/* =========================================================================
   PONTE v2 — 电影级单页 · 五幕咨询档案
   设计取向（刻意去「AI 模板感」）：编辑式档案气质 = 衬线大标题(顾问在说话)
   压住等宽小字(法律号=证据)、暴力尺度对比、硬边纸面、留白挂边、只留一处玻璃。
   动效底座：GSAP + ScrollSmoother + ScrollTrigger + Flip/Draggable/SplitText；
   背景氛围：Three.js WebGL（webgl.js）。颗粒/光标/桥拱是品牌签名。
   ========================================================================= */

:root {
  --paper: #0a0f0c;        /* 纸面：近黑的丛林绿 */
  --paper-2: #0e1612;      /* 次层 */
  --ink: #ece6d8;          /* 骨白正文 */
  --ink-dim: #9aa79c;      /* 次级（带绿调） */
  --ink-faint: #5d6a60;
  --gold: #e8b53f;         /* 财税 / 强调 */
  --azul: #2f6df0;         /* 公司·外资 */
  --green: #16a06a;        /* 劳动 / 在线 */
  --terra: #d2693f;        /* 合规 */
  --line: rgba(236, 230, 216, 0.14);     /* 发丝线 */
  --line-soft: rgba(236, 230, 216, 0.07);

  --glass: rgba(20, 30, 24, 0.55);
  --glass-stroke: rgba(236, 230, 216, 0.16);

  --serif: "Noto Serif SC", "Fraunces", Georgia, serif;
  --serif-lat: "Fraunces", "Noto Serif SC", Georgia, serif;
  --mono: "Space Mono", ui-monospace, "JetBrains Mono", monospace;
  --sans: "Noto Sans SC", system-ui, sans-serif;

  --r: 3px;                /* 硬边：容器统一极小圆角，告别糖果胶囊 */
  --maxw: 1280px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.75;
  overflow-x: hidden;
  font-weight: 300;
}
/* WebGL 失败时的兜底底色，保证永远不是纯黑空场 */
body { background-image: radial-gradient(120% 80% at 70% 0%, #0e1a14 0%, var(--paper) 55%); }

a { color: inherit; text-decoration: none; }
.mono { font-family: var(--mono); letter-spacing: 0.02em; }
.hl { color: var(--gold); }
em { font-style: normal; color: var(--gold); }
::selection { background: var(--gold); color: var(--paper); }

img, svg { display: block; }

::-webkit-scrollbar { width: 0; height: 0; }   /* ScrollSmoother 接管，隐藏原生条 */

/* ================= 固定层：WebGL / 颗粒 / 光标 ================= */
#gl { position: fixed; inset: 0; width: 100%; height: 100%; z-index: 0; pointer-events: none; }

.grain {
  position: fixed; inset: -50%; width: 200%; height: 200%; z-index: 60; pointer-events: none;
  opacity: 0.05; mix-blend-mode: soft-light;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain 0.5s steps(3) infinite;
}
@keyframes grain { 0%{transform:translate(0,0)} 33%{transform:translate(-3%,2%)} 66%{transform:translate(2%,-2%)} 100%{transform:translate(0,0)} }

/* 自定义光标：一道微缩桥拱，悬停可交互元素时张开 */
/* 自定义光标已移除：恢复系统默认指针（避免视觉偏移导致难以瞄准点击）。 */

/* ================= 导航 ================= */
.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 70; display: flex; align-items: center; justify-content: space-between; padding: 22px clamp(20px, 5vw, 54px); transition: padding 0.4s var(--ease), background 0.4s; }
.nav.is-scrolled { padding-top: 14px; padding-bottom: 14px; background: linear-gradient(180deg, rgba(10,15,12,0.82), transparent); backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); }
.nav__brand { display: flex; align-items: center; gap: 11px; color: var(--ink); }
.nav__arc { color: var(--gold); }
.nav__word { font-family: var(--serif-lat); font-weight: 900; letter-spacing: 0.18em; font-size: 1.1rem; }
.nav__menu { display: flex; align-items: center; gap: clamp(16px, 2.6vw, 34px); font-size: 0.9rem; }
.nav__menu a { color: var(--ink-dim); transition: color 0.25s; position: relative; }
.nav__menu a .mono { font-size: 0.7rem; color: var(--ink-faint); margin-right: 3px; }
.nav__menu a:hover, .nav__menu a.is-current { color: var(--ink); }
.nav__menu a.is-current .mono { color: var(--gold); }
/* .nav__cta 视觉沿用统一按钮系统（见「按钮」区）；这里只补悬停描金 */
.nav__cta:hover { border-color: var(--gold); color: var(--gold); }
.nav__burger { display: none; flex-direction: column; gap: 6px; width: 30px; background: none; border: none; cursor: pointer; }
.nav__burger span { height: 2px; width: 100%; background: var(--ink); transition: transform 0.35s var(--ease), opacity 0.25s; }
.nav.is-open .nav__burger span:nth-child(1) { transform: translateY(4px) rotate(45deg); }
.nav.is-open .nav__burger span:nth-child(2) { transform: translateY(-4px) rotate(-45deg); }

/* 右侧幕导航 */
.rail { position: fixed; right: 26px; top: 50%; transform: translateY(-50%); z-index: 65; display: flex; flex-direction: column; gap: 16px; }
.rail__dot { background: none; border: none; cursor: pointer; color: var(--ink-faint); font-size: 0.68rem; padding: 2px; position: relative; transition: color 0.3s; }
.rail__dot::before { content: ""; position: absolute; right: 100%; top: 50%; margin-right: 8px; width: 14px; height: 1px; background: var(--ink-faint); transform: scaleX(0.4); transform-origin: right; transition: transform 0.3s, background 0.3s; }
.rail__dot.is-current { color: var(--gold); }
.rail__dot.is-current::before { background: var(--gold); transform: scaleX(1); }

/* ================= 按钮（全站统一）=================
   统一：等宽字体、硬边、同一套悬浮手感——hover 时轻微上浮 + 阴影加深（不再有磁吸晃动）。 */
.btn, .nav__cta, .assistant__back, .assistant__theme {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--mono); font-size: 0.86rem; letter-spacing: 0.04em; line-height: 1;
  padding: 13px 24px; border-radius: var(--r); border: 1px solid var(--line);
  background: transparent; color: var(--ink); cursor: pointer;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), background 0.3s, color 0.3s, border-color 0.3s;
  will-change: transform;
}
/* 统一悬浮感：稍微浮起 */
.btn:hover, .nav__cta:hover, .assistant__back:hover, .assistant__theme:hover { transform: translateY(-3px); }
.btn:active, .nav__cta:active, .assistant__back:active, .assistant__theme:active { transform: translateY(-1px); }

.btn--solid { background: var(--gold); border-color: var(--gold); color: var(--paper); font-weight: 700; }
.btn--solid:hover { background: var(--gold); box-shadow: 0 14px 30px -10px var(--gold); }
.btn--line { background: transparent; border-color: var(--line); color: var(--ink); }
.btn--line:hover { border-color: var(--gold); color: var(--gold); }
.btn--block { width: 100%; }
.btn--lg { padding: 18px 40px; font-size: 1rem; }
.btn--lg.btn--solid { box-shadow: 0 16px 40px -16px var(--gold); }
/* 导航 CTA 与返回键沿用统一手感，仅尺寸略小 */
.nav__cta { padding: 9px 18px; font-size: 0.82rem; }
.assistant__back { padding: 9px 16px; font-size: 0.8rem; }

/* ================= 通用 act 骨架 ================= */
.act { position: relative; z-index: 1; padding: clamp(60px, 8vh, 110px) clamp(20px, 6vw, 80px); max-width: var(--maxw); margin: 0 auto; }
.act__head { max-width: 760px; margin-bottom: clamp(40px, 7vw, 80px); }
.act__no { display: block; color: var(--gold); font-size: 0.82rem; letter-spacing: 0.2em; margin-bottom: 18px; }
.act__title { font-family: var(--serif); font-weight: 900; font-size: clamp(2.1rem, 6vw, 4.4rem); line-height: 1.08; letter-spacing: -0.01em; }
.act__sub { font-size: 0.82rem; color: var(--ink-dim); margin-top: 18px; letter-spacing: 0.12em; }
.act__head .act__sub:not(.mono) { font-family: var(--sans); max-width: 560px; line-height: 1.7; letter-spacing: 0; }

/* ===================== ACT 1 · HERO ===================== */
.hero { min-height: 100svh; display: flex; flex-direction: column; justify-content: center; max-width: none; padding-left: clamp(20px, 8vw, 130px); padding-right: clamp(20px, 6vw, 80px); }
.hero__grid { max-width: 1000px; position: relative; }
.hero__eyebrow { color: var(--green); letter-spacing: 0.28em; font-size: 0.76rem; margin-bottom: 26px; }
.hero__title { font-family: var(--serif); font-weight: 900; font-size: clamp(2.6rem, 8.5vw, 6.4rem); line-height: 1.02; letter-spacing: -0.015em; }
.hero__title .l { display: block; position: relative; }
.hero__title .idx { position: absolute; left: -2.6em; top: 0.4em; font-size: 0.16em; color: var(--ink-faint); letter-spacing: 0.1em; }
.hero__title .hl { font-family: var(--serif-lat); font-style: italic; }
.hero__title .char { display: inline-block; will-change: transform; }

.hero__bridge { width: min(560px, 70%); height: auto; color: var(--ink-faint); margin: 30px 0 34px; overflow: visible; }
.hero__bridge .bridgeNode { fill: var(--gold); }
.hero__bridge .bridgeLbl { fill: var(--ink-dim); font-family: var(--mono); font-size: 13px; }

.hero__lead { font-size: clamp(1rem, 1.5vw, 1.18rem); color: var(--ink-dim); max-width: 540px; }
.hero__foot { display: flex; align-items: flex-end; justify-content: space-between; gap: 30px; flex-wrap: wrap; margin-top: 42px; }
.hero__actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero__fact { font-size: 0.78rem; color: var(--ink-faint); }
.hero__fact em { color: var(--gold); }
.hero__scroll { position: absolute; bottom: 30px; right: clamp(20px, 6vw, 80px); font-size: 0.7rem; color: var(--ink-dim); letter-spacing: 0.2em; animation: bob 2s infinite; }
@keyframes bob { 0%,100%{transform:translateY(0);opacity:0.5} 50%{transform:translateY(6px);opacity:1} }

/* ===================== ACT 2 · CAPS ===================== */
.caps__stack { display: grid; grid-template-columns: repeat(6, 1fr); gap: 22px; }
.cap { border: 1px solid var(--line); border-radius: var(--r); padding: clamp(26px, 3vw, 44px); background: linear-gradient(180deg, rgba(236,230,216,0.025), transparent); position: relative; overflow: hidden; will-change: transform, opacity; }
.cap__no { position: absolute; top: 10px; right: 18px; font-size: 5.5rem; font-weight: 700; color: rgba(236,230,216,0.05); line-height: 1; }
.cap h3 { font-family: var(--serif); font-weight: 600; font-size: clamp(1.3rem, 2.2vw, 1.9rem); margin-bottom: 16px; line-height: 1.25; }
.cap p { color: var(--ink-dim); font-size: 0.96rem; max-width: 46ch; }
.cap__tags { list-style: none; display: flex; flex-wrap: wrap; gap: 7px; margin-top: 22px; }
.cap__tags li { font-size: 0.68rem; color: var(--ink-dim); border: 1px solid var(--line); border-radius: var(--r); padding: 4px 11px; }
/* 五张等样式卡：6 列网格，上排 3 张各占 2 列、下排 2 张各占 3 列，铺满不留空；标题尺寸统一（不再有大卡） */
.cap--lead, .cap--b, .cap--c { grid-column: span 2; }
.cap--d, .cap--e { grid-column: span 3; }

/* ===================== ACT 3 · SHELF ===================== */
.shelf { max-width: none; padding: clamp(60px, 8vh, 110px) 0; overflow: hidden; }
/* §03 两栏：左 3D 旋转书架，右介绍文案 */
.shelf__inner { max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(20px, 6vw, 80px); display: grid; grid-template-columns: 1.15fr 0.85fr; gap: clamp(30px, 4vw, 64px); align-items: center; }
.shelf__intro { display: flex; flex-direction: column; }
.shelf__desc { color: var(--ink-dim); font-size: 0.98rem; line-height: 1.75; max-width: 44ch; margin: 20px 0; }
.shelf__legend { list-style: none; display: flex; flex-direction: column; gap: 9px; font-size: 0.74rem; margin-top: 6px; }
.shelf__legend li { display: flex; align-items: center; gap: 9px; color: var(--ink-dim); }
.shelf__legend .sw { width: 13px; height: 13px; border-radius: 2px; }

/* 3D 圆柱舞台：perspective 在此建立；注意祖先链不能有 backdrop-filter（会拍平 3D） */
.shelf__stage { position: relative; height: 580px; margin: 0; overflow: hidden; perspective: 1950px; perspective-origin: 50% 42%; }
.shelf__cylinder { position: absolute; left: 50%; top: 50%; width: 0; height: 0; transform-style: preserve-3d; will-change: transform; }
.shelf__floor { position: absolute; left: 50%; bottom: 64px; width: 940px; height: 240px; transform: translateX(-50%) rotateX(78deg); background: radial-gradient(ellipse at center, rgba(232,181,63,0.08), transparent 62%); pointer-events: none; }

/* 书脊：一根可读的色编书脊（竖排法律号 + 中文标题） */
.spine { position: absolute; left: 0; top: 0; width: 80px; height: 400px; margin: -200px 0 0 -40px; transform-style: preserve-3d; cursor: grab; }
.spine__face { position: absolute; inset: 0; border-radius: 2px; background: linear-gradient(100deg, #16201a, #0d140f); border: 1px solid rgba(0,0,0,0.5); box-shadow: inset 0 0 0 1px rgba(236,230,216,0.04), 0 22px 48px -16px rgba(0,0,0,0.8); display: flex; flex-direction: column; align-items: center; padding: 18px 8px; overflow: hidden; transition: transform 0.4s var(--ease); }
.spine__band { width: 100%; height: 9px; border-radius: 2px; flex: none; box-shadow: 0 0 14px -2px currentColor; }
.spine__no { writing-mode: vertical-rl; font-family: var(--mono); font-size: 0.84rem; letter-spacing: 0.04em; color: var(--ink); margin-top: 18px; white-space: nowrap; }
.spine__title { writing-mode: vertical-rl; font-family: var(--serif); font-size: 0.94rem; color: var(--ink-dim); margin-top: 12px; max-height: 240px; overflow: hidden; }
.spine__foot { writing-mode: vertical-rl; font-family: var(--mono); font-size: 0.64rem; color: var(--ink-faint); margin-top: auto; }
/* 官方一手法规：上下烫金线 + 内嵌高光 */
.spine--foil .spine__face { box-shadow: inset 0 0 0 1px rgba(232,181,63,0.22), inset 0 26px 30px -28px var(--gold), 0 18px 40px -16px rgba(0,0,0,0.85); }
.spine--foil .spine__face::after { content: ""; position: absolute; left: 8px; right: 8px; bottom: 12px; height: 1px; background: linear-gradient(90deg, transparent, var(--gold), transparent); opacity: 0.5; }
/* 时效徽标 */
.spine__dot { position: absolute; bottom: 10px; left: 50%; transform: translateX(-50%); width: 6px; height: 6px; border-radius: 50%; }
.spine:hover .spine__face { transform: translateZ(30px); }

.shelf__readout { min-height: 48px; display: flex; align-items: baseline; gap: 16px; border-top: 1px solid var(--line); padding-top: 18px; }
.shelf__readout .ro-no { font-family: var(--mono); color: var(--gold); font-size: 0.9rem; }
.shelf__readout .ro-title { font-family: var(--serif); font-size: 1.1rem; }
.shelf__readout .ro-cat { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-dim); margin-left: auto; }

/* reduced-motion / 无 3D 兜底：横向滚动的静态书脊条 */
.shelf.no-3d .shelf__stage { perspective: none; height: auto; overflow-x: auto; }
.shelf.no-3d .shelf__cylinder { position: static; transform: none !important; display: flex; gap: 10px; width: auto; height: auto; padding: 10px 0; }
.shelf.no-3d .spine { position: relative; margin: 0; transform: none !important; flex: none; }

/* 详情卡（Flip 飞出） */
.doc-detail { position: fixed; inset: 0; z-index: 75; display: flex; align-items: center; justify-content: center; padding: 24px; }
/* 关键：作者写的 display:flex 会盖过 [hidden] 的 display:none，导致这个全屏遮罩始终存在、
   以 opacity:0 隐形却仍吃掉全站指针事件（书架点不动、页面像「操控不了」）。提高特异性让 hidden 生效。 */
.doc-detail[hidden] { display: none; }
.doc-detail::before { content: ""; position: absolute; inset: 0; background: rgba(6,10,8,0.6); backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); }
.doc-detail__card { position: relative; width: min(440px, 92vw); padding: 38px 34px; border-radius: var(--r); background: var(--glass); border: 1px solid var(--glass-stroke); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); }
.doc-detail__close { position: absolute; top: 14px; right: 16px; background: none; border: none; color: var(--ink-dim); font-size: 1rem; cursor: pointer; }
.doc-detail__cat { font-size: 0.72rem; letter-spacing: 0.1em; }
.doc-detail__no { font-size: 1rem; color: var(--gold); margin: 14px 0 6px; }
.doc-detail__title { font-family: var(--serif); font-weight: 600; font-size: 1.5rem; line-height: 1.3; margin-bottom: 14px; }
.doc-detail__desc { color: var(--ink-dim); font-size: 0.95rem; }
.doc-detail__meta { margin: 22px 0; padding: 16px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); display: grid; grid-template-columns: auto 1fr; gap: 8px 18px; font-size: 0.78rem; }
.doc-detail__meta dt { color: var(--ink-faint); }
.doc-detail__meta dd { color: var(--ink); text-align: right; }
.doc-detail__src { display: inline-block; font-family: var(--mono); font-size: 0.8rem; color: var(--gold); border-bottom: 1px solid var(--gold); padding-bottom: 2px; }

/* ===================== ACT 4 · CONSULT ===================== */
.consult { max-width: none; display: grid; place-items: center; padding-bottom: clamp(90px, 14vh, 180px); }
.consult__depth { position: absolute; inset: 0; overflow: hidden; pointer-events: none; z-index: 0; }
.consult__curve { width: 100%; height: 100%; }
.consult__curve path { stroke: var(--green); stroke-width: 1.2; opacity: 0.25; }
.consult .act__head { text-align: center; max-width: 700px; margin: 0 auto clamp(34px, 5vw, 60px); position: relative; z-index: 1; }
.consult .act__head--consult .act__title { font-size: clamp(2.4rem, 6vw, 4.6rem); }

/* 问诊室：全站唯一的玻璃，压在运动的远景上才显真 */
.glass { background: var(--glass); border: 1px solid var(--glass-stroke); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-radius: var(--r); }
.room { position: relative; z-index: 1; width: min(780px, 100%); overflow: hidden; box-shadow: 0 40px 100px -40px rgba(0,0,0,0.8); }
.room__bar { display: flex; align-items: center; gap: 14px; padding: 18px 24px; border-bottom: 1px solid var(--line); }
.room__avatar { width: 42px; height: 42px; border-radius: 50%; display: flex; align-items: center; justify-content: center; background: rgba(22,160,106,0.14); color: var(--green); border: 1px solid var(--line); }
.room__id strong { font-family: var(--serif); font-size: 1rem; }
.room__status { display: flex; align-items: center; gap: 6px; font-size: 0.72rem; color: var(--ink-dim); }
.room__status i { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 8px var(--green); }
.room__tag { margin-left: auto; font-size: 0.68rem; color: var(--gold); border: 1px solid rgba(232,181,63,0.35); border-radius: var(--r); padding: 3px 11px; }
.room__log { padding: 26px; min-height: 240px; max-height: 440px; overflow-y: auto; display: flex; flex-direction: column; gap: 14px; }
.msg { max-width: 84%; font-size: 0.95rem; line-height: 1.7; padding: 14px 18px; border-radius: var(--r); opacity: 0; }
.msg--user { align-self: flex-end; background: rgba(22,160,106,0.16); border: 1px solid rgba(22,160,106,0.3); }
.msg--ai { align-self: flex-start; background: rgba(236,230,216,0.045); border: 1px solid var(--line); }
.msg__cite { display: block; margin-top: 11px; padding-top: 11px; border-top: 1px dashed rgba(232,181,63,0.35); font-family: var(--mono); font-size: 0.76rem; color: var(--gold); }
.msg__cite a { text-decoration: underline; text-underline-offset: 2px; }
.msg--typing { display: flex; gap: 6px; }
.msg--typing span { width: 8px; height: 8px; border-radius: 50%; background: var(--ink-dim); animation: blink 1.2s infinite; }
.msg--typing span:nth-child(2){animation-delay:.18s} .msg--typing span:nth-child(3){animation-delay:.36s}
@keyframes blink { 0%,80%,100%{opacity:.25;transform:translateY(0)} 40%{opacity:1;transform:translateY(-3px)} }
.room__suggest { display: flex; gap: 9px; flex-wrap: wrap; padding: 0 24px 16px; }
.suggest { font-family: var(--sans); font-size: 0.78rem; cursor: pointer; color: var(--ink-dim); background: transparent; border: 1px solid var(--line); border-radius: 100px; padding: 8px 14px; transition: background 0.25s, border-color 0.25s, color 0.25s; }   /* font-family 显式声明：盖过 HTML 上的 .mono 类 */
.suggest:hover { background: rgba(128,128,128,0.08); border-color: var(--ink-dim); color: var(--ink); }
.suggest:disabled { opacity: 0.4; cursor: default; }
.room__input { display: flex; gap: 10px; padding: 15px 20px; border-top: 1px solid var(--line); }
.room__input input { flex: 1; background: rgba(236,230,216,0.04); border: 1px solid var(--line); border-radius: var(--r); padding: 12px 18px; color: var(--ink); font-family: var(--sans); font-size: 0.92rem; outline: none; transition: border-color 0.3s; }
.room__input input:focus { border-color: var(--green); }
.room__input button { width: 46px; height: 46px; flex: none; border: none; border-radius: var(--r); cursor: pointer; background: var(--gold); color: var(--paper); display: flex; align-items: center; justify-content: center; transition: background 0.3s; }
.room__input button:hover { background: var(--ink); }

/* ===================== ACT 5 · CONTACT ===================== */
.contact { max-width: none; padding-top: 0; }
.marquee { overflow: hidden; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 16px 0; margin-bottom: clamp(60px, 9vw, 110px); }
.marquee__track { display: inline-flex; gap: 40px; white-space: nowrap; font-size: 0.82rem; color: var(--ink-faint); will-change: transform; }
.marquee__track span em { color: var(--gold); font-style: normal; }
.contact__inner { max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(20px, 6vw, 80px); display: grid; grid-template-columns: 1fr 1fr; gap: clamp(40px, 6vw, 90px); align-items: start; }
.contact .act__head { margin-bottom: 0; }
.lead { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field--full { grid-column: 1 / -1; }
.field label { font-size: 0.74rem; color: var(--ink-dim); letter-spacing: 0.06em; }
.field input { background: rgba(236,230,216,0.035); border: 1px solid var(--line); border-radius: var(--r); padding: 14px 16px; color: var(--ink); font-family: var(--sans); font-size: 0.95rem; outline: none; transition: border-color 0.3s, background 0.3s; }
.field input:focus { border-color: var(--gold); background: rgba(236,230,216,0.06); }
.field input.is-error { border-color: var(--terra); }
.field__err { color: var(--terra); font-size: 0.72rem; min-height: 1em; }
.lead .btn { grid-column: 1 / -1; }
.lead__note { grid-column: 1 / -1; text-align: center; font-size: 0.84rem; min-height: 1.2em; color: var(--ink-dim); }
.lead__note.is-ok { color: var(--green); }

.footer { max-width: var(--maxw); margin: clamp(70px, 10vw, 130px) auto 0; padding: 44px clamp(20px, 6vw, 80px); border-top: 1px solid var(--line); display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; flex-wrap: wrap; }
.footer__brand .nav__word { font-size: 1.3rem; display: block; margin-bottom: 10px; }
.footer__brand p { color: var(--ink-faint); font-size: 0.74rem; max-width: 460px; }
.footer__copy { color: var(--ink-faint); font-size: 0.72rem; }

/* ===================== ACT 4 · AI 顾问介绍（终幕）=====================
   与其他幕一致：标题左对齐；一键开始按钮放右侧；图案已删除。 */
.intro { max-width: none; min-height: 100svh; display: flex; flex-direction: column; justify-content: center; padding-top: clamp(70px, 10vh, 130px); padding-bottom: clamp(50px, 7vh, 90px); }
.intro__inner { max-width: var(--maxw); width: 100%; margin: 0 auto; padding: 0 clamp(20px,6vw,80px); display: grid; grid-template-columns: 1fr auto; align-items: center; gap: clamp(30px,5vw,72px); position: relative; z-index: 1; }
.intro__main { max-width: 680px; }
.intro__lead { margin-top: 22px; display: flex; flex-direction: column; gap: 15px; }
.intro__lead p { color: var(--ink-dim); font-size: 0.98rem; line-height: 1.8; max-width: 600px; }
.intro .act__no { color: var(--green); }
.intro .act__head { margin-bottom: 26px; }
.intro .act__title { font-size: clamp(2.2rem,5.2vw,4.2rem); }
.intro .act__sub { margin-top: 18px; max-width: 600px; }
/* 终幕：真实示例问题（点击深链进助手） */
.intro__ask { margin-top: 26px; display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.intro__ask-lead { font-size: 0.74rem; color: var(--ink-faint); }
.ask-chip { font-family: var(--mono); font-size: 0.8rem; cursor: pointer; color: var(--ink); background: rgba(47,109,240,0.1); border: 1px solid rgba(47,109,240,0.3); border-radius: var(--r); padding: 8px 14px; transition: background .25s, border-color .25s, transform .25s; }
.ask-chip:hover { background: rgba(47,109,240,0.2); border-color: var(--azul); transform: translateY(-2px); }
/* 终幕：CTA 行 + 硬数据带 */
.intro__actions { margin-top: 26px; display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.intro__hint { font-size: 0.72rem; color: var(--ink-faint); }
.intro__proof { margin-top: 24px; display: flex; flex-wrap: wrap; gap: 8px 14px; font-size: 0.76rem; color: var(--ink-dim); }
.intro__proof em { color: var(--gold); font-style: normal; font-weight: 700; }
/* 终幕：产品实景预览卡（复用助手对话视觉，做成一件「展品」） */
.demo { width: min(440px, 42vw); border: 1px solid var(--line); border-radius: 12px; background: rgba(7,12,9,0.82); box-shadow: 0 24px 60px rgba(0,0,0,0.35); padding: 18px 20px 20px; }
.demo__tag { display: flex; align-items: center; gap: 8px; font-size: 0.68rem; letter-spacing: 0.08em; color: var(--green); margin-bottom: 16px; }
.demo__tag i { width: 6px; height: 6px; border-radius: 50%; background: var(--green); box-shadow: 0 0 8px var(--green); }
.demo__chat { display: flex; flex-direction: column; gap: 14px; min-height: 340px; }
.demo .msg--user { font-size: 0.9rem; max-width: 88%; }
.demo .ai-turn { gap: 12px; }
.demo .trace__head { cursor: default; }
.demo .ai-answer p { font-size: 0.92rem; line-height: 1.7; }
.intro .marquee { width: 100%; margin: clamp(40px,6vw,72px) 0 18px; }
.intro__disclaimer { font-size: 0.7rem; color: var(--ink-faint); max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(20px,6vw,80px); line-height: 1.7; }

/* ===================== 全屏「联系我们」=====================
   与全屏助手同款全屏外壳；中间一张表单卡。 */
.contactp { position: fixed; inset: 0; z-index: 95; display: flex; flex-direction: column; background: linear-gradient(180deg, #0b1410, #060b08); }
.contactp[hidden] { display: none; }
.contactp::before { content: ""; position: absolute; inset: 0; background: radial-gradient(120% 80% at 50% -10%, rgba(232,181,63,0.12), transparent 55%); pointer-events: none; }
.contactp__body { position: relative; z-index: 1; flex: 1; display: grid; place-items: center; padding: 30px clamp(18px,5vw,40px); overflow-y: auto; }
.contactp__panel { width: min(560px, 100%); }
.contactp__panel .act__no { color: var(--gold); }
.contactp__title { font-family: var(--serif); font-weight: 900; font-size: clamp(1.9rem,4vw,2.8rem); line-height: 1.15; margin: 14px 0 16px; }
.contactp__sub { color: var(--ink-dim); font-size: 0.96rem; margin-bottom: 30px; max-width: 520px; }

/* ===================== 全屏 AI 助手（agentic，去客服感）===================== */
.assistant { position: fixed; inset: 0; z-index: 95; display: flex; flex-direction: column; background: linear-gradient(180deg, #0b1410, #060b08); }
.assistant[hidden] { display: none; }   /* 同 doc-detail 教训：作者 display 会盖过 [hidden]，须显式让 hidden 生效 */
/* 原顶部绿色辉光已移除（2026-07-10）：问答界面收敛为安静的纯色底，风格不再跳脱。 */
/* 顶部去除整条 bar，只留一个悬浮返回键 */
.assistant__back { position: absolute; top: clamp(16px,3vh,26px); left: clamp(16px,4vw,40px); z-index: 3; }
.assistant__back:hover { border-color: var(--gold); color: var(--gold); }

/* 浅色/深色切换键：与返回键同款视觉，镜像挂在右上角。
   深色下显示太阳（点击→浅色），浅色下显示月亮（点击→深色）——图标即「点击后会去哪」。 */
.assistant__theme { position: absolute; top: clamp(16px,3vh,26px); right: clamp(16px,4vw,40px); z-index: 3; padding: 9px 12px; }
.assistant__theme:hover { border-color: var(--gold); color: var(--gold); }
.assistant__theme .i-moon { display: none; }
.assistant.is-light .assistant__theme .i-sun { display: none; }
.assistant.is-light .assistant__theme .i-moon { display: block; }

/* ---------- 浅色模式（仅作用于全屏助手，不影响主页深色叙事）----------
   原理：助手内部所有文字/线条/点缀都走 CSS 变量（--ink/--line/--gold…），
   在 .is-light 上重定义这几个变量即可整体翻转；少数写死 rgba 的底色单独补覆盖。
   金色特意换成更深的赭金：原 #e8b53f 在白底上对比度不够（链接/引用芯片会看不清）。 */
.assistant.is-light {
  --ink: #262a28;                       /* 正文：近黑的中性墨 */
  --ink-dim: #5a625d;
  --ink-faint: #8b948d;
  --line: rgba(28, 34, 30, 0.14);
  --line-soft: rgba(28, 34, 30, 0.07);
  --gold: #a87a12;                      /* 白底可读的深赭金（正文链接用） */
  --paper: #ffffff;                     /* 发送键图标色（color: var(--paper)）随之变白底反色 */
  background: #f7f8f9;                  /* 参考截图：干净的浅暖灰纯色底 */
  color: var(--ink);                    /* 兜底：没显式设色的后代不再继承 body 的骨白 */
}
/* 写死深色 rgba 的几处底色，浅色下换成实色（参考截图的白面板/浅灰气泡） */
.assistant.is-light .msg--user { background: #eceeef; border-color: transparent; }
.assistant.is-light .trace { background: #f0f1f2; border-color: #e8e9ea; }
.assistant.is-light .assistant__input { background: #ffffff; border-color: #e5e6e8; box-shadow: 0 6px 24px rgba(0,0,0,0.06); }
.assistant.is-light .assistant__input input { background: none; }
.assistant.is-light .assistant__input button { background: #2b302d; color: #fff; }

/* 滚动区：居中单列，像现代 AI 助手 */
.assistant__scroll { position: relative; z-index: 1; flex: 1; overflow-y: auto; width: 100%; max-width: 760px; margin: 0 auto; padding: clamp(72px,11vh,120px) 24px 24px; display: flex; flex-direction: column; gap: 30px; }

/* 空状态：居中流式问候 */
.chat-empty { flex: 1; min-height: 46vh; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; }
.chat-empty__title { font-family: var(--sans); font-weight: 500; font-size: clamp(1.5rem,3.2vw,2.1rem); color: var(--ink); line-height: 1.3; }
.chat-empty__title .caret { color: var(--ink-dim); font-weight: 400; animation: caretBlink 1.05s steps(1) infinite; }
@keyframes caretBlink { 0%,50%{opacity:1} 51%,100%{opacity:0} }
.chat-empty__hint { margin-top: 14px; font-family: var(--sans); font-size: 0.8rem; color: var(--ink-faint); }

/* 用户消息：右侧气泡（中性浅灰，参考截图收敛，去金色） */
.msg--user { align-self: flex-end; max-width: 80%; background: rgba(128,128,128,0.11); border: 1px solid var(--line-soft); border-radius: 16px 16px 4px 16px; padding: 12px 17px; font-size: 0.98rem; line-height: 1.7; color: var(--ink); }

/* AI 回合：整列无气泡（像 Claude/ChatGPT） */
.ai-turn { align-self: stretch; display: flex; flex-direction: column; gap: 16px; }

/* 思考 + agent 工作流程 trace
   观感（2026-07-10 参考截图收敛）：从「金色左边线」改成安静的浅灰圆角面板——
   低饱和、低对比，思考过程是背景信息，不该比正文抢眼。 */
.trace { border: 1px solid var(--line-soft); background: rgba(128,128,128,0.06); border-radius: 12px; padding: 10px 14px; }
.trace__head { display: flex; align-items: center; gap: 10px; font-family: var(--sans); font-size: 0.82rem; color: var(--ink-dim); cursor: pointer; user-select: none; }
.trace__spin { width: 13px; height: 13px; flex: none; border: 2px solid var(--line); border-top-color: var(--ink-dim); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.trace__time { margin-left: auto; color: var(--ink-faint); font-variant-numeric: tabular-nums; }
.trace__chev { color: var(--ink-faint); transition: transform 0.3s var(--ease); }
.trace.collapsed .trace__chev { transform: rotate(-90deg); }
.trace.is-done .trace__head { color: var(--ink-dim); }
/* 折叠动画 = grid-rows 技巧（1fr↔0fr 能对「内容固有高度」过渡，各现代浏览器均支持）：
   助手对话的步骤列表包在 .trace__wrap 里，折叠收 wrapper 而非列表本身——
   列表因此不需要 max-height 上限（旧方案 1400px + overflow:hidden，思维链一长就被截断）。
   首页 demo 的 .trace__steps 没有 wrapper 也从不折叠，走基础样式即可，不受影响。 */
.trace__wrap { display: grid; grid-template-rows: 1fr; margin-top: 12px; transition: grid-template-rows 0.35s var(--ease), opacity 0.3s, margin 0.3s; }
.trace.collapsed .trace__wrap { grid-template-rows: 0fr; margin-top: 0; opacity: 0; }
.trace__steps { list-style: none; margin-top: 12px; display: flex; flex-direction: column; gap: 9px; }
/* wrapper 内的列表：间距由 wrapper 承担（列表 margin 会撑破 0fr 轨道，必须归零）；
   overflow + min-height:0 是 0fr 能收拢到零的两个必要条件。
   限高内滚（2026-07-10 用户定稿）：思维链一长就占满整页 → 框最高约半屏（45vh），
   超出部分框内滚动（JS 负责流式时自动跟到最新一行）；全局滚动条被隐藏（line 57），
   这里单独放出一根细条，让「框内还有内容」看得见。 */
.trace__wrap .trace__steps { margin-top: 0; overflow: hidden; overflow-y: auto; min-height: 0; max-height: min(45vh, 440px); scrollbar-width: thin; scrollbar-color: rgba(128,128,128,0.35) transparent; }
.trace__wrap .trace__steps::-webkit-scrollbar { width: 6px; }
.trace__wrap .trace__steps::-webkit-scrollbar-track { background: transparent; }
.trace__wrap .trace__steps::-webkit-scrollbar-thumb { background: rgba(128,128,128,0.3); border-radius: 3px; }
.trace__steps li { display: flex; align-items: center; gap: 11px; font-family: var(--sans); font-size: 0.8rem; color: var(--ink-faint); }
.trace__steps li .step-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--line); flex: none; }
.trace__steps li.is-active { color: var(--ink-dim); }
.trace__steps li.is-active .step-dot { background: var(--ink-dim); animation: pulse 1s infinite; }
@keyframes pulse { 0%,100%{transform:scale(1)} 50%{transform:scale(1.5)} }
.trace__steps li.is-done .step-dot { background: var(--ink-faint); }
/* 思考记录：模型调工具前吐的「思考/开场白」，作为一条非步骤的散文记录显示在思考框里（不带圆点）。 */
.trace__steps li.trace__think { display: block; font-family: inherit; font-size: 0.84rem; line-height: 1.65; color: var(--ink-dim); white-space: pre-wrap; opacity: 0.9; padding-left: 12px; border-left: 2px solid var(--line); margin-left: -2px; }

/* 流式正文 */
.ai-answer p { font-size: 1.02rem; line-height: 1.85; color: var(--ink); white-space: pre-wrap; }
.ai-answer p + p { margin-top: 14px; }
.stream-caret { color: var(--ink-dim); animation: caret-blink 1.05s steps(2, start) infinite; }
@keyframes caret-blink { 50% { opacity: 0; } }

/* markdown 富文本（最终答案：标题/列表/表格/代码/引用/分隔/链接）。颜色全走主题变量；
   灰底用 rgba(128,128,128,…) 在深浅主题下都成立，金色点缀沿用 rgba(232,181,63,…)。 */
.ai-answer h1, .ai-answer h2, .ai-answer h3, .ai-answer h4 { color: var(--ink); line-height: 1.4; margin: 18px 0 8px; font-weight: 600; }
.ai-answer h1 { font-size: 1.18rem; } .ai-answer h2 { font-size: 1.1rem; } .ai-answer h3 { font-size: 1.02rem; } .ai-answer h4 { font-size: 0.96rem; }
.ai-answer ul, .ai-answer ol { margin: 8px 0; padding-left: 1.45em; }
.ai-answer li { font-size: 1rem; line-height: 1.75; color: var(--ink); margin: 3px 0; }
.ai-answer li::marker { color: var(--ink-dim); }
.ai-answer strong { font-weight: 600; color: var(--ink); }
.ai-answer em { font-style: italic; color: inherit; }   /* 盖过全局 em 的金色：正文强调不抢眼 */
.ai-answer a { color: var(--gold); text-decoration: underline; text-underline-offset: 2px; }
.ai-answer code { font-family: var(--mono); font-size: 0.86em; background: rgba(128,128,128,0.12); border: 1px solid var(--line); border-radius: 4px; padding: 1px 5px; }
.ai-answer pre { background: rgba(128,128,128,0.08); border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; overflow-x: auto; margin: 12px 0; }
.ai-answer pre code { background: none; border: none; padding: 0; font-size: 0.84rem; line-height: 1.6; }
.ai-answer blockquote { margin: 10px 0; padding: 4px 14px; border-left: 3px solid var(--line); color: var(--ink-dim); }
.ai-answer hr { border: none; border-top: 1px solid var(--line); margin: 16px 0; }
.ai-answer table { border-collapse: collapse; width: 100%; margin: 12px 0; font-size: 0.92rem; }
.ai-answer th, .ai-answer td { border: 1px solid var(--line); padding: 7px 11px; text-align: left; vertical-align: top; line-height: 1.5; }
.ai-answer th { background: rgba(128,128,128,0.09); color: var(--ink); font-weight: 600; }
.ai-answer tbody tr:nth-child(even) { background: rgba(128,128,128,0.05); }

/* 引用文件名（回复下方） */
.sources { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.sources__label { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-faint); margin-right: 2px; }
.source-chip { font-family: var(--sans); font-size: 0.76rem; color: var(--ink-dim); border: 1px solid var(--line); border-radius: 100px; padding: 5px 13px; transition: background 0.25s, border-color 0.25s, color 0.25s; }
a.source-chip:hover { background: rgba(128,128,128,0.08); border-color: var(--ink-dim); color: var(--ink); }

/* 流中断/出错提示：追加在已保留的半截正文之后（fail 不清屏，用户读过的内容不动） */
.ai-answer__err { margin-top: 10px; font-size: 0.88rem; line-height: 1.7; color: var(--ink-dim); border-left: 3px solid rgba(224,92,68,0.55); background: rgba(224,92,68,0.08); padding: 8px 14px; border-radius: 0 8px 8px 0; }
/* 用户主动停止：中性灰（这是用户要的结果，不是错误） */
.ai-answer__err.is-stop { border-left-color: var(--line); background: rgba(128,128,128,0.07); }

/* 信息卡片获客：挂在最新回复下方的「公司名称/联系人/电话」卡片（lead_card 事件驱动，单例移动）。
   视觉与思考框同族——安静的圆角面板，仅白底+浅阴影稍作强调，不抢正文。 */
.lead-card { border: 1px solid var(--line); background: rgba(128,128,128,0.05); border-radius: 14px; padding: 18px 20px; }
.assistant.is-light .lead-card { background: #ffffff; border-color: #e5e6e8; box-shadow: 0 4px 18px rgba(0,0,0,0.05); }
.lead-card__title { font-size: 0.98rem; font-weight: 600; color: var(--ink); }
.lead-card__sub { margin-top: 6px; font-size: 0.84rem; color: var(--ink-dim); }
/* 三个输入框一行、按钮独占下一行靠右。列宽必须用 minmax(0,1fr)：input 有约 200px 的固有最小宽度，
   裸 1fr 收不下去，四列会把表单撑出卡片外——按钮被挤出去裁成一条黑竖条（2026-07-10 踩坑实录）。 */
.lead-card__form { margin-top: 14px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.lead-card__form input { min-width: 0; background: rgba(128,128,128,0.07); border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; color: var(--ink); font-family: var(--sans); font-size: 0.9rem; outline: none; transition: border-color 0.25s; }
.assistant.is-light .lead-card__form input { background: #f7f8f9; }
.lead-card__form input:focus { border-color: var(--ink-dim); }
.lead-card__form button { grid-column: 1 / -1; justify-self: end; border: none; border-radius: 10px; padding: 10px 28px; background: var(--ink); color: var(--paper); font-family: var(--sans); font-size: 0.9rem; cursor: pointer; transition: opacity 0.25s; }
.lead-card__form button:hover { opacity: 0.85; }
.lead-card__form button:disabled { opacity: 0.5; cursor: default; }
.lead-card__note { margin-top: 8px; font-size: 0.78rem; color: var(--ink-dim); min-height: 1em; }
.lead-card__thanks { font-size: 0.92rem; color: var(--ink); }

/* 「停止生成」方块：生成中发送按钮的箭头换成它（按钮本身是 grid 居中，currentColor 随主题） */
.stop-square { display: block; width: 13px; height: 13px; border-radius: 3px; background: currentColor; }

/* 答案尾部操作条（Claude 式）：复制 / 重新回答 */
.ai-actions { display: flex; gap: 10px; margin-top: 2px; }
.ai-actions button { background: none; border: none; cursor: pointer; font-family: var(--mono); font-size: 0.74rem; color: var(--ink-faint); padding: 4px 8px; border-radius: 6px; transition: color 0.25s, background 0.25s; }
.ai-actions button:hover { color: var(--ink); background: rgba(128,128,128,0.1); }

/* 底部：建议 + 输入（参考截图：无顶部分隔线，一只悬浮的大圆角输入容器 + 圆形发送键） */
.assistant__foot { position: relative; z-index: 1; padding: 10px clamp(18px,5vw,40px) 12px; max-width: 760px; width: 100%; margin: 0 auto; }
.assistant__suggest { display: flex; gap: 9px; flex-wrap: wrap; margin-bottom: 12px; }
.assistant__input { display: flex; align-items: center; gap: 8px; background: rgba(128,128,128,0.08); border: 1px solid var(--line); border-radius: 18px; padding: 8px 8px 8px 14px; transition: border-color 0.3s, box-shadow 0.3s; }
.assistant__input:focus-within { border-color: var(--ink-dim); }
.assistant__input input { flex: 1; background: none; border: none; padding: 10px 6px; color: var(--ink); font-family: var(--sans); font-size: 0.98rem; outline: none; }
.assistant__input button { width: 40px; height: 40px; flex: none; border: none; border-radius: 50%; cursor: pointer; background: var(--ink); color: var(--paper); display: grid; place-items: center; transition: opacity 0.25s; }
.assistant__input button:hover { opacity: 0.85; }
.assistant__note { text-align: center; font-size: 0.68rem; color: var(--ink-faint); margin-top: 10px; }
body.assistant-open { overflow: hidden; }

/* ================= 入场初态（JS 接管前隐藏，无 JS 时可见） ================= */
.js-anim [data-line] .char, .js-anim [data-par], .js-anim [data-cap] { will-change: transform; }

/* ================= 响应式 ================= */
@media (max-width: 1000px) {
  .caps__stack { grid-template-columns: 1fr; }
  .cap--lead, .cap--b, .cap--c, .cap--d, .cap--e { grid-column: auto; grid-row: auto; }
  .contact__inner { grid-template-columns: 1fr; }
  .rail { display: none; }
  /* Part4：窄屏改为竖排，介绍在上、实景预览在下，均满宽 */
  .intro__inner { grid-template-columns: 1fr; gap: 34px; }
  .demo { width: 100%; }
  .shelf__inner { grid-template-columns: 1fr; }
  .shelf__stage { height: 480px; }
}
@media (max-width: 720px) {
  .lead-card__form { grid-template-columns: 1fr; }
  .lead-card__form button { justify-self: stretch; }   /* 窄屏：输入竖排，按钮通栏 */
  .nav__menu { position: fixed; inset: 0 0 auto 0; flex-direction: column; align-items: flex-start; gap: 6px; padding: 86px clamp(20px,6vw,40px) 30px; background: rgba(10,15,12,0.96); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-bottom: 1px solid var(--line); transform: translateY(-100%); transition: transform 0.45s var(--ease); z-index: -1; font-size: 1.1rem; }
  .nav.is-open .nav__menu { transform: translateY(0); }
  .nav__burger { display: flex; }
  .lead { grid-template-columns: 1fr; }
  .footer { flex-direction: column; align-items: flex-start; }
}

/* ================= 尊重 prefers-reduced-motion ================= */
@media (prefers-reduced-motion: reduce) {
  .grain, .hero__scroll { animation: none; }
  * { scroll-behavior: auto !important; }
}