/* ==========================================================================
   闫宝龙 · GEO 优化 — Design System
   风格定位：Editorial Ink Tech（报刊式墨色 + 现代商务）
   ========================================================================== */

:root {
  /* —— 颜色 —— */
  --ink-1000: #0F1117;       /* 主墨色 */
  --ink-900:  #15181F;
  --ink-800:  #1B1F27;
  --ink-700:  #262A33;
  --ink-600:  #3A3F4A;
  --ink-500:  #5B606C;
  --ink-400:  #8A8F9A;
  --ink-300:  #B5B9C2;
  --ink-200:  #D8DBE0;
  --ink-100:  #ECEEF1;

  --paper:    #F6F2E9;       /* 米白纸张 */
  --paper-2:  #FAF7EF;
  --paper-3:  #EFEADA;

  --gold-700: #8B6F3F;
  --gold-600: #A48352;
  --gold-500: #B89968;       /* 主金色 */
  --gold-300: #D8C49A;
  --gold-100: #EFE5CC;

  --cinnabar: #7A2E1F;       /* 朱砂红（节制使用） */
  --cinnabar-2: #A33E2B;

  --line:     rgba(15,17,23,0.10);
  --line-2:   rgba(15,17,23,0.18);
  --line-on-dark: rgba(255,255,255,0.10);
  --line-on-dark-2: rgba(255,255,255,0.18);

  /* —— 字体 —— */
  --f-display: "Noto Serif SC", "Source Han Serif SC", "STSong", "SimSun", "宋体", serif;
  --f-body:    "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", sans-serif;
  --f-mono:    "JetBrains Mono", "SF Mono", "Menlo", "Consolas", monospace;

  /* —— 字号 —— */
  --fs-hero:   clamp(2.6rem, 6.5vw, 5.6rem);
  --fs-h2:     clamp(1.8rem, 3.2vw, 2.8rem);
  --fs-h3:     1.25rem;
  --fs-body:   16px;
  --fs-small:  14px;
  --fs-mini:   12px;

  /* —— 间距 —— */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;
  --s-8: 64px;
  --s-9: 96px;
  --s-10: 128px;

  /* —— 容器 —— */
  --max-w: 1240px;
  --gutter: clamp(16px, 4vw, 40px);

  /* —— 动效 —— */
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --t-fast: 180ms;
  --t-med:  360ms;
  --t-slow: 720ms;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--f-body);
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--ink-900);
  background: var(--paper-2);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1, "liga" 1;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { margin: 0; font-family: var(--f-display); font-weight: 700; letter-spacing: -0.01em; }
p { margin: 0; }
sup { font-size: 0.5em; vertical-align: super; }

/* ===== Container ===== */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ==========================================================================
   导航
   ========================================================================== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 64px;
  background: rgba(246, 242, 233, 0.55);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: background var(--t-med) var(--ease), border-color var(--t-med) var(--ease);
}
.nav.is-scrolled {
  background: rgba(246, 242, 233, 0.92);
  border-bottom-color: var(--line);
}
.nav__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-5);
}

/* Logo */
.logo {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink-1000);
  letter-spacing: 0.01em;
  white-space: nowrap;
}
.logo__r {
  color: var(--gold-600);
  font-size: 0.6em;
  margin-left: 1px;
  font-family: var(--f-mono);
  font-weight: 500;
}
.logo__sep {
  color: var(--ink-300);
  font-weight: 400;
  margin: 0 2px;
}
.logo__sub {
  font-family: var(--f-mono);
  font-size: 0.78em;
  font-weight: 500;
  color: var(--gold-700);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.logo--light { color: var(--paper); }
.logo--light .logo__sub { color: var(--gold-300); }
.logo--light .logo__sep { color: rgba(255,255,255,0.35); }
.logo--light .logo__r { color: var(--gold-300); }

/* Menu */
.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--s-6);
}
.nav__menu a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink-800);
  position: relative;
  padding: 6px 0;
  transition: color var(--t-fast) var(--ease);
}
.nav__menu a:hover { color: var(--gold-600); }
.nav__menu a:not(.nav__cta)::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: var(--gold-500);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-med) var(--ease);
}
.nav__menu a:not(.nav__cta):hover::after { transform: scaleX(1); }
.nav__cta {
  background: var(--ink-1000);
  color: var(--paper) !important;
  padding: 8px 18px !important;
  border-radius: 2px;
  transition: background var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.nav__cta:hover { background: var(--gold-600); color: var(--paper) !important; transform: translateY(-1px); }
.nav__cta::after { display: none; }

/* Burger */
.nav__burger {
  display: none;
  width: 40px; height: 40px;
  background: transparent;
  border: 1px solid var(--line-2);
  border-radius: 2px;
  padding: 0;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}
.nav__burger span {
  width: 18px; height: 1.5px;
  background: var(--ink-900);
  transition: transform var(--t-med) var(--ease), opacity var(--t-fast) var(--ease);
}
.nav__burger.is-open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav__burger.is-open span:nth-child(2) { opacity: 0; }
.nav__burger.is-open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.nav__drawer {
  display: none;
  position: fixed;
  top: 64px; left: 0; right: 0;
  background: var(--paper-2);
  border-bottom: 1px solid var(--line);
  padding: var(--s-4) var(--gutter);
  flex-direction: column;
  gap: var(--s-3);
  transform: translateY(-110%);
  transition: transform var(--t-med) var(--ease);
  z-index: 99;
}
.nav__drawer.is-open { transform: translateY(0); }
.nav__drawer a {
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 1rem;
  color: var(--ink-800);
}
.nav__drawer a:last-child { border-bottom: none; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  padding: 120px 0 0;
  background: var(--ink-1000);
  color: var(--paper);
  overflow: hidden;
  isolation: isolate;
}
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}
.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 35%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 35%, #000 30%, transparent 80%);
}
.hero__glow {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 50% at 18% 28%, rgba(184,153,104,0.18), transparent 60%),
    radial-gradient(50% 40% at 85% 18%, rgba(122,46,31,0.18), transparent 65%),
    radial-gradient(70% 60% at 50% 95%, rgba(184,153,104,0.10), transparent 70%);
}
.hero__noise {
  position: absolute;
  inset: 0;
  opacity: 0.06;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 0.7 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  mix-blend-mode: overlay;
}

.hero__inner {
  position: relative;
  padding: var(--s-9) 0 var(--s-9);
}
.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  border: 1px solid var(--line-on-dark-2);
  border-radius: 100px;
  font-family: var(--f-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--gold-300);
  text-transform: uppercase;
  margin-bottom: var(--s-6);
  animation: fadeUp 0.9s var(--ease) 0.1s both;
}
.hero__eyebrow .dot {
  width: 6px; height: 6px;
  background: var(--gold-500);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--gold-500);
  animation: pulse 2.4s var(--ease) infinite;
}
@keyframes pulse {
  0%,100% { opacity: 1; transform: scale(1); }
  50%     { opacity: 0.6; transform: scale(0.8); }
}

.hero__title {
  font-family: var(--f-display);
  font-size: var(--fs-hero);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 var(--s-5);
  animation: fadeUp 1s var(--ease) 0.2s both;
}
.hero__title-line {
  display: block;
}
.hero__title-zh { display: inline-block; }
.hero__title-accent {
  display: inline-block;
  color: var(--gold-500);
  font-style: italic;
  margin: 0 0.25em;
  position: relative;
  padding: 0 0.05em;
}
.hero__title-accent::before {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0.12em;
  height: 8px;
  background: linear-gradient(90deg, rgba(184,153,104,0.32), transparent);
  z-index: -1;
}

.hero__sub {
  max-width: 640px;
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.8;
  color: rgba(255,255,255,0.7);
  margin-bottom: var(--s-7);
  animation: fadeUp 1s var(--ease) 0.35s both;
}

.hero__cta {
  display: flex;
  gap: var(--s-4);
  flex-wrap: wrap;
  margin-bottom: var(--s-9);
  animation: fadeUp 1s var(--ease) 0.5s both;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 2px;
  border: 1px solid transparent;
  transition: all var(--t-med) var(--ease);
  cursor: pointer;
  white-space: nowrap;
}
.btn--primary {
  background: var(--gold-500);
  color: var(--ink-1000);
  font-weight: 600;
}
.btn--primary:hover { background: var(--gold-300); transform: translateY(-2px); box-shadow: 0 12px 28px -10px rgba(184,153,104,0.5); }
.btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: var(--line-on-dark-2);
}
.btn--ghost:hover { background: rgba(255,255,255,0.06); border-color: var(--gold-500); color: var(--gold-300); }

.hero__meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line-on-dark);
  border: 1px solid var(--line-on-dark);
  border-radius: 2px;
  overflow: hidden;
  max-width: 720px;
  animation: fadeUp 1s var(--ease) 0.65s both;
}
.hero__meta-item {
  background: var(--ink-1000);
  padding: var(--s-5) var(--s-4);
}
.hero__meta-item .num {
  font-family: var(--f-display);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--gold-500);
  line-height: 1;
  margin-bottom: 6px;
}
.hero__meta-item .num span {
  font-size: 0.6em;
  color: var(--gold-300);
  margin-left: 1px;
}
.hero__meta-item .lab {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.6);
  letter-spacing: 0.04em;
}

/* Ticker */
.hero__ticker {
  position: relative;
  border-top: 1px solid var(--line-on-dark);
  border-bottom: 1px solid var(--line-on-dark);
  background: rgba(0,0,0,0.25);
  overflow: hidden;
  padding: 14px 0;
  font-family: var(--f-mono);
  font-size: 0.85rem;
  color: var(--gold-300);
  letter-spacing: 0.08em;
}
.ticker__track {
  display: flex;
  gap: var(--s-5);
  white-space: nowrap;
  animation: ticker 30s linear infinite;
  padding-left: var(--s-5);
}
.ticker__track span { flex-shrink: 0; }
@keyframes ticker {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ==========================================================================
   通用 section
   ========================================================================== */
.section {
  padding: var(--s-9) 0;
  position: relative;
}
.section--alt { background: var(--paper); }
.section--dark {
  background: var(--ink-1000);
  color: var(--paper);
  position: relative;
  overflow: hidden;
}
.section--dark::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: linear-gradient(180deg, transparent, #000 30%, #000 70%, transparent);
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 30%, #000 70%, transparent);
  pointer-events: none;
}

.section__head {
  max-width: 760px;
  margin-bottom: var(--s-8);
}
.section__head--left { margin-left: 0; }

.kicker {
  display: inline-flex;
  align-items: baseline;
  gap: var(--s-2);
  margin-bottom: var(--s-4);
  font-family: var(--f-mono);
  font-size: 0.78rem;
  color: var(--gold-600);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.kicker span {
  font-family: var(--f-display);
  font-size: 0.9rem;
  color: var(--ink-1000);
  font-weight: 700;
}
.kicker em {
  font-style: normal;
  color: var(--ink-500);
}
.kicker--light span { color: var(--gold-300); }
.kicker--light em { color: rgba(255,255,255,0.5); }

.section__title {
  font-size: var(--fs-h2);
  line-height: 1.2;
  color: var(--ink-1000);
  margin-bottom: var(--s-4);
}
.section--dark .section__title { color: var(--paper); }
.section__lede {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--ink-500);
  max-width: 640px;
}
.section__lede--light { color: rgba(255,255,255,0.7); }

/* ==========================================================================
   服务卡片
   ========================================================================== */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 2px;
  overflow: hidden;
}
.card {
  position: relative;
  background: var(--paper-2);
  padding: var(--s-6) var(--s-5);
  transition: background var(--t-med) var(--ease), transform var(--t-med) var(--ease);
  display: flex;
  flex-direction: column;
  min-height: 280px;
}
.card::after {
  content: "";
  position: absolute;
  left: 0; top: 0;
  width: 0; height: 2px;
  background: var(--gold-500);
  transition: width var(--t-med) var(--ease);
}
.card:hover { background: var(--paper); transform: translateY(-2px); }
.card:hover::after { width: 100%; }
.card__no {
  font-family: var(--f-mono);
  font-size: 0.78rem;
  color: var(--ink-400);
  letter-spacing: 0.1em;
  margin-bottom: var(--s-4);
}
.card h3 {
  font-family: var(--f-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink-1000);
  margin-bottom: var(--s-3);
  line-height: 1.35;
}
.card p {
  font-size: 0.95rem;
  color: var(--ink-500);
  line-height: 1.7;
  margin-bottom: var(--s-4);
  flex: 1;
}
.card__list {
  border-top: 1px dashed var(--line-2);
  padding-top: var(--s-3);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.card__list li {
  font-size: 0.85rem;
  color: var(--ink-700);
  position: relative;
  padding-left: 16px;
}
.card__list li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.6em;
  width: 6px; height: 1px;
  background: var(--gold-500);
}

/* ==========================================================================
   适用场景
   ========================================================================== */
.scenes {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s-4);
}
.scene {
  background: var(--paper-2);
  border: 1px solid var(--line);
  padding: var(--s-5) var(--s-5) var(--s-6);
  border-radius: 2px;
  transition: all var(--t-med) var(--ease);
  position: relative;
}
.scene:hover {
  border-color: var(--gold-500);
  transform: translateY(-3px);
  box-shadow: 0 16px 32px -16px rgba(15,17,23,0.18);
}
.scene__tag {
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--gold-700);
  text-transform: uppercase;
  padding: 3px 8px;
  background: var(--gold-100);
  border-radius: 2px;
  margin-bottom: var(--s-3);
}
.scene h3 {
  font-size: 1.0625rem;
  color: var(--ink-1000);
  margin-bottom: var(--s-2);
}
.scene p {
  font-size: 0.9rem;
  color: var(--ink-500);
  line-height: 1.65;
}

/* ==========================================================================
   方法论 steps
   ========================================================================== */
.steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 2px;
  overflow: hidden;
  counter-reset: step;
}
.step {
  background: var(--paper-2);
  padding: var(--s-6) var(--s-5);
  position: relative;
  transition: background var(--t-med) var(--ease);
}
.step:hover { background: var(--paper); }
.step__no {
  font-family: var(--f-mono);
  font-size: 0.78rem;
  color: var(--gold-600);
  letter-spacing: 0.1em;
  margin-bottom: var(--s-3);
}
.step h3 {
  font-size: 1.05rem;
  color: var(--ink-1000);
  margin-bottom: var(--s-2);
  line-height: 1.4;
}
.step p {
  font-size: 0.875rem;
  color: var(--ink-500);
  line-height: 1.65;
}

/* ==========================================================================
   关于闫宝龙
   ========================================================================== */
.about {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) 1.4fr;
  gap: var(--s-9);
  align-items: start;
  position: relative;
  z-index: 1;
}
.about__media { position: relative; }
.about__frame {
  position: relative;
  border: 1px solid var(--line-on-dark-2);
  padding: 8px;
  background: linear-gradient(180deg, rgba(255,255,255,0.04), transparent);
  border-radius: 2px;
  overflow: hidden;
}
.about__frame img {
  width: 100%;
  aspect-ratio: 4/5;
  object-fit: cover;
  filter: grayscale(0.1) contrast(1.02);
  transition: transform 1.2s var(--ease), filter 1.2s var(--ease);
}
.about__frame:hover img { transform: scale(1.02); filter: grayscale(0) contrast(1.05); }
.about__stamp {
  position: absolute;
  bottom: 20px;
  right: 20px;
  width: 64px;
  padding: 10px 6px;
  border: 1.5px solid var(--cinnabar);
  color: var(--cinnabar);
  font-family: var(--f-display);
  font-size: 1rem;
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.2em;
  line-height: 1.2;
  background: rgba(15,17,23,0.6);
  backdrop-filter: blur(4px);
  border-radius: 2px;
  writing-mode: vertical-rl;
}
.about__caption {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  margin-top: var(--s-4);
}
.cap-line { width: 28px; height: 1px; background: var(--gold-500); }
.cap-text {
  font-family: var(--f-mono);
  font-size: 0.82rem;
  color: var(--gold-300);
  letter-spacing: 0.1em;
}

.about__body { color: var(--paper); }
.about__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line-on-dark);
  border: 1px solid var(--line-on-dark);
  border-radius: 2px;
  overflow: hidden;
  margin: var(--s-5) 0 var(--s-6);
}
.ab-item {
  background: var(--ink-1000);
  padding: var(--s-5);
}
.ab-item__no {
  font-family: var(--f-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--gold-500);
  line-height: 1;
  margin-bottom: 4px;
}
.ab-item__lab {
  font-family: var(--f-mono);
  font-size: 0.72rem;
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: var(--s-2);
}
.ab-item p {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
  line-height: 1.65;
}
.about__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.about__tags li {
  font-size: 0.8rem;
  color: var(--paper);
  padding: 5px 12px;
  border: 1px solid var(--line-on-dark-2);
  border-radius: 100px;
  transition: all var(--t-fast) var(--ease);
}
.about__tags li:hover { border-color: var(--gold-500); color: var(--gold-300); }

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq {
  border-top: 1px solid var(--line);
}
.faq__item {
  border-bottom: 1px solid var(--line);
  transition: background var(--t-fast) var(--ease);
}
.faq__item[open] { background: var(--paper); }
.faq__item summary {
  list-style: none;
  cursor: pointer;
  padding: var(--s-5) 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
  user-select: none;
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item .q {
  font-family: var(--f-display);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--ink-1000);
  flex: 1;
}
.faq__item[open] .q { color: var(--gold-700); }
.faq__item .ic {
  width: 24px; height: 24px;
  position: relative;
  flex-shrink: 0;
}
.faq__item .ic::before,
.faq__item .ic::after {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  width: 14px; height: 1.5px;
  background: var(--ink-700);
  transform: translate(-50%, -50%);
  transition: transform var(--t-med) var(--ease), background var(--t-fast) var(--ease);
}
.faq__item .ic::after { transform: translate(-50%, -50%) rotate(90deg); }
.faq__item[open] .ic::before { background: var(--gold-500); }
.faq__item[open] .ic::after { transform: translate(-50%, -50%) rotate(0deg); background: var(--gold-500); }

.faq__item .a {
  padding: 0 0 var(--s-5);
  color: var(--ink-500);
  font-size: 0.95rem;
  line-height: 1.85;
  max-width: 920px;
}

/* ==========================================================================
   联系
   ========================================================================== */
.contact {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--s-8);
  align-items: start;
}
.contact__list {
  margin-top: var(--s-5);
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 2px;
  overflow: hidden;
}
.contact__list li {
  background: var(--paper-2);
  padding: var(--s-4) var(--s-5);
  display: grid;
  grid-template-columns: 120px 1fr;
  align-items: center;
  gap: var(--s-4);
  transition: background var(--t-fast) var(--ease);
}
.contact__list li:hover { background: var(--paper); }
.contact__list .lab {
  font-family: var(--f-mono);
  font-size: 0.78rem;
  color: var(--ink-500);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.contact__list .val {
  font-family: var(--f-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink-1000);
  letter-spacing: 0.01em;
  transition: color var(--t-fast) var(--ease);
}
a.val:hover { color: var(--gold-700); }

.qr-card {
  background: var(--ink-1000);
  color: var(--paper);
  border: 1px solid var(--line-on-dark-2);
  padding: var(--s-6);
  border-radius: 2px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.qr-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 50% at 50% 0%, rgba(184,153,104,0.18), transparent 60%);
  pointer-events: none;
}
.qr-card__title {
  font-family: var(--f-display);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 4px;
  position: relative;
}
.qr-card__sub {
  font-family: var(--f-mono);
  font-size: 0.78rem;
  color: rgba(255,255,255,0.55);
  letter-spacing: 0.08em;
  margin-bottom: var(--s-5);
  position: relative;
}
.qr-card__img {
  display: inline-block;
  padding: 12px;
  background: var(--paper);
  border-radius: 2px;
  margin-bottom: var(--s-3);
  position: relative;
}
.qr-card__img img {
  width: 220px; height: 220px;
  display: block;
}
.qr-card__foot {
  font-family: var(--f-mono);
  font-size: 0.78rem;
  color: var(--gold-300);
  letter-spacing: 0.08em;
  position: relative;
}

/* ==========================================================================
   底部
   ========================================================================== */
.footer {
  background: var(--ink-1000);
  color: var(--paper);
  padding-top: var(--s-9);
  border-top: 1px solid var(--line-on-dark);
}
.footer__inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: var(--s-7);
  padding-bottom: var(--s-9);
  border-bottom: 1px solid var(--line-on-dark);
}
.footer__brand .logo { margin-bottom: var(--s-4); }
.footer__desc {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.55);
  line-height: 1.7;
  max-width: 280px;
}
.footer__col h4 {
  font-family: var(--f-display);
  font-size: 0.95rem;
  color: var(--paper);
  margin-bottom: var(--s-4);
  font-weight: 700;
  letter-spacing: 0.02em;
  position: relative;
  padding-bottom: 10px;
}
.footer__col h4::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 24px; height: 1.5px;
  background: var(--gold-500);
}
.footer__col ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer__col a {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.6);
  transition: color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
  display: inline-block;
}
.footer__col a:hover { color: var(--gold-300); padding-left: 4px; }

.footer__contact li {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 12px;
  font-size: 0.875rem;
  color: rgba(255,255,255,0.7);
}
.footer__contact span:first-child {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  color: rgba(255,255,255,0.4);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.footer__contact a:hover { color: var(--gold-300); }

.footer__legal {
  padding: var(--s-5) 0;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.45);
}
.footer__legal-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--s-4);
  flex-wrap: wrap;
}
.footer__legal a {
  color: rgba(255,255,255,0.55);
  margin: 0 6px;
  transition: color var(--t-fast) var(--ease);
}
.footer__legal a:hover { color: var(--gold-300); }
.beian {
  display: flex;
  align-items: center;
  gap: var(--s-4);
  flex-wrap: wrap;
}
.beian a { display: inline-flex; align-items: center; gap: 4px; }

/* Back to top */
.back-top {
  position: fixed;
  right: 20px; bottom: 20px;
  width: 44px; height: 44px;
  background: var(--ink-1000);
  color: var(--paper);
  border: 1px solid var(--line-on-dark-2);
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: all var(--t-med) var(--ease);
  z-index: 90;
}
.back-top.is-show { opacity: 1; transform: translateY(0); pointer-events: auto; }
.back-top:hover { background: var(--gold-500); color: var(--ink-1000); border-color: var(--gold-500); }

/* ==========================================================================
   动效
   ========================================================================== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}
.reveal.is-in {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  .ticker__track { animation: none; }
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1024px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .scenes { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(3, 1fr); }
  .steps .step:nth-child(4),
  .steps .step:nth-child(5) { grid-column: span 1; }
  .about { grid-template-columns: 1fr; gap: var(--s-7); }
  .about__media { max-width: 480px; }
  .contact { grid-template-columns: 1fr; }
  .footer__inner { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav__menu { display: none; }
  .nav__burger { display: flex; }
  .nav__drawer { display: flex; }
  .hero { padding-top: 90px; }
  .hero__meta { grid-template-columns: repeat(2, 1fr); }
  .hero__title { font-size: 2.4rem; }
  .section { padding: var(--s-8) 0; }
  .cards { grid-template-columns: 1fr; }
  .scenes { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .footer__inner { grid-template-columns: 1fr; gap: var(--s-6); }
  .footer__legal-inner { flex-direction: column; align-items: flex-start; }
  .contact__list li { grid-template-columns: 1fr; gap: 4px; padding: var(--s-3) var(--s-4); }
  .qr-card__img img { width: 180px; height: 180px; }
  .back-top { right: 14px; bottom: 14px; }
}

@media (max-width: 480px) {
  .hero__cta { flex-direction: column; }
  .hero__cta .btn { width: 100%; justify-content: center; }
  .hero__title-accent { -webkit-text-stroke-width: 1px; }
}