/* ============================================================
   Appkon 官网 v1 — 设计系统
   色彩与气质延续《Appkon 商业计划书》HTML 版：青墨色系、编辑部风格。
   零外部依赖：系统字体栈，境内外均可秒开。
   ============================================================ */

:root {
  --ground: #f2f5f4;
  --surface: #fdfefe;
  --surface-sunk: #e9eeed;
  --ink: #0e1618;
  --ink-soft: #55676b;
  --ink-faint: #7c8d91;
  --rule: #d3dcdc;
  --rule-soft: #e2e8e8;
  --accent: #0b6e75;
  --accent-deep: #084f55;
  --accent-wash: #e0eeef;
  --on-accent: #f4fbfb;
  --warn: #8a5a0e;
  --warn-wash: #f5ebd9;
  --good: #1f6b4a;

  --f-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --f-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, "Cascadia Mono", Consolas, monospace;

  --max: 1120px;
  --radius: 10px;
  --shadow: 0 1px 2px rgb(14 22 24 / 0.04), 0 8px 28px rgb(14 22 24 / 0.05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --ground: #0b1113;
    --surface: #121a1c;
    --surface-sunk: #0a0f11;
    --ink: #e6eded;
    --ink-soft: #96a9ac;
    --ink-faint: #6e8286;
    --rule: #243437;
    --rule-soft: #1b282b;
    --accent: #52c4cd;
    --accent-deep: #7dd6dd;
    --accent-wash: #102a2d;
    --on-accent: #06272a;
    --warn: #d9a441;
    --warn-wash: #2a2213;
    --good: #5fbf92;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.3), 0 8px 28px rgb(0 0 0 / 0.35);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

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

/* ---------- 顶部导航 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--ground) 86%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--rule-soft);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 64px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: var(--ink);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand .zh {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--ink-faint);
  letter-spacing: 0.12em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}
.site-nav a {
  color: var(--ink-soft);
  font-size: 0.88rem;
  padding: 6px 10px;
  border-radius: 6px;
  white-space: nowrap;
}
.site-nav a:hover { color: var(--ink); background: var(--surface-sunk); text-decoration: none; }
.site-nav a.active { color: var(--accent); }

.nav-cta {
  margin-left: 8px;
  background: var(--accent);
  color: var(--on-accent) !important;
  font-weight: 600;
  padding: 8px 16px !important;
  border-radius: 999px;
}
.nav-cta:hover { background: var(--accent-deep) !important; text-decoration: none; }

.nav-toggle {
  display: none;
  margin-left: auto;
  background: none;
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 7px 10px;
  color: var(--ink);
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
}

@media (max-width: 920px) {
  .site-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--rule);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 20px 18px;
    gap: 2px;
    box-shadow: var(--shadow);
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 10px 12px; font-size: 1rem; }
  .nav-cta { margin: 10px 0 0; text-align: center; }
  .nav-toggle { display: block; }
}

/* ---------- Hero ---------- */

/* Hero 使用 AI 生成主视觉（数据边界中的神经网络），双主题下均为暗色影像区 */
.hero {
  padding: 100px 0 84px;
  border-bottom: 1px solid var(--rule-soft);
  background:
    linear-gradient(90deg, rgba(7, 13, 15, 0.94) 0%, rgba(7, 13, 15, 0.78) 42%, rgba(7, 13, 15, 0.28) 100%),
    url("img/hero.jpg") left center / cover no-repeat,
    #0a1214;
}
@media (max-width: 680px) {
  .hero {
    padding: 72px 0 64px;
    background:
      linear-gradient(rgba(7, 13, 15, 0.9), rgba(7, 13, 15, 0.86)),
      url("img/hero.jpg") 60% center / cover no-repeat,
      #0a1214;
  }
}

.hero .kicker {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: #7f989c;
  margin: 0 0 20px;
}
.hero h1 { color: #eef4f4; }
.hero h1 em { color: #5fd0d9; }
.hero .lede { color: #b9cbcd; }
.hero .btn-primary { background: #118a92; color: #f4fbfb; }
.hero .btn-primary:hover { background: #0d777e; }
.hero .btn-ghost {
  border-color: rgba(230, 237, 237, 0.35);
  color: #eef4f4;
  background: rgba(10, 16, 18, 0.35);
}
.hero .btn-ghost:hover { border-color: #52c4cd; color: #5fd0d9; }
.hero .trust { color: #93a6a9; }
.hero .trust li::before { background: #52c4cd; }

.hero h1 {
  font-size: clamp(2rem, 5.2vw, 3.3rem);
  line-height: 1.22;
  letter-spacing: 0.01em;
  font-weight: 700;
  margin: 0 0 22px;
  max-width: 21em;
}
.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.hero .lede {
  font-size: 1.12rem;
  color: var(--ink-soft);
  max-width: 44em;
  margin: 0 0 34px;
}

.cta-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }

.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.98rem;
  border: 1px solid transparent;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-deep); }
.btn-ghost { border-color: var(--rule); color: var(--ink); background: var(--surface); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.hero .trust {
  margin: 36px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  font-size: 0.84rem;
  color: var(--ink-faint);
}
.hero .trust li::before {
  content: "";
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 8px;
  vertical-align: 2px;
}

/* ---------- 区块骨架 ---------- */

.section { padding: 88px 0 0; }
.section-inner { padding-bottom: 88px; border-bottom: 1px solid var(--rule-soft); }
.section:last-of-type .section-inner { border-bottom: none; }

.eyebrow {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--accent);
  margin: 0 0 14px;
}

.section h2 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  line-height: 1.3;
  font-weight: 700;
  margin: 0 0 16px;
  max-width: 24em;
}

.section .intro {
  color: var(--ink-soft);
  max-width: 46em;
  margin: 0 0 40px;
}
.section .intro strong { color: var(--ink); }

/* ---------- 数字卡 ---------- */

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 0 0 28px;
}
@media (max-width: 920px) { .stats { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .stats { grid-template-columns: 1fr; } }

.stat {
  background: var(--surface);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  padding: 22px 20px 18px;
}
.stat .num {
  font-family: var(--f-mono);
  font-size: 1.9rem;
  font-weight: 600;
  color: var(--accent);
  line-height: 1.1;
  letter-spacing: -0.01em;
}
.stat .num small { font-size: 1.05rem; color: var(--ink-soft); font-weight: 500; }
.stat .label { margin: 10px 0 2px; font-size: 0.92rem; line-height: 1.55; }
.stat .src {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
}

.note {
  font-size: 0.85rem;
  color: var(--ink-faint);
  max-width: 52em;
}

/* ---------- 卡片网格 ---------- */

.cards-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.cards-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
@media (max-width: 920px) { .cards-3 { grid-template-columns: 1fr; } .cards-2 { grid-template-columns: 1fr; } }

.card {
  background: var(--surface);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  padding: 28px 26px;
}
.card h3 {
  margin: 0 0 10px;
  font-size: 1.08rem;
  display: flex;
  align-items: center;
  gap: 10px;
}
.card h3 .idx {
  font-family: var(--f-mono);
  font-size: 0.72rem;
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  border-radius: 999px;
  padding: 2px 9px;
  letter-spacing: 0.08em;
  flex: none;
}
.card p { margin: 0; color: var(--ink-soft); font-size: 0.94rem; }
.card p strong { color: var(--ink); }
.card .fine {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--rule);
  font-size: 0.84rem;
  color: var(--ink-faint);
}

/* 行业卡片：AI 生成配图 + 文字体 */
.card.industry { padding: 0; overflow: hidden; display: flex; flex-direction: column; }
.card.industry .card-media {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  display: block;
  border-bottom: 1px solid var(--rule-soft);
}
.card.industry .card-body { padding: 20px 24px 24px; }

/* ---------- 一体机救援 ---------- */

/* 救援区使用 AI 生成的一体机机房影像作背景，双主题下均为暗色影像区 */
.rescue-band {
  background:
    linear-gradient(180deg, rgba(8, 14, 16, 0.9), rgba(8, 14, 16, 0.84)),
    url("img/rescue.jpg") center 38% / cover no-repeat,
    #0a1214;
  border: 1px solid #1d2f32;
  border-radius: 14px;
  padding: 44px 40px;
  box-shadow: var(--shadow);
  color: #dde8e8;
}
.rescue-band .rescue-quote { border-color: #52c4cd; color: #eef4f4; }
.rescue-band .rescue-quote small { color: #8fa4a7; }
.rescue-band .step {
  background: rgba(12, 19, 21, 0.78);
  border-color: rgba(230, 237, 237, 0.12);
}
.rescue-band .step h3 { color: #eef4f4; }
.rescue-band .step p { color: #a7babd; }
.rescue-band .step::before { color: #5fd0d9; }
.rescue-band .step .price { color: #5fd0d9; background: rgba(82, 196, 205, 0.14); }
@media (max-width: 680px) { .rescue-band { padding: 30px 22px; } }

.rescue-quote {
  border-left: 3px solid var(--accent);
  padding: 4px 0 4px 20px;
  margin: 0 0 34px;
  font-size: 1.25rem;
  line-height: 1.6;
  font-weight: 600;
  max-width: 30em;
}
.rescue-quote small {
  display: block;
  margin-top: 8px;
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--ink-faint);
}

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; counter-reset: step; }
@media (max-width: 920px) { .steps { grid-template-columns: 1fr; } }

.step {
  position: relative;
  background: var(--ground);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  padding: 24px 22px 20px;
  counter-increment: step;
}
.step::before {
  content: "0" counter(step);
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--accent);
}
.step h3 { margin: 8px 0 6px; font-size: 1.02rem; }
.step p { margin: 0; font-size: 0.9rem; color: var(--ink-soft); }
.step .price {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--f-mono);
  font-size: 0.86rem;
  color: var(--accent);
  background: var(--accent-wash);
  border-radius: 6px;
  padding: 3px 10px;
}

/* ---------- 定价表 ---------- */

.price-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-bottom: 18px; }
@media (max-width: 920px) { .price-grid { grid-template-columns: 1fr; } }

.price-card {
  background: var(--surface);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  padding: 26px 26px 22px;
  display: flex;
  flex-direction: column;
}
.price-card.lead { border-color: color-mix(in srgb, var(--accent) 45%, var(--rule)); }
.price-card .role {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 8px;
}
.price-card h3 { margin: 0 0 4px; font-size: 1.06rem; }
.price-card .band {
  font-family: var(--f-mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--ink);
  margin: 6px 0 2px;
}
.price-card .band small { font-size: 0.85rem; font-weight: 400; color: var(--ink-faint); margin-left: 8px; }
.price-card p { margin: 10px 0 0; font-size: 0.9rem; color: var(--ink-soft); }

table.plain {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 0.9rem;
}
table.plain th, table.plain td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--rule-soft);
  vertical-align: top;
}
table.plain tr:last-child td { border-bottom: none; }
table.plain th {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  font-weight: 600;
  background: var(--surface-sunk);
}
table.plain td.num { font-family: var(--f-mono); white-space: nowrap; color: var(--accent); }

.table-scroll { overflow-x: auto; border-radius: var(--radius); }

/* ---------- 流程时间线 ---------- */

.flow {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 12px;
  margin: 0 0 36px;
}
@media (max-width: 920px) { .flow { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .flow { grid-template-columns: 1fr; } }

.flow .f {
  background: var(--surface);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  padding: 16px 14px 14px;
}
.flow .f .n {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.1em;
}
.flow .f h3 { margin: 6px 0 4px; font-size: 0.94rem; }
.flow .f p { margin: 0; font-size: 0.8rem; color: var(--ink-faint); }

.deliverables {
  columns: 2;
  column-gap: 40px;
  margin: 0;
  padding: 0 0 0 1.2em;
  font-size: 0.93rem;
  color: var(--ink-soft);
}
@media (max-width: 680px) { .deliverables { columns: 1; } }
.deliverables li { margin-bottom: 8px; break-inside: avoid; }
.deliverables li strong { color: var(--ink); }

/* ---------- Konbase 模块 ---------- */

.modules { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
@media (max-width: 920px) { .modules { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .modules { grid-template-columns: 1fr; } }

.module {
  background: var(--surface);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  padding: 20px 18px 16px;
}
.module h3 { margin: 0 0 6px; font-size: 0.96rem; }
.module p { margin: 0; font-size: 0.82rem; color: var(--ink-faint); }
.module .tag {
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  color: var(--warn);
  background: var(--warn-wash);
  border-radius: 5px;
  padding: 2px 7px;
  margin-bottom: 8px;
}
.module .tag.core { color: var(--accent); background: var(--accent-wash); }

/* ---------- 合规 ---------- */

.order-line {
  font-size: 1.15rem;
  font-weight: 600;
  font-family: var(--f-mono);
  letter-spacing: 0.02em;
  background: var(--surface);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 0 0 10px;
  overflow-x: auto;
  white-space: nowrap;
}
.order-line .gt { color: var(--ink-faint); padding: 0 10px; }
.order-line .hot { color: var(--accent); }

.check-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px 28px;
  font-size: 0.93rem;
}
@media (max-width: 680px) { .check-list { grid-template-columns: 1fr; } }
.check-list li { padding-left: 26px; position: relative; color: var(--ink-soft); }
.check-list li strong { color: var(--ink); }
.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0; top: 0;
  color: var(--good);
  font-weight: 700;
}

/* ---------- FAQ ---------- */

.faq { border-top: 1px solid var(--rule); }
.faq details { border-bottom: 1px solid var(--rule-soft); }
.faq summary {
  cursor: pointer;
  padding: 18px 34px 18px 4px;
  font-weight: 600;
  font-size: 1rem;
  list-style: none;
  position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--f-mono);
  font-size: 1.2rem;
  color: var(--ink-faint);
}
.faq details[open] summary::after { content: "−"; color: var(--accent); }
.faq .a {
  padding: 0 4px 20px;
  color: var(--ink-soft);
  font-size: 0.94rem;
  max-width: 52em;
}
.faq .a strong { color: var(--ink); }

/* ---------- 关于 ---------- */

.about-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 18px; }
@media (max-width: 920px) { .about-grid { grid-template-columns: 1fr; } }

.nots { list-style: none; margin: 0; padding: 0; font-size: 0.92rem; color: var(--ink-soft); }
.nots li { padding: 7px 0 7px 26px; position: relative; }
.nots li::before {
  content: "×";
  position: absolute;
  left: 2px;
  color: var(--warn);
  font-weight: 700;
  font-family: var(--f-mono);
}

/* ---------- 联系 ---------- */

.contact-band {
  background: var(--ink);
  color: var(--ground);
  border-radius: 14px;
  padding: 52px 44px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 28px 48px;
}
@media (prefers-color-scheme: dark) {
  .contact-band { background: var(--surface); border: 1px solid var(--rule); color: var(--ink); }
}
@media (max-width: 680px) { .contact-band { padding: 34px 24px; } }

.contact-band h2 { margin: 0 0 10px; font-size: 1.5rem; }
.contact-band p { margin: 0; opacity: 0.75; font-size: 0.95rem; max-width: 30em; }
.contact-band .main { flex: 1 1 380px; }
.contact-band .actions { display: flex; flex-direction: column; gap: 12px; }
.contact-band .btn-primary { text-align: center; }
.contact-band .mail {
  font-family: var(--f-mono);
  font-size: 0.9rem;
  text-align: center;
  color: inherit;
  opacity: 0.85;
}

/* ---------- Footer ---------- */

.site-footer {
  margin-top: 88px;
  border-top: 1px solid var(--rule);
  background: var(--surface-sunk);
  padding: 40px 0 48px;
  font-size: 0.84rem;
  color: var(--ink-faint);
}
.site-footer .cols {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 56px;
  justify-content: space-between;
  align-items: flex-start;
}
.site-footer .fbrand { font-weight: 700; color: var(--ink); font-size: 1rem; }
.site-footer .fbrand small { display: block; font-weight: 400; color: var(--ink-faint); margin-top: 4px; font-size: 0.8rem; }
.site-footer .en { font-family: var(--f-mono); font-size: 0.72rem; letter-spacing: 0.05em; margin-top: 10px; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 4px 20px; }
.site-footer nav a { color: var(--ink-soft); }
.site-footer .legal { margin-top: 26px; padding-top: 18px; border-top: 1px solid var(--rule-soft); }
.site-footer .legal a { color: var(--ink-faint); }

/* ---------- 工具 ---------- */

.mt-lg { margin-top: 44px; }
.mt-md { margin-top: 28px; }

:target { scroll-margin-top: 84px; }
section[id] { scroll-margin-top: 64px; }