/* ================================================================
   影刀 AI WorkOS — 整站重设计
   调性: 克制 / 高档 / 编辑感 / 暖白 + 深墨
   ================================================================ */

/* ----- 1. 设计令牌 ---------------------------------------------- */
  :root {
      /* 色彩 — Linear/Stripe 紫蓝产品页风 */
      --paper: #ffffff;            /* 主背景 · 纯白 */
      --paper-2: #fafafa;          /* 次级背景 */
      --paper-3: #f4f4f5;          /* 卡片/边线灰 */
      --ink: #0a0a0f;              /* 主文字 · 暖近黑 */
      --ink-2: #1f1f23;            /* 次级文字 */
      --ink-3: #71717a;            /* 弱化文字 */
      --ink-4: #a1a1aa;            /* 标签/注释 */
      --line: rgba(10,10,15,0.08);
      --line-2: rgba(10,10,15,0.04);
      --line-strong: rgba(10,10,15,0.16);
      --accent: #5b5bd6;           /* 主紫色 · 产品页主调 */
      --accent-2: #4747b8;         /* 深紫 */
      --accent-3: #818cf8;         /* 浅紫 */
      --accent-bg: rgba(91,91,214,0.06);  /* 浅紫底 */
      --gold: #f4f4f5;             /* 不再用金色 */

      /* 字号（产品页克制）*/
      --fs-display: clamp(2.8rem, 7vw, 5.2rem);
      --fs-h1: clamp(2rem, 5vw, 3.6rem);
      --fs-h2: clamp(1.6rem, 3.6vw, 2.8rem);
      --fs-h3: clamp(1.2rem, 2.2vw, 1.55rem);
      --fs-h4: 1.125rem;
      --fs-body: 1rem;
      --fs-small: 0.875rem;
      --fs-tiny: 0.75rem;
      --fs-eyebrow: 0.75rem;

      /* 间距 */
      --pad-section-y: clamp(80px, 10vw, 140px);
      --container: 1200px;
      --gutter: clamp(20px, 4vw, 40px);
      --radius: 8px;
      --radius-lg: 12px;

      /* 字体 — 产品页无衬线 */
      --font-zh-display: "Inter", -apple-system, system-ui, sans-serif;
      --font-zh-body: "Inter", -apple-system, system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-en-display: "Inter", -apple-system, system-ui, sans-serif;
      --font-en-body: "Inter", -apple-system, system-ui, sans-serif;
      --font-mono: "JetBrains Mono", ui-monospace, monospace;

      /* 时间 */
      --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
      --t-fast: 180ms;
      --t-base: 360ms;
      --t-slow: 640ms;
    }

/* ----- 2. 全局与重置 ------------------------------------------- */
*,*::before,*::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-zh-body), var(--font-en-body);
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  /* 微颗粒 — 让纸面有质感 */
  background-image:
    radial-gradient(circle at 20% 12%, rgba(160,133,80,0.05), transparent 38%),
    radial-gradient(circle at 80% 90%, rgba(185,70,40,0.04), transparent 42%);
  background-attachment: fixed;
  overflow-x: hidden;
}

::selection { background: var(--ink); color: var(--paper); }

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; padding: 0; }
input, textarea { font: inherit; color: inherit; }

img, svg { display: block; max-width: 100%; }

/* 数字/英文使用更精致的 fallback */
.num, em, strong, code, .brand-en {
  font-feature-settings: "tnum" 1, "lnum" 1, "ss01" 1;
}

/* ----- 3. 容器与基础排版 --------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section {
  position: relative;
  padding: var(--pad-section-y) 0;
  border-top: 1px solid var(--line-2);
}
.section:first-of-type { border-top: 0; }

.sec-head {
  max-width: 880px;
  margin: 0 0 clamp(36px, 5vw, 64px);
}
.sec-head-case { max-width: 880px; }

.sec-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-en-display);
  letter-spacing: 0.18em;
  font-size: var(--fs-eyebrow);
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 24px;
}
.sec-eyebrow span {
  font-family: var(--font-zh-body);
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.1em;
}

.sec-title {
  font-family: var(--font-zh-display), var(--font-en-display);
  font-weight: 500;
  font-size: var(--fs-h2);
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0 0 20px;
  color: var(--ink);
}
.sec-title em {
  font-style: italic;
  font-weight: 500;
  color: var(--accent);
}

.sec-lead {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--ink-3);
  max-width: 720px;
  margin: 0;
}
.sec-lead strong { color: var(--ink); font-weight: 600; }

.block-title {
  font-family: var(--font-zh-display);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 0 0 32px;
}

/* ----- 4. 按钮 --------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: 999px;
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: transform var(--t-fast) var(--ease), background var(--t-base) var(--ease), color var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.btn-primary:hover { background: var(--accent-2); border-color: var(--accent-2); }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-strong);
}
.btn-ghost:hover { border-color: var(--ink); }

/* 文本高亮 */
.hl {
  border-bottom: 1px solid var(--accent);
  padding-bottom: 1px;
  font-weight: 500;
  color: var(--ink);
}
.hl:nth-of-type(2) { border-color: var(--gold); }
.hl:nth-of-type(3) { border-color: var(--ink-3); }

/* ----- 5. NAV ---------------------------------------------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(244, 239, 230, 0.78);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--line-2);
  transition: background var(--t-base) var(--ease), border-color var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
}
.nav.is-pinned {
  background: rgba(244, 239, 230, 0.95);
  border-bottom-color: var(--line);
  box-shadow: 0 1px 0 var(--line-2), 0 12px 28px -16px rgba(20,16,11,0.10);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px var(--gutter);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
}
.brand-mark {
  display: inline-flex;
  color: var(--ink);
  transition: color var(--t-base) var(--ease);
}
.brand-text { display: inline-flex; align-items: baseline; gap: 8px; }
.brand-zh {
  font-family: var(--font-zh-display);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.brand-en {
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 0.95rem;
  color: var(--ink-3);
  font-weight: 400;
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-links a {
  font-size: 0.875rem;
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--ink-3);
  transition: color var(--t-base) var(--ease), background var(--t-base) var(--ease);
}
.nav-links a:hover { color: var(--ink); background: rgba(20,16,11,0.04); }
.nav-cta {
  margin-left: 10px;
  color: var(--ink) !important;
  background: var(--paper-3);
  border: 1px solid var(--line-strong);
}
.nav-cta:hover { background: var(--ink); color: var(--paper) !important; border-color: var(--ink); }

.nav-burger {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  position: relative;
}
.nav-burger span {
  display: block;
  position: absolute;
  width: 18px;
  height: 1.2px;
  background: var(--ink);
  left: 11px;
  transition: transform var(--t-base) var(--ease), opacity var(--t-base) var(--ease);
}
.nav-burger span:nth-child(1) { transform: translateY(-5px); }
.nav-burger span:nth-child(3) { transform: translateY(5px); }
.nav-burger.is-open span:nth-child(1) { transform: rotate(45deg); }
.nav-burger.is-open span:nth-child(2) { opacity: 0; }
.nav-burger.is-open span:nth-child(3) { transform: rotate(-45deg); }

/* ----- 6. HERO --------------------------------------------------- */
.hero {
  position: relative;
  padding: clamp(80px, 14vw, 160px) 0 clamp(72px, 11vw, 140px);
  overflow: hidden;
  background:
    linear-gradient(180deg, transparent 0%, rgba(244,239,230,0) 50%, var(--paper) 100%),
    radial-gradient(ellipse at 50% 100%, var(--paper-2) 0%, transparent 60%);
}
.hero-grain {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(0deg, rgba(20,16,11,0.025) 0 1px, transparent 1px 4px),
    repeating-linear-gradient(90deg, rgba(20,16,11,0.025) 0 1px, transparent 1px 4px);
  opacity: 0.55;
  mix-blend-mode: multiply;
  mask-image: radial-gradient(ellipse at 50% 30%, black 0%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 30%, black 0%, transparent 80%);
}

.hero-inner { position: relative; }

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  color: var(--ink-3);
  padding: 8px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(244,239,230,0.6);
  margin-bottom: 36px;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}
.hero-eyebrow .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(185,70,40,0.18);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(185,70,40,0.16); }
  50% { box-shadow: 0 0 0 8px rgba(185,70,40,0.04); }
}

.hero-title {
  font-family: var(--font-zh-display), var(--font-en-display);
  font-weight: 500;
  font-size: var(--fs-display);
  line-height: 1.08;
  letter-spacing: -0.025em;
  margin: 0 0 32px;
  max-width: 16ch;
}
.hero-title em {
  font-style: italic;
  font-weight: 400;
  font-family: var(--font-en-display);
  color: var(--accent);
  position: relative;
  padding: 0 0.05em;
}
.hero-title em::after {
  content: "";
  position: absolute;
  left: 4%; right: 4%; bottom: -2px;
  height: 2px;
  background: var(--accent);
  opacity: 0.6;
}

.hero-sub {
  font-size: 1.0625rem;
  line-height: 1.95;
  color: var(--ink-3);
  max-width: 740px;
  margin: 0 0 40px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0 0 64px;
}

.hero-quote {
  border-left: 2px solid var(--accent);
  padding: 8px 0 8px 22px;
  margin: 0 0 56px;
  max-width: 680px;
}
.hero-quote p {
  font-family: var(--font-zh-display);
  font-style: italic;
  font-size: 1.25rem;
  line-height: 1.6;
  color: var(--ink-2);
  margin: 0;
}
.hero-quote strong {
  font-weight: 600;
  color: var(--accent-2);
  font-style: normal;
}

.hero-tickers {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  max-width: 880px;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  padding: 20px 0;
}
.ticker {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 4px 18px;
  border-left: 1px solid var(--line-2);
}
.ticker:first-child { border-left: 0; padding-left: 0; }
.ticker-num {
  font-family: var(--font-en-display);
  font-weight: 500;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--ink);
  font-style: italic;
}
.ticker-lbl {
  font-size: var(--fs-tiny);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-4);
}

.hero-scroll {
  position: absolute;
  right: var(--gutter);
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--ink-4);
  text-transform: uppercase;
}
.hero-scroll svg { animation: nudgedown 2.4s ease-in-out infinite; }
@keyframes nudgedown {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(4px); }
}

/* ----- 7. METHODOLOGY ------------------------------------------- */
.sec-method { background: linear-gradient(180deg, transparent, rgba(232,225,211,0.4) 50%, transparent); }

.method-pipeline {
  margin: 0 0 80px;
}
.pipeline-mnemonic {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px;
  margin-top: 22px;
  padding: 16px 20px;
  border: 1px dashed var(--line-strong);
  border-radius: 4px;
  background: rgba(232,225,211,0.4);
}
.mnemonic-label {
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  flex-shrink: 0;
}
.mnemonic-text {
  font-family: var(--font-zh-display);
  font-size: 1.0625rem;
  letter-spacing: 0.02em;
  color: var(--ink-2);
  line-height: 1.6;
}
.pipeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}
.pipeline li {
  position: relative;
  padding: 28px 16px 28px;
  border-left: 1px solid var(--line-2);
  transition: background var(--t-base) var(--ease);
}
.pipeline li:first-child { border-left: 0; }
.pipeline li:hover { background: rgba(20,16,11,0.025); }

.step-i {
  display: block;
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}
.step-t {
  display: block;
  font-family: var(--font-zh-display);
  font-size: 1.125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ink);
  margin-bottom: 6px;
}
.step-d {
  display: block;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--ink-3);
}

.method-stages {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line-strong);
}
.stage {
  position: relative;
  padding: 36px 32px 36px 56px;
  border-left: 1px solid var(--line);
}
.stage:first-child { border-left: 0; padding-left: 0; }

.stage-mark {
  position: absolute;
  top: 36px;
  left: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 1.125rem;
  color: var(--accent);
  background: var(--paper);
  transform: translateX(-20px);
}

.stage-meta {
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 8px;
}
.stage h3 {
  font-family: var(--font-zh-display);
  font-size: 1.6rem;
  font-weight: 500;
  letter-spacing: -0.005em;
  margin: 0 0 14px;
  color: var(--ink);
}
.stage p {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ink-3);
  margin: 0 0 18px;
}
.stage blockquote {
  margin: 0;
  padding: 14px 18px;
  border-left: 2px solid var(--accent);
  background: rgba(185,70,40,0.04);
  font-size: 0.9375rem;
  color: var(--ink-2);
  font-family: var(--font-zh-display);
}
.stage blockquote strong { color: var(--accent-2); font-weight: 600; }

.method-quote {
  margin-top: 64px;
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.method-quote .quote-mark {
  font-family: var(--font-en-display);
  font-size: 4rem;
  line-height: 0.6;
  color: var(--accent);
  font-style: italic;
}
.method-quote p {
  font-family: var(--font-zh-display);
  font-size: 1.25rem;
  line-height: 1.55;
  margin: 0;
  color: var(--ink-2);
}
.method-quote strong {
  font-weight: 600;
  color: var(--accent-2);
}

/* ----- 8. NARRATIVE --------------------------------------------- */
.sec-narrative { background: linear-gradient(180deg, transparent, rgba(232,225,211,0.3) 60%, transparent); }

.narr-flow {
  margin-bottom: clamp(48px, 7vw, 80px);
}
.narr-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--line-strong);
}
.narr-steps li {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 24px;
  align-items: baseline;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
  transition: background var(--t-base) var(--ease);
}
.narr-steps li:hover { background: rgba(20,16,11,0.025); }

.ns-i {
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 2rem;
  color: var(--accent);
  letter-spacing: 0.04em;
  line-height: 1;
}
.narr-steps strong {
  display: block;
  font-family: var(--font-zh-display);
  font-weight: 500;
  font-size: 1.25rem;
  color: var(--ink);
  letter-spacing: -0.005em;
  margin-bottom: 4px;
}
.narr-steps em {
  font-family: var(--font-zh-display);
  font-style: italic;
  font-size: 1rem;
  color: var(--ink-3);
  line-height: 1.5;
}

.narr-workers { padding-top: 12px; }
.workers {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}
.worker {
  padding: 32px 28px;
  border-left: 1px solid var(--line);
  position: relative;
  background: var(--paper);
}
.worker:first-child { border-left: 0; }
.worker-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}
.worker-tag {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-en-display);
  font-style: italic;
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--ink);
  background: var(--paper-2);
}
.worker-human .worker-tag { color: var(--accent); border-color: var(--accent); }
.worker-agent .worker-tag { color: var(--ink); border-color: var(--ink); }
.worker-rpa .worker-tag { color: var(--gold); border-color: var(--gold); }

.worker h4 {
  font-family: var(--font-zh-display);
  font-size: 1.25rem;
  font-weight: 500;
  margin: 0;
  color: var(--ink);
  letter-spacing: 0.005em;
  line-height: 1.2;
}
.worker-en {
  display: block;
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--ink-4);
  letter-spacing: 0.04em;
  margin-top: 2px;
}
.worker-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.worker-list li {
  position: relative;
  padding: 10px 0 10px 18px;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--ink-2);
  border-bottom: 1px dashed var(--line);
}
.worker-list li:last-child { border-bottom: 0; }
.worker-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 8px;
  height: 1.2px;
  background: var(--ink-3);
}

.narr-principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin-top: 32px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.principle {
  padding: 24px 24px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  border-left: 1px solid var(--line);
}
.principle:first-child { border-left: 0; }
.principle-mark {
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  margin-top: 12px;
  border-radius: 50%;
  background: var(--accent);
}
.principle p {
  margin: 0;
  font-family: var(--font-zh-display);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--ink-2);
}
.principle strong { font-weight: 600; color: var(--accent-2); }

/* ----- 9. LOOP -------------------------------------------------- */
.sec-loop {
  background:
    radial-gradient(ellipse at 50% 0%, rgba(232,225,211,0.55) 0%, transparent 60%),
    var(--paper);
}

.loop-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 6vw, 80px);
  align-items: center;
}

.loop-viz {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  max-width: 460px;
  margin: 0 auto;
}
.loop-ring { position: relative; width: 100%; height: 100%; overflow: visible; }
.ring-svg { position: absolute; inset: 0; width: 100%; height: 100%; color: var(--ink); pointer-events: none; }

.loop-node {
  position: absolute;
  width: clamp(78px, 28%, 108px);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-family: var(--font-zh-display);
  cursor: pointer;
  transition: border-color var(--t-base) var(--ease), background var(--t-base) var(--ease), transform var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
  padding: 6px;
  box-shadow: 0 6px 18px -8px rgba(20,16,11,0.16);
}
.loop-node:hover {
  border-color: var(--accent);
  background: var(--paper);
  z-index: 2;
}
.loop-node-1:hover { transform: translate(-50%, -50%) scale(1.04); }
.loop-node-2:hover { transform: translate(-50%, -50%) scale(1.04); }
.loop-node-3:hover { transform: translate(-50%, -50%) scale(1.04); }
.loop-node-4:hover { transform: translate(-50%, -50%) scale(1.04); }
.loop-node span.loop-i {
  display: block;
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 0.65rem;
  color: var(--ink-4);
  letter-spacing: 0.1em;
  margin-bottom: 2px;
}
.loop-node strong {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--ink);
  letter-spacing: 0.02em;
}
.loop-node em {
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 0.65rem;
  color: var(--ink-4);
  margin-top: 1px;
}

/* 节点位置：节点中心 = 容器中心 ± 41.67%（对应 SVG 外环 r=150/360） */
.loop-node-1 { top: 8.33%; left: 50%; transform: translate(-50%, -50%); }
.loop-node-2 { top: 50%; left: 91.67%; transform: translate(-50%, -50%); }
.loop-node-3 { top: 91.67%; left: 50%; transform: translate(-50%, -50%); }
.loop-node-4 { top: 50%; left: 8.33%; transform: translate(-50%, -50%); }
.loop-node-1.is-active { transform: translate(-50%, -50%) scale(1.06); z-index: 3; box-shadow: 0 10px 26px -6px rgba(185,70,40,0.28); }
.loop-node-2.is-active { transform: translate(-50%, -50%) scale(1.06); z-index: 3; box-shadow: 0 10px 26px -6px rgba(185,70,40,0.28); }
.loop-node-3.is-active { transform: translate(-50%, -50%) scale(1.06); z-index: 3; box-shadow: 0 10px 26px -6px rgba(185,70,40,0.28); }
.loop-node-4.is-active { transform: translate(-50%, -50%) scale(1.06); z-index: 3; box-shadow: 0 10px 26px -6px rgba(185,70,40,0.28); }

.loop-center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  pointer-events: none;
}
.loop-center-mark {
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: 6px;
  font-style: italic;
  font-family: var(--font-en-display);
}
.loop-center strong {
  font-family: var(--font-zh-display);
  font-size: 1.4rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ink);
  margin-bottom: 4px;
}
.loop-center em {
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 0.75rem;
  color: var(--ink-4);
  letter-spacing: 0.06em;
}

/* 详情卡 */
.loop-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.loop-card {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 22px 22px 24px;
  border-radius: var(--radius-lg);
  transition: border-color var(--t-base) var(--ease), background var(--t-base) var(--ease);
}
.loop-card:hover, .loop-card.is-active {
  border-color: var(--accent);
  background: linear-gradient(180deg, var(--paper), rgba(185,70,40,0.02));
}
.loop-card-tag {
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
.loop-card h4 {
  font-family: var(--font-zh-display);
  font-weight: 500;
  font-size: 1.125rem;
  margin: 0 0 14px;
  color: var(--ink);
}
.loop-card ul {
  margin: 0 0 14px;
  padding-left: 18px;
  font-size: 0.875rem;
  color: var(--ink-3);
  line-height: 1.8;
}
.loop-card ul li { padding: 2px 0; }

.layered {
  margin: 0 0 14px;
  padding: 0;
  list-style: none;
  counter-reset: l;
}
.layered li {
  counter-increment: l;
  position: relative;
  padding: 6px 0 6px 32px;
  border-bottom: 1px dashed var(--line);
  font-size: 0.875rem;
  color: var(--ink-2);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.layered li:last-child { border-bottom: 0; }
.layered li::before {
  content: counter(l, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 6px;
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 0.875rem;
  color: var(--accent);
}
.layered li::after {
  content: "→";
  color: var(--ink-4);
  font-family: var(--font-en-display);
}

.root-causes {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
}
.root-causes li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 6px 0;
  font-size: 0.875rem;
  color: var(--ink-2);
  border-bottom: 1px dashed var(--line);
}
.root-causes li:last-child { border-bottom: 0; }
.root-causes li span {
  flex-shrink: 0;
  width: 26px;
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 0.75rem;
  color: var(--gold);
  letter-spacing: 0.06em;
}

.loop-card-note {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--ink-4);
  font-family: var(--font-zh-display);
  font-style: italic;
}
.loop-card-note strong { color: var(--accent-2); font-weight: 600; font-style: normal; }

.loop-statement {
  margin-top: clamp(48px, 6vw, 72px);
  text-align: center;
  padding: 36px 24px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.loop-statement span {
  font-family: var(--font-zh-display);
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: var(--ink-2);
  font-style: italic;
  letter-spacing: 0.02em;
}
.loop-statement strong { font-weight: 600; font-style: normal; color: var(--accent-2); }

/* ----- 10. CASE ------------------------------------------------- */
.sec-case { background: var(--paper); }

.case-rail-wrap { position: relative; margin-bottom: 72px; }
.case-rail {
  position: absolute;
  left: 28px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--line-strong) 4%, var(--line-strong) 96%, transparent);
}

.case-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}
.case-item {
  position: relative;
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 32px;
  padding: 32px 0;
  border-bottom: 1px solid var(--line);
}
.case-item:last-child { border-bottom: 0; }

.case-marker {
  position: relative;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
}
.case-marker span {
  font-family: var(--font-en-display);
  font-style: italic;
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--accent);
  letter-spacing: 0.06em;
}
.case-item:hover .case-marker {
  border-color: var(--accent);
}

.case-content { padding-top: 6px; }
.case-phase {
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
.case-content h4 {
  font-family: var(--font-zh-display);
  font-size: 1.4rem;
  font-weight: 500;
  margin: 0 0 16px;
  letter-spacing: -0.005em;
  color: var(--ink);
  line-height: 1.3;
}
.case-content p {
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--ink-3);
  margin: 0 0 14px;
}
.case-content p strong { color: var(--ink); font-weight: 600; }
.case-content p code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--paper-2);
  padding: 1px 6px;
  border-radius: 3px;
  color: var(--accent-2);
}

.case-tagline {
  display: inline-block;
  font-family: var(--font-zh-display);
  font-style: italic;
  border-left: 2px solid var(--accent);
  padding: 2px 0 2px 14px;
  margin: 12px 0 0;
  color: var(--ink-2);
}
.case-tagline-strong { font-weight: 500; color: var(--accent-2); font-style: italic; border-left-width: 3px; }

.case-list {
  margin: 8px 0 16px;
  padding-left: 20px;
  font-size: 0.9375rem;
  color: var(--ink-3);
  line-height: 1.85;
}
.case-list li { padding: 3px 0; }
.case-list li strong { color: var(--ink); font-weight: 600; }
.case-list.ordered { counter-reset: ol; list-style: none; padding-left: 0; }
.case-list.ordered > li {
  counter-increment: ol;
  position: relative;
  padding: 6px 0 6px 32px;
  border-bottom: 1px dashed var(--line);
}
.case-list.ordered > li:last-child { border-bottom: 0; }
.case-list.ordered > li::before {
  content: counter(ol, decimal-leading-zero);
  position: absolute;
  left: 0; top: 8px;
  font-family: var(--font-en-display);
  font-style: italic;
  color: var(--accent);
  font-size: 0.875rem;
}

.case-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}
.case-summary-row {
  padding: 26px 24px;
  border-left: 1px solid var(--line);
}
.case-summary-row:first-child { border-left: 0; }
.case-summary-key {
  display: block;
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 12px;
}
.case-summary-val {
  font-family: var(--font-zh-display);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.005em;
}

/* ----- 11. SCENARIOS -------------------------------------------- */
.sec-scenarios {
  background: linear-gradient(180deg, transparent, rgba(232,225,211,0.45) 30%, transparent);
}

.scn-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}
.scn-search {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1 1 280px;
  min-width: 240px;
  padding: 12px 18px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--paper);
  transition: border-color var(--t-base) var(--ease);
}
.scn-search:focus-within { border-color: var(--ink); }
.scn-search svg { color: var(--ink-3); flex-shrink: 0; }
.scn-search input {
  flex: 1;
  border: 0;
  background: transparent;
  outline: none;
  font-size: 0.9375rem;
  color: var(--ink);
}
.scn-search input::placeholder { color: var(--ink-4); }

.scn-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  flex: 2 1 auto;
}
.scn-chip {
  padding: 7px 14px;
  font-size: 0.8125rem;
  color: var(--ink-2);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  transition: background var(--t-base) var(--ease), color var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
  white-space: nowrap;
}
.scn-chip:hover { border-color: var(--ink); }
.scn-chip.is-on {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.scn-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-left: auto;
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 0.875rem;
  color: var(--ink-3);
}
.scn-reset {
  font-size: 0.8125rem;
  color: var(--ink-3);
  border-bottom: 1px dashed currentColor;
  padding-bottom: 1px;
}
.scn-reset:hover { color: var(--accent); border-bottom-color: var(--accent); }

.scn-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.scn-card {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 22px 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color var(--t-base) var(--ease), background var(--t-base) var(--ease), transform var(--t-base) var(--ease);
}
.scn-card:hover {
  border-color: var(--ink);
  background: linear-gradient(180deg, var(--paper), rgba(20,16,11,0.02));
  transform: translateY(-2px);
}
.scn-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}
.scn-card-type {
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-4);
}
.scn-card-type[data-type="RPA"] { color: var(--gold); }
.scn-card-type[data-type="AI"] { color: var(--accent); }
.scn-card-type[data-type="RPA+AI"] { color: var(--ink); }

.scn-industry {
  font-size: 0.7rem;
  padding: 3px 10px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--ink-3);
  white-space: nowrap;
}

.scn-name {
  font-family: var(--font-zh-display);
  font-weight: 500;
  font-size: 1.05rem;
  line-height: 1.45;
  color: var(--ink);
  letter-spacing: -0.003em;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 2.9em;
}

.scn-overview {
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--ink-3);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.scn-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.scn-tag {
  font-size: 0.7rem;
  color: var(--ink-3);
  padding: 2px 8px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--paper-2);
}

.scn-card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 10px;
  border-top: 1px solid var(--line-2);
}
.scn-card-link {
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 0.8125rem;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  letter-spacing: 0.02em;
}
.scn-card-link:hover { color: var(--accent-2); }
.scn-card-link svg {
  width: 10px; height: 10px;
  transition: transform var(--t-base) var(--ease);
}
.scn-card:hover .scn-card-link svg { transform: translate(2px, -2px); }

.scn-empty {
  text-align: center;
  padding: 80px 20px;
  color: var(--ink-4);
  font-family: var(--font-zh-display);
  font-style: italic;
}
.scn-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 60px 20px 20px;
  color: var(--ink-4);
  font-family: var(--font-zh-display);
  font-size: 0.875rem;
  letter-spacing: 0.04em;
}
.scn-loading .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.5;
  animation: blink 1.4s ease-in-out infinite;
}
.scn-loading .dot:nth-child(2) { animation-delay: 0.18s; }
.scn-loading .dot:nth-child(3) { animation-delay: 0.36s; }
.scn-loading .lbl { margin-left: 12px; }
.scn-more {
  margin-top: 36px;
  text-align: center;
}

/* ----- 12. CONTACT ---------------------------------------------- */
.sec-contact {
  background: var(--ink);
  color: var(--paper);
  border-top: 0;
  position: relative;
  overflow: hidden;
}
.sec-contact::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(185,70,40,0.18), transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(160,133,80,0.10), transparent 50%);
  pointer-events: none;
}

.contact-inner { position: relative; }
.contact-card {
  background: rgba(244,239,230,0.04);
  border: 1px solid rgba(244,239,230,0.12);
  border-radius: var(--radius-lg);
  padding: clamp(36px, 6vw, 64px);
  max-width: 920px;
  margin: 0 auto;
}
.sec-contact .sec-eyebrow { color: rgba(244,239,230,0.55); }
.sec-contact .sec-eyebrow span { color: #e2876c; }

.contact-title {
  font-family: var(--font-zh-display);
  font-size: var(--fs-h1);
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.15;
  margin: 0 0 18px;
  color: var(--paper);
}
.contact-title em {
  font-style: italic;
  font-family: var(--font-en-display);
  font-weight: 400;
  color: #d97550;
}
.contact-lead {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: rgba(244,239,230,0.7);
  margin: 0 0 40px;
  max-width: 760px;
}
.contact-lead strong { color: var(--paper); font-weight: 600; }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 36px;
  padding-top: 28px;
  border-top: 1px solid rgba(244,239,230,0.12);
}
.contact-block {
  padding: 24px 0;
}
.contact-block h4 {
  font-family: var(--font-zh-display);
  font-size: 1.25rem;
  font-weight: 500;
  margin: 0 0 10px;
  color: var(--paper);
}
.contact-block p {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgba(244,239,230,0.65);
  margin: 0 0 14px;
}
.contact-block ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.contact-block ul li {
  position: relative;
  padding: 6px 0 6px 16px;
  font-size: 0.875rem;
  color: rgba(244,239,230,0.78);
}
.contact-block ul li::before {
  content: "·";
  position: absolute;
  left: 0;
  top: 5px;
  color: #d97550;
  font-size: 1.4rem;
  line-height: 1;
}

.contact-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  padding-top: 28px;
  border-top: 1px solid rgba(244,239,230,0.12);
}
.contact-cta .btn-primary {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--paper);
}
.contact-cta .btn-primary:hover { background: #d97550; color: var(--paper); border-color: #d97550; }
.contact-cta .btn-ghost {
  color: var(--paper);
  border-color: rgba(244,239,230,0.3);
}
.contact-cta .btn-ghost:hover { border-color: var(--paper); }
.contact-or {
  font-family: var(--font-en-display);
  font-style: italic;
  color: rgba(244,239,230,0.5);
  font-size: 0.875rem;
}

/* ----- 13. FOOTER ----------------------------------------------- */
.footer {
  background: #0a0806;
  color: rgba(244,239,230,0.55);
  padding: 32px 0;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 0.8125rem;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--paper);
}
.footer-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.footer-line {
  color: var(--accent);
  letter-spacing: 0.05em;
}

/* ----- 14. AI ASSISTANT ----------------------------------------- */
.fab {
  position: fixed;
  right: clamp(16px, 3vw, 28px);
  bottom: clamp(16px, 3vw, 28px);
  z-index: 200;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow:
    0 8px 24px -4px rgba(20,16,11,0.32),
    0 0 0 6px rgba(185,70,40,0);
  transition: transform var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease), background var(--t-base) var(--ease);
}
.fab:hover {
  transform: scale(1.06);
  box-shadow:
    0 12px 28px -4px rgba(20,16,11,0.4),
    0 0 0 8px rgba(185,70,40,0.08);
}
.fab.is-open { background: var(--accent-2); border-color: var(--accent-2); }
.fab-core { display: inline-flex; }

.fab-pulse {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--ink);
  opacity: 0;
  pointer-events: none;
}
.fab-pulse::after {
  content: "";
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 1.5px solid var(--accent);
  opacity: 0.6;
  animation: fab-ping 2.6s ease-out infinite;
}
@keyframes fab-ping {
  0% { transform: scale(0.85); opacity: 0.7; }
  80% { transform: scale(1.4); opacity: 0; }
  100% { transform: scale(1.4); opacity: 0; }
}

/* assistant panel */
.assistant {
  position: fixed;
  right: clamp(16px, 3vw, 28px);
  bottom: calc(60px + clamp(16px, 3vw, 28px) + 12px);
  z-index: 199;
  width: 380px;
  max-width: calc(100vw - 32px);
  height: 560px;
  max-height: calc(100vh - 140px);
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  box-shadow:
    0 24px 48px -8px rgba(20,16,11,0.18),
    0 0 0 1px rgba(20,16,11,0.04);
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateY(12px) scale(0.98);
  pointer-events: none;
  transition: opacity var(--t-base) var(--ease), transform var(--t-base) var(--ease);
  overflow: hidden;
}
.assistant.is-open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.assistant-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--paper-2), var(--paper));
}
.assistant-head-l {
  display: flex;
  align-items: center;
  gap: 12px;
}
.assistant-mark {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  display: flex;
  align-items: center;
  justify-content: center;
}
.assistant-head-t {
  display: flex;
  flex-direction: column;
}
.assistant-head-t strong {
  font-family: var(--font-zh-display);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink);
}
.assistant-head-t em {
  font-family: var(--font-en-display);
  font-style: italic;
  font-size: 0.7rem;
  color: var(--ink-4);
  letter-spacing: 0.08em;
}
.assistant-close {
  width: 32px; height: 32px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-3);
  transition: background var(--t-base) var(--ease), color var(--t-base) var(--ease);
}
.assistant-close:hover { background: rgba(20,16,11,0.06); color: var(--ink); }

.assistant-body {
  flex: 1;
  overflow-y: auto;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.assistant-body::-webkit-scrollbar { width: 6px; }
.assistant-body::-webkit-scrollbar-track { background: transparent; }
.assistant-body::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 3px; }

.msg { max-width: 88%; }
.msg-bot { align-self: flex-start; }
.msg-user { align-self: flex-end; }
.msg p {
  font-size: 0.875rem;
  line-height: 1.7;
  margin: 0 0 8px;
  color: var(--ink-2);
}
.msg p:last-child { margin-bottom: 0; }
.msg p code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--paper-2);
  padding: 1px 5px;
  border-radius: 3px;
  color: var(--accent-2);
}
.msg p a { color: var(--accent); text-decoration: underline; }

.msg-bot > p, .msg-bot > h1, .msg-bot > h2, .msg-bot > h3,
.msg-bot > h4, .msg-bot > ul, .msg-bot > ol, .msg-bot > pre, .msg-bot > blockquote {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 14px 14px 14px 4px;
  padding: 10px 14px;
  margin: 0 0 8px;
}
.msg-bot > p:last-child { margin-bottom: 0; }
.msg-bot pre {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  white-space: pre-wrap;
  word-break: break-word;
  background: var(--ink) !important;
  color: var(--paper);
  border-color: var(--ink);
}
.msg-bot pre code { background: transparent; color: inherit; padding: 0; }
.msg-bot ul, .msg-bot ol { padding-left: 30px; }
.msg-bot ul li, .msg-bot ol li { margin: 3px 0; }
.msg-bot h1, .msg-bot h2, .msg-bot h3, .msg-bot h4 {
  font-family: var(--font-zh-display);
  font-weight: 500;
  font-size: 0.95rem;
}
.msg-bot blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 12px;
  color: var(--ink-3);
  font-style: italic;
}

.msg-user > p {
  background: var(--ink);
  color: var(--paper);
  border-radius: 14px 14px 4px 14px;
  padding: 10px 14px;
  margin: 0;
}

.msg-suggest {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}
.msg-suggest button {
  font-size: 0.75rem;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink-2);
  border: 1px solid var(--line-strong);
  transition: background var(--t-base) var(--ease), color var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
}
.msg-suggest button:hover {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.typing {
  display: inline-flex;
  gap: 4px;
  align-items: center;
  padding: 14px 16px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 14px 14px 14px 4px;
}
.typing i {
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink-4);
  animation: blink 1.4s ease-in-out infinite;
}
.typing i:nth-child(2) { animation-delay: 0.18s; }
.typing i:nth-child(3) { animation-delay: 0.36s; }
@keyframes blink {
  0%, 60%, 100% { opacity: 0.3; transform: translateY(0); }
  30% { opacity: 1; transform: translateY(-2px); }
}

.assistant-form {
  display: flex;
  gap: 10px;
  padding: 12px 14px 14px;
  border-top: 1px solid var(--line);
  background: var(--paper);
  align-items: flex-end;
}
.assistant-form textarea {
  flex: 1;
  resize: none;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  padding: 10px 14px;
  font-size: 0.9375rem;
  line-height: 1.5;
  background: var(--paper);
  outline: none;
  max-height: 120px;
  font-family: var(--font-zh-body);
  transition: border-color var(--t-base) var(--ease);
}
.assistant-form textarea:focus { border-color: var(--ink); }
.assistant-form button {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--t-base) var(--ease), transform var(--t-fast) var(--ease);
  flex-shrink: 0;
}
.assistant-form button:hover:not(:disabled) { background: var(--accent-2); }
.assistant-form button:disabled { background: var(--ink-3); cursor: not-allowed; }

/* ----- 15. Reveal 动效 ------------------------------------------ */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 720ms var(--ease), transform 720ms var(--ease);
  will-change: opacity, transform;
}
.reveal.is-in {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

/* ----- 16. 响应式 ----------------------------------------------- */
@media (max-width: 1024px) {
  .pipeline { grid-template-columns: repeat(5, 1fr); }
  .pipeline li:nth-child(5) { border-left: 0; }
  .pipeline li:nth-child(n+6) { border-top: 1px solid var(--line-2); }
  .method-stages { grid-template-columns: 1fr; }
  .stage { padding: 32px 0; border-left: 0; border-top: 1px solid var(--line); }
  .stage:first-child { border-top: 0; }
  .stage-mark { position: static; transform: none; margin-bottom: 14px; }
  .workers { grid-template-columns: 1fr; }
  .worker { border-left: 0; border-top: 1px solid var(--line); }
  .worker:first-child { border-top: 0; }
  .narr-principles { grid-template-columns: 1fr; }
  .principle { border-left: 0; border-top: 1px solid var(--line); padding: 18px 0; }
  .principle:first-child { border-top: 0; }
  .loop-grid { grid-template-columns: 1fr; }
  .loop-detail { grid-template-columns: 1fr; }
  .scn-grid { grid-template-columns: repeat(2, 1fr); }
  .case-summary { grid-template-columns: 1fr; }
  .case-summary-row { border-left: 0; border-top: 1px solid var(--line); padding: 20px 0; }
  .case-summary-row:first-child { border-top: 0; }
  .contact-grid { grid-template-columns: 1fr; }
  .hero-tickers { max-width: 100%; }
}

@media (max-width: 720px) {
  :root {
    --pad-section-y: 84px;
  }
  .nav-links { display: none; }
  .nav-burger { display: inline-flex; }
  .nav-links.is-open {
    display: flex;
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 12px var(--gutter) 18px;
    gap: 6px;
  }
  .nav-links.is-open a { padding: 12px 6px; font-size: 1rem; border-bottom: 1px solid var(--line-2); border-radius: 0; }
  .nav-links.is-open a:last-child { border-bottom: 0; }
  .nav-links.is-open .nav-cta { margin: 8px 0 0; text-align: center; }

  .hero { padding-top: 64px; padding-bottom: 64px; }
  .hero-tickers { grid-template-columns: repeat(2, 1fr); gap: 18px; border: 0; padding: 16px 0; }
  .ticker { border-left: 0; padding: 0; }
  .ticker:nth-child(odd) { border-right: 1px solid var(--line-2); padding-right: 18px; }
  .hero-scroll { display: none; }

  .pipeline { grid-template-columns: repeat(2, 1fr); }
  .pipeline li { border-top: 1px solid var(--line-2); }
  .pipeline li:nth-child(odd) { border-left: 0; }

  .narr-steps li { grid-template-columns: 56px 1fr; gap: 18px; }

  .loop-viz { max-width: 320px; }

  .case-item { grid-template-columns: 44px 1fr; gap: 18px; padding: 24px 0; }
  .case-marker { width: 44px; height: 44px; }

  .scn-controls { gap: 12px; }
  .scn-meta { width: 100%; justify-content: space-between; }

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

  .contact-card { padding: 32px 22px; }
  .contact-cta { flex-direction: column; align-items: flex-start; }
  .contact-cta .btn { width: 100%; justify-content: center; }
  .contact-or { display: none; }
}

@media (max-width: 420px) {
  .assistant { right: 8px; left: 8px; width: auto; }
  .fab { right: 12px; bottom: 12px; width: 54px; height: 54px; }
  .scn-grid { grid-template-columns: 1fr; }
}