/* 官网样式：首页 / features / license / developers / 404
   视觉对齐 opc.qianqianai.com：炭黑 × 冷纸白，信号绿点缀。
   token 覆盖集中在 tokens-site.css（颜色/间距），本文件不再定义变量。 */

@import url("/tokens-site.css?v=20260912fe");

/* ============ base ============ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  font-family: var(--font);
  font-size: var(--fs-md);
  line-height: var(--lh-body);
  color: var(--ink);
  background: var(--page-wash);
  background-color: var(--paper);
  background-size: 52px 52px, 52px 52px, auto, auto;
  -webkit-font-smoothing: antialiased;
}
::selection { background: rgba(var(--signal-rgb), 0.22); color: var(--ink); }
main { flex: 1 0 auto; }
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--signal); }
h1, h2, h3, h4 { line-height: var(--lh-tight); font-weight: var(--fw-bd); }
p { margin: 0 0 var(--sp-4); }
:focus-visible { outline: none; box-shadow: var(--focus); border-radius: var(--r-sm); }

.wrap { width: min(var(--wrap), calc(100% - 3rem)); margin: 0 auto; }
.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--ink); color: var(--paper); padding: 10px 16px;
}
.skip:focus { left: 0; text-decoration: none; }

/* ============ section ============ */
.section { padding: 4.5rem 0; border-top: 1px solid var(--line); }
.section--tight { padding: 3rem 0; }
.section--flush-top { padding-top: 0; border-top: 0; }
.section--soft { background: color-mix(in srgb, var(--panel) 70%, transparent); }
.head { max-width: 44em; margin: 0 0 2rem; }
.head h2 {
  margin: 0 0 0.55rem;
  font-size: clamp(1.7rem, 3.2vw, 2.35rem);
  letter-spacing: 0.02em;
}
.kicker, .section-kicker {
  display: inline-block;
  margin: 0 0 0.55rem;
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.sub, .section-lead {
  margin: 0;
  max-width: 36rem;
  color: var(--muted);
  font-size: var(--fs-lg);
  line-height: var(--lh-snug);
}

/* ============ nav ============ */
.nav {
  position: sticky; top: 0; z-index: 40;
  flex-shrink: 0;
  background: var(--header);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
  box-shadow: inset 0 1px 0 rgba(var(--signal-rgb), 0.45);
}
.nav-inner { display: flex; align-items: center; gap: 0.75rem; min-height: 4rem; }
.brand {
  display: flex; align-items: center; gap: 0.45rem;
  color: var(--ink); font-weight: 700; margin-right: 1.25rem; white-space: nowrap;
  letter-spacing: 0.02em; font-size: 0.98rem;
}
.brand:hover { text-decoration: none; color: var(--ink); }
.brand img { width: 1.85rem; height: 1.85rem; border-radius: 2px; }
.nav-links {
  display: flex; align-items: center; align-self: stretch;
  gap: clamp(1.1rem, 1.8vw, 1.85rem);
  margin-right: 0;
}
.nav-links > a,
.nav-parent {
  color: var(--muted);
  padding: 0.25rem 0.1rem;
  font-size: 0.88rem;
  font-weight: 500;
  white-space: nowrap;
  position: relative;
  transition: color var(--dur) var(--ease);
}
.nav-parent {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.nav-links > a:hover,
.nav-parent:hover { color: var(--ink); text-decoration: none; }
.nav-links > a.is-on,
.nav-parent.is-on { color: var(--ink); }
.nav-links > a.is-on::after,
.nav-parent.is-on::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -0.55rem;
  height: 1px;
  background: var(--signal);
}
.nav-caret {
  width: 0.38rem; height: 0.38rem;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-1px);
  opacity: 0.5;
}
.nav-item {
  position: relative;
  display: flex;
  align-items: center;
  align-self: stretch;
}
.nav-drop {
  display: none;
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  min-width: 10.5rem;
  padding: 0.4rem 0;
  background: var(--panel);
  border: 1px solid var(--line);
  z-index: 50;
  text-align: center;
}
.nav-drop::before {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 100%;
  height: 0.75rem;
}
.nav-item:hover .nav-drop,
.nav-item:focus-within .nav-drop {
  display: flex;
  flex-direction: column;
}
.nav-drop a {
  color: var(--muted);
  padding: 0.55rem 1rem;
  font-size: 0.86rem;
  font-weight: 500;
  white-space: nowrap;
}
.nav-drop a:hover { color: var(--ink); text-decoration: none; background: var(--bg); }
.nav-drop a.is-on { color: var(--ink); background: var(--bg); }
.nav-cta { flex: none; white-space: nowrap; order: 3; }
.theme-toggle {
  order: 2;
  position: relative;
  z-index: 2;
  margin-left: auto;
  width: 2.5rem; height: 2.5rem; padding: 0;
  border: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  flex: none;
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--ink); }
.theme-toggle-icon {
  width: 1.05rem; height: 1.05rem; display: block;
  fill: currentColor; stroke: currentColor; stroke-width: 1.7;
  stroke-linecap: round; stroke-linejoin: round;
  pointer-events: none;
}
.theme-toggle-icon.is-sun { fill: none; }
.theme-toggle .theme-icon-sun { display: none; }
html[data-theme="dark"] .theme-toggle .theme-icon-moon { display: none; }
html[data-theme="dark"] .theme-toggle .theme-icon-sun { display: block; }
@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) .theme-toggle .theme-icon-moon { display: none; }
  html:not([data-theme="light"]) .theme-toggle .theme-icon-sun { display: block; }
}
.nav-toggle {
  display: none; width: 40px; height: 40px; padding: 8px;
  border: 0; background: transparent; color: var(--ink); cursor: pointer;
  flex: none; order: 4;
}

/* ============ buttons ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
  border: 1px solid transparent;
  border-radius: 0;
  min-height: 2.5rem;
  padding: 0.55rem 1.15rem;
  font: 600 0.88rem/1.2 var(--font);
  letter-spacing: 0.06em;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.btn, .btn:hover { text-decoration: none; }
.btn.primary {
  background: var(--ink); color: var(--paper);
}
.btn.primary:hover { background: var(--brand-strong); color: var(--paper); transform: translateY(-1px); }
.btn.ghost {
  background: transparent; color: var(--ink); border-color: var(--line);
}
.btn.ghost:hover { border-color: var(--ink); color: var(--ink); }
.btn.line {
  background: transparent; color: var(--ink); border-color: var(--line);
}
.btn.line:hover { border-color: var(--ink); color: var(--ink); }
.btn-row, .hero-cta {
  display: flex; flex-wrap: wrap; gap: 0.7rem;
  margin: 1.1rem 0 0.75rem;
}

/* ============ 首屏 / 页头 ============ */
.hero, .page-hero {
  position: relative;
  color: var(--ink);
  overflow: hidden;
  isolation: isolate;
}
.hero {
  min-height: min(88vh, 820px);
  display: flex;
  align-items: center;
  padding: 3.5rem 0 2.2rem;
}
.hero-stage {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}
.hero-scene, .hero-veil {
  position: absolute;
  display: block;
}
.hero-scene {
  inset: -12%;
  background:
    radial-gradient(circle at 78% 42%, rgba(var(--signal-rgb), 0.13) 0 6%, transparent 32%),
    radial-gradient(circle at 92% 10%, rgba(var(--signal-rgb), 0.07), transparent 25%),
    transparent;
}
.hero-veil {
  inset: 0;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--paper) 88%, transparent) 0%, transparent 72%),
    linear-gradient(180deg, color-mix(in srgb, var(--paper) 70%, transparent), transparent 18%, transparent 82%, var(--paper));
}
.hero-inner {
  position: relative;
  z-index: 1;
}
.hero-grid, .hero-main {
  position: relative; z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(16rem, 22rem);
  gap: clamp(1.75rem, 3.5vw, 3.25rem);
  align-items: center;
}
.page-hero { padding: 3.25rem 0 1.25rem; }
.page-hero .hero-grid { padding: 0; }
.hero-copy { max-width: 36em; position: relative; z-index: 2; }

.eyebrow, .hero-eyebrow {
  display: inline-flex;
  align-items: stretch;
  margin: 0 0 1.35rem;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 0;
  background: none;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.69rem;
  font-weight: 650;
  letter-spacing: 0.12em;
}
.eyebrow { padding: 0.48rem 0.7rem; }
.hero-eyebrow span { padding: 0.48rem 0.7rem; }
.hero-eyebrow-brand {
  background: var(--ink);
  color: var(--paper);
}
.hero-eyebrow-place {
  color: var(--muted);
  background: color-mix(in srgb, var(--paper) 76%, transparent);
}

.hero h1, .hero-title, .page-hero h1 {
  margin: 0 0 0.35rem;
  font-size: clamp(2.35rem, 4.15vw, 3.6rem);
  font-weight: 750;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--ink);
}
.hero-title span, .hero h1 span, .page-hero h1 span {
  display: block;
  color: var(--signal);
}
.page-hero h1 { font-size: clamp(1.85rem, 3.5vw, 2.6rem); letter-spacing: 0.01em; }
.hero-slogan {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.65rem;
  row-gap: 0.35rem;
  margin: 1.2rem 0 0;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: clamp(0.82rem, 1.25vw, 0.95rem);
  font-weight: 650;
  letter-spacing: 0.08em;
}
.hero-slogan i { color: var(--signal); font-style: normal; }
.lead, .hero-desc {
  margin: 1rem 0 0;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--muted);
  max-width: 31rem;
}
.note { margin: 0.85rem 0 0; font-size: 0.77rem; color: var(--muted); }
.hero-offer {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.77rem;
}
.hero-offer span {
  padding: 0.16rem 0.4rem;
  background: rgba(var(--signal-rgb), 0.12);
  color: var(--signal);
  font-family: var(--font-mono);
  font-weight: 700;
}
.hero .hero-cta, .page-hero .btn-row { margin-top: 1.5rem; }
.hero .hero-cta .btn, .hero .btn-row .btn {
  min-height: 3.15rem;
  padding: 0.7rem 1.35rem;
  font-size: 1rem;
  letter-spacing: 0.04em;
}
.hero .hero-cta .btn-cta span,
.hero .hero-cta .btn.primary span {
  margin-left: 0.15rem;
  transition: transform 0.25s ease;
}
.hero .hero-cta .btn.primary:hover span { transform: translate(2px, -2px); }
.hero-art { position: relative; }

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 2rem 0 0;
  padding-top: 1.15rem;
  border-top: 1px solid var(--line);
}
.hero-metric { padding: 0 1.35rem; }
.hero-metric:first-child { padding-left: 0; }
.hero-metric dt {
  margin-bottom: 0.35rem;
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 650;
  letter-spacing: 0.12em;
}
.hero-metric dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
  flex-wrap: wrap;
}
.hero-metric dd b {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 2.4vw, 1.85rem);
  font-weight: 700;
  line-height: 1;
}
.hero-metric dd span { color: var(--muted); font-size: 0.8rem; }

/* Hero 功能示意图：浅底节点，信号绿编号 */
.schema {
  pointer-events: none;
  user-select: none;
  padding: 1.25rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: 0;
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  box-shadow: 0 1.2rem 3rem rgba(16, 20, 24, 0.08);
  backdrop-filter: blur(12px);
}
.schema-kicker {
  margin: 0 0 1rem;
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.schema-path { display: flex; flex-direction: column; }
.schema-node {
  display: grid;
  grid-template-columns: 2.15rem minmax(0, 1fr);
  gap: 0.7rem;
  align-items: center;
  padding: 0.7rem 0.85rem 0.7rem 0.65rem;
  border: 0;
  border-left: 2px solid transparent;
  background: color-mix(in srgb, var(--paper) 55%, transparent);
}
.schema-node strong { display: block; color: var(--ink); font-size: 0.92rem; }
.schema-node em {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-style: normal;
  font-size: 0.72rem;
  line-height: 1.45;
}
.schema-num {
  width: auto; height: auto;
  display: block;
  background: none;
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
}
.schema-join {
  width: 1px; height: 10px;
  margin: 0 0 0 1.05rem;
  background: rgba(var(--signal-rgb), 0.35);
}
.schema-node.is-end {
  border-left-color: var(--signal);
  background: rgba(var(--signal-rgb), 0.08);
}
.schema-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-3);
}
.schema-pane {
  padding: 14px;
  border-radius: 0;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 70%, transparent);
}
.schema-pane.on { border-color: rgba(var(--signal-rgb), 0.45); background: rgba(var(--signal-rgb), 0.08); }
.schema-pane.off { opacity: .62; }
.schema-pane h3 { margin: 0 0 8px; color: var(--ink); font-size: var(--fs-sm); }
.schema-pane ul { margin: 0; padding-left: 1.1em; color: var(--muted); font-size: var(--fs-xs); line-height: 1.7; }
.schema-pane p { margin: 0; color: var(--muted); font-size: var(--fs-xs); line-height: var(--lh-snug); }
.schema-mark {
  display: inline-block;
  margin-top: 8px;
  color: var(--signal);
  font-size: var(--fs-xs);
  font-weight: var(--fw-sb);
}
.schema-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-2);
}
.schema-chip {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px;
  min-height: 72px;
  padding: 10px 6px;
  border: 1px dashed rgba(var(--signal-rgb), 0.38);
  border-radius: 0;
  color: var(--ink);
  font-size: var(--fs-xs);
  text-align: center;
}
.schema-chip svg { width: 18px; height: 18px; color: var(--signal); }
.schema-sink {
  margin-top: var(--sp-4);
  padding: 14px;
  text-align: center;
  border-radius: 0;
  background: rgba(var(--signal-rgb), 0.12);
  color: var(--ink);
  font-size: var(--fs-sm);
  font-weight: var(--fw-sb);
}
.schema-funnel { display: grid; gap: 8px; }
.schema-funnel i {
  display: flex; align-items: center; justify-content: center;
  height: 36px; margin-inline: auto;
  border-radius: 0;
  background: var(--ink);
  color: var(--paper);
  font-size: var(--fs-xs);
  font-style: normal;
  font-weight: var(--fw-sb);
}

/* ============ 页内真实截图 ============ */
.shot {
  margin: 0;
  border-radius: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-md);
}
.shot img { width: 100%; height: auto; display: block; }
.shot--flat { box-shadow: none; }
.shot--portrait { max-width: 380px; margin-left: auto; }
.shot--phone {
  max-width: 280px;
  margin: 0 auto;
  border: 9px solid var(--ink);
  border-radius: 30px;
  box-shadow: var(--shadow-xl);
}

/* ============ 功能示意图（产品 UI 仍保留圆角，贴近真实挂件） ============ */
.ui {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  overflow: hidden;
  color: var(--ink);
}
.ui--flat { box-shadow: none; }
.ui-bar {
  display: flex; align-items: center; gap: var(--sp-3);
  padding: 10px var(--sp-4);
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}
.ui-dots { display: flex; gap: 5px; flex: none; }
.ui-dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--soft); }
.ui-tab {
  flex: 1; min-width: 0;
  padding: 3px 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-size: var(--fs-xs);
  color: var(--muted);
  text-align: center;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.ui-body { padding: var(--sp-4); }
.ui-foot {
  display: flex; align-items: center; gap: var(--sp-2);
  padding: 10px var(--sp-4);
  border-top: 1px solid var(--line);
  background: var(--bg);
  font-size: var(--fs-xs); color: var(--soft);
}
.ui-foot .fake-input {
  flex: 1; padding: 7px 12px; background: var(--panel);
  border: 1px solid var(--line); border-radius: var(--r-pill);
}
.ui-send {
  width: 28px; height: 28px; flex: none;
  display: grid; place-items: center;
  border-radius: 50%; background: var(--ink); color: var(--paper);
}

.chat { display: flex; flex-direction: column; gap: var(--sp-3); }
.bubble {
  max-width: 86%;
  padding: 10px 14px;
  border-radius: 12px;
  font-size: var(--fs-base);
  line-height: var(--lh-snug);
}
.bubble.ask { align-self: flex-end; background: var(--ink); color: var(--paper); border-bottom-right-radius: 4px; }
.bubble.ans { align-self: flex-start; background: var(--bg); color: var(--ink-2); border-bottom-left-radius: 4px; }
.bubble.sys {
  align-self: center; max-width: 100%;
  background: var(--brand-soft); color: var(--signal);
  font-size: var(--fs-xs); border-radius: var(--r-pill); padding: 4px 12px;
}
.bubble p { margin: 0; }
.bubble p + p { margin-top: var(--sp-2); }
.cite {
  display: inline-flex; align-items: center; gap: 5px;
  margin-top: var(--sp-2);
  padding: 2px 8px;
  background: var(--panel);
  border: 1px solid var(--brand-line);
  border-radius: var(--r-pill);
  font-size: var(--fs-xs);
  color: var(--signal);
}
.typing { display: inline-flex; gap: 4px; align-items: center; }
.typing i { width: 5px; height: 5px; border-radius: 50%; background: var(--soft); animation: blink 1.2s infinite; }
.typing i:nth-child(2) { animation-delay: .2s; }
.typing i:nth-child(3) { animation-delay: .4s; }
@keyframes blink { 0%, 60%, 100% { opacity: .25; } 30% { opacity: 1; } }

.rows { display: grid; gap: var(--sp-2); }
.row {
  display: flex; align-items: center; gap: var(--sp-3);
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 0;
  font-size: var(--fs-sm);
  background: var(--panel);
}
.row .grow { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.row .ico { flex: none; width: 18px; height: 18px; color: var(--signal); }
.row .meta { flex: none; color: var(--soft); font-size: var(--fs-xs); }
.tag {
  flex: none; padding: 2px 9px; border-radius: 0;
  font-size: var(--fs-xs); font-weight: var(--fw-md);
  background: var(--bg); color: var(--muted);
}
.tag.ok { background: var(--brand-soft); color: var(--signal); }
.tag.warn { background: #fef3c7; color: #92400e; }
.tag.info { background: #e0f2fe; color: #075985; }

.ui-cols { display: grid; grid-template-columns: 38% 1fr; }
.ui-cols > * { padding: var(--sp-4); min-width: 0; }
.ui-cols > * + * { border-left: 1px solid var(--line); }
.col-title {
  margin: 0 0 var(--sp-3); font-size: var(--fs-xs); font-weight: var(--fw-bd);
  letter-spacing: .1em; color: var(--soft);
}
.col-title--gap { margin-top: var(--sp-5); }

.kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-3); margin-bottom: var(--sp-4); }
.kpi { padding: 10px 12px; background: var(--bg); border-radius: 0; }
.kpi b { display: block; font-size: var(--fs-xl); line-height: 1.2; }
.kpi span { font-size: var(--fs-xs); color: var(--muted); }
.bars { display: flex; align-items: flex-end; gap: 6px; height: 108px; }
.bars i {
  flex: 1; border-radius: 0;
  background: var(--signal);
  min-height: 6px;
}
.funnel { display: grid; gap: var(--sp-2); }
.funnel div {
  height: 26px; border-radius: 0;
  background: var(--ink);
  display: flex; align-items: center; padding: 0 10px;
  color: var(--paper); font-size: var(--fs-xs); font-weight: var(--fw-md);
}

.code {
  margin: 0;
  padding: var(--sp-5);
  background: #101418;
  color: #cbd5e1;
  font: var(--fs-sm)/1.85 var(--font-mono);
  overflow-x: auto;
  white-space: pre;
  tab-size: 2;
}
.code .t { color: #3ee6a6; }
.code .a { color: #93c5fd; }
.code .s { color: #fda4af; }
.code .c { color: #64748b; }

.phone {
  width: 232px; margin: 0 auto;
  border: 9px solid var(--ink);
  border-radius: 30px;
  background: var(--panel);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
}
.phone-bar {
  display: flex; align-items: center; justify-content: center;
  padding: 6px; background: var(--ink); color: var(--paper);
  font-size: var(--fs-xs); font-weight: var(--fw-sb);
}
.phone .ui-body { padding: var(--sp-3); }

.channels { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-2); }
.channels div {
  display: flex; flex-direction: column; gap: 4px; align-items: center;
  padding: var(--sp-3) var(--sp-2);
  border: 1px solid var(--line); border-radius: 0;
  font-size: var(--fs-xs); color: var(--muted); text-align: center;
}
.channels svg { width: 20px; height: 20px; color: var(--signal); }

.launcher {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  padding: 10px 16px; border-radius: var(--r-pill);
  background: var(--ink); color: var(--paper);
  font-size: var(--fs-sm); font-weight: var(--fw-sb);
  box-shadow: var(--shadow-lg);
}
.launcher svg { width: 18px; height: 18px; }
.launcher-row { display: flex; flex-wrap: wrap; gap: var(--sp-3); align-items: center; }

/* ============ 模块卡：OPC 式分格，无圆角无阴影 ============ */
.mods {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: var(--panel);
}
.mod {
  display: flex; flex-direction: column;
  padding: 1.5rem 1.25rem;
  background: transparent;
  border: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  color: inherit;
  transition: background 0.2s ease, padding-left 0.25s ease;
}
.mod:hover {
  text-decoration: none;
  color: inherit;
  background: var(--bg);
  padding-left: 1.5rem;
}
.mod-ico {
  width: 36px; height: 36px; margin-bottom: 0.85rem;
  display: grid; place-items: center;
  background: transparent;
  color: var(--signal);
  border: 1px solid rgba(var(--signal-rgb), 0.35);
  border-radius: 0;
}
.mod-ico svg { width: 18px; height: 18px; }
.mod-no {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--signal);
}
.mod h3 { margin: 0.2rem 0 0.55rem; font-size: 1.12rem; }
.mod p { margin: 0 0 1.1rem; color: var(--muted); font-size: 0.92rem; line-height: 1.65; }
.mod code {
  padding: 1px 5px;
  background: var(--bg);
  font-family: var(--font-mono);
  font-size: .9em;
}
.mod .more { margin-top: auto; color: var(--ink); font-size: 0.86rem; font-weight: 600; }
.mod:hover .more { color: var(--signal); text-decoration: none; }

/* ============ 三件事（首页主卖点） ============ */
.offers {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: var(--panel);
}
.offer {
  display: flex;
  flex-direction: column;
  padding: 1.75rem 1.4rem 1.5rem;
  background: transparent;
  border: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  color: inherit;
  transition: background 0.2s ease, padding-left 0.25s ease;
}
.offer:hover {
  text-decoration: none;
  color: inherit;
  background: var(--bg);
  padding-left: 1.65rem;
}
.offer-ico {
  width: 40px; height: 40px; margin-bottom: 0.95rem;
  display: grid; place-items: center;
  background: transparent;
  color: var(--signal);
  border: 1px solid rgba(var(--signal-rgb), 0.35);
}
.offer-ico svg { width: 20px; height: 20px; }
.offer-no {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--signal);
}
.offer h3 { margin: 0.35rem 0 0.7rem; font-size: 1.28rem; }
.offer p { margin: 0 0 1.2rem; color: var(--muted); font-size: 0.95rem; line-height: 1.7; }
.offer .more { margin-top: auto; color: var(--ink); font-size: 0.86rem; font-weight: 600; }
.offer:hover .more { color: var(--signal); text-decoration: none; }

/* ============ 图文分栏 ============ */
.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--sp-16);
  align-items: center;
}
.split + .split { margin-top: var(--sp-20); }
.split.reverse .art { order: -1; }
.copy h2 { margin: 0 0 var(--sp-4); font-size: clamp(1.5rem, 2.6vw, 2rem); }
.copy p { color: var(--ink-2); }
.copy ul { margin: var(--sp-4) 0 0; padding-left: 20px; color: var(--ink-2); }
.copy li { margin: var(--sp-2) 0; }

.facts { display: grid; grid-template-columns: 1fr 1fr; gap: 0; margin-top: var(--sp-6); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.fact { padding: 1.15rem 1.1rem; background: var(--panel); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); border-radius: 0; }
.fact strong { display: block; margin-bottom: var(--sp-1); font-size: var(--fs-base); }
.fact span { color: var(--muted); font-size: var(--fs-sm); line-height: var(--lh-snug); display: block; }

/* ============ 流程 ============ */
.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; }
.step { position: relative; padding-top: 1rem; border-top: 2px solid var(--signal); }
.step::before, .step-dot { display: none; }
.step-no {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--signal);
  margin-bottom: 0.45rem;
}
.step h3 { margin: 0 0 0.4rem; font-size: 1.12rem; }
.step p { margin: 0; color: var(--muted); font-size: 0.92rem; line-height: 1.65; }

/* ============ 相关页 ============ */
.related { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.rel {
  display: flex; align-items: center; justify-content: space-between; gap: var(--sp-3);
  padding: 1.15rem 1.25rem;
  background: var(--panel);
  border: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  color: var(--ink);
  font-weight: var(--fw-sb);
  transition: background 0.2s ease, color 0.2s ease;
}
.rel:hover { text-decoration: none; background: var(--bg); color: var(--signal); }
.rel svg { width: 18px; height: 18px; flex: none; }

/* ============ 底部 CTA ============ */
.cta {
  position: relative;
  padding: 2.4rem 1.6rem;
  border-radius: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  overflow: hidden;
}
.cta::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--signal), transparent);
}
.cta h2 { margin: 0 0 var(--sp-4); font-size: clamp(1.5rem, 3vw, 2.1rem); color: var(--ink); max-width: 16em; }
.cta .lead { max-width: 40em; color: var(--muted); }
.cta .eyebrow { margin-bottom: 0.85rem; }

/* ============ footer ============ */
.foot {
  position: relative;
  flex-shrink: 0;
  margin-top: 1rem;
  background:
    radial-gradient(720px 280px at 12% 0%, color-mix(in srgb, var(--soft) 42%, transparent), transparent 70%),
    linear-gradient(180deg, color-mix(in srgb, var(--paper-2) 70%, var(--paper)) 0%, var(--paper-2) 100%);
  color: var(--muted);
  padding: 0 0 env(safe-area-inset-bottom, 0px);
  font-size: 0.92rem;
  overflow: hidden;
  border-top: 1px solid var(--line);
}
.foot::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--signal), transparent);
  opacity: .9;
}
.foot a { color: var(--muted); }
.foot a:hover { color: var(--ink); text-decoration: none; border-bottom: 1px solid color-mix(in srgb, var(--signal) 70%, transparent); }
.foot-grid {
  display: grid;
  grid-template-columns: minmax(14em, 1.35fr) repeat(4, minmax(7em, 1fr));
  gap: 2rem 2.5rem;
  padding: 3.25rem 0 1.75rem;
}
.foot-logo {
  display: inline-flex; align-items: center; gap: var(--sp-3);
  margin: 0 0 0.85rem;
  color: var(--ink); font-weight: var(--fw-bd); font-size: 1.05rem;
}
.foot-logo:hover { text-decoration: none; color: var(--ink); border-bottom: 0; }
.foot-logo img { width: 32px; height: 32px; border-radius: 2px; }
.foot-brand p { margin: 0; max-width: 28em; line-height: 1.7; }
.foot-col { display: flex; flex-direction: column; align-items: flex-start; gap: 0.45rem; }
.foot-col h2 {
  display: block;
  margin: 0 0 0.35rem;
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}
.foot-col a { padding: 0; font-size: 0.92rem; }
.foot-qr {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  margin-top: 1.15rem;
}
.foot-qr-item {
  margin: 0;
  width: 6.5rem;
  text-align: center;
}
.foot-qr-item img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  object-fit: contain;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 0.4rem;
  box-sizing: border-box;
}
.foot-qr-item figcaption {
  margin: 0.4rem 0 0;
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 600;
}
.foot-bar {
  display: flex; justify-content: space-between; align-items: center;
  gap: var(--sp-4); flex-wrap: wrap;
  padding: 1.35rem 0 0.75rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.82rem;
}
.foot-bar p { margin: 0; }
.foot-bar a { color: var(--signal); }
.foot-bar a:hover { color: var(--ink); }
.foot-credit {
  margin: 0;
  padding: 0 0 1.5rem;
  font-size: 0.82rem;
  color: var(--muted);
}
.foot-credit a { color: var(--signal); }
.foot-credit a:hover { color: var(--ink); }

/* ============ 正文页（license 等） ============ */
.prose { max-width: var(--wrap-narrow); margin: 0 auto; padding: 3.5rem 1rem 4rem; }
.prose h1 { font-size: clamp(1.85rem, 3.5vw, 2.6rem); margin: 0 0 0.65rem; letter-spacing: 0.01em; }
.prose h2 { font-size: 1.25rem; margin: var(--sp-10) 0 var(--sp-3); }
.prose p, .prose li { color: var(--ink-2); }
.prose ul { padding-left: 1.2em; }
.prose code {
  padding: 1px 6px;
  background: var(--bg);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: .92em;
}
.prose pre {
  padding: var(--sp-5); background: var(--bg); border: 1px solid var(--line);
  border-radius: 0; overflow-x: auto;
  font: var(--fs-sm)/1.8 var(--font-mono); white-space: pre-wrap;
}

/* ============ 右侧挂载栏 ============ */
.aics-quick-dock {
  position: fixed;
  right: 0;
  top: 50%;
  z-index: 39;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 8px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-right: 0;
  border-radius: 10px 0 0 10px;
  box-shadow: -4px 0 20px rgba(16, 20, 24, 0.1);
}
html[data-theme="dark"] .aics-quick-dock {
  box-shadow: -4px 0 20px rgba(0, 0, 0, 0.35);
}
.aics-quick-dock > a,
.aics-quick-dock > button,
.aics-quick-dock .ai-kefu-rail-hotline-wrap > button {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  width: 52px;
  min-height: 52px;
  padding: 6px 4px;
  border: 0;
  background: transparent;
  color: var(--signal);
  font-size: 10px;
  font-weight: 600;
  line-height: 1.15;
  text-decoration: none;
  border-radius: 8px;
  cursor: pointer;
  font-family: inherit;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.aics-quick-dock > a:hover,
.aics-quick-dock > button:hover,
.aics-quick-dock .ai-kefu-rail-hotline-wrap > button:hover {
  background: var(--brand-soft);
  color: var(--signal);
}
.aics-quick-dock > a:focus-visible,
.aics-quick-dock > button:focus-visible,
.aics-quick-dock .ai-kefu-rail-hotline-wrap > button:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}
.aics-quick-dock .aics-dock-icon {
  width: 20px;
  height: 20px;
  display: block;
}
.aics-quick-dock .aics-dock-ai { color: var(--signal); }
.aics-quick-dock .aics-dock-pack {
  min-height: 60px;
}
.aics-quick-dock .aics-dock-pack span {
  white-space: normal;
  text-align: center;
  line-height: 1.2;
}
.aics-quick-dock .aics-dock-item.is-on {
  background: var(--brand-soft);
}

@media (max-width: 899px) {
  .aics-quick-dock {
    top: auto;
    bottom: max(16px, env(safe-area-inset-bottom, 0px));
    transform: none;
    padding: 8px 6px;
  }
  .aics-quick-dock > a,
  .aics-quick-dock > button,
  .aics-quick-dock .ai-kefu-rail-hotline-wrap > button {
    width: 46px;
    min-height: 46px;
    font-size: 9px;
  }
  .aics-quick-dock .aics-dock-pack { min-height: 52px; }
  body.ai-kefu-open .aics-quick-dock {
    visibility: hidden;
    pointer-events: none;
  }
}

/* ============ 支持的三方平台 ============ */
.plat-wall { margin-top: 0.25rem; }
.plat-wall-group { margin: 0 0 2.25rem; }
.plat-wall-group:last-child { margin-bottom: 0; }
.plat-wall-group h2 {
  margin: 0 0 0.85rem;
  font-size: 1.08rem;
}
.plat-wall-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: var(--panel);
}
.plat-tile {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1.15rem 1.05rem 1.1rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  min-height: 9rem;
}
.plat-logo {
  box-sizing: border-box;
  width: 48px;
  height: 48px;
  padding: 8px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  background: #fff;
  border: 1px solid var(--line);
}
.plat-logo img {
  width: 32px;
  height: 32px;
  display: block;
  object-fit: contain;
}
.plat-logo--fallback {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--signal);
}
html[data-theme="dark"] .plat-logo,
[data-theme="dark"] .plat-logo {
  background: #fff;
  border-color: rgba(16, 20, 24, 0.12);
}
.plat-tile strong { font-size: 0.98rem; line-height: 1.35; }
.plat-tile em {
  font-style: normal;
  font-size: 0.72rem;
  color: var(--soft);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}
.plat-tile p {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.55;
}
.plat-home {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: var(--panel);
}
.plat-home a {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  gap: 0.3rem;
  padding: 1rem 0.9rem 0.95rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: inherit;
  text-decoration: none;
  min-height: 7.2rem;
}
.plat-home a:hover {
  background: var(--bg);
  text-decoration: none;
  color: inherit;
}
.plat-home b { font-size: 0.9rem; font-weight: 650; }
.plat-home span { font-size: 0.72rem; color: var(--muted); }
.plat-home a.is-more b { color: var(--signal); }

/* ============ 响应式 ============ */
@media (max-width: 1080px) {
  .nav-toggle { display: grid; place-items: center; }
  .brand { margin-right: 0; }
  .nav-links {
    display: none;
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch;
    padding: 0.5rem 1rem 1rem;
    background: var(--header);
    border-bottom: 1px solid var(--line);
    gap: 0;
    margin: 0;
  }
  .nav-links.is-open { display: flex; }
  .nav-item { flex-direction: column; align-items: stretch; }
  .nav-parent { align-self: flex-start; }
  .nav-caret { display: none; }
  .nav-drop,
  .nav-item:hover .nav-drop,
  .nav-item:focus-within .nav-drop {
    display: flex;
    position: static;
    left: auto;
    transform: none;
    min-width: 0;
    padding: 0 0 0.35rem 0.85rem;
    border: 0;
    background: transparent;
    text-align: left;
  }
  .nav-drop::before { display: none; }
  .nav-links > a,
  .nav-parent,
  .nav-drop a { padding: 11px 4px; font-size: var(--fs-md); }
  .nav-drop a { font-size: 0.92rem; }
  .nav-drop a:hover { background: transparent; }
  .nav-drop a.is-on { background: transparent; }
  .nav-links > a.is-on::after,
  .nav-parent.is-on::after { bottom: 6px; left: 4px; right: auto; width: 1.2rem; }
  .hero { min-height: 0; padding: 3rem 0 2rem; }
  .hero-grid, .hero-main { grid-template-columns: 1fr; gap: 2rem; }
  .hero-copy { max-width: none; }
  .hero-art { max-width: 560px; width: 100%; margin-inline: auto; }
  .shot--portrait { max-width: min(380px, 100%); margin: 0 auto; }
  .mods { grid-template-columns: 1fr 1fr; }
  .plat-wall-grid { grid-template-columns: repeat(2, 1fr); }
  .plat-home { grid-template-columns: repeat(3, 1fr); }
  .split { gap: var(--sp-10); }
  .flow { grid-template-columns: 1fr 1fr; row-gap: 1.5rem; }
  .hero-metrics { grid-template-columns: 1fr 1fr; gap: 1.1rem 0; }
  .hero-metric { padding: 0 1rem 0 0; }
  .hero-metric:nth-child(odd) { padding-left: 0; }
}

@media (max-width: 860px) {
  .nav-cta { padding: 0.45rem 0.85rem; font-size: 0.82rem; min-height: 2.2rem; }
  .foot-grid { grid-template-columns: 1fr 1fr; gap: var(--sp-8); padding: 2.4rem 0 1.2rem; }
  .foot-brand { grid-column: 1 / -1; }
  .section { padding: 3rem 0; }
  .mods, .offers, .related, .facts { grid-template-columns: 1fr; }
  .plat-wall-grid, .plat-home { grid-template-columns: 1fr 1fr; }
  .split, .split.reverse { grid-template-columns: 1fr; gap: var(--sp-8); }
  .split.reverse .art { order: 0; }
  .split + .split { margin-top: var(--sp-12); }
  .flow { grid-template-columns: 1fr; row-gap: 1.25rem; }
  .cta { padding: 1.75rem 1.15rem; }
  .ui-cols { grid-template-columns: 1fr; }
  .ui-cols > * + * { border-left: 0; border-top: 1px solid var(--line); }
  .kpis, .channels { grid-template-columns: 1fr 1fr; }
  .schema-split, .schema-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 520px) {
  .hero { padding: 2.2rem 0 1.5rem; }
  .hero-metrics { grid-template-columns: 1fr 1fr; }
  .btn-row .btn, .hero-cta .btn { flex: 1 1 auto; }
}