/* ============================================================
   LARKBRO — 设计系统
   直接对标 tesla.cn/cybertruck（replicant-v2）
   单色灰 · 点阵底纹 · 中间凸起分割线 · 切角卡片 · 满幅图文
   全站无彩色，仅 logo 保留电光青
   ============================================================ */

/* ----------------------------- Reset ----------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--ct-bg);
  color: var(--ct-body);
  font-family: var(--f-body);
  font-size: var(--fs-40);
  line-height: var(--lh-40);
  letter-spacing: .005em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
h1, h2, h3, h4, h5, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font: inherit; border: 0; background: none; color: inherit; cursor: pointer; }
hr { border: 0; margin: 0; }
::selection { background: var(--ct-accent); color: #06222a; }

/* ----------------------------- Tokens ----------------------------- */
:root {
  /* 调色（照抄 Cybertruck replicant-v2） */
  --ct-bg:        #111111;
  --ct-bg-2:      #161616;
  --ct-body:      #8e8e8e;
  --ct-h1:        #c7c7c7;
  --ct-h2:        #a2a3a5;
  --ct-hi:        #e6e6e6;
  --ct-dim:       #5c5e62;
  --ct-line:      #393c41;
  --ct-line-soft: rgba(255, 255, 255, .07);
  --ct-faded:     hsla(0, 0%, 7%, .5);
  --ct-accent:     #00e5ff;             /* 电光青：关键词点缀 / logo 标识 */
  --ct-accent-dim: rgba(0, 229, 255, .42); /* 电光青：装裱刻度线（弱化） */

  /* 点阵底纹 */
  --dots: radial-gradient(#393c41 1px, transparent 0);

  /* 切角 */
  --notch: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  --notch-outline-thin: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 1.5px, 1.5px 1.5px, 1.5px calc(100% - 10px), 1.5px calc(100% - 10px), 1.5px calc(100% - 10px), 1.5px 1.5px, 0 1.5px);

  /* 字体 */
  --f-body: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --f-mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;

  /* 字号阶梯（Cybertruck） */
  --fs-10: 10px; --fs-20: 12px; --fs-30: 14px; --fs-40: 17px;
  --fs-50: 20px; --fs-55: 23px; --fs-60: 24px; --fs-70: 28px;
  --fs-75: 34px; --fs-80: 40px; --fs-90: 48px; --fs-100: 56px;
  /* 行高阶梯 */
  --lh-20: 20px; --lh-30: 20px; --lh-40: 24px; --lh-50: 28px;
  --lh-60: 28px; --lh-70: 36px; --lh-80: 48px; --lh-90: 56px;

  /* 间距基准 8px */
  --s-1: 8px;  --s-2: 16px; --s-3: 24px; --s-4: 32px;
  --s-5: 40px; --s-6: 48px; --s-7: 56px; --s-8: 64px;
  --s-10: 80px; --s-12: 96px; --s-15: 120px; --s-20: 160px;

  --wrap: 1200px;
  --pad-x: 32px;
  --sec-y: 120px;
  --sec-y-sm: 72px;
  --gutter: 24px;
}

@media (max-width: 1024px) { :root { --sec-y: 88px; --sec-y-sm: 56px; } }
@media (max-width: 640px)  { :root { --sec-y: 64px; --sec-y-sm: 48px; --pad-x: 20px; --gutter: 16px; } }

/* ----------------------------- Layout ----------------------------- */
.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: var(--pad-x); }
.wrap--narrow { max-width: 880px; }
.section {
  padding-block: var(--sec-y); position: relative;
  min-height: 100vh; min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
}
.section--tight { padding-block: var(--sec-y-sm); }
.section--flush { padding-block: 0; }

/* 点阵底纹（Cybertruck .tds-theme--replicant-dotted-bg） */
.dots {
  position: relative; z-index: 0;
  background-image: var(--dots);
  background-position: -20px -9px;
  background-size: 20px 20px;
}
.dots::before {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background-image: linear-gradient(180deg, transparent 0%, var(--ct-bg) 100%);
}
.dots > * { position: relative; }

/* 中间凸起分割线（Cybertruck .tds-theme--replicant-separator） */
.rule {
  height: 20px; width: 100%;
  background-color: var(--ct-line);
  clip-path: polygon(0 0, 37% 0, 39.5% 19px, 60% 19px, 62.5% 0, 100% 0, 100% 1px, 64% 1px, 64% 0, 62.5% 0, 62.5% 1px, 60% 20px, 39.5% 20px, 37% 1px, 1px 1px);
}

/* 细线 */
.hairline { height: 1px; background: var(--ct-line); }

/* 切角卡片 */
.notch { clip-path: var(--notch); }
.notch-frame {
  background: var(--ct-line);
  clip-path: var(--notch-outline-thin);
  padding: 1.5px;
}
.notch-frame > * { background: var(--ct-bg); clip-path: var(--notch); }

/* ----------------------------- Typography ----------------------------- */
.eyebrow {
  display: inline-block;
  font-family: var(--f-mono); font-size: var(--fs-20); font-weight: 500;
  letter-spacing: .18em; text-transform: uppercase; color: var(--ct-dim);
}
/* 装裱：eyebrow 前的电光青方标 */
.eyebrow::before {
  content: ""; display: inline-block; width: 6px; height: 6px;
  background: var(--ct-accent); margin-right: 10px; vertical-align: middle;
  transform: translateY(-1px);
}
.h-display {
  font-family: var(--f-body); font-weight: 500;
  font-size: clamp(2rem, 4.6vw, var(--fs-100)); line-height: 1.1;
  letter-spacing: -.015em; color: var(--ct-h1);
}
.h-section {
  font-family: var(--f-body); font-weight: 500;
  font-size: clamp(1.5rem, 3vw, var(--fs-80)); line-height: 1.18;
  letter-spacing: -.01em; color: var(--ct-h1);
}
.h-card { font-size: var(--fs-50); font-weight: 500; color: #d0d0d0; line-height: 1.3; }
.lead { color: var(--ct-body); font-size: var(--fs-40); line-height: 1.6; max-width: 62ch; }
.muted { color: var(--ct-body); }
.dim { color: var(--ct-dim); }
.accent { color: var(--ct-accent); }
.mono { font-family: var(--f-mono); letter-spacing: .14em; text-transform: uppercase; }

/* 板块标题（左侧细线 + 短标记线） */
.section-head {
  position: relative; max-width: 820px; margin-bottom: var(--s-8);
  padding-top: var(--s-3); border-top: 1px solid var(--ct-line);
}
.section-head::before {
  content: ""; position: absolute; top: -1px; left: 0;
  width: 56px; height: 1px; background: var(--ct-accent);
}
.section-head .eyebrow { margin-bottom: var(--s-3); }
.section-head p { margin-top: var(--s-2); }

/* ----------------------------- Buttons ----------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 12px 28px;
  font-family: var(--f-mono); font-size: var(--fs-20); font-weight: 500;
  letter-spacing: .16em; text-transform: uppercase;
  border: 1px solid transparent; border-radius: 0;
  transition: background .25s ease, color .25s ease, border-color .25s ease;
  white-space: nowrap;
}
.btn--primary { background: #e6e6e6; color: #111; }
.btn--primary:hover { background: #fff; }
.btn--ghost { border-color: var(--ct-line); color: var(--ct-h1); }
.btn--ghost:hover { border-color: var(--ct-body); color: var(--ct-hi); }
.btn--sm { padding: 9px 18px; font-size: var(--fs-10); }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: var(--s-4); }

/* ----------------------------- Header ----------------------------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 900;
  transition: background .35s ease, border-color .35s ease, padding .35s ease;
  border-bottom: 1px solid transparent;
  padding-block: 20px;
}
.site-header.is-scrolled {
  background: rgba(17, 17, 17, .88);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--ct-line);
  padding-block: 14px;
}
.site-header__inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; }

.brand { display: inline-flex; align-items: center; }
.brand__img { display: block; height: 30px; width: auto; }
.brand--lg .brand__img { height: 44px; }

.site-nav { display: flex; align-items: center; gap: 30px; }
.site-nav__link {
  font-family: var(--f-mono); font-size: var(--fs-20); font-weight: 500; letter-spacing: .14em;
  text-transform: uppercase; color: var(--ct-body);
  position: relative; padding-block: 4px; transition: color .25s ease;
}
.site-nav__link::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 1px; width: 0;
  background: var(--ct-hi); transition: width .3s ease;
}
.site-nav__link:hover, .site-nav__link.is-active { color: var(--ct-hi); }
.site-nav__link:hover::after, .site-nav__link.is-active::after { width: 100%; }
.site-nav__cta { margin-left: 8px; }

.site-nav-toggle { display: none; width: 38px; height: 32px; flex-direction: column; justify-content: center; gap: 5px; }
.site-nav-toggle span { display: block; height: 1px; background: var(--ct-hi); transition: transform .3s ease, opacity .3s ease; }
.site-nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.site-nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 900px) {
  .site-nav-toggle { display: flex; }
  .site-nav {
    position: fixed; inset: 0 0 0 auto; width: min(76vw, 320px);
    flex-direction: column; align-items: flex-start; justify-content: center; gap: 24px;
    background: var(--ct-bg-2); border-left: 1px solid var(--ct-line);
    padding: 40px 34px;
    transform: translateX(100%); transition: transform .4s cubic-bezier(.22,.61,.36,1);
  }
  .site-nav.is-open { transform: translateX(0); }
  .site-nav__link { font-size: var(--fs-30); }
  .site-nav__cta { margin-left: 0; margin-top: 10px; }
}

/* ----------------------------- 装裱（Framing） ----------------------------- */
/* 图片"装裱"：四角刻度（左上 / 右下），悬停时展开并点亮为电光青 */
.tile__media::before, .tile__media::after,
.pcard__media::before, .pcard__media::after,
.eco__media::before, .eco__media::after,
.deliver__media::before, .deliver__media::after,
.pscroll__media::before, .pscroll__media::after,
.split__media::before, .split__media::after {
  content: ""; position: absolute; z-index: 2; width: 16px; height: 16px;
  pointer-events: none; border: 0 solid var(--ct-accent-dim);
  transition: width .4s ease, height .4s ease, border-color .4s ease;
}
.tile__media::before, .pcard__media::before, .eco__media::before,
.deliver__media::before, .pscroll__media::before, .split__media::before {
  top: 10px; left: 10px; border-top-width: 1px; border-left-width: 1px;
}
.tile__media::after, .pcard__media::after, .eco__media::after,
.deliver__media::after, .pscroll__media::after, .split__media::after {
  bottom: 10px; right: 10px; border-bottom-width: 1px; border-right-width: 1px;
}
.split__media::before { width: 22px; height: 22px; top: 16px; left: 16px; }
.split__media::after { width: 22px; height: 22px; top: auto; bottom: 16px; right: 16px; }
.tile:hover .tile__media::before, .tile:hover .tile__media::after,
.pcard:hover .pcard__media::before, .pcard:hover .pcard__media::after {
  width: 24px; height: 24px; border-color: var(--ct-accent);
}

/* 文案"装裱"：内容块四角刻度，把文案像作品一样框起来 */
.deco { position: relative; padding: clamp(18px, 2.6vw, 34px); }
.deco::before, .deco::after {
  content: ""; position: absolute; z-index: 2; width: 24px; height: 24px;
  pointer-events: none; border: 0 solid var(--ct-accent-dim);
}
.deco::before { top: 0; left: 0; border-top-width: 1px; border-left-width: 1px; }
.deco::after { bottom: 0; right: 0; border-bottom-width: 1px; border-right-width: 1px; }

/* ----------------------------- Full-bleed block（满幅图文） ----------------------------- */
.fb {
  position: relative; isolation: isolate; overflow: hidden;
  min-height: 100vh; min-height: 100svh;
  display: flex; align-items: flex-end;
}
.fb--center { align-items: center; }
.fb--short { min-height: 100vh; min-height: 100svh; }
.fb__bg { position: absolute; inset: 0; z-index: -2; }
.fb__bg img {
  width: 100%; height: 100%; object-fit: cover;
  filter: grayscale(1) contrast(1.06) brightness(.66);
  transform: scale(1.02);
}
/* 产品封面图滚动视差：图片放大留出位移余量，随滚动小幅滞后平移 */
.fb[id^="showcase-"] .fb__bg img {
  transform: translateY(var(--py, 0%)) scale(1.18);
  will-change: transform;
}
@media (prefers-reduced-motion: reduce) {
  .fb[id^="showcase-"] .fb__bg img { transform: scale(1.02); will-change: auto; }
}
.fb::after {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background:
    linear-gradient(180deg, rgba(17,17,17,.55) 0%, rgba(17,17,17,.12) 42%, rgba(17,17,17,.94) 100%),
    linear-gradient(90deg, rgba(17,17,17,.62) 0%, rgba(17,17,17,0) 62%);
}
.fb__inner { width: 100%; padding-block: var(--s-12) var(--s-10); }
.fb__title {
  font-family: var(--f-body); font-weight: 500;
  font-size: clamp(2rem, 4.6vw, var(--fs-100)); line-height: 1.1;
  letter-spacing: -.015em; color: #dcdcdc;
}
.fb__title .accent { color: var(--ct-accent); }
/* 断句自适应：每个小段不可断行，仅在小段之间换行 */
.fit-seg { white-space: nowrap; }
/* 人为指定「不断行」的成组内容（配合 <wbr> 指定唯一折行点，保证断句位置） */
.nb { white-space: nowrap; }
.fb__sub { margin-top: var(--s-3); color: var(--ct-body); font-size: clamp(1rem, 1.4vw, var(--fs-40)); max-width: 56ch; line-height: 1.6; }
.fb__meta { display: flex; flex-wrap: wrap; gap: 10px 22px; margin-top: var(--s-3); font-family: var(--f-mono); font-size: var(--fs-20); letter-spacing: .14em; text-transform: uppercase; color: var(--ct-dim); }
.fb__meta em { font-style: normal; color: var(--ct-accent); margin-right: 6px; }
.fb__cta { margin-top: var(--s-4); }
.fb__code {
  display: block; font-family: var(--f-mono); font-size: var(--fs-20);
  letter-spacing: .24em; color: var(--ct-accent); margin-bottom: var(--s-3);
}
.fb__logo { display: block; }
.hero-logo { display: block; width: clamp(240px, 38vw, 440px); height: auto; }
.fb__inner--center { display: flex; flex-direction: column; align-items: center; text-align: center; }
.hero .fb__logo { margin-bottom: var(--s-5); }
.hero__title { letter-spacing: .01em; }

/* Hero 专用 */
.hero { position: sticky; top: 0; border-bottom: 1px solid var(--ct-line); }
.hero__scroll {
  position: absolute; left: 50%; bottom: 26px; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 14px;
  font-family: var(--f-mono); font-size: var(--fs-20); letter-spacing: .22em;
  color: var(--ct-body);
}
/* 三个向上箭头：明暗自下而上往复，暗示向上滑动 */
.hero__scroll-arrows { display: flex; flex-direction: column; align-items: center; gap: 3px; }
.hero__scroll-arrows i {
  width: 10px; height: 10px;
  border-top: 1px solid var(--ct-accent);
  border-left: 1px solid var(--ct-accent);
  transform: rotate(45deg);
  opacity: .2;
  animation: scrollUpPulse 1.8s ease-in-out infinite;
}
.hero__scroll-arrows i:nth-child(3) { animation-delay: 0s; }    /* 下：先亮 */
.hero__scroll-arrows i:nth-child(2) { animation-delay: .28s; }  /* 中 */
.hero__scroll-arrows i:nth-child(1) { animation-delay: .56s; }  /* 上：后亮 */
.hero__scroll-label { white-space: nowrap; }
@keyframes scrollUpPulse {
  0%, 100% { opacity: .2; }
  30%      { opacity: 1; }
  60%      { opacity: .2; }
}
@media (prefers-reduced-motion: reduce) {
  .hero__scroll-arrows i { animation: none; opacity: .55; }
}

/* ---------------- 滚动电影场：主张 → 黑幕 → 大提问 ---------------- */
/* hero 与电影场同属一个「覆盖区」：hero 钉住，下方内容向上覆盖；覆盖区结束后 hero 随之滚出 */
.hero-cover { position: relative; }
.cine {
  position: relative; z-index: 2;
  background: var(--ct-bg);
  height: 300vh;              /* 拉长滚动：整段电影约 2 屏滚动时长 */
}
.cine__stage {
  position: sticky; top: 0;
  height: 100vh; height: 100svh;
  overflow: hidden;
  display: grid; grid-template-columns: minmax(0, 1fr); place-items: center;
}
.cine__lay {
  grid-area: 1 / 1;
  width: 100%; max-width: var(--wrap);
  margin-inline: auto; padding-inline: var(--pad-x);
}
.cine__lay--intro { z-index: 0; }
.cine__veil {                 /* 黑幕：逐渐覆盖原内容 */
  position: absolute; inset: 0; z-index: 1;
  background: #0b0b0b; opacity: 0; pointer-events: none;
}
.cine__lay--q {               /* 纯色背景上的大大白色文字 */
  z-index: 2; opacity: 0; text-align: center; pointer-events: none;
}
.cine__big {
  font-family: var(--f-body); font-weight: 500;
  font-size: clamp(2.1rem, 6.6vw, 4.8rem);
  line-height: 1.16; letter-spacing: -.02em; color: #fff;
}
@media (prefers-reduced-motion: reduce) {
  .hero { position: static; }
  .cine { height: auto; }
  .cine__stage {
    position: static; height: auto; min-height: 100svh;
    display: flex; flex-direction: column; justify-content: center;
    gap: var(--s-12); padding-block: var(--sec-y);
  }
  .cine__lay { grid-area: auto; }
  .cine__veil { display: none; }
  .cine__lay--q { opacity: 1; }
}

/* 元信息横栏 */
.meta-rail { display: flex; flex-wrap: wrap; margin-top: var(--s-5); border-top: 1px solid var(--ct-line); max-width: 720px; }
.meta-rail li {
  flex: 1 1 120px; padding: var(--s-2) var(--s-3) 0 0; border-right: 1px solid var(--ct-line);
  font-family: var(--f-mono); font-size: var(--fs-20); letter-spacing: .12em; text-transform: uppercase; color: var(--ct-body);
}
.meta-rail li:last-child { border-right: 0; }
.meta-rail li b { display: block; color: var(--ct-dim); font-weight: 500; margin-bottom: 6px; }
@media (max-width: 640px) {
  .meta-rail li { flex-basis: 33.33%; border-right: 0; padding-right: 12px; }
}

/* ----------------------------- Split block（左图右文 / 交替） ----------------------------- */
.split { display: grid; grid-template-columns: 1fr 1fr; align-items: stretch; }
.split--media-wide { grid-template-columns: 1.25fr 1fr; }
.split--reverse .split__media { order: 2; }
.split__media { position: relative; overflow: hidden; min-height: clamp(380px, 46vw, 640px); background: #0b0b0b; }
.split__media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; filter: grayscale(1) contrast(1.05) brightness(.72); }
.split__body { display: flex; flex-direction: column; justify-content: center; padding: clamp(40px, 5.5vw, 96px); }
.split__body .h-section { margin-top: var(--s-2); }
.split__body .lead { margin-top: var(--s-3); }
@media (max-width: 900px) {
  .split, .split--media-wide { grid-template-columns: 1fr; }
  .split--reverse .split__media { order: 0; }
  .split__media { min-height: 300px; }
}

/* ----------------------------- Tile（图文卡片） ----------------------------- */
.grid { display: grid; gap: var(--gutter); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--5 { grid-template-columns: repeat(5, 1fr); }
@media (max-width: 1100px) { .grid--5 { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 1024px) { .grid--4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 860px) { .grid--2, .grid--3 { grid-template-columns: 1fr; } }
@media (max-width: 720px) { .grid--5 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .grid--4, .grid--5 { grid-template-columns: 1fr; } }

.tile { display: flex; flex-direction: column; }
.tile__media { position: relative; overflow: hidden; aspect-ratio: 4 / 3; background: #0b0b0b; }
.tile__media--tall { aspect-ratio: 3 / 4; }
.tile__media img {
  width: 100%; height: 100%; object-fit: cover;
  filter: grayscale(1) contrast(1.05) brightness(.72);
  transition: transform 1.1s cubic-bezier(.22,.61,.36,1), filter .6s ease;
}
.tile:hover .tile__media img { transform: scale(1.045); filter: grayscale(1) contrast(1.05) brightness(.9); }
.tile__body { padding: var(--s-3) 0 0; }
.tile__idx { font-family: var(--f-mono); font-size: var(--fs-20); letter-spacing: .2em; color: var(--ct-accent); }
.tile h3 { margin: var(--s-2) 0 var(--s-1); }
.tile p { color: var(--ct-body); font-size: var(--fs-30); line-height: 1.6; }
.tile__line { height: 1px; background: var(--ct-line); margin-top: var(--s-3); }

/* 产品矩阵卡（带角标 + 链接） */
.pcard { display: flex; flex-direction: column; }
.pcard__media { position: relative; overflow: hidden; aspect-ratio: 4 / 3; background: #0b0b0b; }
.pcard__media img {
  width: 100%; height: 100%; object-fit: cover;
  filter: grayscale(1) contrast(1.05) brightness(.7);
  transition: transform 1.1s cubic-bezier(.22,.61,.36,1), filter .6s ease;
}
.pcard:hover .pcard__media img { transform: scale(1.045); filter: grayscale(1) contrast(1.05) brightness(.88); }
.pcard__top {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: var(--s-3) 0 var(--s-2); border-bottom: 1px solid var(--ct-line);
}
.pcard__code { font-family: var(--f-mono); font-size: var(--fs-20); letter-spacing: .22em; color: var(--ct-accent); }
.pcard__type { font-family: var(--f-mono); font-size: var(--fs-10); letter-spacing: .12em; color: var(--ct-body); border: 1px solid var(--ct-line); padding: 5px 10px; white-space: nowrap; }
.pcard__name { font-weight: 500; font-size: var(--fs-60); color: #d0d0d0; margin: var(--s-3) 0 var(--s-1); }
.pcard__name small { display: block; font-family: var(--f-mono); font-size: var(--fs-10); font-weight: 500; letter-spacing: .3em; color: var(--ct-dim); margin-top: 8px; }
.pcard__tagline { font-size: var(--fs-40); color: var(--ct-h2); font-weight: 500; }
.pcard__summary { color: var(--ct-body); font-size: var(--fs-30); line-height: 1.6; margin-top: var(--s-2); flex: 1; }
.pcard__link {
  font-family: var(--f-mono); font-size: var(--fs-20); font-weight: 500; letter-spacing: .14em;
  color: var(--ct-hi); display: inline-flex; align-items: center; gap: 10px;
  margin-top: var(--s-3); padding-top: var(--s-3); border-top: 1px solid var(--ct-line);
}
.pcard__link .arw { color: var(--ct-accent); transition: transform .3s ease; }
.pcard:hover .pcard__link .arw { transform: translateX(5px); }

/* ----------------------------- Split media 内的图文列表 ----------------------------- */
.hl { display: grid; border-top: 1px solid var(--ct-line); margin-top: var(--s-4); }
.hl__item { display: grid; grid-template-columns: 84px 1fr; gap: var(--s-3); padding: var(--s-3) 0; border-bottom: 1px solid var(--ct-line); align-items: start; }
.hl__thumb { width: 84px; aspect-ratio: 1 / 1; overflow: hidden; background: #0b0b0b; }
.hl__thumb img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(1) contrast(1.05) brightness(.75); }
.hl__body { display: grid; grid-template-columns: auto 1fr; gap: var(--s-2); }
.hl__idx { font-family: var(--f-mono); font-size: var(--fs-30); letter-spacing: .14em; color: var(--ct-accent); }
.hl__body h4 { font-size: var(--fs-40); font-weight: 500; color: #cfcfcf; margin-bottom: 6px; }
.hl__body p { color: var(--ct-body); font-size: var(--fs-30); line-height: 1.6; }

/* ----------------------------- 产品详解：滚动切图（Pin & Swap） ----------------------------- */
.pscroll { --stage-top: 92px; }
.pscroll__grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 4.5vw, 80px); align-items: start; }
.pscroll__grid--reverse .pscroll__stage { order: 2; }

/* 舞台：4:3 图 + 标题，随滚动钉在视口中线 */
.pscroll__stage { position: sticky; top: var(--stage-top); align-self: start; min-width: 0; }
.pscroll__head { margin-bottom: var(--s-4); }
/* 详解板块的产品名（邻客 / 友赞 / 有伴）放大提亮，便于识别 */
.pscroll__head .eyebrow { font-size: var(--fs-40); letter-spacing: .14em; color: var(--ct-h1); }
.pscroll__head .h-section { margin-top: var(--s-2); }

.pscroll__media { position: relative; overflow: hidden; aspect-ratio: 4 / 3; background: #0b0b0b; }
.pscroll__img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
  opacity: 0; transform: scale(1.06);
  filter: grayscale(1) contrast(1.05) brightness(.5);
  transition: opacity .75s cubic-bezier(.22,.61,.36,1), transform 1.2s cubic-bezier(.22,.61,.36,1), filter .75s ease;
}
.pscroll__img.is-active { opacity: 1; transform: scale(1); filter: grayscale(1) contrast(1.05) brightness(.88); }

/* 子项目：桌面端文字驱动列表，放大 / 提亮强调当前项 */
.pscroll__list { display: grid; min-width: 0; }
.pscroll__item { min-height: clamp(300px, 58vh, 620px); display: flex; align-items: center; border-bottom: 1px solid var(--ct-line); }
.pscroll__item:first-child { border-top: 1px solid var(--ct-line); }
.pscroll__item-inner {
  width: 100%; opacity: .38; transform: scale(.95); transform-origin: left center;
  filter: brightness(.72);
  transition: opacity .55s ease, transform .7s cubic-bezier(.22,.61,.36,1), filter .55s ease;
}
.pscroll__item.is-active .pscroll__item-inner { opacity: 1; transform: none; filter: none; }
.pscroll__item h4 { font-size: clamp(1.35rem, 2.2vw, var(--fs-75)); font-weight: 500; color: #d0d0d0; line-height: 1.25; margin: var(--s-2) 0 var(--s-2); }
.pscroll__item p { color: var(--ct-body); font-size: var(--fs-40); line-height: 1.7; max-width: 42ch; }
.pscroll__idx { font-family: var(--f-mono); font-size: var(--fs-20); letter-spacing: .24em; color: var(--ct-dim); transition: color .5s ease; }
.pscroll__item.is-active .pscroll__idx,
.pscroll__slide.is-active .pscroll__idx { color: var(--ct-accent); }

/* 横向解说条：移动端专用 */
.pscroll__rail { display: none; }
.pscroll__track { display: flex; align-items: center; }
.pscroll__slide { flex: 0 0 auto; }

@media (max-width: 900px) {
  .pscroll { --stage-top: 72px; }
  /* 舞台与列表同格：让 sticky 的包含块变高，钉住才生效 */
  .pscroll__grid { grid-template-columns: 1fr; gap: 0; }
  .pscroll__grid--reverse .pscroll__stage { order: 0; }
  .pscroll__stage { grid-area: 1 / 1; }
  .pscroll__list { grid-area: 1 / 1; pointer-events: none; }

  .pscroll__head { margin-bottom: var(--s-3); }

  /* 驱动列表在移动端只留滚动高度：每个详解占满一屏，避免一划跳过多个 */
  .pscroll__item { min-height: 100vh; min-height: 100svh; border: 0; }
  .pscroll__item-inner { display: none; }

  .pscroll__rail {
    display: block; position: relative; overflow: hidden;
    margin-inline: calc(var(--pad-x) * -1);
    margin-top: var(--s-4);
  }
  .pscroll__track { gap: var(--s-3); width: max-content; transition: transform .7s cubic-bezier(.22,.61,.36,1); }
  .pscroll__slide {
    width: 74vw; opacity: .38; transform: scale(.86); transform-origin: center;
    filter: brightness(.7);
    transition: opacity .55s ease, transform .7s cubic-bezier(.22,.61,.36,1), filter .55s ease;
  }
  .pscroll__slide.is-active { opacity: 1; transform: scale(1); filter: none; }
  .pscroll__slide h4 { font-size: var(--fs-60); font-weight: 500; color: #d0d0d0; margin: var(--s-2) 0 6px; }
  .pscroll__slide p { color: var(--ct-body); font-size: var(--fs-30); line-height: 1.6; }
}

/* 详解板块 → 下一个封面：详解舞台保持钉住，下一封面向上滑入覆盖（复用 hero 的覆盖动效）。
   仅当详解之后紧跟满幅封面（.fb）时才追加一屏钉住高度；否则（如区别点详解 → 交付方式）正常衔接。 */
.pscroll:has(+ .fb) .pscroll__list { padding-bottom: 100vh; padding-bottom: 100svh; }
.pscroll + .fb { z-index: 2; margin-top: -100vh; margin-top: -100svh; }

@media (prefers-reduced-motion: reduce) {
  .pscroll__img, .pscroll__item-inner, .pscroll__track, .pscroll__slide { transition: none; }
  .pscroll:has(+ .fb) .pscroll__list { padding-bottom: 0; }
  .pscroll + .fb { margin-top: 0; }
}

/* ----------------------------- Anchor subnav ----------------------------- */
.subnav {
  position: sticky; top: 60px; z-index: 800;
  background: rgba(17, 17, 17, .9); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--ct-line); border-bottom: 1px solid var(--ct-line);
}
.subnav__inner { display: flex; align-items: center; gap: 4px; overflow-x: auto; padding-block: 12px; scrollbar-width: none; }
.subnav__inner::-webkit-scrollbar { display: none; }
.subnav a {
  font-family: var(--f-mono); font-size: var(--fs-20); font-weight: 500; letter-spacing: .16em; text-transform: uppercase;
  color: var(--ct-body); padding: 8px 16px; border: 1px solid transparent; white-space: nowrap;
  transition: color .25s ease, border-color .25s ease;
}
.subnav a:hover, .subnav a.is-active { color: var(--ct-hi); border-color: var(--ct-line); }

/* ----------------------------- 三品合一 / 初心 ----------------------------- */
.statement { padding-top: var(--s-3); border-top: 1px solid var(--ct-line); position: relative; }
.statement::before { content: ""; position: absolute; top: -1px; left: 0; width: 56px; height: 1px; background: var(--ct-accent); }
.statement__quote {
  font-weight: 500; font-size: clamp(1.5rem, 3vw, var(--fs-75));
  line-height: 1.35; letter-spacing: -.01em; color: var(--ct-h1); margin-top: var(--s-3); max-width: 22ch;
}
.statement__quote .accent { color: var(--ct-accent); }
.statement p.lead { margin-top: var(--s-3); }

.rail { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: var(--s-5); border-top: 1px solid var(--ct-line); }
@media (max-width: 720px) { .rail { grid-template-columns: 1fr; } }
.rail li { padding: var(--s-3) var(--s-3) var(--s-3) 0; border-right: 1px solid var(--ct-line); }
.rail li:last-child { border-right: 0; }
@media (max-width: 720px) { .rail li { border-right: 0; border-bottom: 1px solid var(--ct-line); } .rail li:last-child { border-bottom: 0; } }
.rail b { display: block; font-size: var(--fs-50); font-weight: 500; color: #d0d0d0; margin-bottom: 6px; }
.rail span { font-family: var(--f-mono); font-size: var(--fs-20); letter-spacing: .1em; color: var(--ct-body); }

/* 居中排版块（用于满幅覆盖文案） */
.center-head {
  max-width: 900px; margin-inline: auto; text-align: center;
  display: flex; flex-direction: column; align-items: center;
}
.center-head .fb__meta { justify-content: center; }
.center-block { max-width: 760px; }
.center-block--mid { margin-inline: auto; text-align: center; }
.center-block__rail { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--s-3) var(--s-5); margin-top: var(--s-4); }
.center-block__rail li { font-family: var(--f-mono); font-size: var(--fs-20); letter-spacing: .14em; text-transform: uppercase; color: var(--ct-body); }
.center-block__rail b { color: var(--ct-hi); font-weight: 500; }

/* ----------------------------- Stat band（100 主播） ----------------------------- */
.stat-band { display: grid; grid-template-columns: minmax(190px, auto) 1fr; gap: var(--s-10); align-items: center; }
@media (max-width: 860px) { .stat-band { grid-template-columns: 1fr; gap: var(--s-5); } }
.stat-band__num {
  font-weight: 500; line-height: .9; color: var(--ct-accent);
  font-size: clamp(3.6rem, 8vw, 6.5rem);
  padding-left: var(--s-3); border-left: 1px solid var(--ct-accent-dim);
}
.stat-band__num small { display: block; font-family: var(--f-mono); font-size: var(--fs-20); font-weight: 500; letter-spacing: .18em; color: var(--ct-body); margin-top: var(--s-3); text-transform: uppercase; }
.stat-band__body .h-section { margin: var(--s-2) 0 var(--s-2); }
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: var(--s-3); }
.chip { font-family: var(--f-mono); font-size: var(--fs-10); font-weight: 500; letter-spacing: .14em; color: var(--ct-body); border: 1px solid var(--ct-line); border-left: 2px solid var(--ct-accent); padding: 7px 13px; }

/* ----------------------------- Ecosystem ----------------------------- */
.eco { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--gutter); }
@media (max-width: 860px) { .eco { grid-template-columns: 1fr; } }
.eco__node { position: relative; }
.eco__media { position: relative; overflow: hidden; aspect-ratio: 16 / 10; background: #0b0b0b; }
.eco__media img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(1) contrast(1.05) brightness(.72); }
.eco__node strong { display: block; font-size: var(--fs-55); font-weight: 500; color: #d0d0d0; margin: var(--s-3) 0 6px; }
.eco__node span { font-family: var(--f-mono); font-size: var(--fs-10); letter-spacing: .26em; color: var(--ct-body); }
.eco__node p { color: var(--ct-body); font-size: var(--fs-30); margin-top: var(--s-2); padding-top: var(--s-2); border-top: 1px solid var(--ct-line); line-height: 1.6; }

/* ----------------------------- Delivery ----------------------------- */
.deliver__media { position: relative; overflow: hidden; aspect-ratio: 16 / 9; background: #0b0b0b; }
.deliver__media img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(1) contrast(1.05) brightness(.7); }
.deliver__card h3 { font-size: var(--fs-55); font-weight: 500; color: #d0d0d0; margin: var(--s-3) 0 var(--s-2); }
.deliver__card p { color: var(--ct-body); font-size: var(--fs-30); line-height: 1.6; }
.deliver__card ul { margin-top: var(--s-3); border-top: 1px solid var(--ct-line); }
.deliver__card li { padding: 11px 0 11px 22px; position: relative; color: var(--ct-body); font-size: var(--fs-30); border-bottom: 1px solid var(--ct-line); }
.deliver__card li::before { content: ""; position: absolute; left: 0; top: 20px; width: 10px; height: 1px; background: var(--ct-accent); }
.deliver__note { margin-top: var(--s-3); color: var(--ct-h2); font-size: var(--fs-30); font-family: var(--f-mono); line-height: 1.7; }

/* ----------------------------- CTA ----------------------------- */
.cta { max-width: 720px; }
.cta .h-section { margin-top: var(--s-2); }
.cta p { margin-top: var(--s-3); }

/* ----------------------------- Product detail（产品页） ----------------------------- */
.pdetail__grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-10); align-items: start; }
@media (max-width: 980px) { .pdetail__grid { grid-template-columns: 1fr; gap: var(--s-6); } }
.pdetail__code { font-family: var(--f-mono); font-size: var(--fs-20); letter-spacing: .24em; color: var(--ct-accent); }
.pdetail__name { font-weight: 500; font-size: clamp(1.9rem, 3.6vw, var(--fs-80)); letter-spacing: -.01em; color: var(--ct-h1); margin: var(--s-2) 0 6px; }
.pdetail__en { font-family: var(--f-mono); font-size: var(--fs-20); font-weight: 500; letter-spacing: .32em; color: var(--ct-body); margin-bottom: var(--s-3); }
.pdetail__type { display: inline-block; font-family: var(--f-mono); font-size: var(--fs-10); letter-spacing: .16em; color: var(--ct-body); border: 1px solid var(--ct-line); padding: 6px 12px; margin-bottom: var(--s-3); }
.pdetail__tagline { font-size: clamp(1.1rem, 1.8vw, var(--fs-55)); font-weight: 500; line-height: 1.5; color: var(--ct-h2); margin-bottom: var(--s-2); }
.pdetail__summary { color: var(--ct-body); margin-bottom: var(--s-5); line-height: 1.65; }
.pdetail__note { margin-top: var(--s-3); padding: var(--s-2) var(--s-3); border-left: 1px solid var(--ct-body); background: var(--ct-faded); color: var(--ct-body); font-size: var(--fs-30); line-height: 1.65; }
.pdetail__audience { margin-top: var(--s-3); font-family: var(--f-mono); font-size: var(--fs-20); color: var(--ct-dim); letter-spacing: .06em; line-height: 1.7; }

/* ----------------------------- Reveal ----------------------------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s cubic-bezier(.22,.61,.36,1), transform .7s cubic-bezier(.22,.61,.36,1); }
.reveal.is-in { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: .06s; }
.reveal[data-delay="2"] { transition-delay: .12s; }
.reveal[data-delay="3"] { transition-delay: .18s; }
.reveal[data-delay="4"] { transition-delay: .24s; }
.reveal[data-delay="5"] { transition-delay: .3s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ----------------------------- Motion FX ----------------------------- */
/* 大板块：对焦扫描线 → 由中心横线纵向展开 */
.reveal.fx-scan { opacity: 1; transform: none; }
.fx-scan { position: relative; }
.fx-scan__line {
  position: absolute; left: 0; right: 0; top: 50%; height: 1px; z-index: 3;
  background: linear-gradient(90deg, transparent, var(--ct-hi) 12%, var(--ct-hi) 88%, transparent);
  transform: scaleX(0); transform-origin: left center; opacity: 0; pointer-events: none;
}
.fx-scan.is-in .fx-scan__line { animation: fxScanline .8s cubic-bezier(.22, .61, .36, 1) both; }
@keyframes fxScanline {
  0%   { transform: scaleX(0); opacity: 0; }
  10%  { opacity: 1; }
  68%  { transform: scaleX(1); opacity: 1; }
  100% { transform: scaleX(1); opacity: 0; }
}
.fx-scan__body { clip-path: inset(50% -2px 50% -2px); transition: clip-path .85s cubic-bezier(.22, .61, .36, 1) .34s; }
.reveal.fx-scan.is-in .fx-scan__body { clip-path: inset(-2px -2px -2px -2px); }

/* 并排小卡片：自下向上浮出 + 渐显 */
.reveal.fx-flip { opacity: 0; }
.reveal.fx-flip.is-in { animation: fxRise .72s cubic-bezier(.22, .61, .36, 1) both; }
@keyframes fxRise {
  from { opacity: 0; transform: translateY(32px); }
  to   { opacity: 1; transform: translateY(0); }
}
.reveal.fx-flip[data-delay="1"] { animation-delay: .08s; }
.reveal.fx-flip[data-delay="2"] { animation-delay: .16s; }
.reveal.fx-flip[data-delay="3"] { animation-delay: .24s; }
.reveal.fx-flip[data-delay="4"] { animation-delay: .32s; }
.reveal.fx-flip[data-delay="5"] { animation-delay: .4s; }

@media (prefers-reduced-motion: reduce) {
  .reveal.fx-flip, .reveal.fx-flip.is-in { opacity: 1; transform: none; animation: none; }
  .fx-scan__line { display: none; }
  .fx-scan__body, .reveal.fx-scan.is-in .fx-scan__body { clip-path: none; }
}

/* ----------------------------- Footer ----------------------------- */
.site-footer { border-top: 1px solid var(--ct-line); background: var(--ct-bg); padding-block: var(--s-10) var(--s-4); }
.site-footer__top { display: grid; grid-template-columns: 1.7fr 1fr 1fr 1fr; gap: var(--s-5); }
@media (max-width: 900px) { .site-footer__top { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .site-footer__top { grid-template-columns: 1fr; } }
.site-footer__brand .brand { margin-bottom: var(--s-3); }
.site-footer__slogan { font-size: var(--fs-40); font-weight: 500; color: var(--ct-h2); margin-bottom: 12px; }
.site-footer__desc { color: var(--ct-body); font-size: var(--fs-30); max-width: 40ch; line-height: 1.6; }
.site-footer__col h4 { font-family: var(--f-mono); font-size: var(--fs-10); font-weight: 500; letter-spacing: .24em; text-transform: uppercase; color: var(--ct-dim); margin-bottom: var(--s-2); }
.site-footer__col li { color: var(--ct-body); font-size: var(--fs-30); padding: 5px 0; }
.site-footer__col a:hover { color: var(--ct-hi); }
.site-footer__bottom {
  margin-top: var(--s-7); padding-top: var(--s-3); border-top: 1px solid var(--ct-line);
  display: flex; flex-wrap: wrap; gap: 10px 28px; justify-content: space-between;
  font-family: var(--f-mono); color: var(--ct-dim); font-size: var(--fs-10); letter-spacing: .06em;
}

/* ----------------------------- Utilities ----------------------------- */
.center { text-align: center; }
.mt-3 { margin-top: var(--s-3); }
.mt-4 { margin-top: var(--s-4); }
.mt-5 { margin-top: var(--s-5); }
.pt-hedge { padding-top: 170px; }