/* ============================================================
   秉灯官网 · 墨韵东方设计系统（公开站点）
   来源：UI 设计定稿 home.html
   ============================================================ */

/* ============ 设计令牌 ============ */
:root {
  --paper: #F7F4ED;        /* 宣纸 */
  --paper-2: #FFFDF8;      /* 素笺 */
  --ink: #1C1C1C;          /* 墨 */
  --ink-70: #454440;
  --ink-50: #6E6C66;
  --faint: #D8D2C4;        /* 淡墨 */
  --faint-2: #EAE5DA;
  --cinnabar: #A8322D;     /* 朱砂 */
  --cinnabar-dark: #8C2A26;
  --indigo: #2E4756;       /* 黛青 */
  --serif: "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;
  --container: 1120px;
  --ease: cubic-bezier(.22,.61,.36,1);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--serif);
  font-weight: 600;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: 3px;
  border-radius: 2px;
}
.container { max-width: var(--container); margin: 0 auto; padding: 0 32px; }
.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--ink); color: var(--paper); padding: 8px 16px; z-index: 99;
}
.skip-link:focus { left: 0; }

/* ============ 顶部导航 ============ */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(247, 244, 237, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--faint);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; padding: 18px 32px; max-width: var(--container); margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { width: 32px; height: 28px; flex: none; }
.brand-text { display: flex; flex-direction: column; line-height: 1.18; }
.brand-name i { font-style: normal; color: var(--cinnabar); }
.brand-name { font-family: var(--serif); font-weight: 700; font-size: 20px; letter-spacing: .12em; }
.brand-sub { font-size: 11px; color: var(--ink-50); letter-spacing: .28em; display: block; margin-top: -2px; font-weight: 400; }
.main-nav { display: flex; align-items: center; gap: 34px; font-size: 15px; }
.main-nav a:not(.nav-cta) { color: var(--ink-70); position: relative; padding: 4px 0; }
.main-nav a:not(.nav-cta)::after {
  content: ""; position: absolute; left: 0; bottom: -2px; width: 0; height: 2px;
  background: var(--cinnabar); transition: width .25s var(--ease);
}
.main-nav a:not(.nav-cta):hover { color: var(--ink); }
.main-nav a:not(.nav-cta):hover::after { width: 100%; }
.main-nav a:not(.nav-cta)[aria-current="page"] { color: var(--ink); }
.main-nav a:not(.nav-cta)[aria-current="page"]::after { width: 100%; }
.nav-cta {
  background: var(--cinnabar); color: #FFF7F2; padding: 9px 22px;
  border-radius: 2px; font-size: 14px; letter-spacing: .1em;
  transition: background-color .2s, transform .2s var(--ease);
}
.nav-cta:hover { background: var(--cinnabar-dark); transform: translateY(-1px); }

/* ============ Hero ============ */
.hero {
  position: relative; overflow: hidden;
  padding: 108px 0 150px;
  background:
    radial-gradient(1100px 480px at 82% -10%, rgba(46, 71, 86, .07), transparent 60%),
    radial-gradient(760px 420px at 8% 112%, rgba(168, 50, 45, .05), transparent 55%),
    var(--paper);
}
.hero-inner { position: relative; z-index: 2; display: grid; grid-template-columns: 1fr 300px; gap: 48px; align-items: center; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 13px; letter-spacing: .3em; color: var(--ink-50); margin-bottom: 26px;
}
.hero-eyebrow::before { content: ""; width: 36px; height: 1px; background: var(--faint); }
.hero h1 {
  font-family: var(--serif); font-weight: 900;
  font-size: clamp(38px, 5.6vw, 60px); line-height: 1.24; letter-spacing: .04em;
  margin-bottom: 24px; text-wrap: balance;
}
.hero h1 em { font-style: normal; color: var(--cinnabar); position: relative; }
.hero-sub {
  font-size: 17px; color: var(--ink-70); max-width: 560px;
  text-wrap: pretty; margin-bottom: 42px;
}
.hero-actions { display: flex; gap: 18px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 34px; font-size: 15px; letter-spacing: .12em;
  border-radius: 2px; transition: background-color .2s, color .2s, transform .2s var(--ease), border-color .2s;
}
.btn-primary { background: var(--cinnabar); color: #FFF7F2; }
.btn-primary:hover { background: var(--cinnabar-dark); transform: translateY(-2px); }
.btn-ghost { border: 1px solid var(--ink); color: var(--ink); background: transparent; }
.btn-ghost:hover { background: var(--ink); color: var(--paper); transform: translateY(-2px); }
.hero-aside { display: flex; justify-content: flex-end; align-items: center; gap: 28px; }
.hero-lamp { width: 200px; height: 200px; flex: none; }
.lamp-glow-tight { transform-origin: 100px 86px; }
.lamp-flame { transform-origin: 100px 96px; }
.lamp-ember { opacity: 0; }
@media (prefers-reduced-motion: no-preference) {
  .lamp-glow-tight { animation: lamp-breathe 5s ease-in-out infinite; }
  .lamp-flame { animation: lamp-sway 5.5s ease-in-out infinite; }
  .lamp-ember { animation: ember-rise 6s ease-out infinite; }
  .lamp-ember.e2 { animation-duration: 5s; animation-delay: 1.8s; }
  .lamp-ember.e3 { animation-duration: 7s; animation-delay: 3.4s; }
  .hero-lamp { animation: lamp-float 8s ease-in-out infinite; }
  .lamp-ring {
    animation: lamp-ring-spin 60s linear infinite;
    transform-box: fill-box; transform-origin: center;
  }
  @keyframes lamp-breathe { 0%, 100% { opacity: .55; transform: scale(.94); } 50% { opacity: 1; transform: scale(1.06); } }
  @keyframes lamp-sway { 0%, 100% { transform: rotate(-1.4deg); } 50% { transform: rotate(1.4deg); } }
  @keyframes ember-rise { 0% { transform: translateY(0); opacity: 0; } 18% { opacity: .75; } 100% { transform: translateY(-20px); opacity: 0; } }
  @keyframes lamp-float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-6px); } }
  @keyframes lamp-ring-spin { to { transform: rotate(360deg); } }
}
.hero-vertical {
  writing-mode: vertical-rl; font-family: var(--serif);
  font-size: 20px; letter-spacing: .5em; color: var(--ink-50);
  border-right: 1px solid var(--faint); padding-right: 18px; height: 300px;
}
.hero-mountains { position: absolute; left: 0; right: 0; bottom: -6px; z-index: 1; pointer-events: none; }
.hero-mountains svg { display: block; width: 100%; height: 210px; }

/* ============ 通用区块 ============ */
section { padding: 96px 0; }
.sec-head { display: flex; align-items: baseline; gap: 18px; margin-bottom: 56px; }
.sec-head .seal-dot {
  width: 11px; height: 11px; background: var(--cinnabar);
  border-radius: 2px; transform: rotate(45deg) translateY(-1px); flex: none; align-self: center;
}
.sec-head h2 {
  font-family: var(--serif); font-weight: 700;
  font-size: clamp(26px, 3.4vw, 34px); letter-spacing: .08em; text-wrap: balance;
}
.sec-head .sec-en { font-size: 12px; letter-spacing: .32em; color: var(--ink-50); margin-left: auto; white-space: nowrap; font-weight: 400; }

/* ============ 信任数字 ============ */
.trust { background: var(--paper-2); border-top: 1px solid var(--faint-2); border-bottom: 1px solid var(--faint-2); padding: 56px 0; }
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }
.trust-item { text-align: center; position: relative; }
.trust-item + .trust-item::before {
  content: ""; position: absolute; left: -16px; top: 50%; transform: translateY(-50%);
  width: 1px; height: 44px; background: var(--faint);
}
.trust-num {
  font-family: var(--serif); font-weight: 900; font-size: 42px; line-height: 1.1;
  color: var(--ink); font-variant-numeric: tabular-nums;
}
.trust-num sup { font-size: 20px; color: var(--cinnabar); margin-left: 2px; }
.trust-label { font-size: 14px; color: var(--ink-50); letter-spacing: .18em; margin-top: 8px; }

/* ============ 服务四条线 ============ */
.services-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.service-card {
  position: relative; background: var(--paper-2);
  border: 1px solid var(--faint); border-radius: 4px;
  padding: 34px 22px 26px; overflow: hidden;
  display: flex; flex-direction: column; gap: 14px;
  transition: border-color .25s, transform .25s var(--ease), box-shadow .25s;
}
.service-card:hover {
  border-color: var(--cinnabar); transform: translateY(-6px);
  box-shadow: 0 18px 40px -20px rgba(28, 28, 28, .25);
}
.service-index {
  font-family: var(--serif); font-weight: 900; font-size: 56px;
  color: transparent; -webkit-text-stroke: 1px var(--faint); line-height: 1;
  transition: color .25s;
}
.service-card:hover .service-index { color: var(--cinnabar); -webkit-text-stroke-color: var(--cinnabar); }
.service-card h3 { font-family: var(--serif); font-size: 19px; font-weight: 700; letter-spacing: .02em; }
.service-card p { font-size: 15px; color: var(--ink-70); flex: 1; }
.service-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.service-tags span {
  font-size: 12px; color: var(--indigo); background: rgba(46, 71, 86, .07);
  padding: 3px 12px; border-radius: 2px; letter-spacing: .06em;
}
.service-link {
  font-size: 14px; letter-spacing: .2em; color: var(--cinnabar);
  display: inline-flex; align-items: center; gap: 8px; margin-top: 6px;
}
.service-link::after { content: ""; position: absolute; inset: 0; }
.service-link .arrow { transition: transform .25s var(--ease); display: inline-block; }
.service-card:hover .service-link .arrow { transform: translateX(6px); }

/* ============ 案例 ============ */
.cases { background: var(--ink); color: var(--paper); }
.cases .sec-head h2 { color: var(--paper); }
.cases .sec-en { color: rgba(247, 244, 237, .45); }
.cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.case-card {
  position: relative;
  background: rgba(247, 244, 237, .04); border: 1px solid rgba(247, 244, 237, .14);
  border-radius: 4px; overflow: hidden;
  transition: border-color .25s, transform .25s var(--ease);
}
.case-card .case-cover-link::after { content: ""; position: absolute; inset: 0; z-index: 1; }
.case-card:hover { border-color: rgba(168, 50, 45, .8); transform: translateY(-6px); }
.case-art { aspect-ratio: 16 / 9; position: relative; overflow: hidden; }
.case-art img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.case-art svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.case-body { padding: 26px 26px 28px; display: flex; flex-direction: column; gap: 12px; }
.case-tag { font-size: 12px; letter-spacing: .22em; color: rgba(247, 244, 237, .55); }
.case-card h3 { font-family: var(--serif); font-size: 19px; font-weight: 700; letter-spacing: .03em; }
.case-metrics { display: flex; gap: 24px; margin-top: 6px; }
.case-metric b { font-family: var(--serif); font-size: 24px; font-weight: 700; color: #E8B4B0; font-variant-numeric: tabular-nums; display: block; line-height: 1.2; }
.case-metric span { font-size: 12px; color: rgba(247, 244, 237, .55); letter-spacing: .08em; }
.cases-more { margin-top: 48px; text-align: center; }
.btn-paper {
  border: 1px solid rgba(247, 244, 237, .4); color: var(--paper);
  padding: 12px 34px; display: inline-flex; gap: 10px; align-items: center;
  letter-spacing: .14em; font-size: 14px; border-radius: 2px;
  transition: background-color .2s, color .2s, border-color .2s;
}
.btn-paper:hover { background: var(--paper); color: var(--ink); border-color: var(--paper); }

/* ============ 文章 ============ */
.article-list { display: flex; flex-direction: column; }
.article-row {
  display: grid; grid-template-columns: 130px 1fr auto; gap: 32px; align-items: center;
  padding: 30px 8px; border-top: 1px solid var(--faint);
  transition: background-color .2s, padding-left .25s var(--ease);
}
.article-row:last-child { border-bottom: 1px solid var(--faint); }
.article-row:hover { background: var(--paper-2); padding-left: 20px; }
.article-date { font-size: 13px; color: var(--ink-50); font-variant-numeric: tabular-nums; letter-spacing: .06em; }
.article-row h3 { font-family: var(--serif); font-size: 19px; font-weight: 700; margin-bottom: 6px; }
.article-row p { font-size: 15px; color: var(--ink-50); }
.article-cat { font-size: 12px; color: var(--indigo); border: 1px solid rgba(46, 71, 86, .25); padding: 3px 12px; border-radius: 2px; letter-spacing: .15em; white-space: nowrap; }
.articles-more { margin-top: 36px; text-align: center; }

/* ============ 关于我预告 ============ */
.about { background: var(--paper-2); border-top: 1px solid var(--faint-2); }
.about-grid { display: grid; grid-template-columns: 420px 1fr; gap: 64px; align-items: center; }
.about-figure { display: flex; justify-content: center; }
.about-scroll {
  writing-mode: vertical-rl;
  background: var(--paper);
  border: 1px solid var(--faint);
  border-radius: 4px;
  padding: 48px 44px;
  height: 380px;
  box-shadow: 0 14px 36px -22px rgba(28, 28, 28, .3);
}
.scroll-text {
  display: block; font-family: "Ma Shan Zheng", var(--serif);
  font-size: 52px; font-weight: 400; letter-spacing: .26em;
  color: var(--ink); margin-left: 34px;
}
.about-text h2 { font-family: var(--serif); font-size: 30px; font-weight: 700; margin-bottom: 18px; letter-spacing: .05em; }
.about-text p { color: var(--ink-70); font-size: 15.5px; margin-bottom: 16px; max-width: 620px; }
.about-facts { display: flex; gap: 12px; flex-wrap: wrap; margin: 20px 0 30px; }
.about-facts span { font-size: 13px; color: var(--ink-70); background: var(--paper); border: 1px solid var(--faint); padding: 5px 14px; border-radius: 2px; }
.text-link { color: var(--cinnabar); letter-spacing: .18em; font-size: 14px; display: inline-flex; gap: 8px; align-items: center; border-bottom: 1px solid transparent; transition: border-color .2s; }
.text-link:hover { border-color: var(--cinnabar); }

/* ============ CTA 转化区 ============ */
.cta { position: relative; overflow: hidden; padding: 110px 0; background: var(--ink); }
.cta::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(800px 400px at 85% 20%, rgba(168, 50, 45, .16), transparent 60%);
}
.cta-inner { position: relative; z-index: 2; display: grid; grid-template-columns: 1fr auto; gap: 64px; align-items: center; }
.cta h2 { font-family: var(--serif); font-size: clamp(30px, 4vw, 42px); font-weight: 900; color: var(--paper); letter-spacing: .06em; margin-bottom: 18px; text-wrap: balance; }
.cta p { color: rgba(247, 244, 237, .65); font-size: 16px; max-width: 540px; margin-bottom: 38px; }
.qr-box {
  background: var(--paper); border-radius: 6px; padding: 20px;
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  box-shadow: 0 24px 60px -20px rgba(0, 0, 0, .55);
}
.qr-box svg, .qr-box img { width: 148px; height: 148px; display: block; }
.qr-box span { font-size: 13px; color: var(--ink-70); letter-spacing: .28em; }

/* ============ 页脚 ============ */
.site-footer { background: var(--paper); border-top: 1px solid var(--faint); padding: 64px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand p { font-size: 13.5px; color: var(--ink-50); margin-top: 14px; max-width: 340px; }
.footer-col h4 { font-size: 13px; letter-spacing: .3em; color: var(--ink-50); font-weight: 500; margin-bottom: 18px; }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.footer-col a, .footer-col li { font-size: 14px; color: var(--ink-70); }
.footer-col a:hover { color: var(--cinnabar); }
.footer-bottom {
  border-top: 1px solid var(--faint-2); padding-top: 24px;
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-size: 12.5px; color: var(--ink-50); letter-spacing: .06em;
}
.footer-bottom a { color: inherit; }
.footer-bottom a:hover { color: var(--cinnabar); }

/* 页脚微信二维码悬浮弹层 */
.wechat-li { position: relative; display: flex; align-items: center; gap: 6px; }
.qr-trigger {
  display: inline-flex; align-items: center; justify-content: center;
  width: 20px; height: 20px; padding: 0; border: none; background: none;
  color: var(--ink-50); cursor: pointer; border-radius: 2px;
}
.qr-trigger:hover { color: var(--cinnabar); }
.qr-trigger svg { width: 15px; height: 15px; display: block; }
.qr-pop {
  display: none; position: absolute; bottom: calc(100% + 12px); left: -14px;
  width: max-content; padding: 14px; z-index: 30;
  background: var(--paper-2); border: 1px solid var(--faint); border-radius: 6px;
  box-shadow: 0 18px 44px -16px rgba(28, 28, 28, .3);
}
.qr-pop::after {
  content: ""; position: absolute; top: 100%; left: 24px;
  border: 7px solid transparent; border-top-color: var(--faint);
}
.qr-pop img { width: 148px; height: 148px; display: block; border-radius: 4px; background: #FFF; }
.qr-pop > span { display: block; text-align: center; font-size: 12px; color: var(--ink-50); letter-spacing: .2em; margin-top: 10px; }
.wechat-li:hover .qr-pop, .wechat-li:focus-within .qr-pop { display: block; }

/* ============ 入场动画 ============ */
@media (prefers-reduced-motion: no-preference) {
  .hero-eyebrow, .hero h1, .hero-sub, .hero-actions, .hero-aside {
    opacity: 0; transform: translateY(22px);
    animation: rise .8s var(--ease) forwards;
  }
  .hero h1 { animation-delay: .1s; }
  .hero-sub { animation-delay: .2s; }
  .hero-actions { animation-delay: .3s; }
  .hero-aside { animation-delay: .42s; }
  @keyframes rise { to { opacity: 1; transform: none; } }
}

/* ============ 响应式 ============ */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; }
  /* 移动端首屏让位给 H1+副标+CTA，装饰灯整组隐藏 */
  .hero-aside { display: none; }
  .hero-vertical { display: none; }
  .services-grid, .cases-grid { grid-template-columns: 1fr 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .cta-inner { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .trust-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .trust-item:nth-child(3)::before { display: none; }
}
@media (max-width: 640px) {
  section { padding: 64px 0; }
  .container { padding: 0 20px; }
  .header-inner { flex-wrap: wrap; padding: 14px 20px; }
  .main-nav { gap: 18px; font-size: 14px; order: 3; width: 100%; justify-content: space-between; }
  .nav-cta { display: none; }
  .hero { padding: 72px 0 120px; }
  .services-grid, .cases-grid { grid-template-columns: 1fr; }
  .article-row { grid-template-columns: 1fr; gap: 8px; }
  .trust-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
}