 0;
}
.topbar-brand {
  display: inline-flex; align-items: baseline; gap: 10px;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700; font-size: 16px; letter-spacing: 0.08em;
  color: var(--oak-fog);
}
.topbar-brand .fire { color: var(--oak-fire); }
.topbar-brand .zh {
  color: var(--oak-neutral); font-weight: 500; font-size: 12px;
  letter-spacing: 0.05em; font-family: "Noto Sans TC", sans-serif;
}
.topbar nav {
  display: flex; justify-content: center; gap: 28px;
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--oak-neutral);
}
.topbar nav a { padding: 4px 0; border-bottom: 1px solid transparent; transition: color .22s var(--ease-out), border-color .22s var(--ease-out); }
.topbar nav a:hover { color: var(--oak-fog); border-bottom-color: var(--oak-fire); }
.topbar nav a.active { color: var(--oak-fire); border-bottom-color: var(--oak-fire); }
.topbar-meta {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 11px; letter-spacing: 0.14em; color: var(--oak-neutral);
  display: flex; gap: 14px; align-items: center;
}
.topbar-meta .pulse { width: 7px; height: 7px; background: var(--oak-fire); border-radius: 50%; animation: pulse 1.6s ease-in-out infinite; }
.topbar-meta .lang b { color: var(--oak-fog); font-weight: 500; }
.topbar-meta .lang a { color: var(--oak-neutral); transition: color .22s var(--ease-out); }
.topbar-meta .lang a:hover { color: var(--oak-fire); }
.topbar-meta .start { color: var(--oak-fog); border-bottom: 1px solid var(--oak-fog); padding-bottom: 2px; transition: color .22s var(--ease-out), border-color .22s var(--ease-out); }
.topbar-meta .start:hover { color: var(--oak-fire); border-bottom-color: var(--oak-fire); }
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.4; transform: scale(0.7); } }

/* ───── BREADCRUMB ───── */
.breadcrumb {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--oak-neutral);
  padding: 32px 0 24px; border-bottom: 1px solid var(--rail);
}
.breadcrumb a { color: var(--oak-neutral); transition: color .22s var(--ease-out); }
.breadcrumb a:hover { color: var(--oak-fire); }
.breadcrumb .sep { margin: 0 12px; color: var(--oak-tungsten); }
.breadcrumb span:last-child { color: var(--oak-fog); font-weight: 500; }

/* ───── SERVICE HERO ───── */
.svc-page-hero {
  padding: 56px 0 64px;
  border-bottom: 1px solid var(--rail);
}
.svc-hero-meta {
  display: grid; grid-template-columns: auto 1fr auto;
  align-items: center; gap: 32px;
  padding-bottom: 24px; margin-bottom: 48px;
  border-bottom: 1px solid var(--rail);
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 11px; letter-spacing: 0.14em;
  color: var(--oak-neutral); text-transform: uppercase;
}
.svc-hero-meta .center { display: flex; gap: 24px; justify-content: center; flex-wrap: wrap; }
.svc-hero-meta .center .item b { color: var(--oak-fog); font-weight: 500; }
.svc-hero-meta .right { display: flex; gap: 10px; align-items: center; }
.svc-hero-meta .right .pulse { width: 8px; height: 8px; background: var(--oak-fire); border-radius: 50%; animation: pulse 1.6s ease-in-out infinite; }

.svc-hero-stage {
  display: grid; grid-template-columns: 1.2fr 1fr;
  gap: clamp(40px, 6vw, 80px);
  align-items: end;
}
.svc-hero-l { border-left: 1.5px solid var(--oak-fire); padding-left: clamp(20px, 2.4vw, 32px); }
.svc-hero-num {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--oak-fire); margin-bottom: 16px; display: block;
}
.svc-hero-h1 {
  font-family: "Noto Sans TC", sans-serif;
  font-weight: 700; font-size: clamp(40px, 5.4vw, 64px);
  line-height: 1.1; letter-spacing: -0.005em;
  color: var(--oak-fog); margin: 0 0 12px;
}
.svc-hero-h1 .en { display: block; font-family: "Space Grotesk", sans-serif; font-weight: 500; font-size: clamp(16px, 1.6vw, 22px); letter-spacing: 0.02em; color: var(--oak-neutral); margin-top: 8px; }
.svc-hero-lede {
  font-family: "Noto Sans TC", sans-serif;
  font-size: clamp(15px, 1.3vw, 17px); line-height: 1.65;
  color: #C7C7CB; max-width: 580px; margin: 24px 0;
}
.svc-hero-lede em { color: var(--oak-fire); font-style: normal; }
.svc-hero-actions { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; margin-top: 24px; }
.svc-hero-actions .meta { font-family: "JetBrains Mono", ui-monospace, monospace; font-size: 11px; color: var(--oak-neutral); letter-spacing: 0.08em; margin-left: 4px; }

.svc-hero-spec {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 12px; letter-spacing: 0.08em;
  color: var(--oak-neutral); line-height: 1.9;
}
.svc-hero-spec .row {
  display: grid; grid-template-columns: 110px 1fr;
  gap: 16px; padding: 8px 0;
  border-bottom: 1px solid var(--rail);
}
.svc-hero-spec .row:last-child { border-bottom: none; }
.svc-hero-spec .row .k { color: var(--oak-tungsten); text-transform: uppercase; letter-spacing: 0.16em; font-size: 10.5px; }
.svc-hero-spec .row .v { color: var(--oak-fog); font-weight: 500; }
.svc-hero-spec .row .v.accent { color: var(--oak-fire); }

/* ───── BUTTONS ───── */
.btn {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  padding: 13px 22px; border-radius: 0;
  border: 1px solid transparent; cursor: pointer;
  transition: background .22s var(--ease-out), color .22s var(--ease-out), border-color .22s var(--ease-out);
  display: inline-flex; align-items: center; gap: 12px;
  text-decoration: none; white-space: nowrap;
}
.btn .arr { transition: transform .22s var(--ease-out); }
.btn:hover .arr { transform: translateX(4px); }
.btn-primary { background: var(--oak-fire); color: #fff; border-color: var(--oak-fire); }
.btn-primary:hover { background: var(--oak-fire-hover); border-color: var(--oak-fire-hover); }
.btn-ghost-light { background: transparent; color: var(--oak-fog); border-color: var(--oak-fog); }
.btn-ghost-light:hover { background: var(--oak-fog); color: var(--oak-black); }

/* ───── SECTION ───── */
.svc-section {
  border-bottom: 1px solid var(--rail);
}
.svc-section[open] > summary {
  border-bottom: 1px solid var(--rail-strong);
}
.svc-section > summary {
  list-style: none; padding: 32px 0;
  cursor: pointer; user-select: none;
  position: relative;
  transition: background .22s var(--ease-out);
}
.svc-section > summary::-webkit-details-marker { display: none; }
.svc-section > summary:hover { background: rgba(232, 93, 47, 0.03); }
.svc-section > summary::after {
  content: "+"; position: absolute; right: var(--gutter-page); top: 32px;
  font-family: "JetBrains Mono", monospace; font-size: 24px;
  color: var(--oak-fire); transition: transform .22s var(--ease-out);
}
.svc-section[open] > summary::after { content: "−"; }
.svc-section > summary .label {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--oak-fire); margin-bottom: 12px; display: block;
}
.svc-section > summary h1,
.svc-section > summary h2 {
  font-family: "Noto Sans TC", sans-serif;
  font-weight: 700; font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1.2; color: var(--oak-fog);
  letter-spacing: -0.005em; margin: 0;
  max-width: 800px;
}
.svc-section > summary h1 .fire,
.svc-section > summary h2 .fire { color: var(--oak-fire); }
.svc-body { padding: 8px 0 56px; }
.svc-body p {
  font-family: "Noto Sans TC", sans-serif;
  font-size: 15px; line-height: 1.85;
  color: #C7C7CB; max-width: 760px; margin: 0 0 18px;
}
.svc-body p strong { color: var(--oak-fog); font-weight: 500; }
.svc-body p em { color: var(--oak-fire); font-style: normal; }

/* ───── LISTS ───── */
.svc-list {
  list-style: none; padding: 0; margin: 24px 0;
  border-top: 1px solid var(--rail);
}
.svc-list li {
  padding: 16px 0 16px 28px; position: relative;
  border-bottom: 1px solid var(--rail);
  font-family: "Noto Sans TC", sans-serif;
  font-size: 14.5px; line-height: 1.7;
  color: #C7C7CB;
}
.svc-list li::before {
  content: ""; position: absolute; left: 0; top: 26px;
  width: 8px; height: 1.5px; background: var(--oak-fire);
}
.svc-list li strong {
  color: var(--oak-fog); font-weight: 500;
  font-family: "Noto Sans TC", sans-serif;
}
.svc-list li a { color: var(--oak-fire); border-bottom: 1px solid var(--oak-fire); }
.svc-list li a:hover { color: var(--oak-fog); border-bottom-color: var(--oak-fog); }
.svc-list.exclude li::before { background: var(--oak-tungsten); }
.svc-list.exclude li { color: var(--oak-neutral); }

/* ───── COMPARE ───── */
.svc-compare {
  display: grid; grid-template-columns: 1fr 1fr; gap: 20px;
  margin: 36px 0;
}
.svc-compare > div {
  padding: 24px; border: 1px solid var(--rail);
  background: rgba(255,255,255,0.015);
}
.svc-compare .now { border-color: var(--oak-fire); background: rgba(232, 93, 47, 0.04); }
.svc-compare .tag {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 10.5px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--oak-tungsten); margin-bottom: 12px;
}
.svc-compare .now .tag { color: var(--oak-fire); }
.svc-compare p {
  font-family: "Noto Sans TC", sans-serif;
  font-size: 14px; line-height: 1.7; color: #C7C7CB; margin: 0;
}
.svc-compare p strong { color: var(--oak-fog); font-weight: 500; }

/* ───── FAQ ───── */
.svc-faq { border-top: 1px solid var(--rail); }
.svc-faq details {
  border-bottom: 1px solid var(--rail);
  padding: 18px 32px 18px 0; position: relative;
}
.svc-faq details > summary {
  list-style: none; cursor: pointer;
  font-family: "Noto Sans TC", sans-serif;
  font-weight: 500; font-size: 16px; line-height: 1.5;
  color: var(--oak-fog);
}
.svc-faq details > summary::-webkit-details-marker { display: none; }
.svc-faq details > summary::after {
  content: "+"; position: absolute; right: 0; top: 18px;
  font-family: "JetBrains Mono", monospace; font-size: 16px;
  color: var(--oak-fire); transition: transform .22s var(--ease-out);
}
.svc-faq details[open] > summary::after { content: "−"; }
.svc-faq details p {
  font-family: "Noto Sans TC", sans-serif;
  font-size: 14px; line-height: 1.75;
  color: #C7C7CB; margin: 12px 0 0; max-width: 760px;
}
.svc-faq details p strong { color: var(--oak-fog); font-weight: 500; }
.svc-faq details p em { color: var(--oak-fire); font-style: normal; }

/* ───── PRICING TIERS ───── */
.svc-tiers {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 0;
  border-top: 1px solid var(--rail-strong);
  border-bottom: 1px solid var(--rail-strong);
  margin: 24px 0;
}
.svc-tier {
  padding: 32px 28px;
  border-right: 1px solid var(--rail);
  display: flex; flex-direction: column;
}
.svc-tier:last-child { border-right: none; }
.svc-tier.featured { background: rgba(232, 93, 47, 0.04); }
.svc-tier .tier-tag {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 10.5px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--oak-neutral); margin-bottom: 16px;
}
.svc-tier.featured .tier-tag { color: var(--oak-fire); }
.svc-tier .tier-name {
  font-family: "Noto Sans TC", sans-serif;
  font-weight: 700; font-size: 18px;
  color: var(--oak-fog); margin-bottom: 8px; letter-spacing: 0.005em;
}
.svc-tier .tier-price {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 22px; font-weight: 500;
  color: var(--oak-fog); margin-bottom: 24px;
  letter-spacing: -0.01em;
}
.svc-tier .tier-price .unit { font-size: 12px; color: var(--oak-neutral); margin-left: 4px; letter-spacing: 0.08em; }
.svc-tier ul { list-style: none; padding: 0; margin: 0 0 20px; flex: 1; }
.svc-tier ul li {
  font-family: "Noto Sans TC", sans-serif;
  font-size: 13.5px; line-height: 1.65;
  color: #C7C7CB; padding: 6px 0 6px 16px; position: relative;
}
.svc-tier ul li::before {
  content: "·"; position: absolute; left: 0; top: 6px;
  color: var(--oak-fire); font-weight: 700;
}
.svc-tier .tier-fit {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 11px; letter-spacing: 0.08em;
  color: var(--oak-neutral);
  padding-top: 16px; border-top: 1px solid var(--rail);
}

/* ───── BOTTOM CTA ───── */
.svc-bottom-cta {
  padding: 96px 0; background: #050505;
  border-top: 1px solid var(--rail-strong);
}
.svc-bottom-cta h2 {
  font-family: "Noto Sans TC", sans-serif;
  font-weight: 700; font-size: clamp(32px, 4vw, 56px);
  line-height: 1.15; color: var(--oak-fog);
  letter-spacing: -0.005em; margin: 0 0 20px;
}
.svc-bottom-cta h2 .fire { color: var(--oak-fire); }
.svc-bottom-cta .sub {
  font-family: "Noto Sans TC", sans-serif;
  font-size: 16px; line-height: 1.7;
  color: #C7C7CB; max-width: 720px; margin: 0 0 36px;
}
.svc-bottom-cta .actions { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; margin-bottom: 32px; }
.svc-bottom-cta .actions .email { font-family: "JetBrains Mono", ui-monospace, monospace; font-size: 12px; color: var(--oak-neutral); letter-spacing: 0.08em; margin-left: 8px; }
.svc-bottom-cta .actions .email a { color: var(--oak-fog); border-bottom: 1px solid var(--oak-fire); padding-bottom: 1px; }
.svc-bottom-cta .actions .email a:hover { color: var(--oak-fire); }
.svc-bottom-cta .back-link {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--oak-neutral); transition: color .22s var(--ease-out);
}
.svc-bottom-cta .back-link:hover { color: var(--oak-fire); }

/* ───── AUDIT FORM (web-redesign only) ───── */
.audit-form { display: grid; gap: 14px; margin: 32px 0 0; max-width: 540px; }
.audit-form .field { display: flex; flex-direction: column; gap: 6px; }
.audit-form label {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 10.5px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--oak-neutral);
}
.audit-form input,
.audit-form select {
  background: rgba(255,255,255,0.03); border: 1px solid var(--rail-strong);
  color: var(--oak-fog); padding: 12px 14px; border-radius: 0;
  font-family: inherit; font-size: 15px; width: 100%;
  transition: border-color .2s ease;
}
.audit-form input:focus,
.audit-form select:focus { outline: none; border-color: var(--oak-fire); }
.audit-form input::placeholder { color: var(--oak-tungsten); }
.audit-form .submit-row { display: flex; align-items: center; gap: 16px; margin-top: 8px; flex-wrap: wrap; }
.audit-form .price-note { font-family: "Noto Sans TC", sans-serif; font-size: 13px; color: var(--oak-neutral); }
.audit-form .price-note strong { color: var(--oak-fire); }
.audit-form button.btn-primary { border-radius: 0; }

/* ───── FUNNEL DIAGRAM (web-redesign only) ───── */
.funnel-flow { margin: 32px 0; }
.funnel-flow .lane-grid {
  display: grid; grid-template-columns: 100px 1fr;
  gap: 16px; margin-bottom: 24px;
}
.funnel-flow .lane-label {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 10.5px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--oak-neutral); padding-top: 36px;
}
.funnel-flow .lane-label.client { color: var(--oak-fire); }
.funnel-flow .bracket-row,
.funnel-flow .lane-track {
  display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px;
}
.funnel-flow .bracket {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 9.5px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--oak-tungsten); text-align: center; padding: 4px 0;
}
.funnel-flow .bracket.fire { color: var(--oak-fire); }
.funnel-flow .bracket.empty { color: transparent; }
.funnel-flow .step {
  padding: 12px 10px; border: 1px solid var(--rail);
  background: rgba(255,255,255,0.02); min-height: 86px;
  font-family: "Noto Sans TC", sans-serif;
  font-size: 11.5px; color: #C7C7CB; line-height: 1.4;
}
.funnel-flow .step.empty { border: none; background: transparent; }
.funnel-flow .step.client-active { border-color: var(--oak-fire); background: rgba(232, 93, 47, 0.06); }
.funnel-flow .step.us-active { border-color: var(--oak-neutral); }
.funnel-flow .step .ttl { font-weight: 500; color: var(--oak-fog); margin-bottom: 4px; }
.funnel-flow .step .ttl strong { color: var(--oak-fog); font-weight: 500; }
.funnel-flow .step .price-chip {
  display: inline-block; margin-top: 6px;
  font-family: "JetBrains Mono", monospace;
  font-size: 9.5px; letter-spacing: 0.14em; text-transform: uppercase;
  padding: 2px 8px; border: 1px solid var(--oak-fire); color: var(--oak-fire);
}
.funnel-flow .legend {
  display: flex; gap: 24px; margin-top: 16px;
  font-family: "JetBrains Mono", monospace;
  font-size: 10.5px; letter-spacing: 0.14em; color: var(--oak-neutral);
  text-transform: uppercase;
}
.funnel-flow .legend-dot { display: inline-block; width: 10px; height: 10px; margin-right: 6px; vertical-align: middle; }
.funnel-flow .legend-dot.client { background: var(--oak-fire); }
.funnel-flow .legend-dot.us { background: var(--oak-neutral); }

/* ───── PLACEHOLDER ───── */
.svc-cases-placeholder {
  padding: 36px; border: 1.5px dashed var(--rail-strong);
  text-align: center; margin: 24px 0;
}
.svc-cases-placeholder .pre {
  font-family: "JetBrains Mono", monospace;
  font-size: 10.5px; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--oak-fire); margin-bottom: 12px;
}
.svc-cases-placeholder h3 {
  font-family: "Noto Sans TC", sans-serif;
  font-weight: 700; font-size: 22px;
  color: var(--oak-fog); margin: 0 0 12px;
}
.svc-cases-placeholder p {
  font-family: "Noto Sans TC", sans-serif;
  font-size: 14px; line-height: 1.7; color: #C7C7CB;
  max-width: 560px; margin: 0 auto 24px;
}
.svc-cases-placeholder .actions { justify-content: center; }

/* ───── FOOTER ───── */
footer { padding: 56px 0 32px; background: var(--oak-black); border-top: 1px solid var(--rail); }
.foot-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px; padding-bottom: 36px;
  border-bottom: 1px solid var(--rail);
}
.foot-brand .mark { display: block; height: 58px; width: auto; margin-bottom: 18px; }
.foot-brand .lede { font-family: "Noto Sans TC", sans-serif; font-size: 13px; line-height: 1.7; color: #C7C7CB; margin: 0 0 18px; max-width: 380px; }
.foot-brand .est { font-family: "JetBrains Mono", monospace; font-size: 10.5px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--oak-neutral); }
.foot-col h4 {
  font-family: "JetBrains Mono", monospace;
  font-size: 10.5px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--oak-tungsten);
  margin: 0 0 16px; padding-bottom: 10px;
  border-bottom: 1px solid var(--rail);
}
.foot-col ul { list-style: none; padding: 0; margin: 0; }
.foot-col li { font-family: "Noto Sans TC", sans-serif; font-size: 13px; color: #C7C7CB; padding: 6px 0; }
.foot-col li a { transition: color .22s var(--ease-out); }
.foot-col li a:hover { color: var(--oak-fire); }
.foot-bottom {
  padding-top: 24px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px;
  font-family: "JetBrains Mono", monospace;
  font-size: 10.5px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--oak-neutral);
}
.foot-bottom .tag { color: var(--oak-fog); letter-spacing: 0.18em; }

/* ───── SCROLL TOP ───── */
.scroll-top {
  position: fixed; right: 24px; bottom: 40px;
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  background: transparent; color: var(--oak-fire);
  border: none; outline: 1.5px solid var(--oak-fire); outline-offset: -1px;
  border-radius: 999px; cursor: pointer; padding: 0; z-index: 100;
  opacity: 0; pointer-events: none; transform: translateY(8px);
  transition: opacity .28s var(--ease-out), transform .28s var(--ease-out), background .22s var(--ease-out), color .22s var(--ease-out);
}
.scroll-top.visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
.scroll-top:hover { background: var(--oak-fire); color: var(--oak-fog); }

/* ───── RESPONSIVE ───── */
@media (max-width: 1024px) {
  .topbar-brand .zh { display: none; }
  .topbar-meta .start { display: none; }
  .svc-hero-stage { grid-template-columns: 1fr; gap: 48px; }
  .svc-hero-meta { grid-template-columns: 1fr; gap: 12px; }
  .svc-hero-meta .center { justify-content: flex-start; }
  .svc-tiers { grid-template-columns: 1fr; }
  .svc-tier { border-right: none; border-bottom: 1px solid var(--rail); }
  .svc-tier:last-child { border-bottom: none; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .funnel-flow .lane-grid { grid-template-columns: 1fr; }
  .funnel-flow .lane-label { padding-top: 0; }
  .funnel-flow .bracket-row, .funnel-flow .lane-track { grid-template-columns: repeat(3, 1fr); }
  .funnel-flow .bracket.empty, .funnel-flow .step.empty { display: none; }
}
@media (max-width: 720px) {
  .topbar-row { grid-template-columns: auto 1fr; grid-template-rows: auto auto; gap: 10px 16px; padding: 12px 0; }
  .topbar nav { grid-column: 1 / -1; gap: 18px; font-size: 10.5px; overflow-x: auto; flex-wrap: nowrap; padding-bottom: 4px; }
  .topbar nav a { white-space: nowrap; flex: 0 0 auto; }
  .topbar-meta { justify-self: end; gap: 10px; }
  .svc-compare { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr; gap: 28px; }
  .svc-section > summary { padding-right: 32px; }
  .svc-section > summary::after { right: 12px; top: 32px; }
}
