/* ==========================================================================
   AI写小说 · AI小说写作助手创作平台
   中式小说传统风格样式表（宣纸 · 水墨 · 朱砂 · 描金）
   ========================================================================== */

:root {
  /* 墨色 */
  --ink: #1d1b17;
  --ink-soft: #3b352d;
  --ink-mute: #6b6357;
  --line: rgba(29, 27, 23, .14);

  /* 宣纸 */
  --paper: #f7f2e7;
  --paper-2: #f1e9d8;
  --paper-3: #e9dfca;

  /* 朱砂 */
  --cinnabar: #a8342a;
  --cinnabar-deep: #8a2820;
  --cinnabar-soft: rgba(168, 52, 42, .1);

  /* 描金 · 青瓷 */
  --gold: #b28f4f;
  --gold-soft: #d9c08a;
  --jade: #4c6b5d;

  --radius: 4px;
  --radius-lg: 8px;
  --shadow: 0 8px 30px rgba(29, 27, 23, .08);
  --shadow-lg: 0 20px 60px rgba(29, 27, 23, .14);
  --maxw: 1180px;

  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Source Han Serif CN",
    "Songti SC", "STSong", "SimSun", "宋体", serif;
  --font-kai: "Kaiti SC", "STKaiti", "KaiTi", "楷体", var(--font-serif);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font-serif);
  color: var(--ink-soft);
  background-color: var(--paper);
  /* 宣纸肌理：极淡的径向纹理 */
  background-image:
    radial-gradient(circle at 20% 15%, rgba(178, 143, 79, .06), transparent 42%),
    radial-gradient(circle at 82% 78%, rgba(168, 52, 42, .05), transparent 46%),
    radial-gradient(circle at 50% 50%, rgba(76, 107, 93, .04), transparent 60%);
  line-height: 1.9;
  font-size: 17px;
  letter-spacing: .02em;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { color: var(--ink); line-height: 1.35; font-weight: 700; margin: 0 0 .6em; }
p { margin: 0 0 1em; }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}
.container.narrow { max-width: 860px; }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--ink); color: var(--paper);
  padding: 10px 16px; z-index: 999;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4em;
  padding: 11px 24px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: .06em;
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background-color .18s ease, color .18s ease;
}
.btn-lg { padding: 15px 34px; font-size: 17px; }

.btn-primary {
  color: #fdf6ea;
  background: linear-gradient(135deg, var(--cinnabar) 0%, var(--cinnabar-deep) 100%);
  box-shadow: 0 6px 20px rgba(168, 52, 42, .28);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(168, 52, 42, .36); }

.btn-ghost {
  color: var(--ink);
  background: transparent;
  border-color: rgba(29, 27, 23, .28);
}
.btn-ghost:hover { background: rgba(29, 27, 23, .05); transform: translateY(-2px); }

/* ---------- 印章 ---------- */
.brand-seal,
.seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-kai);
  color: #fdf6ea;
  background: linear-gradient(140deg, var(--cinnabar), var(--cinnabar-deep));
  border-radius: 5px;
  box-shadow: inset 0 0 0 2px rgba(253, 246, 234, .55);
  letter-spacing: 0;
}
.brand-seal { width: 44px; height: 44px; font-size: 22px; }
.seal { width: 66px; height: 66px; font-size: 20px; line-height: 1.05; padding: 6px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(247, 242, 231, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 74px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong { font-size: 19px; color: var(--ink); letter-spacing: .14em; }
.brand-text em { font-style: normal; font-size: 11.5px; color: var(--ink-mute); letter-spacing: .22em; }

.main-nav { margin-left: auto; }
.main-nav ul { display: flex; gap: 30px; list-style: none; margin: 0; padding: 0; }
.main-nav a {
  position: relative;
  font-size: 15.5px;
  color: var(--ink-soft);
  padding: 6px 0;
  letter-spacing: .08em;
}
.main-nav a::after {
  content: "";
  position: absolute; left: 0; bottom: 0;
  width: 0; height: 2px;
  background: var(--cinnabar);
  transition: width .25s ease;
}
.main-nav a:hover { color: var(--cinnabar); }
.main-nav a:hover::after { width: 100%; }

.header-cta { white-space: nowrap; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px; height: 42px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
}
.nav-toggle span { display: block; height: 2px; background: var(--ink); width: 20px; margin: 0 auto; transition: .25s; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-nav {
  border-top: 1px solid var(--line);
  background: var(--paper);
}
.mobile-nav ul { list-style: none; margin: 0; padding: 10px 24px 20px; display: flex; flex-direction: column; gap: 4px; }
.mobile-nav a { display: block; padding: 12px 4px; border-bottom: 1px dashed var(--line); }
.mobile-nav .btn { margin-top: 12px; border-bottom: 0; }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding: 76px 0 88px; }
.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 12% 18%, rgba(178, 143, 79, .13), transparent 50%),
    radial-gradient(ellipse at 88% 82%, rgba(168, 52, 42, .1), transparent 52%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 64px;
  align-items: center;
}
.eyebrow {
  display: inline-block;
  font-size: 13.5px;
  letter-spacing: .28em;
  color: var(--cinnabar);
  border-left: 3px solid var(--cinnabar);
  padding-left: 12px;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.4;
  letter-spacing: .03em;
  margin-bottom: 22px;
}
.hero-desc { font-size: 17.5px; color: var(--ink-mute); max-width: 34em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; margin: 30px 0 16px; }
.hero-note {
  font-size: 14.5px;
  color: var(--jade);
  background: rgba(76, 107, 93, .08);
  border-left: 3px solid var(--jade);
  padding: 8px 14px;
  display: inline-block;
}

.hero-figure { position: relative; margin: 0; }
/* 卷轴式画框 */
.scroll-frame {
  position: relative;
  padding: 14px;
  background: linear-gradient(145deg, var(--paper-2), var(--paper-3));
  border: 1px solid var(--gold-soft);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}
.scroll-frame::before,
.scroll-frame::after {
  content: "";
  position: absolute;
  left: 4px; right: 4px; height: 10px;
  background: linear-gradient(90deg, var(--gold), var(--gold-soft), var(--gold));
  border-radius: 6px;
  opacity: .8;
}
.scroll-frame::before { top: -5px; }
.scroll-frame::after { bottom: -5px; }
.scroll-frame img { border-radius: 2px; }

.hero-vertical {
  position: absolute;
  top: 30px;
  left: -52px;
  writing-mode: vertical-rl;
  font-family: var(--font-kai);
  font-size: 15px;
  letter-spacing: .3em;
  color: var(--ink-mute);
}

/* ---------- 通用区块 ---------- */
.section { padding: 84px 0; }
.section-tag {
  display: inline-block;
  font-size: 13px;
  letter-spacing: .3em;
  color: var(--cinnabar);
  margin-bottom: 10px;
}
.section-tag::before { content: "「"; }
.section-tag::after { content: "」"; }

.section-head { text-align: center; max-width: 760px; margin: 0 auto 54px; }
.section-head h2 { font-size: clamp(24px, 3.2vw, 34px); letter-spacing: .04em; }
.section-sub { color: var(--ink-mute); font-size: 16px; margin: 0; }

h2 { font-size: clamp(24px, 3.2vw, 32px); letter-spacing: .04em; }

/* 左右分栏 */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.split.reverse .split-media { order: 2; }

.img-frame {
  padding: 12px;
  background: var(--paper-2);
  border: 1px solid var(--gold-soft);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}
.img-frame img { border-radius: 2px; }

.check-list { list-style: none; margin: 22px 0 0; padding: 0; }
.check-list li {
  position: relative;
  padding: 8px 0 8px 30px;
  color: var(--ink-soft);
}
.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0; top: 8px;
  width: 20px; height: 20px;
  font-size: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fdf6ea;
  background: var(--cinnabar);
  border-radius: 50%;
}

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 24px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  position: relative;
  padding: 34px 26px 28px;
  background: linear-gradient(180deg, #fffdf7, var(--paper-2));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--gold-soft); }
.card-no {
  display: block;
  font-family: var(--font-kai);
  font-size: 15px;
  letter-spacing: .2em;
  color: var(--cinnabar);
  margin-bottom: 12px;
}
.card h3 { font-size: 19px; margin-bottom: 10px; }
.card p { color: var(--ink-mute); font-size: 15.5px; margin: 0; }

/* ---------- 题材 ---------- */
.genres { background: rgba(241, 233, 216, .5); }
.stat-line { font-size: 17px; color: var(--ink-soft); }
.stat-num {
  font-size: 40px;
  font-weight: 700;
  color: var(--cinnabar);
  font-family: var(--font-serif);
  margin-right: 6px;
  vertical-align: -6px;
}
.tag-list { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.tag {
  padding: 8px 18px;
  font-size: 15px;
  color: var(--ink-soft);
  background: #fffdf7;
  border: 1px solid var(--line);
  border-radius: 2px;
  letter-spacing: .06em;
  transition: .2s;
}
.tag:hover { color: #fdf6ea; background: var(--cinnabar); border-color: var(--cinnabar); }

/* ---------- 三步上手 ---------- */
.step-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.step-list { list-style: none; margin: 0; padding: 0; counter-reset: step; }
.step {
  position: relative;
  padding: 0 0 30px 62px;
  border-left: 2px dashed var(--line);
  margin-left: 22px;
}
.step:last-child { padding-bottom: 0; border-left-color: transparent; }
.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: -23px; top: -4px;
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  font-size: 19px; font-weight: 700;
  color: #fdf6ea;
  background: linear-gradient(140deg, var(--cinnabar), var(--cinnabar-deep));
  border-radius: 50%;
  box-shadow: 0 6px 18px rgba(168, 52, 42, .3);
}
.step-index { font-size: 13px; letter-spacing: .2em; color: var(--gold); }
.step h3 { font-size: 20px; margin: 4px 0 8px; }
.step p { color: var(--ink-mute); font-size: 15.5px; margin: 0; }

.center-cta { text-align: center; margin-top: 56px; }

/* ---------- 为什么选我们 ---------- */
.why { background: rgba(241, 233, 216, .5); }
.why-item {
  padding: 28px 24px;
  background: #fffdf7;
  border: 1px solid var(--line);
  border-top: 3px solid var(--gold);
  border-radius: var(--radius);
}
.why-item h3 { font-size: 18.5px; margin-bottom: 10px; }
.why-item p { color: var(--ink-mute); font-size: 15.5px; margin: 0; }

/* ---------- FAQ ---------- */
.faq-list { display: grid; gap: 14px; }
.faq-item {
  background: #fffdf7;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cinnabar);
  border-radius: var(--radius);
  padding: 0 22px;
  transition: box-shadow .2s;
}
.faq-item[open] { box-shadow: var(--shadow); }
.faq-item summary {
  cursor: pointer;
  list-style: none;
  padding: 20px 30px 20px 0;
  font-size: 17.5px;
  font-weight: 700;
  color: var(--ink);
  position: relative;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "＋";
  position: absolute;
  right: 0; top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: var(--cinnabar);
}
.faq-item[open] summary::after { content: "－"; }
.faq-item p { color: var(--ink-mute); font-size: 15.5px; padding-bottom: 20px; margin: 0; }

/* ---------- 结尾 CTA ---------- */
.final-cta { padding-bottom: 100px; }
.cta-box {
  text-align: center;
  padding: 64px 32px;
  background: linear-gradient(160deg, var(--paper-2), var(--paper-3));
  border: 1px solid var(--gold-soft);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}
.cta-box::before,
.cta-box::after {
  content: "";
  position: absolute;
  width: 220px; height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(168, 52, 42, .1), transparent 70%);
}
.cta-box::before { top: -90px; left: -70px; }
.cta-box::after { bottom: -90px; right: -70px; }
.cta-box .seal { margin-bottom: 20px; }
.cta-box h2 { position: relative; }
.cta-box p { position: relative; color: var(--ink-mute); max-width: 40em; margin: 0 auto 26px; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--ink);
  color: rgba(247, 242, 231, .78);
  padding: 60px 0 26px;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 48px;
  justify-content: space-between;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(247, 242, 231, .14);
}
.footer-brand { display: flex; gap: 16px; max-width: 32em; }
.footer-brand strong { color: var(--paper); font-size: 19px; letter-spacing: .14em; display: block; margin-bottom: 6px; }
.footer-brand p { font-size: 14.5px; margin: 0; color: rgba(247, 242, 231, .6); }
.footer-nav { display: flex; gap: 72px; }
.footer-nav h3 { color: var(--gold-soft); font-size: 15px; letter-spacing: .14em; margin-bottom: 14px; }
.footer-nav ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.footer-nav a { font-size: 15px; color: rgba(247, 242, 231, .72); transition: color .2s; }
.footer-nav a:hover { color: var(--paper); }
.footer-bottom { padding-top: 22px; text-align: center; }
.footer-bottom p { margin: 0; font-size: 13.5px; color: rgba(247, 242, 231, .5); }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .hero-inner { gap: 44px; }
  .hero-vertical { display: none; }
  .split, .step-layout { gap: 40px; }
}

@media (max-width: 860px) {
  .main-nav, .header-cta { display: none; }
  .nav-toggle { display: flex; margin-left: auto; }
  .hero-inner,
  .split,
  .step-layout { grid-template-columns: 1fr; }
  .hero { padding: 48px 0 60px; }
  .split.reverse .split-media { order: 0; }
  .section { padding: 60px 0; }
  .footer-inner { flex-direction: column; gap: 32px; }
  .footer-nav { gap: 40px; }
}

@media (max-width: 560px) {
  body { font-size: 16px; }
  .grid-4 { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .footer-nav { flex-direction: column; gap: 28px; }
  .stat-num { font-size: 34px; }
}

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