/* ============================================================
   知数 agenticdata · 产品官网
   编辑部风格：暖白纸面 / 细线 / 宋体大标题 / 紫色点睛
   ============================================================ */

:root {
  /* 色板 —— 全部向品牌紫微调，不用纯黑纯白 */
  --paper: oklch(0.987 0.005 95);          /* 暖白纸面（沿用应用 #fffefa 系） */
  --paper-deep: oklch(0.962 0.012 300);    /* 紫调浅面板 */
  --panel: oklch(0.945 0.03 300);          /* 紫色淡染块 */
  --ink: oklch(0.235 0.02 300);            /* 紫调墨色 */
  --ink-2: oklch(0.42 0.022 300);
  --ink-3: oklch(0.585 0.018 300);
  --violet: oklch(0.54 0.215 293);         /* 品牌紫 ≈ #7c3aed */
  --violet-deep: oklch(0.46 0.2 293);
  --violet-bright: oklch(0.68 0.17 293);   /* 深色底上的紫（按钮/标记） */
  --hairline: color-mix(in oklab, var(--ink) 15%, transparent);
  --hairline-strong: color-mix(in oklab, var(--ink) 28%, transparent);
  --paper-inverse: oklch(0.985 0.006 95);
  --ink-inverse: oklch(0.955 0.01 95);

  /* 字体 */
  --serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --serif-latin: "Fraunces", "Noto Serif SC", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* 节奏 */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --wrap: 72rem;
  --gutter: clamp(1.25rem, 5vw, 4rem);
}

/* ---------- 基础 ---------- */

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.8;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: color-mix(in oklab, var(--violet) 22%, var(--paper));
}

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: 0.015em;
  text-wrap: balance;
  margin: 0;
}

p { margin: 0; }

a { color: inherit; }

.wrap {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  background: var(--ink);
  color: var(--ink-inverse);
  padding: 0.6em 1.2em;
  border-radius: 6px;
  text-decoration: none;
  transition: top 0.2s var(--ease);
}
.skip:focus-visible { top: 1rem; }

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--sans);
  font-size: 0.975rem;
  font-weight: 500;
  line-height: 1;
  padding: 0.95em 1.5em;
  border-radius: 8px;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.25s var(--ease), color 0.25s var(--ease),
    border-color 0.25s var(--ease), translate 0.25s var(--ease);
}
.btn:active { translate: 0 1px; }

.btn-primary::after {
  content: "↓";
  font-size: 0.88em;
  transition: translate 0.3s var(--ease);
}
.btn-primary:hover::after { translate: 0 2px; }

.btn-ghost::after {
  content: "→";
  font-size: 0.88em;
  transition: translate 0.3s var(--ease);
}
.btn-ghost:hover::after { translate: 3px 0; }

.btn-primary {
  background: var(--violet);
  color: var(--ink-inverse);
}
.btn-primary:hover {
  background: var(--violet-deep);
  translate: 0 -1px;
}

.btn-ghost {
  border-color: var(--hairline-strong);
  color: var(--ink);
}
.btn-ghost:hover {
  background: var(--paper-deep);
  border-color: color-mix(in oklab, var(--ink) 45%, transparent);
}

.btn-sm { padding: 0.7em 1.1em; font-size: 0.9rem; }

.btn-inverse {
  background: transparent;
  color: var(--ink-inverse);
  border-color: color-mix(in oklab, var(--ink-inverse) 35%, transparent);
}
.btn-inverse:hover {
  background: color-mix(in oklab, var(--ink-inverse) 10%, transparent);
  border-color: color-mix(in oklab, var(--ink-inverse) 60%, transparent);
  translate: 0 -1px;
}

/* ---------- 滚动进度条 ---------- */

.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--violet);
  transform: scaleX(0);
  transform-origin: 0 50%;
  z-index: 60;
  pointer-events: none;
}

/* ---------- 顶部导航 ---------- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--paper);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease);
}
.site-nav.is-scrolled { border-bottom-color: var(--hairline); }

.nav-inner {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  height: 4.25rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
}
.wordmark-logo {
  display: block;
  width: 2.35rem;
  height: 2.35rem;
  flex: 0 0 auto;
  object-fit: contain;
}
.wordmark-stack {
  display: grid;
  gap: 0.08rem;
  line-height: 1;
}
.wordmark-cn {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.3rem;
  line-height: 1;
  letter-spacing: 0.08em;
}
.wordmark-latin {
  font-family: var(--mono);
  font-size: 0.72rem;
  line-height: 1;
  letter-spacing: 0.14em;
  text-transform: lowercase;
  color: var(--ink-3);
}

.nav-links {
  display: flex;
  gap: 1.9rem;
  margin-left: auto;
}
.nav-links a {
  position: relative;
  font-size: 0.92rem;
  color: var(--ink-2);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 100%;
  height: 1px;
  background: var(--violet);
  scale: 0 1;
  transform-origin: left center;
  transition: scale 0.35s var(--ease);
}
.nav-links a:hover { color: var(--violet-deep); }
.nav-links a:hover::after { scale: 1 1; }

.nav-inner > .btn { margin-left: 0.5rem; }

.nav-toggle {
  display: none;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  flex: 0 0 auto;
  padding: 0;
  border: 1px solid var(--hairline-strong);
  border-radius: 50%;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}
.nav-toggle-icon {
  position: relative;
  display: block;
  width: 1rem;
  height: 0.75rem;
}
.nav-toggle-icon span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transition: top 0.22s var(--ease), rotate 0.22s var(--ease);
}
.nav-toggle-icon span:first-child { top: 0.2rem; }
.nav-toggle-icon span:last-child { top: 0.55rem; }
.site-nav.is-menu-open .nav-toggle-icon span:first-child { top: 0.38rem; rotate: 45deg; }
.site-nav.is-menu-open .nav-toggle-icon span:last-child { top: 0.38rem; rotate: -45deg; }

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

.hero {
  padding-block: clamp(4rem, 11vh, 8rem) clamp(5rem, 12vh, 9rem);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(1.5rem, 3vw, 3rem);
  align-items: center;
}

.hero-copy { grid-column: 1 / 7; }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 1.6rem;
}
.eyebrow::before {
  content: "";
  display: inline-block;
  width: 1.6rem;
  height: 1px;
  background: var(--violet);
  vertical-align: middle;
  margin-right: 0.8rem;
}

.hero h1 {
  font-size: clamp(2.5rem, 5.2vw, 4.1rem);
  font-weight: 700;
  line-height: 1.22;
  margin-bottom: 1.6rem;
}

/* 标题逐行揭示（遮罩上移） */
.ml { display: block; overflow: hidden; }
.ml-in {
  display: inline-block;
  translate: 0 112%;
  transition: translate 0.95s var(--ease);
}
[data-reveal].reveal-fade { translate: 0 0; }
[data-reveal].is-in .ml:nth-child(1) .ml-in { transition-delay: 0.12s; }
[data-reveal].is-in .ml:nth-child(2) .ml-in { transition-delay: 0.26s; }
[data-reveal].is-in .ml-in { translate: 0 0; }

.hero-sub {
  font-size: clamp(1.02rem, 1.4vw, 1.15rem);
  color: var(--ink-2);
  max-width: 34em;
  margin-bottom: 2.4rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-bottom: 1.8rem;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.4rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--ink-3);
}
.hero-meta span::before { content: "·"; margin-right: 1.4rem; color: var(--hairline-strong); }
.hero-meta span:first-child::before { content: none; margin-right: 0; }

/* ---------- Hero 界面示意（纯 CSS 绘制） ---------- */

.hero-visual {
  grid-column: 7 / 13;
  margin: 0;
  opacity: 0;
  animation: hero-visual-in 1.05s var(--ease) 0.35s both;
}

@keyframes hero-visual-in {
  from { opacity: 0; translate: 0 32px; scale: 0.98; }
  to { opacity: 1; translate: 0 0; scale: 1; }
}

.hero-parallax { position: relative; }

.visual-block {
  position: absolute;
  inset: 2.2rem -1.4rem -1.8rem 2.2rem;
  background: var(--panel);
  border-radius: 12px;
}

.window {
  position: relative;
  background: oklch(0.995 0.003 95);
  border: 1px solid var(--hairline);
  border-radius: 10px;
  box-shadow: 0 30px 70px -34px color-mix(in oklab, var(--ink) 45%, transparent);
  overflow: hidden;
  animation: window-float 7s ease-in-out 1.6s infinite alternate;
}

@keyframes window-float {
  from { translate: 0 0; }
  to { translate: 0 -8px; }
}

.window-bar {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  height: 2.4rem;
  padding-inline: 0.9rem;
  border-bottom: 1px solid var(--hairline);
  background: var(--paper-deep);
}
.dot { width: 0.62rem; height: 0.62rem; border-radius: 50%; opacity: 0.85; }
.dot-r { background: oklch(0.66 0.19 25); }
.dot-y { background: oklch(0.8 0.15 85); }
.dot-g { background: oklch(0.72 0.15 145); }
.window-title {
  margin-left: 0.7rem;
  font-size: 0.72rem;
  color: var(--ink-3);
  letter-spacing: 0.05em;
}

.window-body {
  display: grid;
  grid-template-columns: 27% 1fr;
  min-height: 20.5rem;
}

.win-side {
  border-right: 1px solid var(--hairline);
  padding: 1.1rem 0.9rem;
}
.win-side-head {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 0.8rem;
}
.win-side-list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.82rem;
  color: var(--ink-2);
  display: grid;
  gap: 0.15rem;
}
.win-side-list li { padding: 0.42em 0.6em; border-radius: 5px; }
.win-side-list li.is-active {
  background: color-mix(in oklab, var(--violet) 10%, transparent);
  color: var(--violet-deep);
  font-weight: 500;
}

.win-main {
  padding: 1.2rem 1.3rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.msg-user {
  align-self: flex-end;
  max-width: 88%;
  background: var(--paper-deep);
  border: 1px solid var(--hairline);
  border-radius: 9px 9px 3px 9px;
  padding: 0.62em 0.95em;
  font-size: 0.85rem;
  line-height: 1.6;
}
.msg-mention {
  display: inline-block;
  margin-left: 0.5em;
  padding-inline: 0.45em;
  border-radius: 4px;
  background: color-mix(in oklab, var(--violet) 12%, transparent);
  color: var(--violet-deep);
  font-size: 0.78rem;
}

.msg-agent {
  border: 1px solid var(--hairline);
  border-radius: 9px 9px 9px 3px;
  padding: 1rem 1.05rem 0.9rem;
  display: grid;
  gap: 0.8rem;
}

.win-chart {
  display: flex;
  align-items: flex-end;
  gap: 0.55rem;
  height: 4.6rem;
  padding-bottom: 1px;
  border-bottom: 1px solid var(--hairline-strong);
}
.win-chart .bar {
  width: 13%;
  height: var(--h);
  background: color-mix(in oklab, var(--ink) 26%, var(--paper));
  border-radius: 2px 2px 0 0;
  transform-origin: 50% 100%;
  transition: transform 0.7s var(--ease);
}
.win-chart .bar-hot { background: var(--violet); }

/* —— 演示循环状态（JS 挂 .demo 后接管，未挂时保持静态成品） —— */
.win-main.demo .msg-user,
.win-main.demo .msg-agent,
.win-main.demo .win-status {
  opacity: 0;
  translate: 0 8px;
  transition: opacity 0.5s var(--ease), translate 0.5s var(--ease);
}
.win-main.demo .msg-user.show,
.win-main.demo .msg-agent.show,
.win-main.demo .win-status.show {
  opacity: 1;
  translate: 0 0;
}

.win-main.demo .win-chart .bar { transform: scaleY(0); }
.win-main.demo .win-chart.show .bar { transform: scaleY(1); }
.win-main.demo .win-chart.show .bar:nth-child(2) { transition-delay: 0.08s; }
.win-main.demo .win-chart.show .bar:nth-child(3) { transition-delay: 0.16s; }
.win-main.demo .win-chart.show .bar:nth-child(4) { transition-delay: 0.24s; }
.win-main.demo .win-chart.show .bar:nth-child(5) { transition-delay: 0.32s; }
.win-main.demo .win-chart.show .bar:nth-child(6) { transition-delay: 0.4s; }

.win-main.demo .win-sql {
  opacity: 0;
  transition: opacity 0.6s var(--ease) 0.15s;
}
.win-main.demo .msg-agent.show .win-sql { opacity: 1; }

.win-main.demo .win-evidence .chip {
  opacity: 0;
  translate: 0 6px;
  transition: opacity 0.45s var(--ease), translate 0.45s var(--ease);
}
.win-main.demo .win-evidence.show .chip { opacity: 1; translate: 0 0; }
.win-main.demo .win-evidence.show .chip:nth-child(2) { transition-delay: 0.12s; }
.win-main.demo .win-evidence.show .chip:nth-child(3) { transition-delay: 0.24s; }

/* 循环收尾：整段快速淡出 */
.win-main.demo.fade .msg-user,
.win-main.demo.fade .msg-agent,
.win-main.demo.fade .win-status {
  opacity: 0;
  translate: 0 -6px;
  transition: opacity 0.45s var(--ease), translate 0.45s var(--ease);
}

.win-sql {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.01em;
  color: var(--ink-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.win-evidence { display: flex; flex-wrap: wrap; gap: 0.45rem; }

.chip {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.04em;
  color: var(--ink-2);
  border: 1px solid var(--hairline);
  border-radius: 99px;
  padding: 0.3em 0.8em;
  white-space: nowrap;
}

@keyframes chip-in {
  from { opacity: 0; translate: 0 8px; scale: 0.94; }
}
.chip-ok {
  border-color: color-mix(in oklab, var(--violet) 45%, transparent);
  color: var(--violet-deep);
  background: color-mix(in oklab, var(--violet) 7%, transparent);
}
.chip-ok::before { content: "✓ "; }

.win-status {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--ink-3);
}
.win-status::before {
  content: "";
  display: inline-block;
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
  background: var(--violet);
  margin-right: 0.55rem;
  vertical-align: 1px;
  animation: dot-pulse 2.2s ease-in-out 0.6s infinite;
}

@keyframes dot-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.win-composer {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  border: 1px solid var(--hairline);
  border-radius: 7px;
  padding: 0.55em 0.85em;
  background: var(--paper);
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-3);
  animation: chip-in 0.55s var(--ease) 1.25s both;
}

.win-caret {
  margin-left: auto;
  width: 4px;
  height: 1em;
  background: var(--violet);
  animation: caret-blink 1.05s steps(1) infinite;
}

@keyframes caret-blink {
  50% { opacity: 0; }
}

/* ---------- 接入生态跑马灯 ---------- */

.tick {
  border-block: 1px solid var(--hairline);
  overflow: hidden;
  padding-block: 0.85rem;
}

.tick-track {
  display: flex;
  width: max-content;
  animation: tick-scroll 36s linear infinite;
}
.tick:hover .tick-track { animation-play-state: paused; }

.tick-group {
  display: flex;
  align-items: center;
  gap: 2.2rem;
  padding-right: 2.2rem;
}

.tick-item {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--ink-2);
  white-space: nowrap;
}
.tick-lead { color: var(--violet-deep); font-weight: 500; }
.tick-sep { color: var(--violet); font-size: 0.7rem; }

@keyframes tick-scroll {
  to { translate: -50% 0; }
}

/* ---------- 章节骨架 ---------- */

.section { padding-block: clamp(4.5rem, 10vh, 7.5rem); }

.sec-head {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 1.6rem;
  padding-bottom: 1.6rem;
  margin-bottom: 0.5rem;
}
.sec-head::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--hairline-strong);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.9s var(--ease) 0.2s;
}
.sec-head.is-in::before { transform: scaleX(1); }
.sec-no {
  font-family: var(--serif-latin);
  font-style: italic;
  font-weight: 420;
  font-size: clamp(2rem, 3.4vw, 2.7rem);
  color: var(--violet);
  line-height: 1;
}
.sec-head h2 {
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  font-weight: 700;
}
.sec-label {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* ---------- 01 能力索引（行 × 示意面板联动） ---------- */

.sec-lead {
  margin: 1.5rem 0 2.4rem;
  font-size: 1.02rem;
  color: var(--ink-2);
  max-width: 40em;
}
.sec-lead strong {
  color: var(--ink);
  font-weight: 600;
}

.cap-index {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(2rem, 4vw, 4rem);
  align-items: start;
}

.cap-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.cap-row {
  position: relative;
  display: grid;
  grid-template-columns: 3.2rem 1fr;
  grid-template-areas:
    "no title"
    "no desc";
  column-gap: 0.4rem;
  row-gap: 0.3rem;
  align-items: baseline;
  width: calc(100% + 1.8rem);
  margin-inline: -0.9rem;
  padding: 1.35rem 0.9rem;
  text-align: left;
  background: none;
  border: 0;
  border-bottom: 1px solid var(--hairline);
  font: inherit;
  color: inherit;
  line-height: 1.75;
  cursor: pointer;
  transition: background-color 0.3s var(--ease);
}

.cap-no {
  grid-area: no;
  font-family: var(--serif-latin);
  font-style: italic;
  font-size: 1.05rem;
  color: var(--ink-3);
  transition: color 0.3s var(--ease);
}

.cap-title {
  grid-area: title;
  font-family: var(--serif);
  font-size: clamp(1.2rem, 1.8vw, 1.4rem);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.cap-core {
  display: inline-block;
  margin-left: 0.55em;
  padding: 0.16em 0.55em 0.2em;
  border-radius: 4px;
  border: 1px solid color-mix(in oklab, var(--violet) 45%, transparent);
  background: color-mix(in oklab, var(--violet) 8%, transparent);
  color: var(--violet-deep);
  font-family: var(--sans);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  vertical-align: 0.34em;
}

.cap-desc {
  grid-area: desc;
  display: block;
  font-size: 0.93rem;
  color: var(--ink-2);
  max-width: 30em;
}

.cap-row::after {
  content: "→";
  position: absolute;
  right: 1.1rem;
  top: 50%;
  translate: -4px -50%;
  opacity: 0;
  font-family: var(--serif-latin);
  font-size: 1.1rem;
  color: var(--violet);
  transition: opacity 0.3s var(--ease), translate 0.3s var(--ease);
}

.cap-row:hover,
.cap-row:focus-visible {
  background: color-mix(in oklab, var(--panel) 40%, transparent);
}
.cap-row.is-active {
  background: color-mix(in oklab, var(--panel) 55%, transparent);
}
.cap-row.is-active .cap-no { color: var(--violet); }
.cap-row.is-active::after { opacity: 1; translate: 0 -50%; }

/* —— 示意面板 —— */

.cap-panel {
  position: sticky;
  top: 6.5rem;
}

.cap-panel-frame {
  position: relative;
  display: grid;
  min-height: 19.5rem;
  background: oklch(0.995 0.003 95);
  border: 1px solid var(--hairline);
  border-radius: 10px;
  box-shadow: 0 24px 50px -34px color-mix(in oklab, var(--ink) 40%, transparent);
  overflow: hidden;
}

.vig {
  grid-area: 1 / 1;
  display: flex;
  flex-direction: column;
  padding: 1.35rem 1.4rem 1.15rem;
  opacity: 0;
  translate: 0 8px;
  pointer-events: none;
  transition: opacity 0.45s var(--ease), translate 0.45s var(--ease);
}
.vig.is-active {
  opacity: 1;
  translate: 0 0;
}

/* 切换时面板内容逐项浮入 */
.vig.is-active > * {
  animation: vig-child-in 0.5s var(--ease) both;
}
.vig.is-active > *:nth-child(2) { animation-delay: 0.07s; }
.vig.is-active > *:nth-child(3) { animation-delay: 0.14s; }

@keyframes vig-child-in {
  from { opacity: 0; translate: 0 10px; }
}

.vig-head {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 1.2rem;
}
.vig-head::after {
  content: "";
  display: block;
  width: 2.2rem;
  height: 1px;
  background: var(--violet);
  margin-top: 0.75rem;
}

.vig-note {
  margin-top: auto;
  padding-top: 1.1rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.03em;
  color: var(--ink-3);
}

/* 证据链 */
.vig-chain {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
  position: relative;
}
.vig-chain::before {
  content: "";
  position: absolute;
  left: 0.56rem;
  top: 1rem;
  bottom: 1rem;
  width: 1px;
  background: var(--hairline);
}
.vig-chain li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.88rem;
  color: var(--ink);
  position: relative;
}
.vig-mark {
  flex: none;
  width: 1.15rem;
  height: 1.15rem;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  color: var(--violet-deep);
  background: color-mix(in oklab, var(--violet) 10%, transparent);
  border: 1px solid color-mix(in oklab, var(--violet) 40%, transparent);
  z-index: 1;
}

/* 通用行列表（文件 / 插件 / 模型） */
.vig-rows {
  list-style: none;
  margin: 0;
  padding: 0;
}
.vig-rows li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.62rem;
  border-bottom: 1px solid var(--hairline);
  font-size: 0.88rem;
  color: var(--ink);
}
.vig-rows li > span:first-child {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}
.vig-meta {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--ink-3);
  white-space: nowrap;
}

.vig-led {
  flex: none;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--hairline-strong);
}
.vig-led.on {
  background: var(--violet);
  animation: dot-pulse 2.4s ease-in-out infinite;
}

.vig-radio {
  flex: none;
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 50%;
  border: 1px solid var(--hairline-strong);
}
.vig-radio.on {
  border-color: var(--violet);
  background: var(--violet);
  box-shadow: inset 0 0 0 2.2px oklch(0.995 0.003 95);
}

/* 画布版本 */
.vig-stage {
  position: relative;
  height: 9rem;
}
.vig-thumb {
  position: absolute;
  width: 7.5rem;
  height: 7.5rem;
  border-radius: 8px;
  border: 1px solid var(--hairline-strong);
  background: var(--paper-deep);
  display: flex;
  align-items: flex-end;
  padding: 0.45rem 0.6rem;
  font-family: var(--mono);
  font-size: 0.66rem;
  color: var(--ink-3);
}
.vig-thumb.t1 {
  left: 8%;
  top: 0.4rem;
  rotate: -3deg;
  animation: thumb-drift 6.5s ease-in-out infinite alternate;
}
.vig-thumb.t2 {
  left: 36%;
  top: 1.6rem;
  rotate: 2deg;
  background: color-mix(in oklab, var(--violet) 14%, var(--paper));
  border-color: color-mix(in oklab, var(--violet) 40%, transparent);
  color: var(--violet-deep);
  animation: thumb-drift 5.5s ease-in-out 0.6s infinite alternate-reverse;
}

@keyframes thumb-drift {
  from { translate: 0 0; }
  to { translate: 0 5px; }
}

/* ---------- 02 工作流 ---------- */

.section-workflow {
  background: var(--paper-deep);
  border-block: 1px solid var(--hairline);
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.5rem, 3.5vw, 3.5rem);
}

.step {
  position: relative;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 1.1rem;
  padding-top: 1.4rem;
}
.step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--hairline-strong);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.8s var(--ease) 0.15s, background-color 0.3s var(--ease);
}
.step.is-in::before { transform: scaleX(1); }
.step:hover::before { background: var(--violet); }

.step-no {
  font-family: var(--serif-latin);
  font-style: italic;
  font-weight: 560;
  font-size: clamp(2.6rem, 4.4vw, 3.6rem);
  line-height: 1;
  color: var(--ink);
}

.step h3 {
  font-size: 1.25rem;
  margin-bottom: 0.55rem;
}
.step p {
  color: var(--ink-2);
  font-size: 0.95rem;
}

.inline-mark {
  color: var(--violet-deep);
  background: color-mix(in oklab, var(--violet) 9%, transparent);
  border-radius: 4px;
  padding-inline: 0.3em;
  font-size: 0.92em;
}

/* ---------- 03 原则 ---------- */

.statement {
  font-family: var(--serif);
  font-size: clamp(1.55rem, 3.2vw, 2.35rem);
  font-weight: 600;
  line-height: 1.5;
  max-width: 24em;
  padding-block: clamp(2.2rem, 5vh, 3.4rem);
}
.statement .hl {
  background-image: linear-gradient(var(--panel), var(--panel));
  background-repeat: no-repeat;
  background-size: 0% 0.72em;
  background-position: 0 82%;
  transition: background-size 1.1s var(--ease) 0.3s;
}
.statement.is-in .hl { background-size: 100% 0.72em; }
.statement-sub {
  display: block;
  font-size: 0.52em;
  font-weight: 500;
  color: var(--ink-2);
  margin-top: 1.1em;
  max-width: 34em;
}

.spec { margin: 0; }

.spec-row {
  display: grid;
  grid-template-columns: minmax(8rem, 14rem) 1fr;
  gap: 1.5rem;
  padding-block: 1.05rem;
  border-top: 1px solid var(--hairline);
}
.spec-row:nth-child(2) { transition-delay: 0.07s; }
.spec-row:nth-child(3) { transition-delay: 0.14s; }
.spec-row:nth-child(4) { transition-delay: 0.21s; }
.spec-row:nth-child(5) { transition-delay: 0.28s; }
.spec-row:nth-child(6) { transition-delay: 0.35s; }
.spec-row:last-child { border-bottom: 1px solid var(--hairline); }

.spec dt {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--ink-3);
  padding-top: 0.28em;
}
.spec dd {
  margin: 0;
  color: var(--ink);
  font-size: 0.98rem;
}

/* ---------- 04 下载 ---------- */

.section-download {
  background: var(--ink);
  color: var(--ink-inverse);
  padding-block: clamp(5.5rem, 13vh, 9rem);
}

.eyebrow-inverse {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: color-mix(in oklab, var(--ink-inverse) 55%, transparent);
  margin-bottom: 1.8rem;
}
.eyebrow-inverse::before {
  content: "";
  display: inline-block;
  width: 1.6rem;
  height: 1px;
  background: var(--violet-bright);
  vertical-align: middle;
  margin-right: 0.8rem;
}

.download-title {
  font-size: clamp(2.2rem, 4.6vw, 3.6rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 2.6rem;
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-bottom: 1.6rem;
}
.download-actions .btn:nth-child(2) { transition-delay: 0.08s; }
.download-actions .btn:nth-child(3) { transition-delay: 0.16s; }

.download-note {
  font-size: 0.88rem;
  color: color-mix(in oklab, var(--ink-inverse) 62%, transparent);
  max-width: 38em;
}

/* —— 下载帮助面板（深色区内） —— */

.download-help {
  margin-top: 3.2rem;
  display: grid;
  gap: 0.9rem;
  max-width: 46rem;
}

.help-panel {
  border: 1px solid color-mix(in oklab, var(--ink-inverse) 16%, transparent);
  border-radius: 10px;
  background: color-mix(in oklab, var(--ink-inverse) 4%, transparent);
  overflow: hidden;
  transition: border-color 0.3s var(--ease);
}
.help-panel:hover {
  border-color: color-mix(in oklab, var(--ink-inverse) 30%, transparent);
}

.help-panel summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.95rem 1.2rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink-inverse);
  user-select: none;
  transition: background-color 0.25s var(--ease);
}
.help-panel summary::-webkit-details-marker { display: none; }
.help-panel summary:hover {
  background: color-mix(in oklab, var(--ink-inverse) 6%, transparent);
}
.help-panel summary::before {
  content: "+";
  flex: none;
  width: 1.35rem;
  height: 1.35rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid color-mix(in oklab, var(--violet-bright) 55%, transparent);
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--violet-bright);
  transition: rotate 0.35s var(--ease);
}
.help-panel[open] summary::before {
  content: "−";
  rotate: 180deg;
}
.help-panel[open] summary {
  border-bottom: 1px solid color-mix(in oklab, var(--ink-inverse) 12%, transparent);
}

.help-body {
  padding: 1.15rem 1.2rem 1.3rem;
  animation: help-in 0.45s var(--ease) both;
}
@keyframes help-in {
  from { opacity: 0; translate: 0 -6px; }
}

.help-body > p {
  font-size: 0.9rem;
  line-height: 1.85;
  color: color-mix(in oklab, var(--ink-inverse) 80%, transparent);
  margin-bottom: 0.8rem;
}

.kbd {
  font-family: var(--mono);
  font-size: 0.82em;
  border: 1px solid color-mix(in oklab, var(--ink-inverse) 30%, transparent);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0.08em 0.5em;
}

.chip-check {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}
.chip-check li {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-size: 0.88rem;
  color: color-mix(in oklab, var(--ink-inverse) 85%, transparent);
}
.chip-tag {
  flex: none;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--violet-bright);
  border: 1px solid color-mix(in oklab, var(--violet-bright) 45%, transparent);
  background: color-mix(in oklab, var(--violet-bright) 10%, transparent);
  border-radius: 4px;
  padding: 0.22em 0.6em;
}

.help-more {
  margin-top: 1rem;
}
.help-more a {
  color: var(--violet-bright);
  font-size: 0.85rem;
  text-decoration: none;
  border-bottom: 1px solid color-mix(in oklab, var(--violet-bright) 45%, transparent);
  padding-bottom: 0.15em;
  transition: border-color 0.25s var(--ease);
}
.help-more a:hover { border-color: var(--violet-bright); }

.gatekeeper-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  gap: 1.5rem;
  align-items: center;
}

.gatekeeper-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: gk;
  display: grid;
  gap: 0.85rem;
}
.gatekeeper-steps li {
  counter-increment: gk;
  display: flex;
  gap: 0.75rem;
  font-size: 0.88rem;
  line-height: 1.75;
  color: color-mix(in oklab, var(--ink-inverse) 85%, transparent);
}
.gatekeeper-steps li::before {
  content: counter(gk);
  flex: none;
  width: 1.35rem;
  height: 1.35rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.2rem;
  border: 1px solid color-mix(in oklab, var(--ink-inverse) 28%, transparent);
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--violet-bright);
}

/* macOS 系统弹窗示意（纯 CSS） */
.mac-dialog {
  margin: 0;
  background: oklch(0.972 0.004 95);
  border-radius: 10px;
  padding: 1.15rem 1.2rem 1.05rem;
  box-shadow: 0 22px 44px -20px oklch(0 0 0 / 0.5);
}
.mac-dialog-title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 0.92rem;
  text-align: center;
  color: var(--ink);
  margin-bottom: 0.5rem;
}
.mac-dialog-text {
  font-size: 0.76rem;
  line-height: 1.7;
  text-align: center;
  color: var(--ink-2);
  margin-bottom: 1rem;
}
.mac-dialog-actions {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
}
.mac-btn {
  font-size: 0.76rem;
  color: var(--ink);
  border: 1px solid var(--hairline);
  border-radius: 6px;
  padding: 0.4em 0.95em;
  background: oklch(0.995 0.003 95);
}
.mac-btn-primary {
  background: color-mix(in oklab, var(--ink) 88%, var(--ink-inverse));
  color: var(--ink-inverse);
  border-color: transparent;
}

/* ---------- 页脚 ---------- */

.site-foot {
  background: var(--ink);
  color: var(--ink-inverse);
  border-top: 1px solid color-mix(in oklab, var(--ink-inverse) 14%, transparent);
  padding-block: 2.6rem 2.2rem;
}

.foot-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 1rem 2.5rem;
}

.foot-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin-right: auto;
}
.foot-logo {
  display: block;
  width: 1.8rem;
  height: 1.8rem;
  flex: 0 0 auto;
  object-fit: contain;
}
.foot-brand .wordmark-cn { color: var(--ink-inverse); }
.foot-brand .wordmark-latin {
  color: color-mix(in oklab, var(--ink-inverse) 55%, transparent);
}

.foot-links { display: flex; gap: 1.6rem; }
.foot-links a {
  font-size: 0.88rem;
  color: color-mix(in oklab, var(--ink-inverse) 72%, transparent);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
.foot-links a:hover { color: var(--ink-inverse); }

.foot-copy {
  width: 100%;
  font-size: 0.8rem;
  color: color-mix(in oklab, var(--ink-inverse) 48%, transparent);
  margin-top: 0.4rem;
}

/* ---------- 进场动效 ---------- */

[data-reveal] {
  opacity: 0;
  translate: 0 16px;
  transition: opacity 0.75s var(--ease), translate 0.75s var(--ease);
}
[data-reveal].is-in {
  opacity: 1;
  translate: 0 0;
}

/* Hero 内错峰 */
.hero [data-reveal] { transition-delay: 0.05s; }
.hero .d-1 { transition-delay: 0.14s; }
.hero .d-2 { transition-delay: 0.22s; }

/* 章节内行级错峰 */
.cap-list li:nth-child(2) { transition-delay: 0.06s; }
.cap-list li:nth-child(3) { transition-delay: 0.12s; }
.cap-list li:nth-child(4) { transition-delay: 0.18s; }
.cap-list li:nth-child(5) { transition-delay: 0.24s; }
.step:nth-child(2) { transition-delay: 0.1s; }
.step:nth-child(3) { transition-delay: 0.2s; }

/* ---------- 响应式 ---------- */

@media (max-width: 1020px) {
  .hero-copy { grid-column: 1 / 13; }
  .hero-visual {
    grid-column: 1 / 13;
    margin-top: 1.5rem;
    max-width: 40rem;
  }
  .cap-index { grid-template-columns: 1fr; }
  .cap-panel { display: none; }
}

@media (max-width: 820px) {
  .nav-inner {
    position: relative;
    gap: 0.65rem;
  }
  .nav-inner > .btn {
    min-height: 2.75rem;
    margin-left: auto;
  }
  .site-nav.has-menu .nav-toggle { display: grid; }
  .nav-links {
    position: absolute;
    top: calc(100% + 1px);
    right: var(--gutter);
    left: var(--gutter);
    display: grid;
    gap: 0;
    margin: 0;
    padding: 0.45rem;
    border: 1px solid var(--hairline-strong);
    border-top: 0;
    background: var(--paper);
    box-shadow: 0 1.2rem 2.5rem color-mix(in oklab, var(--ink) 12%, transparent);
  }
  .site-nav.has-menu .nav-links {
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
    translate: 0 -0.45rem;
    transition: visibility 0.2s, opacity 0.2s var(--ease), translate 0.2s var(--ease);
  }
  .site-nav.has-menu.is-menu-open .nav-links {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
    translate: 0 0;
  }
  .nav-links a {
    display: flex;
    align-items: center;
    min-height: 2.75rem;
    padding-inline: 0.8rem;
    border-bottom: 1px solid var(--hairline);
    font-size: 0.95rem;
  }
  .nav-links a:last-child { border-bottom: 0; }
  .nav-links a::after { display: none; }
}

@media (max-width: 760px) {

  .hero h1 { font-size: clamp(2.1rem, 9vw, 2.7rem); }

  .steps { grid-template-columns: 1fr; }

  .cap-row {
    padding-block: 1.05rem;
    grid-template-columns: 2.4rem 1fr;
  }
  .cap-row::after { display: none; }

  .gatekeeper-grid { grid-template-columns: 1fr; }
  .mac-dialog { max-width: 20rem; }

  .spec-row { grid-template-columns: 1fr; gap: 0.3rem; }

  .visual-block { inset: 1.4rem -0.6rem -1rem 1.4rem; }

  .download-actions .btn { width: 100%; justify-content: center; }

  .foot-links {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    width: 100%;
    gap: 0;
    border-top: 1px solid color-mix(in oklab, var(--ink-inverse) 18%, transparent);
  }
  .foot-links a {
    display: flex;
    align-items: center;
    min-height: 2.75rem;
    border-bottom: 1px solid color-mix(in oklab, var(--ink-inverse) 18%, transparent);
  }
}

@media (max-width: 380px) {
  .wordmark { gap: 0.45rem; }
  .wordmark-logo { width: 2.1rem; height: 2.1rem; }
  .wordmark-cn { font-size: 1.08rem; }
  .wordmark-latin { font-size: 0.58rem; letter-spacing: 0.09em; }
  .nav-inner > .btn { padding-inline: 0.8rem; font-size: 0.78rem; }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
  }
  [data-reveal] { opacity: 1; translate: 0 0; }
}