/* =========================================================
   享定 XiangDing · 官网样式表
   设计基调：深墨蓝底 + 青绿渐变，数据感、基础设施感
   结构：1.变量 2.重置 3.排版 4.布局 5.组件 6.页面级 7.响应式
   ========================================================= */

/* ---------- 1. 变量 ---------- */
:root {
  --bg: #060a11;
  --bg-soft: #0a111a;
  --panel: #0c1620;
  --panel-2: #0f1c27;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);

  --text: #e9f1f5;
  --text-2: #b7c7d1;
  --muted: #7f939f;

  --teal: #2fe3b5;
  --teal-deep: #12b39a;
  --cyan: #4fd1ff;
  --violet: #8b8cf0;

  --grad: linear-gradient(120deg, #2fe3b5 0%, #4fd1ff 100%);
  --grad-soft: linear-gradient(120deg, rgba(47, 227, 181, 0.16), rgba(79, 209, 255, 0.06));

  --r-sm: 10px;
  --r: 16px;
  --r-lg: 24px;

  --shadow: 0 24px 60px -20px rgba(0, 0, 0, 0.7);
  --shadow-glow: 0 0 0 1px rgba(47, 227, 181, 0.25), 0 20px 60px -24px rgba(47, 227, 181, 0.45);

  --container: 1200px;
  --nav-h: 68px;

  --font: "Inter", "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", Consolas, "Liberation Mono", monospace;
}

/* ---------- 2. 重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--nav-h) + 24px);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5, p, figure, blockquote { margin: 0; }
table { border-collapse: collapse; width: 100%; }

::selection { background: rgba(47, 227, 181, 0.28); color: #fff; }

:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
  border-radius: 4px;
}

/* 滚动条 */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: #070c13; }
::-webkit-scrollbar-thumb {
  background: #1b2b38;
  border-radius: 99px;
  border: 2px solid #070c13;
}
::-webkit-scrollbar-thumb:hover { background: #27414f; }

/* ---------- 3. 排版 ---------- */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.022em;
  color: #fff;
}

h1, h2 { text-wrap: balance; }

.h-hero {
  font-size: clamp(2.1rem, 5.2vw, 3.9rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.h1 { font-size: clamp(1.9rem, 3.9vw, 3rem); }
.h2 { font-size: clamp(1.55rem, 2.9vw, 2.35rem); }
.h3 { font-size: clamp(1.1rem, 1.7vw, 1.32rem); }
.h4 { font-size: 1.02rem; }

.lead {
  font-size: clamp(1rem, 1.35vw, 1.14rem);
  line-height: 1.8;
  color: var(--text-2);
}

.muted { color: var(--muted); }
.small { font-size: 0.84rem; line-height: 1.65; }
.tiny { font-size: 0.76rem; line-height: 1.6; }

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.nowrap { white-space: nowrap; }

/* ---------- 4. 布局 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  position: relative;
  padding-block: clamp(64px, 9vw, 118px);
}

.section--tight { padding-block: clamp(48px, 6vw, 76px); }

.section--alt {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.018), rgba(255, 255, 255, 0));
  border-block: 1px solid var(--line);
}

.sec-head {
  max-width: 780px;
  margin-bottom: clamp(32px, 4.5vw, 56px);
}

.sec-head--center {
  margin-inline: auto;
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 16px;
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--teal);
  opacity: 0.8;
}

.sec-head--center .eyebrow::before { display: none; }

.sec-head .h2 { margin-bottom: 14px; }
.sec-head .lead { max-width: 680px; }
.sec-head--center .lead { margin-inline: auto; }

.grid { display: grid; gap: 18px; }
.g-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.stack { display: flex; flex-direction: column; }
.row { display: flex; flex-wrap: wrap; align-items: center; }

/* ---------- 5. 组件 ---------- */

/* 5.1 按钮 */
.btn {
  --btn-bg: transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  height: 50px;
  padding: 0 26px;
  border-radius: 99px;
  border: 1px solid var(--line-strong);
  background: var(--btn-bg);
  font-size: 0.94rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
  transition: transform 0.22s ease, box-shadow 0.22s ease, background 0.22s ease,
    border-color 0.22s ease, color 0.22s ease;
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--grad);
  border-color: transparent;
  color: #04140f;
  box-shadow: 0 14px 34px -14px rgba(47, 227, 181, 0.75);
}
.btn--primary:hover { box-shadow: 0 20px 44px -14px rgba(47, 227, 181, 0.9); }

.btn--ghost {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
}
.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.28);
}

.btn--sm { height: 40px; padding: 0 18px; font-size: 0.86rem; }

.btn--link {
  height: auto;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: none;
  color: var(--teal);
  font-size: 0.92rem;
}
.btn--link:hover { transform: none; color: #7bf0d5; }
.btn--link::after {
  content: "→";
  transition: transform 0.2s ease;
}
.btn--link:hover::after { transform: translateX(4px); }

.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }

/* 5.2 徽标 / 标签 */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 32px;
  padding: 0 14px;
  border-radius: 99px;
  border: 1px solid rgba(47, 227, 181, 0.28);
  background: rgba(47, 227, 181, 0.07);
  color: #9df3e0;
  font-size: 0.79rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.pill__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 3px rgba(47, 227, 181, 0.18);
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  font-size: 0.74rem;
  color: var(--text-2);
  letter-spacing: 0.02em;
}

/* 5.3 卡片 */
.card {
  position: relative;
  padding: 26px;
  border-radius: var(--r);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.012));
  transition: border-color 0.28s ease, transform 0.28s ease, background 0.28s ease;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(47, 227, 181, 0.55), transparent);
  opacity: 0;
  transition: opacity 0.28s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: rgba(47, 227, 181, 0.28);
  background: linear-gradient(160deg, rgba(47, 227, 181, 0.07), rgba(255, 255, 255, 0.015));
}
.card:hover::before { opacity: 1; }

.card__icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  border: 1px solid rgba(47, 227, 181, 0.24);
  background: rgba(47, 227, 181, 0.09);
  color: var(--teal);
  margin-bottom: 18px;
}
.card__icon svg { width: 21px; height: 21px; }

.card .h3 { margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 0.92rem; line-height: 1.75; }

.card__num {
  position: absolute;
  top: 18px;
  right: 22px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.22);
  letter-spacing: 0.08em;
}

.card--flat {
  background: rgba(255, 255, 255, 0.022);
}
.card--flat:hover { transform: none; }

/* 5.4 数据块 */
.stat {
  padding: 22px 24px;
  border-radius: var(--r);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.022);
}
.stat__v {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  color: #fff;
  line-height: 1.15;
}
.stat__v small { font-size: 0.5em; font-weight: 500; margin-left: 4px; color: var(--text-2); }
.stat__l { margin-top: 6px; font-size: 0.82rem; color: var(--muted); line-height: 1.55; }

/* 5.5 列表 */
.ticks { display: grid; gap: 11px; }
.ticks li {
  position: relative;
  padding-left: 26px;
  font-size: 0.91rem;
  color: var(--text-2);
  line-height: 1.7;
}
.ticks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 14px;
  height: 8px;
  border-left: 1.6px solid var(--teal);
  border-bottom: 1.6px solid var(--teal);
  transform: rotate(-45deg);
  opacity: 0.85;
}

.ticks--tight { gap: 7px; }
.ticks--tight li { font-size: 0.86rem; }

.dots { display: grid; gap: 10px; }
.dots li {
  position: relative;
  padding-left: 18px;
  font-size: 0.9rem;
  color: var(--muted);
}
.dots li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: rgba(47, 227, 181, 0.7);
}

/* 5.6 表格式对比 */
.compare {
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.018);
}
.compare table { font-size: 0.88rem; }
.compare th,
.compare td {
  padding: 15px 20px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: middle;
}
.compare thead th {
  font-size: 0.79rem;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: rgba(255, 255, 255, 0.03);
  white-space: nowrap;
}
.compare tbody th {
  font-weight: 500;
  color: var(--text-2);
  white-space: nowrap;
}
.compare td { color: var(--muted); }
.compare tbody tr:last-child th,
.compare tbody tr:last-child td { border-bottom: 0; }
.compare col.is-us,
.compare .is-us {
  background: rgba(47, 227, 181, 0.06);
  color: var(--text);
  font-weight: 500;
}
.compare thead .is-us {
  color: var(--teal);
  background: rgba(47, 227, 181, 0.1);
  text-transform: none;
  letter-spacing: 0.02em;
  font-size: 0.82rem;
}

/* 5.7 流程步骤 */
.flow {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 0;
  border-radius: var(--r);
  border: 1px solid var(--line);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.02);
}
.flow__i {
  position: relative;
  padding: 24px 18px;
  border-right: 1px solid var(--line);
  transition: background 0.26s ease;
}
.flow__i:last-child { border-right: 0; }
.flow__i:hover { background: rgba(47, 227, 181, 0.06); }
.flow__n {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--teal);
  letter-spacing: 0.14em;
  margin-bottom: 10px;
}
.flow__t { font-size: 0.9rem; font-weight: 600; color: #fff; margin-bottom: 5px; }
.flow__d { font-size: 0.78rem; color: var(--muted); line-height: 1.55; }

.flow--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.flow--5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.flow--6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }

/* 5.8 时间线 / 阶段 */
.stages { display: grid; gap: 16px; grid-template-columns: repeat(3, 1fr); }
.stage {
  position: relative;
  padding: 26px 24px 24px;
  border-radius: var(--r);
  border: 1px solid var(--line);
  background: linear-gradient(165deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01));
}
.stage__k {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--teal);
}
.stage__h { margin: 10px 0 4px; font-size: 1.06rem; }
.stage__p { font-size: 0.84rem; color: var(--muted); }

/* 5.9 定价卡 */
.plan {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 32px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: linear-gradient(170deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.012));
}
.plan--feature {
  border-color: rgba(47, 227, 181, 0.34);
  background: linear-gradient(170deg, rgba(47, 227, 181, 0.1), rgba(255, 255, 255, 0.015));
  box-shadow: var(--shadow-glow);
}
.plan__badge {
  position: absolute;
  top: -12px;
  right: 26px;
  height: 25px;
  padding: 0 12px;
  display: grid;
  place-items: center;
  border-radius: 99px;
  background: var(--grad);
  color: #04140f;
  font-size: 0.71rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.plan__name { font-size: 1.15rem; font-weight: 700; color: #fff; }
.plan__sub { font-size: 0.82rem; color: var(--muted); margin-top: 6px; min-height: 44px; }
.plan__price {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 18px 0 4px;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 3vw, 2.5rem);
  font-weight: 600;
  color: #fff;
  letter-spacing: -0.04em;
}
.plan__price span { font-family: var(--font); font-size: 0.86rem; font-weight: 400; color: var(--muted); letter-spacing: 0; }
.plan__hr { height: 1px; background: var(--line); margin: 22px 0; }
.plan .btn { margin-top: auto; width: 100%; }
.plan .ticks { margin-bottom: 26px; }

/* 5.10 FAQ */
.faq { border-top: 1px solid var(--line); }
.faq__i { border-bottom: 1px solid var(--line); }
.faq__q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 20px 0;
  background: none;
  border: 0;
  text-align: left;
  font-size: 0.98rem;
  font-weight: 500;
  color: var(--text);
  transition: color 0.2s ease;
}
.faq__q:hover { color: var(--teal); }
.faq__q::after {
  content: "+";
  flex: none;
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--teal);
  transition: transform 0.26s ease;
}
.faq__i.is-open .faq__q::after { transform: rotate(45deg); }
.faq__a {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s ease;
}
.faq__i.is-open .faq__a { grid-template-rows: 1fr; }
.faq__a > div { overflow: hidden; }
.faq__a p {
  padding-bottom: 22px;
  max-width: 820px;
  font-size: 0.91rem;
  line-height: 1.8;
  color: var(--muted);
}

/* 5.11 表单 */
.form { display: grid; gap: 16px; }
.field { display: grid; gap: 7px; }
.field > label { font-size: 0.82rem; color: var(--text-2); font-weight: 500; }
.field .req { color: var(--teal); }

.input,
.select,
.textarea {
  width: 100%;
  padding: 13px 15px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.028);
  color: var(--text);
  font: inherit;
  font-size: 0.92rem;
  transition: border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}
.input::placeholder,
.textarea::placeholder { color: #63757f; }
.input:focus,
.select:focus,
.textarea:focus {
  outline: 0;
  border-color: rgba(47, 227, 181, 0.6);
  background: rgba(47, 227, 181, 0.05);
  box-shadow: 0 0 0 3px rgba(47, 227, 181, 0.12);
}
.select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, #7f939f 50%), linear-gradient(135deg, #7f939f 50%, transparent 50%); background-position: calc(100% - 20px) 50%, calc(100% - 14px) 50%; background-size: 6px 6px, 6px 6px; background-repeat: no-repeat; }
.textarea { min-height: 128px; resize: vertical; }
.select option { background: #0c1620; color: var(--text); }
.field.is-error .input,
.field.is-error .select,
.field.is-error .textarea { border-color: #f2708a; }
.field__err { display: none; font-size: 0.76rem; color: #f2708a; }
.field.is-error .field__err { display: block; }
.form__note { font-size: 0.78rem; color: var(--muted); }
.form__ok {
  display: none;
  padding: 16px 18px;
  border-radius: var(--r-sm);
  border: 1px solid rgba(47, 227, 181, 0.4);
  background: rgba(47, 227, 181, 0.1);
  font-size: 0.88rem;
  color: #b8f7e8;
}
.form__ok.is-show { display: block; }
.form__err {
  display: none;
  padding: 14px 18px;
  margin-bottom: 14px;
  border-radius: var(--r-sm);
  border: 1px solid rgba(255, 108, 108, 0.42);
  background: rgba(255, 108, 108, 0.1);
  font-size: 0.86rem;
  color: #ffc2c2;
}
.form__err.is-show { display: block; }
.form__err a { color: #ffd9a8; text-decoration: underline; }
.hp { position: absolute; left: -9999px; opacity: 0; pointer-events: none; }

/* 5.12 头部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  height: var(--nav-h);
  border-bottom: 1px solid transparent;
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
}
.site-header.is-scrolled {
  background: rgba(6, 10, 17, 0.82);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom-color: var(--line);
}
.nav {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 28px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; flex: none; }
.brand__mark {
  width: 36px;
  height: 36px;
  flex: none;
  object-fit: contain;
  background: linear-gradient(145deg, #ffffff 0%, #e9eef3 100%);
  border-radius: 9px;
  padding: 4px;
  box-sizing: border-box;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.35);
}
.brand__txt { display: flex; flex-direction: column; line-height: 1; }
.brand__cn { font-size: 1.06rem; font-weight: 700; letter-spacing: 0.04em; color: #fff; }
.brand__en {
  font-size: 0.58rem;
  letter-spacing: 0.24em;
  color: var(--muted);
  margin-top: 4px;
  text-transform: uppercase;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 12px;
}
.nav__links a {
  position: relative;
  padding: 8px 13px;
  border-radius: 8px;
  font-size: 0.88rem;
  color: var(--text-2);
  transition: color 0.2s ease, background 0.2s ease;
}
.nav__links a:hover { color: #fff; background: rgba(255, 255, 255, 0.05); }
.nav__links a.is-active { color: #fff; }
.nav__links a.is-active::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 2px;
  height: 1px;
  background: var(--grad);
}

.nav__right { margin-left: auto; display: flex; align-items: center; gap: 10px; }

.lang {
  display: inline-flex;
  align-items: center;
  height: 32px;
  padding: 3px;
  border-radius: 99px;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.03);
  font-size: 0.76rem;
}
.lang button {
  height: 24px;
  padding: 0 10px;
  border: 0;
  border-radius: 99px;
  background: none;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 600;
  transition: color 0.2s ease, background 0.2s ease;
}
.lang button.is-on { background: rgba(47, 227, 181, 0.16); color: var(--teal); }

.nav__toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.04);
  align-items: center;
  justify-content: center;
}
.nav__toggle span {
  position: relative;
  width: 16px;
  height: 1.5px;
  background: var(--text);
  transition: transform 0.25s ease, background 0.25s ease;
}
.nav__toggle span::before,
.nav__toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1.5px;
  background: inherit;
  transition: transform 0.25s ease, top 0.25s ease;
}
.nav__toggle span::before { top: -5px; }
.nav__toggle span::after { top: 5px; }
.nav.is-open .nav__toggle span { background: transparent; }
.nav.is-open .nav__toggle span::before { top: 0; transform: rotate(45deg); }
.nav.is-open .nav__toggle span::after { top: 0; transform: rotate(-45deg); }

/* 5.13 页脚 */
.site-footer {
  position: relative;
  padding-top: 72px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.012), rgba(0, 0, 0, 0.4));
  overflow: hidden;
}
.footer__top {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 56px;
}
.footer__brand p { max-width: 300px; margin-top: 16px; font-size: 0.86rem; color: var(--muted); line-height: 1.8; }
.footer__col h4 {
  font-size: 0.79rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 18px;
}
.footer__col ul { display: grid; gap: 11px; }
.footer__col a {
  font-size: 0.88rem;
  color: var(--text-2);
  transition: color 0.2s ease;
}
.footer__col a:hover { color: var(--teal); }
.footer__col li > span { font-size: 0.88rem; color: var(--muted); }

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-block: 22px 26px;
  border-top: 1px solid var(--line);
  font-size: 0.78rem;
  color: #5f727d;
}
.footer__bottom a { color: #5f727d; }
.footer__bottom a:hover { color: var(--text-2); }

.footer__icp {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #5f727d;
  font-size: 0.78rem;
  text-decoration: none;
  transition: color 0.2s ease;
}
.footer__icp::before {
  content: "";
  width: 12px;
  height: 12px;
  flex: none;
  opacity: 0.75;
  background: currentColor;
  -webkit-mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M12 1 3 5v6c0 5.55 3.84 10.74 9 12 5.16-1.26 9-6.45 9-12V5l-9-4Zm0 10.99h7c-.53 4.12-3.28 7.79-7 8.94V12H5V6.3l7-3.11v8.8Z'/></svg>") center/contain no-repeat;
  mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M12 1 3 5v6c0 5.55 3.84 10.74 9 12 5.16-1.26 9-6.45 9-12V5l-9-4Zm0 10.99h7c-.53 4.12-3.28 7.79-7 8.94V12H5V6.3l7-3.11v8.8Z'/></svg>") center/contain no-repeat;
}
.footer__icp:hover { color: #9fb3bf; }

/* 5.14 通用装饰 */
.bg-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(255, 255, 255, 0.032) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.032) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 20%, transparent 75%);
}

.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
  opacity: 0.5;
}
.glow--a { width: 520px; height: 520px; background: rgba(47, 227, 181, 0.16); top: -180px; left: -120px; }
.glow--b { width: 460px; height: 460px; background: rgba(79, 209, 255, 0.12); top: -100px; right: -140px; }

.divider { height: 1px; background: var(--line); }

/* 5.15 CTA 区块 */
.cta-band {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-lg);
  border: 1px solid rgba(47, 227, 181, 0.24);
  background: radial-gradient(120% 160% at 50% -20%, rgba(47, 227, 181, 0.22), rgba(6, 10, 17, 0.2) 60%),
    linear-gradient(180deg, #0b1a1d, #08111a);
  padding: clamp(40px, 6vw, 68px);
  text-align: center;
}
.cta-band .h2 { max-width: 720px; margin-inline: auto; }
.cta-band .lead { max-width: 620px; margin: 16px auto 30px; }
.cta-band .btn-row { justify-content: center; }

/* ---------- 6. 页面级 ---------- */

/* 6.1 首页 hero */
.hero {
  position: relative;
  padding-top: clamp(54px, 7vw, 92px);
  padding-bottom: clamp(60px, 8vw, 104px);
  overflow: hidden;
}
.hero__inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.06fr 0.94fr;
  gap: clamp(32px, 5vw, 68px);
  align-items: center;
}
.hero__badge { margin-bottom: 24px; }
.hero h1 { margin-bottom: 22px; }
.hero .lead { max-width: 520px; margin-bottom: 32px; }
.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 26px 36px;
  margin-top: 44px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}
.hero__meta div { min-width: 96px; }
.hero__meta .v {
  font-family: var(--font-mono);
  font-size: 1.32rem;
  font-weight: 600;
  color: #fff;
  letter-spacing: -0.03em;
}
.hero__meta .l { font-size: 0.76rem; color: var(--muted); margin-top: 3px; }

/* 6.2 平台栈可视化 */
.stackviz {
  position: relative;
  aspect-ratio: 1 / 0.94;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
  padding: 22px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: radial-gradient(120% 100% at 70% 0%, rgba(47, 227, 181, 0.12), transparent 60%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.008));
  box-shadow: var(--shadow);
}
.layer {
  position: relative;
  padding: 15px 18px;
  border-radius: 13px;
  border: 1px solid var(--line);
  background: rgba(10, 18, 26, 0.72);
  transition: border-color 0.3s ease, transform 0.3s ease;
}
.layer:hover { border-color: rgba(47, 227, 181, 0.34); transform: translateX(3px); }
.layer--mid {
  border-color: rgba(47, 227, 181, 0.32);
  background: linear-gradient(120deg, rgba(47, 227, 181, 0.14), rgba(79, 209, 255, 0.05));
  box-shadow: 0 0 0 1px rgba(47, 227, 181, 0.08), 0 18px 40px -22px rgba(47, 227, 181, 0.5);
}
.layer__k {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 8px;
}
.layer__k::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--teal);
}
.layer__t { font-size: 0.92rem; font-weight: 600; color: #fff; }
.layer__c {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 11px;
}
.chip {
  padding: 3px 9px;
  border-radius: 5px;
  border: 1px solid rgba(255, 255, 255, 0.09);
  background: rgba(255, 255, 255, 0.04);
  font-size: 0.71rem;
  color: var(--text-2);
  white-space: nowrap;
}
.layer--mid .chip {
  border-color: rgba(47, 227, 181, 0.24);
  background: rgba(47, 227, 181, 0.09);
  color: #b6f4e6;
}
.stackviz__flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.7rem;
  color: var(--muted);
  letter-spacing: 0.06em;
}
.stackviz__flow span { flex: 1; height: 1px; background: linear-gradient(90deg, transparent, rgba(47, 227, 181, 0.4), transparent); }

/* 6.3 双引擎 */
.engines { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.engine {
  position: relative;
  padding: 30px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.01));
  overflow: hidden;
}
.engine::after {
  content: "";
  position: absolute;
  width: 220px;
  height: 220px;
  right: -90px;
  top: -90px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 227, 181, 0.16), transparent 70%);
}
.engine__tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  letter-spacing: 0.14em;
  color: var(--teal);
  margin-bottom: 14px;
}
.engine .h3 { font-size: 1.3rem; margin-bottom: 10px; }
.engine p { font-size: 0.9rem; color: var(--muted); margin-bottom: 20px; }

/* 6.4 机制卡（带迷你图） */
.mech {
  padding: 28px;
  border-radius: var(--r);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.022);
  transition: border-color 0.28s ease, background 0.28s ease;
}
.mech:hover { border-color: rgba(47, 227, 181, 0.3); background: rgba(47, 227, 181, 0.045); }
.mech__h {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 1.08rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}
.mech__h em {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 0.72rem;
  color: var(--teal);
  letter-spacing: 0.1em;
}
.mech p { font-size: 0.88rem; color: var(--muted); line-height: 1.75; }
.mech__viz {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px dashed rgba(255, 255, 255, 0.1);
  font-size: 0.75rem;
  color: var(--text-2);
  flex-wrap: wrap;
}
.node {
  padding: 5px 10px;
  border-radius: 6px;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.04);
  font-size: 0.72rem;
  white-space: nowrap;
}
.node--on {
  border-color: rgba(47, 227, 181, 0.4);
  background: rgba(47, 227, 181, 0.12);
  color: #b6f4e6;
}
.arw { color: var(--teal); opacity: 0.7; font-size: 0.8rem; }

/* 6.5 灯塔（大引言） */
.pullquote {
  position: relative;
  padding: clamp(30px, 4vw, 46px) clamp(24px, 4vw, 54px);
  border-left: 2px solid rgba(47, 227, 181, 0.5);
  background: linear-gradient(90deg, rgba(47, 227, 181, 0.07), transparent 70%);
  border-radius: 0 var(--r) var(--r) 0;
}
.pullquote p {
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  font-weight: 600;
  line-height: 1.55;
  color: #fff;
  letter-spacing: -0.015em;
  max-width: 900px;
}
.pullquote cite {
  display: block;
  margin-top: 14px;
  font-style: normal;
  font-size: 0.8rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* 6.6 页面 hero（内页） */
.page-hero {
  position: relative;
  padding-top: clamp(48px, 6vw, 78px);
  padding-bottom: clamp(44px, 6vw, 68px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.page-hero__inner { position: relative; z-index: 2; max-width: 820px; }
.page-hero h1 { margin-bottom: 18px; }
.page-hero .lead { max-width: 640px; }
.crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.76rem;
  color: var(--muted);
  margin-bottom: 22px;
}
.crumbs a:hover { color: var(--teal); }
.crumbs span { opacity: 0.4; }

/* 6.7 双列内容块 */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 4.5vw, 60px);
  align-items: center;
}
.split--wide { grid-template-columns: 0.9fr 1.1fr; }
.split__media {
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.008));
  padding: 26px;
}

/* 6.8 人物/角色卡 */
.role {
  padding: 24px;
  border-radius: var(--r);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.022);
}
.role__k {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--teal);
  margin-bottom: 12px;
}
.role__t { font-size: 1rem; font-weight: 600; color: #fff; margin-bottom: 8px; }
.role p { font-size: 0.86rem; color: var(--muted); }

/* 6.9 KPI 网格 */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
}
.kpi {
  padding: 22px 16px;
  background: var(--bg-soft);
  text-align: center;
}
.kpi__v {
  font-family: var(--font-mono);
  font-size: 1.36rem;
  font-weight: 600;
  color: var(--teal);
  letter-spacing: -0.03em;
}
.kpi__l { font-size: 0.76rem; color: var(--muted); margin-top: 5px; line-height: 1.5; }

/* 6.10 评级阶梯 */
.grades { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.grade {
  padding: 20px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.022);
}
.grade__n { display: flex; align-items: center; gap: 8px; font-size: 0.94rem; font-weight: 700; color: #fff; margin-bottom: 8px; }
.grade__b { width: 8px; height: 8px; border-radius: 2px; }
.grade p { font-size: 0.8rem; color: var(--muted); line-height: 1.6; }
.grade--a { border-color: rgba(47, 227, 181, 0.3); background: rgba(47, 227, 181, 0.07); }
.grade--a .grade__b { background: var(--teal); }
.grade--b .grade__b { background: var(--cyan); }
.grade--c .grade__b { background: #e5c157; }
.grade--d .grade__b { background: #71808b; }

/* 6.11 产品界面示意图 */
.ui-mock {
  border-radius: 14px;
  border: 1px solid var(--line-strong);
  background: #0a131c;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.ui-mock__bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}
.ui-mock__bar i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.16);
}
.ui-mock__bar span {
  margin-left: 10px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--muted);
}
.ui-mock__body { padding: 16px; display: grid; gap: 10px; }
.ui-row {
  display: grid;
  grid-template-columns: 42px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.025);
}
.ui-row__thumb {
  width: 42px;
  height: 32px;
  border-radius: 5px;
  background: linear-gradient(135deg, rgba(47, 227, 181, 0.3), rgba(79, 209, 255, 0.16));
}
.ui-row__t { font-size: 0.78rem; color: var(--text-2); }
.ui-row__s { font-size: 0.68rem; color: var(--muted); margin-top: 2px; }
.ui-row__v { font-family: var(--font-mono); font-size: 0.76rem; color: var(--teal); }

/* 6.12 首屏网络画布 */
#heroCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.55;
  pointer-events: none;
  z-index: 1;
}

/* 6.13 滚动入场 */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}
.reveal.is-in { opacity: 1; transform: none; }
.reveal[data-d="1"] { transition-delay: 0.07s; }
.reveal[data-d="2"] { transition-delay: 0.14s; }
.reveal[data-d="3"] { transition-delay: 0.21s; }
.reveal[data-d="4"] { transition-delay: 0.28s; }

/* 6.14 联系页信息块 */
.info-list { display: grid; gap: 2px; }
.info {
  display: flex;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}
.info:last-child { border-bottom: 0; }
.info__k {
  flex: none;
  width: 92px;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  padding-top: 2px;
}
.info__v { font-size: 0.94rem; color: var(--text); line-height: 1.7; }
.info__v a:hover { color: var(--teal); }

/* ---------- 7. 响应式 ---------- */
@media (max-width: 1080px) {
  .hero__inner { grid-template-columns: 1fr; gap: 44px; }
  .hero .lead { max-width: none; }
  .stackviz { max-width: 560px; aspect-ratio: auto; }
  .footer__top { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer__brand { grid-column: 1 / -1; }
  .nav__links a { padding: 8px 10px; font-size: 0.84rem; }
  .g-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .flow { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .flow--5, .flow--6 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .flow__i { border-bottom: 1px solid var(--line); }
  .kpi-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 860px) {
  .nav__links {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    margin: 0;
    padding: 14px 20px 26px;
    background: rgba(6, 10, 17, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--line);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
  }
  .nav.is-open .nav__links { opacity: 1; transform: none; visibility: visible; }
  .nav__links a { padding: 13px 12px; font-size: 0.95rem; border-radius: 10px; }
  .nav__links a.is-active::after { display: none; }
  .nav__links a.is-active { background: rgba(47, 227, 181, 0.1); color: var(--teal); }
  .nav__toggle { display: flex; }

  .g-2, .g-3, .g-4 { grid-template-columns: 1fr; }
  .engines { grid-template-columns: 1fr; }
  .split, .split--wide { grid-template-columns: 1fr; gap: 30px; }
  .stages { grid-template-columns: 1fr; }
  .grades { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__top { grid-template-columns: 1fr 1fr; gap: 32px; }
  .compare { overflow-x: auto; }
  .compare table { min-width: 640px; }
  .hero__meta { gap: 20px 28px; }
}

@media (max-width: 540px) {
  .container { padding-inline: 18px; }
  .card, .mech, .engine, .plan { padding: 22px; }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: 1fr; }
  .flow__i { border-right: 0; }
  .footer__top { grid-template-columns: 1fr; }
  .btn { width: 100%; }
  .btn-row { flex-direction: column; align-items: stretch; }
  .lang { display: none; }
  .nav__right .btn { width: auto; }
}

/* 打印 / 无障碍 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}