/* =========================================================
   大湾区创业服务中心 — 浅色机构风
   设计语言：极致专业 · 极致高级感
   调色板：米白纸感 × 香槟金 × 深墨衬线
   自适应：桌面 / 平板 / 手机三断点
   ========================================================= */

:root {
  /* —— 浅蓝机构配色 —— */
  --paper:        #f3f7fb;   /* 主背景：冰蓝纸感 */
  --paper-soft:   #e8f1f9;   /* 次背景：略深冰蓝 */
  --paper-card:   #ffffff;   /* 卡片白 */
  --ink:          #0f2747;   /* 主文字：深海军蓝 */
  --ink-soft:     #3a557a;   /* 次文字：海军蓝 */
  --muted:        #7a8ba1;   /* 辅助文字：灰蓝 */
  --accent:       #2c5aa0;   /* 主强调：海军蓝 */
  --accent-deep:  #1a3a6f;   /* 深海军蓝（hover） */
  --accent-soft:  rgba(44, 90, 160, 0.10);
  --accent-line:  rgba(44, 90, 160, 0.25);
  --line:         rgba(15, 39, 71, 0.10);
  --line-strong:  rgba(15, 39, 71, 0.18);
  --shadow-sm:   0 1px 2px rgba(15, 39, 71, 0.05);
  --shadow-md:   0 8px 24px rgba(15, 39, 71, 0.08);
  --shadow-lg:   0 24px 60px rgba(15, 39, 71, 0.14);

  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", serif;
  --sans:  -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
           "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;

  --maxw: 1280px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "ss01";
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; transition: color .25s var(--ease); }

/* ============================================================
   顶部通知条
   ============================================================ */
.topbar {
  background: var(--ink);
  color: var(--paper);
  font-size: 12px;
  letter-spacing: 0.5px;
}
.topbar-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 10px 24px;
  display: flex; justify-content: space-between; align-items: center;
  gap: 16px; flex-wrap: wrap;
}
.topbar-tag { color: var(--accent); }
.topbar-meta { color: rgba(243, 247, 251, 0.7); }

/* ============================================================
   导航
   ============================================================ */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(243, 247, 251, 0.92);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px 24px;
  display: flex; align-items: center; gap: 32px;
}
.brand { display: flex; align-items: center; gap: 14px; flex: 1; min-width: 0; }
.brand-mark { width: 60px; height: 60px; object-fit: contain; }
.brand-text { display: flex; flex-direction: column; min-width: 0; }
.brand-name {
  font-family: var(--serif);
  font-weight: 600; font-size: 16px; color: var(--ink);
  letter-spacing: 0.5px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.brand-sub {
  font-size: 11px; color: var(--muted);
  letter-spacing: 0.3px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  max-width: 56vw;
}

.nav-links {
  display: flex; align-items: center; gap: 28px; font-size: 14px;
}
.nav-links a {
  position: relative;
  padding: 4px 0;
  color: var(--ink-soft);
  font-weight: 500;
  transition: color .25s var(--ease);
}
.nav-links a:hover { color: var(--ink); }
.nav-links a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -2px;
  height: 1.5px; background: var(--accent);
  transition: right .35s var(--ease);
}
.nav-links a:hover::after { right: 0; }
.nav-links a.is-active { color: var(--accent-deep); }
.nav-links a.is-active::after { right: 0; }
.nav-cta {
  background: var(--ink);
  color: var(--paper) !important;
  padding: 10px 18px !important;
  border-radius: 4px;
  font-weight: 600;
}
.nav-cta:hover { background: var(--accent-deep); }
.nav-cta::after { display: none !important; }

.nav-toggle {
  display: none;
  width: 42px; height: 42px; padding: 0;
  background: transparent; border: 1px solid var(--line-strong); border-radius: 4px;
  cursor: pointer;
}
.nav-toggle span {
  display: block; width: 20px; height: 1.5px; margin: 4px auto;
  background: var(--ink); border-radius: 1px;
  transition: transform .3s var(--ease), opacity .25s var(--ease);
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

.nav-menu {
  display: none;
  flex-direction: column;
  background: var(--paper-card);
  border-top: 1px solid var(--line);
  padding: 8px 24px 20px;
}
.nav-menu.is-open { display: flex; }
.nav-menu a {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 15px; font-weight: 500;
}
.nav-menu a:last-child { border-bottom: 0; }
.nav-menu a:hover { color: var(--ink); }
.nav-cta-mobile {
  margin-top: 12px; background: var(--ink); color: var(--paper) !important;
  padding: 14px !important; text-align: center; border-radius: 4px;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  padding: clamp(60px, 10vw, 110px) 24px clamp(60px, 10vw, 100px);
  background:
    radial-gradient(ellipse at top right, var(--accent-soft), transparent 60%),
    var(--paper);
  border-bottom: 1px solid var(--line);
}
.hero-grid {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid; gap: clamp(40px, 5vw, 80px);
  grid-template-columns: 1.4fr 1fr;
  align-items: center;
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 14px;
  margin: 0 0 28px;
  font-family: var(--serif);
  font-size: 13px; letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--accent-deep);
}
.hero-eyebrow .rule {
  display: inline-block; width: 36px; height: 1px;
  background: var(--accent);
}
.hero-title {
  margin: 0 0 28px;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.18;
  letter-spacing: -0.5px;
  color: var(--ink);
}
.hero-title .emph {
  font-style: italic;
  color: var(--accent-deep);
  font-weight: 600;
}
.hero-sub {
  margin: 0 0 36px;
  font-size: clamp(15px, 1.3vw, 17px);
  color: var(--ink-soft);
  max-width: 620px;
  line-height: 1.75;
}
.hero-sub strong {
  color: var(--ink);
  font-family: var(--serif);
  font-weight: 600;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 26px;
  font-family: var(--sans);
  font-size: 14px; font-weight: 600;
  letter-spacing: 0.5px;
  border-radius: 4px;
  cursor: pointer;
  transition: all .3s var(--ease);
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--ink);
  color: var(--paper);
  box-shadow: 0 8px 20px rgba(15, 39, 71, 0.18);
}
.btn-primary:hover { background: var(--accent-deep); transform: translateY(-2px); box-shadow: 0 14px 28px rgba(26, 58, 111, 0.3); }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-strong);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-deep); }
.btn-lg { padding: 18px 36px; font-size: 15px; }
.cta .btn-lg { width: 100%; max-width: 360px; justify-content: center; }

/* hero card */
.hero-card {
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 36px;
  box-shadow: var(--shadow-md);
  position: relative;
}
.hero-card::before {
  content: ""; position: absolute; inset: 12px;
  border: 1px solid var(--accent-line);
  pointer-events: none;
  border-radius: 3px;
}
.hero-card-head {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 28px; padding-bottom: 16px;
  border-bottom: 1px solid var(--accent-line);
}
.hero-card-no {
  font-family: var(--serif);
  font-size: 28px; font-weight: 600;
  color: var(--accent-deep);
  letter-spacing: 1px;
}
.hero-card-label {
  font-size: 10px; letter-spacing: 3px;
  color: var(--muted);
  text-transform: uppercase;
}
.hero-card-list {
  list-style: none; padding: 0; margin: 0 0 28px;
}
.hero-card-list li {
  display: flex; align-items: center; gap: 14px;
  padding: 12px 0;
  font-size: 14px; color: var(--ink-soft);
  border-bottom: 1px dashed var(--line);
}
.hero-card-list li:last-child { border-bottom: 0; }
.hero-card-list .dot {
  flex-shrink: 0; width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 50%;
}
.hero-card-foot {
  display: grid; grid-template-columns: repeat(3, 1fr);
  padding-top: 20px;
  border-top: 1px solid var(--accent-line);
  gap: 12px;
  text-align: center;
}
.hero-card-foot > div { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px; text-align: center; width: 100%; }
.hero-card-foot > div > * { align-self: center; }
.metric {
  font-family: var(--serif);
  font-size: 28px; font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.5px;
  text-align: center;
  align-self: center;
  width: 100%;
}
.metric-lbl { font-size: 11px; color: var(--muted); letter-spacing: 1px; text-align: center; width: 100%; }

/* ============================================================
   信任条
   ============================================================ */
.trustbar { background: var(--paper-soft); border-bottom: 1px solid var(--line); }
.trustbar-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 28px 24px;
  display: grid; gap: 24px;
  grid-template-columns: repeat(4, 1fr);
}
.trust-item { display: flex; align-items: baseline; gap: 12px; }
.t-num {
  font-family: var(--serif);
  font-size: 18px; color: var(--accent-deep);
  font-weight: 600; flex-shrink: 0;
}
.t-text { font-size: 14px; color: var(--ink-soft); line-height: 1.6; }
.t-text strong { color: var(--ink); font-weight: 600; }

/* ============================================================
   章节通用
   ============================================================ */
.section { padding: clamp(70px, 9vw, 120px) 24px; }
.section-alt { background: var(--paper-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head {
  max-width: var(--maxw);
  margin: 0 auto clamp(40px, 5vw, 64px);
  text-align: center;
}
.eyebrow {
  display: inline-block;
  font-family: var(--serif);
  font-size: 12px; letter-spacing: 4px;
  color: var(--accent-deep);
  text-transform: uppercase;
  margin-bottom: 16px;
}
.eyebrow-light { color: var(--accent); }
/* CTA 深底上的 eyebrow：必须用浅色，不能继承 .eyebrow 的金色 */
.cta .eyebrow,
.cta .eyebrow-light { color: var(--paper) !important; opacity: 0.85; }
.section-title {
  margin: 0 0 20px;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.2;
  letter-spacing: -0.5px;
  color: var(--ink);
}
.section-lede {
  margin: 0 auto;
  font-size: clamp(15px, 1.3vw, 17px);
  color: var(--ink-soft);
  max-width: 760px;
  line-height: 1.75;
}
.section-lede strong { color: var(--ink); font-weight: 600; }

.keywords {
  max-width: var(--maxw);
  margin: 48px auto 0;
  padding-top: 32px;
  border-top: 1px solid var(--line);
  text-align: center;
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 1px;
  line-height: 1.9;
}

/* ============================================================
   2. AI BOT 应用场景
   ============================================================ */
.bots-grid {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid; gap: 18px;
  grid-template-columns: repeat(3, 1fr);
}
.bot {
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  padding: 28px 24px;
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), border-left-color .35s var(--ease);
}
.bot:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-left-color: var(--accent-deep);
}
.bot-icon {
  display: inline-block;
  font-size: 32px;
  line-height: 1;
  margin-bottom: 14px;
  filter: grayscale(0.1);
}
.bot h3 {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-size: 18px; font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.3px;
}
.bot p {
  margin: 0 0 14px;
  font-size: 13.5px;
  color: var(--ink-soft);
  line-height: 1.7;
}
.bot-tag {
  display: inline-block;
  font-size: 11px; font-weight: 600;
  letter-spacing: 1px;
  padding: 4px 10px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  border-radius: 999px;
}
.bot-foot {
  max-width: var(--maxw);
  margin: 36px auto 0;
  text-align: center;
  font-size: 14px;
  color: var(--ink-soft);
  padding: 24px;
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.bot-foot strong { color: var(--ink); }

/* ============================================================
   3. 五大核心服务
   ============================================================ */
.services-grid {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid; gap: 1px;
  background: var(--line);
  grid-template-columns: repeat(5, 1fr);
  border: 1px solid var(--line);
}
.svc {
  background: var(--paper);
  padding: 36px 28px;
  display: flex; flex-direction: column; gap: 14px;
  transition: background .3s var(--ease);
  min-height: 260px;
}
.svc:hover { background: var(--paper-card); }
.svc-no {
  font-family: var(--serif);
  font-size: 14px; color: var(--accent-deep);
  letter-spacing: 2px; font-weight: 600;
}
.svc h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 19px; font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.3px;
}
.svc p { margin: 0; font-size: 14px; color: var(--ink-soft); line-height: 1.7; flex: 1; }
.svc-link {
  font-size: 13px; font-weight: 600;
  color: var(--accent-deep);
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 2px;
  align-self: flex-start;
}
.svc-link:hover { color: var(--ink); border-color: var(--ink); }

/* ============================================================
   2. 云服务器
   ============================================================ */
.cloud-grid {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid; gap: 24px;
  grid-template-columns: repeat(4, 1fr);
}
.cloud {
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  padding: 32px 28px;
  border-radius: 4px;
  transition: transform .35s var(--ease), box-shadow .35s var(--ease);
}
.cloud:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.cloud-head {
  display: flex; align-items: center; gap: 14px; margin-bottom: 8px;
}
.cloud-mark {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  background: var(--ink); color: var(--paper);
  font-family: var(--serif); font-size: 22px; font-weight: 600;
  border-radius: 4px;
  flex-shrink: 0;
}
.cloud h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 19px; font-weight: 600;
  color: var(--ink);
}
.badge {
  display: inline-block;
  font-size: 11px; font-weight: 600;
  letter-spacing: 1px;
  padding: 3px 10px;
  border: 1px solid var(--accent-line);
  border-radius: 999px;
  color: var(--accent-deep);
  background: var(--accent-soft);
}
.badge-best {
  background: var(--ink); color: var(--paper);
  border-color: var(--ink);
}
.cloud-sub {
  margin: 4px 0 20px;
  font-size: 12px; color: var(--muted);
  letter-spacing: 0.3px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.cloud-feats {
  list-style: none; padding: 0; margin: 0;
}
.cloud-feats li {
  position: relative; padding: 8px 0 8px 20px;
  font-size: 13px; color: var(--ink-soft); line-height: 1.6;
}
.cloud-feats li::before {
  content: "·"; position: absolute; left: 4px; top: 8px;
  color: var(--accent); font-weight: 700; font-size: 18px;
  line-height: 1;
}
.cloud-foot {
  max-width: var(--maxw);
  margin: 48px auto 0;
  font-size: 14px; color: var(--ink-soft);
  text-align: center;
  padding-top: 28px;
  border-top: 1px solid var(--accent-line);
}
.cloud-foot strong { color: var(--ink); }
.cloud-foot a { color: var(--accent-deep); border-bottom: 1px solid var(--accent); }

/* ============================================================
   3. 方案与费用
   ============================================================ */
.plan-band {
  max-width: var(--maxw);
  margin: 0 auto 20px;
  font-family: var(--serif);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 600;
  color: var(--ink);
  text-align: center;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent);
}
.plan-band-sub {
  max-width: var(--maxw);
  margin: 0 auto 36px;
  text-align: center;
  font-size: 14px;
  color: var(--muted);
}
.plans {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid; gap: 20px;
  grid-template-columns: repeat(3, 1fr);
  justify-content: center;
}
.plan {
  background: var(--paper-card);
  border: 1px solid var(--line);
  padding: 32px 28px;
  border-radius: 4px;
  display: flex; flex-direction: column;
  transition: transform .35s var(--ease), box-shadow .35s var(--ease);
  position: relative;
}
.plan:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.plan-hot {
  border-color: var(--accent);
  border-top: 4px solid var(--accent);
}
.plan-popular {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.plan-popular .plan-no,
.plan-popular .plan-price,
.plan-popular h4,
.plan-popular .plan-list li { color: var(--paper) !important; }
.plan-popular .plan-list li.muted { color: rgba(250, 247, 240, 0.4) !important; }
.plan-popular .plan-tag,
.plan-popular .plan-old { color: #cdd6e1 !important; opacity: 0.95; }
.plan-popular .plan-price .cur,
.plan-popular .plan-price .amt,
.plan-popular .plan-price .unit { color: var(--paper) !important; }
.plan-popular .plan-head { border-bottom-color: rgba(44, 90, 160, 0.4); }
.plan-popular .plan-badge-gold {
  background: var(--accent); color: var(--ink);
  border-color: var(--accent);
}
.plan-head {
  margin-bottom: 20px; padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}
.plan-no {
  font-family: var(--serif);
  font-size: 12px; letter-spacing: 2px;
  color: var(--accent-deep); font-weight: 600;
}
.plan h4 {
  margin: 8px 0 4px;
  font-family: var(--serif);
  font-size: 22px; font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.3px;
}
.plan-tag { margin: 0; font-size: 13px; color: var(--muted); }
.plan-price {
  display: flex; align-items: baseline; gap: 4px;
  margin: 16px 0 8px;
}
.plan-price .cur {
  font-family: var(--serif);
  font-size: 22px; color: var(--accent-deep); font-weight: 600;
}
.plan-price .amt {
  font-family: var(--serif);
  font-size: 44px; font-weight: 600;
  color: var(--ink); letter-spacing: -1px; line-height: 1;
}
.plan-popular .plan-price .amt { color: var(--accent); }
.plan-price .unit { font-size: 13px; color: var(--muted); }
.plan-old {
  margin: 0 0 12px;
  font-size: 12px; color: var(--muted);
  text-decoration: line-through;
}
.plan-badge {
  display: inline-block;
  font-size: 11px; font-weight: 600;
  padding: 4px 10px;
  background: var(--accent-soft); color: var(--accent-deep);
  border: 1px solid var(--accent-line);
  border-radius: 999px;
  margin-bottom: 20px;
}
.plan-list {
  list-style: none; padding: 0; margin: 0;
  flex: 1;
}
.plan-list li {
  padding: 9px 0 9px 22px;
  position: relative;
  font-size: 13.5px; color: var(--ink-soft); line-height: 1.6;
  border-bottom: 1px dashed var(--line);
}
.plan-list li:last-child { border-bottom: 0; }
.plan-list li::before {
  content: "✓"; position: absolute; left: 0; top: 9px;
  color: var(--accent); font-weight: 700; font-size: 13px;
}
.plan-list li.muted { color: var(--muted); }
.plan-list li.muted::before { content: "—"; color: var(--muted); }
.plan-upgrade {
  margin: 18px 0 0;
  padding: 14px;
  font-size: 13px; color: var(--ink-soft); line-height: 1.6;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 2px;
}
.plan-upgrade strong { color: var(--ink); }

/* tables (加购 / 服务范围 / 费用责任) */
.addons-table, .scope-table, .cost-table, .support-table {
  max-width: var(--maxw);
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
  background: var(--paper-card);
}
.add-row, .scope-row, .cost-row, .sup-row {
  display: grid;
  align-items: center;
  padding: 14px 24px;
  border-bottom: 1px solid var(--line);
  font-size: 14px; color: var(--ink-soft);
}
.add-row:last-child, .scope-row:last-child, .cost-row:last-child, .sup-row:last-child { border-bottom: 0; }
.add-row:hover, .scope-row:hover, .cost-row:hover, .sup-row:hover { background: var(--paper-soft); }
.add-head, .scope-head, .cost-head, .sup-head {
  background: var(--ink); color: var(--paper);
  font-size: 12px; letter-spacing: 2px;
  font-weight: 600; text-transform: uppercase;
}
.add-head:hover, .scope-head:hover, .cost-head:hover, .sup-head:hover { background: var(--ink); }
.add-row { grid-template-columns: 100px 1fr 120px; }
.scope-row { grid-template-columns: 160px 1fr 1fr; gap: 24px; }
.scope-head { grid-template-columns: 160px 1fr 1fr; }
.cost-row { grid-template-columns: 1.6fr 1fr 1.2fr 1fr; }
.cost-head { grid-template-columns: 1.6fr 1fr 1.2fr 1fr; }
.sup-row { grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 16px; }
.sup-head { grid-template-columns: 1.4fr 1fr 1fr 1fr; }
.sup-row .lbl { color: var(--ink); font-weight: 600; }
.tier-b { color: var(--accent-deep) !important; }
.tier-s { color: var(--ink) !important; }
.tier-f { color: var(--ink) !important; }
/* 在深底表头里强制用浅色 — 否则深底深字看不清 */
.sup-head .tier-b,
.sup-head .tier-s,
.sup-head .tier-f { color: var(--paper) !important; opacity: 0.85; }
.cost-foot, .support-foot, .api-foot {
  max-width: var(--maxw);
  margin: 24px auto 0;
  font-size: 13px; color: var(--muted);
  text-align: center;
  line-height: 1.8;
}
.cost-foot strong, .support-foot strong, .api-foot strong { color: var(--ink-soft); }

/* ============================================================
   4. AI 模型 API
   ============================================================ */
.api-grid {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid; gap: 20px;
  grid-template-columns: repeat(4, 1fr);
}
.api {
  background: var(--paper-card);
  border: 1px solid var(--line);
  padding: 28px 22px;
  border-radius: 4px;
  border-top: 2px solid var(--accent);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.api:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.api-no {
  font-family: var(--serif);
  font-size: 12px; letter-spacing: 2px;
  color: var(--accent-deep); font-weight: 600;
}
.api h3 {
  margin: 12px 0 12px;
  font-family: var(--serif);
  font-size: 17px; font-weight: 600;
  color: var(--ink);
  line-height: 1.3;
}
.api p { margin: 0; font-size: 13px; color: var(--ink-soft); line-height: 1.65; }

/* ============================================================
   5. 部署流程
   ============================================================ */
.steps {
  max-width: var(--maxw);
  margin: 0 auto;
  list-style: none; padding: 0;
  display: grid; gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  grid-template-columns: 1fr;
}
.step {
  background: var(--paper-card);
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 24px;
  padding: 28px 32px;
  align-items: center;
  transition: background .3s var(--ease);
}
.step:hover { background: var(--paper-soft); }
.step-no {
  font-family: var(--serif);
  font-size: 42px; font-weight: 600;
  color: var(--accent-deep);
  letter-spacing: -1px;
  line-height: 1;
}
.step-body h3 {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-size: 18px; font-weight: 600;
  color: var(--ink);
}
.step-body p { margin: 0 0 10px; font-size: 14px; color: var(--ink-soft); line-height: 1.7; }
.step-meta {
  display: inline-block;
  font-size: 12px; font-weight: 600;
  padding: 4px 12px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 999px;
  letter-spacing: 0.5px;
}

.deliverables { max-width: var(--maxw); margin: 64px auto 0; }
.deliverables h3 {
  margin: 0 0 24px;
  font-family: var(--serif);
  font-size: 22px; font-weight: 600;
  color: var(--ink);
  text-align: center;
}
.deliverables-grid {
  display: grid; gap: 20px;
  grid-template-columns: repeat(4, 1fr);
}
.del {
  padding: 28px 24px;
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-top: 2px solid var(--accent);
  border-radius: 4px;
}
.del-no {
  font-family: var(--serif);
  font-size: 26px; font-weight: 600;
  color: var(--accent-deep);
  letter-spacing: -0.5px;
}
.del h4 {
  margin: 12px 0 8px;
  font-family: var(--serif);
  font-size: 17px; font-weight: 600;
  color: var(--ink);
}
.del p { margin: 0; font-size: 13.5px; color: var(--ink-soft); line-height: 1.7; }

/* ============================================================
   6. 维护 3 档
   ============================================================ */
.support-notes {
  max-width: var(--maxw);
  margin: 48px auto 0;
  display: grid; gap: 20px;
  grid-template-columns: repeat(3, 1fr);
}
.note {
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  padding: 24px;
  border-radius: 0 4px 4px 0;
}
.note-icon {
  display: inline-block;
  font-size: 22px;
  margin-bottom: 8px;
}
.note h4 {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-size: 16px; font-weight: 600;
  color: var(--ink);
}
.note p { margin: 0; font-size: 13.5px; color: var(--ink-soft); line-height: 1.7; }

/* ============================================================
   7. FAQ
   ============================================================ */
.faq-list {
  max-width: 900px;
  margin: 0 auto;
  display: flex; flex-direction: column; gap: 12px;
}
.faq {
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
}
.faq[open] {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}
.faq summary {
  list-style: none;
  cursor: pointer;
  padding: 22px 28px;
  display: flex; align-items: center; gap: 16px;
  font-family: var(--serif);
  font-size: 17px; font-weight: 600;
  color: var(--ink);
  transition: background .2s var(--ease);
  user-select: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { background: var(--paper-soft); }
.faq-q {
  font-family: var(--serif);
  color: var(--accent-deep);
  font-size: 18px;
  flex-shrink: 0;
}
.faq-caret {
  margin-left: auto;
  width: 14px; height: 14px;
  border-right: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  transform: rotate(45deg);
  transition: transform .3s var(--ease);
  flex-shrink: 0;
}
.faq[open] .faq-caret { transform: rotate(-135deg); }
.faq-a {
  padding: 0 28px 24px;
  font-size: 14.5px; color: var(--ink-soft);
  line-height: 1.85;
}
.faq-a p { margin: 0 0 12px; }
.faq-a p:last-child { margin-bottom: 0; }
.faq-a strong { color: var(--ink); font-weight: 600; }

/* ============================================================
   8. CTA
   ============================================================ */
.cta {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(80px, 10vw, 120px) 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta::before {
  content: ""; position: absolute;
  inset: -200px -200px auto auto;
  width: 600px; height: 600px;
  background: radial-gradient(closest-side, rgba(44, 90, 160, 0.25), transparent 70%);
  pointer-events: none;
}
.cta-inner {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}
.cta h2 {
  margin: 0 0 20px;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.2;
  letter-spacing: -0.5px;
  color: var(--paper);
}
.cta p {
  margin: 0 0 36px;
  font-size: 17px;
  color: rgba(250, 247, 240, 0.8);
  line-height: 1.75;
}
.cta .btn-primary { background: var(--accent); color: #ffffff; }
.cta .btn-primary:hover { background: var(--paper); color: var(--ink); }
.cta .btn-ghost { color: var(--paper); border-color: rgba(250, 247, 240, 0.3); }
.cta .btn-ghost:hover { background: var(--paper); color: var(--ink); border-color: var(--paper); }
.cta-actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; margin-bottom: 28px; }
.cta-foot { font-size: 13px; color: var(--paper); margin: 0; opacity: 0.7; }

/* ============================================================
   Footer
   ============================================================ */
.footer {
  background: var(--paper-soft);
  border-top: 1px solid var(--line);
  padding: 56px 24px 36px;
}
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid; gap: 32px;
  grid-template-columns: 1fr auto;
  align-items: center;
}
.footer-brand { display: flex; align-items: center; gap: 16px; }
.footer-mark { width: 56px; height: 56px; object-fit: contain; }
.footer-name {
  margin: 0;
  font-family: var(--serif);
  font-size: 16px; font-weight: 600; color: var(--ink);
  letter-spacing: 0.5px;
}
.footer-sub {
  margin: 4px 0 0;
  font-size: 12px; color: var(--muted);
  letter-spacing: 0.3px;
}
.footer-nav {
  display: flex; gap: 24px;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.footer-nav a {
  font-size: 13px; color: var(--ink-soft);
  letter-spacing: 0.5px;
}
.footer-nav a:hover { color: var(--accent-deep); }
.footer-copy {
  grid-column: 1 / -1;
  margin: 24px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  text-align: center;
  font-size: 12px; color: var(--muted);
  letter-spacing: 0.5px;
}

/* ============================================================
   RESPONSIVE — 平板 / 手机
   ============================================================ */

/* Tablet (720-1023) */
@media (max-width: 1023px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-card { max-width: 560px; }
  .bots-grid { grid-template-columns: repeat(2, 1fr); }
  .services-grid { grid-template-columns: repeat(3, 1fr); }
  .services-grid .svc:nth-child(4),
  .services-grid .svc:nth-child(5) { grid-column: span 1; }
  .cloud-grid { grid-template-columns: repeat(2, 1fr); }
  .plans { grid-template-columns: repeat(2, 1fr); }
  .api-grid { grid-template-columns: repeat(3, 1fr); }
  .trustbar-inner { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .deliverables-grid { grid-template-columns: repeat(2, 1fr); }
  .support-notes { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; text-align: center; }
  .footer-brand { justify-content: center; }
  .footer-nav { justify-content: center; }
}

/* Phone (<=720) */
@media (max-width: 720px) {
  :root { --nav-h: 60px; --gap: 10px; }
  .topbar-inner { font-size: 11px; padding: 8px 16px; }
  .topbar-meta { display: none; }
  .nav-inner { padding: 14px 16px; gap: 12px; }
  .brand-name { font-size: 14px; }
  .brand-sub { display: none; }
  .brand-line1 { font-size: 13px; }
  .brand-line2 { font-size: 11px; max-width: 58vw; }
  .nav-links { display: none; }
  .nav-toggle { display: block; }
  .nav-menu.is-open { display: flex; }

  .hero { padding: 48px 16px 56px; }
  .hero-card { padding: 28px 24px; }
  .hero-card-foot { grid-template-columns: 1fr 1fr; gap: 16px; }
    .hero-card-foot > div { align-items: center; text-align: center; }
    .hero-card-foot > div:nth-child(3) { grid-column: 1 / -1; }
  .hero-actions .btn { flex: 1; justify-content: center; }

  .trustbar-inner {
    grid-template-columns: 1fr;
    padding: 24px 16px;
    gap: 16px;
  }

  .section { padding: 60px 16px; }
    .bots-grid { grid-template-columns: 1fr; }
    .services-grid { grid-template-columns: 1fr; }
  .services-grid .svc { min-height: auto; }
  .cloud-grid { grid-template-columns: 1fr; }
  .plans { grid-template-columns: 1fr; }
  .api-grid { grid-template-columns: 1fr; }
  .deliverables-grid { grid-template-columns: 1fr; }
  .step { grid-template-columns: 1fr; gap: 12px; padding: 24px 20px; }
  .step-no { font-size: 32px; }

  .add-row { grid-template-columns: 80px 1fr; }
  .add-row > span:nth-child(3) { grid-column: 2; padding-left: 0; color: var(--accent-deep); font-weight: 600; }

  /* 范围表：手机版用单列 + span 加粗，但保持"列标题"的视觉 */
  .scope-row, .scope-head { grid-template-columns: 1fr; gap: 6px; padding: 12px 14px; }
  .scope-head span { font-size: 11px; opacity: 0.9; }

  /* 费用表：手机版表头 inline 横排（更紧凑），数据保持单列 */
  .cost-row, .cost-head { grid-template-columns: 1fr; gap: 4px; padding: 12px 14px; }
  .cost-head {
    display: flex; flex-wrap: wrap; gap: 4px 14px;
    align-items: center;
  }
  .cost-head span { font-size: 11px; }

  /* 维护表：表头 inline 横排，缩小字号 */
  .sup-row, .sup-head { grid-template-columns: 1fr; padding: 10px 14px; gap: 4px; }
  .sup-head {
    display: flex; flex-wrap: wrap; gap: 6px 18px;
    align-items: center;
  }
  .sup-head .tier-b,
  .sup-head .tier-s,
  .sup-head .tier-f { font-size: 11px; }
  .sup-row > span { font-size: 13px; }
  .sup-row .lbl { font-size: 13px; }

  .faq summary { padding: 18px 18px; font-size: 15px; gap: 10px; }
  .faq-q { font-size: 15px; }
  .faq-a { padding: 0 18px 20px; font-size: 14px; }

  .cta { padding: 60px 16px; }
  .cta-actions { flex-direction: column; }
  .cta-actions .btn { width: 100%; }

  .footer { padding: 40px 16px 24px; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
  html { scroll-behavior: auto; }
}