/* Grok Bot 中文网 — 纸、墨、朱砂 */

:root {
  --paper: #f4efe5;
  --paper-deep: #ebe4d6;
  --card: #fbf8f1;
  --ink: #1b1814;
  --ink-soft: #57503f;
  --rule: #cfc6b3;
  --seal: #c2371c;
  --serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "STSong", "SimSun", Georgia, serif;
  --sans: -apple-system, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --latin: Georgia, "Times New Roman", var(--serif);
  --gutter: clamp(1rem, 4vw, 2.5rem);
}

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

html { scroll-behavior: smooth; scroll-padding-top: 5rem; -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;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; text-decoration-color: var(--seal); text-underline-offset: .25em; text-decoration-thickness: 1px; }
a:hover { color: var(--seal); }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--seal); outline-offset: 3px; }

p { margin: 0 0 1em; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { margin: 0; font-family: var(--serif); font-weight: 700; line-height: 1.3; }

.wrap { width: 100%; max-width: 74rem; margin: 0 auto; padding: 0 var(--gutter); }

.skip { position: absolute; left: -999px; top: 0; background: var(--ink); color: var(--paper); padding: .5em 1em; z-index: 30; }
.skip:focus { left: 0; }

/* ---------- 顶栏与页头 ---------- */

.topbar {
  margin: 0;
  background: var(--ink);
  color: #c9c1b0;
  font-size: .78rem;
  letter-spacing: .06em;
  text-align: center;
  padding: .45rem var(--gutter);
}
.topbar span { color: var(--seal); margin: 0 .4em; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(244, 239, 229, .94);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--ink);
}
.header-in { display: flex; align-items: center; gap: 1rem 2rem; min-height: 4rem; flex-wrap: wrap; padding-top: .5rem; padding-bottom: .5rem; }

.brand { display: inline-flex; align-items: center; gap: .6rem; text-decoration: none; margin-right: auto; }
.brand:hover { color: inherit; }
.brand-mark { display: block; transform: rotate(-4deg); transition: transform .3s; }
.brand:hover .brand-mark { transform: rotate(0); }
.brand-name { font-family: var(--latin); font-size: 1.35rem; font-weight: 700; letter-spacing: -.01em; }
.brand-cn { font-family: var(--serif); font-size: .9rem; color: var(--seal); letter-spacing: .18em; padding-top: .3em; }

.nav { display: flex; flex-wrap: wrap; gap: .1rem 1.5rem; font-size: .93rem; }
.nav a { text-decoration: none; padding: .3em 0; border-bottom: 2px solid transparent; }
.nav a:hover { border-bottom-color: var(--seal); color: var(--ink); }

/* ---------- 按钮 ---------- */

.btn {
  display: inline-block;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  text-decoration: none;
  padding: .7em 1.6em;
  font-family: var(--serif);
  letter-spacing: .1em;
  box-shadow: 4px 4px 0 var(--seal);
  transition: transform .15s, box-shadow .15s;
}
.btn:hover { color: var(--paper); transform: translate(2px, 2px); box-shadow: 2px 2px 0 var(--seal); }
.btn-ghost { background: transparent; color: var(--ink); box-shadow: none; }
.btn-ghost:hover { background: var(--ink); color: var(--paper); transform: none; box-shadow: none; }
.btn-small { padding: .4em 1.1em; font-size: .88rem; box-shadow: 3px 3px 0 var(--seal); }

/* ---------- 首屏 ---------- */

.hero { padding: clamp(2.5rem, 6vw, 5rem) 0 clamp(2.5rem, 5vw, 4.5rem); overflow: hidden; }
.hero-in { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr); gap: clamp(2rem, 5vw, 4.5rem); align-items: center; }

.kicker { font-size: .85rem; letter-spacing: .22em; color: var(--seal); margin-bottom: 1.2rem; }

h1 { font-weight: 900; line-height: 1; letter-spacing: -.02em; }
.h1-en { display: block; font-family: var(--latin); font-size: clamp(3.4rem, 10vw, 7.5rem); }
.h1-cn { display: block; font-size: clamp(1.7rem, 4.4vw, 3.1rem); letter-spacing: .32em; margin-top: .3em; color: var(--seal); }

.hero-lead { font-size: 1.08rem; color: var(--ink-soft); max-width: 33em; margin: 1.8rem 0 0; padding-top: 1.4rem; border-top: 1px solid var(--ink); }
.hero-links { display: flex; flex-wrap: wrap; gap: 1rem 1.2rem; margin: 2rem 0 0; }

.factsheet {
  background: var(--card);
  border: 1px solid var(--ink);
  box-shadow: 9px 9px 0 var(--seal);
  padding: 1.4rem 1.5rem 1rem;
  transform: rotate(1.2deg);
}
.factsheet-title { font-family: var(--serif); font-weight: 700; font-size: 1.05rem; letter-spacing: .3em; margin: 0 0 .6rem; padding-bottom: .7rem; border-bottom: 2px solid var(--ink); }
.factsheet dl { margin: 0; }
.factsheet dl > div { display: flex; justify-content: space-between; gap: 1rem; padding: .5rem 0; border-bottom: 1px dashed var(--rule); font-size: .92rem; }
.factsheet dl > div:last-child { border-bottom: 0; }
.factsheet dt { color: var(--ink-soft); flex: none; }
.factsheet dd { margin: 0; text-align: right; font-weight: 600; }

/* ---------- 数字条 ---------- */

.strip { border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); background: var(--paper-deep); }
.strip-in { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.strip p { margin: 0; padding: 1.3rem 1rem 1.3rem 0; font-size: .88rem; color: var(--ink-soft); }
.strip p + p { padding-left: 1.4rem; border-left: 1px solid var(--rule); }
.strip strong { display: block; font-family: var(--latin); font-size: 2rem; line-height: 1.2; color: var(--ink); }

/* ---------- 通用区块 ---------- */

.block { padding: clamp(3rem, 7vw, 5.5rem) 0; }
.block-tint { background: var(--paper-deep); border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }

.block-head { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: .4rem 3rem; align-items: end; margin-bottom: 2.4rem; }
.label { grid-column: 1 / -1; font-family: var(--latin); font-size: .85rem; letter-spacing: .14em; color: var(--seal); margin: 0; }
h2 { font-size: clamp(1.8rem, 3.6vw, 2.6rem); font-weight: 900; letter-spacing: -.01em; }
.block-intro { margin: 0; color: var(--ink-soft); max-width: 34em; }

.note { margin: 1.4rem 0 0; font-size: .9rem; color: var(--ink-soft); padding-left: 1em; border-left: 3px solid var(--seal); }

/* ---------- 认识：对照 ---------- */

.versus { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); align-items: stretch; }
.versus article { border: 1px solid var(--ink); padding: 1.6rem 1.7rem; background: var(--card); }
.versus h3 { font-size: 1.3rem; margin-bottom: .6rem; }
.versus p { margin: 0; color: var(--ink-soft); }
.versus-hot { background: var(--ink) !important; color: var(--paper); }
.versus-hot p { color: #d3cbb9; }
.versus-mid { align-self: center; margin: 0 -1.1rem; z-index: 1; width: 2.6rem; height: 2.6rem; border-radius: 50%; background: var(--seal); color: var(--paper); font-family: var(--serif); font-weight: 700; display: grid; place-items: center; }

/* ---------- 功能：格子 ---------- */

.features { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); counter-reset: f; }
.features article { counter-increment: f; position: relative; padding: 1.6rem 1.6rem 1.5rem; border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink); background: var(--card); transition: background .2s; }
.features article:hover { background: #fff; }
.features article::before { content: counter(f, decimal-leading-zero); display: block; font-family: var(--latin); font-style: italic; color: var(--seal); margin-bottom: .7rem; }
.features h3 { font-size: 1.18rem; margin-bottom: .45rem; }
.features p { margin: 0; font-size: .95rem; color: var(--ink-soft); }

/* ---------- 用法 ---------- */

.cases { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2.2rem 2.4rem; }
.cases article { border-top: 2px solid var(--ink); padding-top: 1rem; }
.cases h3 { font-size: 1.25rem; }
.cases h4 { font-family: var(--sans); font-weight: 400; font-size: .8rem; letter-spacing: .06em; color: var(--seal); margin: .3rem 0 .6rem; }
.cases p { margin: 0; font-size: .95rem; color: var(--ink-soft); }

/* ---------- 价格（深色） ---------- */

.block-ink { background: var(--ink); color: var(--paper); }
.block-ink .block-intro { color: #c9c1b0; }
.block-ink .label { color: #e8674b; }

.plans { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.4rem; align-items: start; }
.plans article { border: 1px solid #4a4336; padding: 1.7rem 1.6rem; }
.plans h3 { font-family: var(--latin); font-size: 1.4rem; }
.price { margin: .6rem 0 1.1rem; padding-bottom: 1.1rem; border-bottom: 1px solid #4a4336; color: #c9c1b0; font-size: .9rem; }
.price strong { font-family: var(--latin); font-size: 3.2rem; line-height: 1; color: var(--paper); margin-right: .15em; }
.plans li { position: relative; padding: .35rem 0 .35rem 1.3rem; font-size: .93rem; color: #d3cbb9; }
.plans li::before { content: ""; position: absolute; left: 0; top: 1.05em; width: .6rem; height: 1px; background: #e8674b; }
.plan-hot { background: var(--paper); color: var(--ink); border-color: var(--paper) !important; box-shadow: 8px 8px 0 var(--seal); transform: translateY(-.6rem); }
.plan-hot .price { color: var(--ink-soft); border-bottom-color: var(--rule); }
.plan-hot .price strong { color: var(--seal); }
.plan-hot li { color: var(--ink-soft); }
.plan-hot li::before { background: var(--seal); }

.invite { margin-top: 3rem; padding: 1.8rem 2rem; background: var(--seal); color: #fff; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 1.5rem 3rem; align-items: center; box-shadow: 8px 8px 0 #4a4336; }
.invite h3 { font-size: 1.45rem; margin-bottom: .5rem; }
.invite p { margin: 0 0 .8rem; font-size: .96rem; max-width: 40em; }
.invite ul { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .1rem 2rem; margin-bottom: .9rem; }
.invite li { position: relative; padding-left: 1.1rem; font-size: .88rem; }
.invite li::before { content: ""; position: absolute; left: 0; top: .85em; width: .5rem; height: 1px; background: #fff; }
.invite-fine { font-size: .8rem !important; opacity: .85; margin: 0 !important; }
.btn-seal { background: var(--paper); color: var(--ink); border-color: var(--paper); box-shadow: 4px 4px 0 var(--ink); white-space: nowrap; }
.btn-seal:hover { color: var(--ink); box-shadow: 2px 2px 0 var(--ink); }
@media (max-width: 760px) {
  .invite { grid-template-columns: 1fr; padding: 1.5rem 1.3rem; }
  .invite ul { grid-template-columns: 1fr; }
  .btn-seal { justify-self: start; }
}

.plan-notes { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2rem; margin-top: 3rem; padding-top: 2rem; border-top: 1px solid #4a4336; }
.plan-notes h3 { font-size: 1.05rem; margin-bottom: .4rem; }
.plan-notes p { margin: 0; font-size: .9rem; color: #c9c1b0; }

/* ---------- 视频 ---------- */

.videos { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2.4rem 1.8rem; }
.video-lead { grid-column: span 2; grid-row: span 2; }
.frame { position: relative; aspect-ratio: 16 / 9; background: var(--ink); border: 1px solid var(--ink); box-shadow: 5px 5px 0 var(--rule); }
.video-lead .frame { box-shadow: 8px 8px 0 var(--seal); }
.frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video h3 { margin: 1.1rem 0 .2rem; font-size: 1.05rem; }
.video-lead h3 { font-size: 1.5rem; margin-top: 1.4rem; }
.video-meta { font-size: .78rem; letter-spacing: .05em; color: var(--seal); margin-bottom: .35em; }
.video p:last-child { font-size: .9rem; color: var(--ink-soft); margin: 0; }

/* ---------- 对比表 ---------- */

.table-wrap { overflow-x: auto; background: var(--card); border: 1px solid var(--ink); }
table { width: 100%; border-collapse: collapse; font-size: .94rem; min-width: 44rem; }
caption { caption-side: bottom; text-align: left; font-size: .8rem; color: var(--ink-soft); padding: .8rem 1.2rem; border-top: 1px solid var(--rule); }
thead th { text-align: left; font-family: var(--sans); font-weight: 400; font-size: .8rem; letter-spacing: .15em; color: var(--paper); background: var(--ink); padding: .8rem 1.2rem; }
tbody th, tbody td { padding: .95rem 1.2rem; border-top: 1px solid var(--rule); text-align: left; vertical-align: top; }
tbody th { font-family: var(--latin); font-size: 1.05rem; white-space: nowrap; }
tbody td { color: var(--ink-soft); }
.row-hot th, .row-hot td { background: #fff; color: var(--ink); }
.row-hot th { color: var(--seal); box-shadow: inset 4px 0 0 var(--seal); }

.verdict { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.6rem; margin-top: 1.8rem; }
.verdict > div { border-top: 2px solid var(--ink); padding-top: .9rem; }
.verdict h3 { font-size: 1.1rem; margin-bottom: .3rem; }
.verdict p { margin: 0; color: var(--ink-soft); font-size: .95rem; }

/* ---------- 更新日志 ---------- */

.log { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border-top: 1px solid var(--ink); }
.log li { position: relative; padding: 1.5rem 1.6rem 1.6rem 0; border-bottom: 1px solid var(--rule); }
.log li:not(:nth-child(3n+1)) { padding-left: 1.6rem; border-left: 1px solid var(--rule); }
.log li::before { content: ""; position: absolute; top: -5px; left: 0; width: 9px; height: 9px; background: var(--seal); }
.log li:not(:nth-child(3n+1))::before { left: 1.6rem; }
.log li:nth-child(n+4)::before { display: none; }
.log time { font-family: var(--latin); font-size: .9rem; letter-spacing: .06em; color: var(--seal); }
.log h3 { font-size: 1.15rem; margin: .2rem 0 .4rem; }
.log p { margin: 0; font-size: .93rem; color: var(--ink-soft); }

/* ---------- 上手步骤 ---------- */

.steps { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); counter-reset: s; border: 1px solid var(--ink); background: var(--card); }
.steps li { counter-increment: s; padding: 1.4rem 1.3rem 1.5rem; }
.steps li + li { border-left: 1px solid var(--ink); }
.steps li::before { content: counter(s, cjk-ideographic); display: block; font-family: var(--serif); font-size: 2.4rem; line-height: 1.1; color: var(--seal); margin-bottom: .5rem; }
.steps h3 { font-size: 1.08rem; margin-bottom: .35rem; }
.steps p { margin: 0; font-size: .9rem; color: var(--ink-soft); }

.cautions { margin-top: 3rem; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2.2fr); gap: 1.5rem 3rem; }
.cautions > h3 { font-size: 1.5rem; }
.cautions li { padding: .9rem 0; border-top: 1px solid var(--rule); font-size: .95rem; color: var(--ink-soft); display: grid; grid-template-columns: 9.5em minmax(0, 1fr); gap: 1rem; }
.cautions li:last-child { border-bottom: 1px solid var(--rule); }
.cautions h4 { font-size: 1rem; color: var(--ink); }

/* ---------- 问答 ---------- */

.faq { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 3rem; align-items: start; }
details { border-top: 1px solid var(--ink); }
summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; padding: 1rem 0; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "＋"; color: var(--seal); transition: transform .25s; flex: none; }
details[open] summary::after { transform: rotate(45deg); }
summary h3 { font-size: 1.08rem; }
summary:hover h3 { color: var(--seal); }
details p { color: var(--ink-soft); font-size: .95rem; padding-bottom: .5rem; }

/* ---------- 页脚 ---------- */

.site-footer { background: var(--ink); color: #bdb5a4; font-size: .9rem; padding: 3.5rem 0 2rem; }
.footer-in { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 2rem 3rem; }
.footer-name { font-family: var(--latin); font-size: 1.5rem; color: var(--paper); margin-bottom: .5rem; }
.footer-brand p:last-child { max-width: 20em; }
.footer-title { color: var(--paper); font-family: var(--serif); letter-spacing: .12em; margin-bottom: .7rem; }
.site-footer nav a { display: block; text-decoration: none; padding: .2rem 0; }
.site-footer nav a:hover { color: var(--paper); text-decoration: underline; }
.footer-fine { margin-top: 2.5rem; padding-top: 1.4rem; border-top: 1px solid #3b352b; font-size: .8rem; opacity: .85; display: flex; flex-wrap: wrap; justify-content: space-between; gap: .4rem 2rem; }
.footer-fine p { margin: 0; }

/* ---------- 响应式 ---------- */

@media (max-width: 960px) {
  .hero-in { grid-template-columns: 1fr; }
  .factsheet { transform: none; max-width: 30rem; }
  .features, .cases, .plan-notes { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .videos { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .video-lead { grid-column: 1 / -1; grid-row: auto; }
  .steps { grid-template-columns: 1fr; }
  .steps li { display: grid; grid-template-columns: 3.2rem minmax(0, 1fr); column-gap: .6rem; }
  .steps li::before { grid-row: span 2; }
  .steps li + li { border-left: 0; border-top: 1px solid var(--ink); }
  .log { grid-template-columns: 1fr; }
  .log li, .log li:not(:nth-child(3n+1)) { padding: 1.2rem 0 1.2rem 1.4rem; border-left: 1px solid var(--ink); }
  .log li::before, .log li:not(:nth-child(3n+1))::before { display: block; top: 1.7rem; left: -5px; }
  .cautions { grid-template-columns: 1fr; }
  .footer-in { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .nav { order: 3; width: 100%; }
}

@media (max-width: 640px) {
  .block-head { grid-template-columns: 1fr; }
  .strip-in { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .strip p:nth-child(3) { padding-left: 0; border-left: 0; }
  .strip p:nth-child(n+3) { border-top: 1px solid var(--rule); }
  .versus { grid-template-columns: 1fr; }
  .versus-mid { margin: -1rem auto; }
  .features, .cases, .plans, .plan-notes, .videos, .verdict, .faq { grid-template-columns: 1fr; }
  .plan-hot { transform: none; }
  .cautions li { grid-template-columns: 1fr; gap: .2rem; }
  .nav { gap: .1rem 1.1rem; font-size: .88rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

@media print {
  .topbar, .site-header, .hero-links, .frame, .skip { display: none; }
  body { background: #fff; }
}