/* 思源黑体 Noto Sans SC — 自托管子集（官网 1111 字，~620KB/4 字重；替代 Google Fonts CDN，国内可达） */
@font-face{font-family:'Noto Sans SC';font-style:normal;font-weight:400;font-display:swap;src:url('fonts/noto-sans-sc-400.woff2') format('woff2');}
@font-face{font-family:'Noto Sans SC';font-style:normal;font-weight:500;font-display:swap;src:url('fonts/noto-sans-sc-500.woff2') format('woff2');}
@font-face{font-family:'Noto Sans SC';font-style:normal;font-weight:700;font-display:swap;src:url('fonts/noto-sans-sc-700.woff2') format('woff2');}
@font-face{font-family:'Noto Sans SC';font-style:normal;font-weight:900;font-display:swap;src:url('fonts/noto-sans-sc-900.woff2') format('woff2');}
/* ============================================================
   狂械司 KXS 官网 design-v2 — Claude V1
   设计方向：精密仪器 · 黑白叙事
   ⛔ 铁律：仅 nav(页头)+footer(页脚) 黑底；中间所有 section 一律白/浅灰，零黑底。
   全屏色块叙事靠 白↔浅灰 交替 + 大留白 + 大字 + 产品图阴影 制造节奏（apple.com.cn/ipad 式）。
   红 #DC211D 仅作小面积 accent（数字/CTA/eyebrow/图标），绝不做大面积背景。
   字号 6 级 / Bento Grid / 三端响应 1024·768·767
   ============================================================ */

/* ---------- 设计令牌 ---------- */
:root {
  --c-nav: #1d1d1f;            /* 炭黑：仅 nav / footer */
  --c-ink: #1d1d1f;            /* 主文字 */
  --c-bg: #ffffff;
  --c-alt: #f5f5f7;            /* 浅灰 section */
  --c-soft: #fafafa;           /* 更浅灰 */
  --c-tint: #f7f3f3;           /* 极浅暖灰（氛围色块，仍属灰白系） */
  --c-muted: #6e6e73;
  --c-subtle: #86868b;
  --c-line: #d2d2d7;
  --c-line-soft: #e8e8ed;
  --c-red: #DC211D;            /* 三叉戟红 / CTA / 强调（小面积） */
  --c-red-dark: #B81A17;
  --c-red-soft: rgba(220,33,29,.08);
  --c-tmall: #00aaff;
  --c-jd: #e1251b;
  --c-pdd: #e02e24;
  --c-on-dark: rgba(255,255,255,.92);
  --c-on-dark-mute: rgba(255,255,255,.62);
  --c-on-dark-faint: rgba(255,255,255,.62);

  /* 字号 6 级（桌面达上限 display96/h1 64/h2 48/h3 28/lead20/body16） */
  --t-display: clamp(52px, 7vw, 96px);
  --t-h1: clamp(38px, 6vw, 64px);
  --t-h2: clamp(30px, 4.4vw, 48px);
  --t-h3: clamp(22px, 2.3vw, 28px);
  --t-lead: clamp(17px, 1.5vw, 20px);
  --t-body: 16px;
  --t-caption: 13px;
  --t-ui: 15px;       /* UI 文字（nav/btn/正文小字）*/
  --t-label: 14px;    /* 次级标签 */
  --t-micro: 12px;    /* 微型标签 */

  --lh-tight: 1.03;
  --lh-head: 1.14;
  --lh-body: 1.72;

  --s1:4px; --s2:8px; --s3:12px; --s4:16px; --s5:24px;
  --s6:32px; --s7:48px; --s8:64px; --s9:96px; --s10:128px;

  --container: 1200px;
  --gutter: clamp(20px, 5vw, 64px);
  --nav-h: 72px;

  --r-sm: 12px; --r: 20px; --r-lg: 32px; --r-pill: 999px;

  --shadow-card: 0 1px 2px rgba(0,0,0,.04), 0 14px 36px rgba(29,29,31,.08);
  --shadow-float: 0 28px 64px rgba(29,29,31,.16);
  --drop-product: drop-shadow(0 32px 46px rgba(0,0,0,.20));

  --ease: cubic-bezier(.22,.61,.36,1);
  --ease-out: cubic-bezier(.16,1,.3,1);
  --dur: .5s;
  --dur-fast: .22s;

  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  --font-display: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", ui-monospace, "Roboto Mono", Menlo, monospace;
  color-scheme: light;
}

/* ---------- reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  font-family: var(--font); font-size: var(--t-body); line-height: var(--lh-body);
  color: var(--c-ink); background: var(--c-bg);
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden; font-feature-settings: "tnum" 1, "kern" 1;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }
:focus-visible { outline: 2px solid var(--c-red); outline-offset: 3px; border-radius: 4px; }

/* ---------- 排版 ---------- */
.display { font-size: var(--t-display); line-height: var(--lh-tight); font-weight: 800; letter-spacing: -.02em; }
.h1 { font-size: var(--t-h1); line-height: var(--lh-head); font-weight: 800; letter-spacing: -.018em; }
/* 思源黑体：标题更统一有设计感，正文保持系统黑体 */
.display, .h1, .h2, .h3, .stage__title, .bento__big, .hero__tagline { font-family: var(--font-display); }
.h2 { font-size: var(--t-h2); line-height: var(--lh-head); font-weight: 800; letter-spacing: -.015em; }
.h3 { font-size: var(--t-h3); line-height: 1.25; font-weight: 700; letter-spacing: -.01em; }
.lead { font-size: var(--t-lead); line-height: 1.55; color: var(--c-muted); font-weight: 400; }
.eyebrow { font-size: var(--t-caption); font-weight: 700; letter-spacing: .16em; text-transform: uppercase; color: var(--c-red); }
.eyebrow--mute { color: var(--c-subtle); }
.num { font-variant-numeric: tabular-nums; font-feature-settings: "tnum" 1; }

/* ---------- 容器 / 布局 ---------- */
.wrap { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: clamp(72px, 11vw, 140px); }
.section--tight { padding-block: clamp(56px, 8vw, 96px); }
.section--alt { background: var(--c-alt); }
.section--soft { background: var(--c-soft); }
.section-head { max-width: 760px; margin-bottom: clamp(40px, 6vw, 72px); }
.section-head .lead { margin-top: var(--s5); }
.center { text-align: center; }
.center.section-head { margin-inline: auto; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 50px; padding: 0 28px; border-radius: var(--r-pill);
  font-weight: 700; font-size: var(--t-body); letter-spacing: .01em;
  transition: transform var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn--primary { background: var(--c-ink); color: #fff; }
.btn--primary:hover { background: #000; }
.btn--accent { background: var(--c-red); color: #fff; }
.btn--accent:hover { background: var(--c-red-dark); }
.btn--ghost { border: 1.5px solid var(--c-line); color: var(--c-ink); background: transparent; }
.btn--ghost:hover { border-color: var(--c-ink); }
.btn--on-dark { background: #fff; color: var(--c-ink); }
.btn--ghost-dark { border: 1.5px solid rgba(255,255,255,.32); color: #fff; }
.btn--ghost-dark:hover { border-color: #fff; }
.btn--sm { min-height: 42px; padding: 0 20px; font-size: var(--t-ui); }
.btn--lg { min-height: 56px; padding: 0 36px; font-size: 17px; }
.link-arrow { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; color: var(--c-red); }
.link-arrow svg { transition: transform var(--dur-fast) var(--ease); }
.link-arrow:hover svg { transform: translateX(4px); }

/* ============================================================
   NAV（黑底 sticky）— 唯一允许的黑底区之一
   ============================================================ */
.nav { position: sticky; top: 0; z-index: 100; background: var(--c-nav); color: #fff; height: var(--nav-h); display: flex; align-items: center; border-bottom: 1px solid rgba(255,255,255,.08); }
.nav__inner { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); display: flex; align-items: center; gap: var(--s6); }
.brand { display: flex; align-items: center; gap: 10px; line-height: 0; flex-shrink: 0; }
.brand__mark { height: 56px; width: auto; }      /* LOGO mark:wordmark = 2:1 */
.brand__word { height: 28px; width: auto; }
.nav__links { display: flex; align-items: center; gap: clamp(20px, 2.4vw, 40px); margin-left: auto; }
.nav__link { font-size: var(--t-ui); font-weight: 600; color: var(--c-on-dark); position: relative; padding-block: 6px; transition: color var(--dur-fast); }
.nav__link:hover { color: #fff; }
.nav__link::after { content:""; position:absolute; left:0; right:0; bottom:-2px; height:2px; background: var(--c-red); transform: scaleX(0); transform-origin: left; transition: transform var(--dur-fast) var(--ease); }
.nav__link:hover::after, .nav__link[aria-current="page"]::after { transform: scaleX(1); }
.nav__cta { display: flex; align-items: center; gap: var(--s4); }
/* 官方旗舰店 — 融入主导航（与 nav__link 同款字体 + hover 红下划线）*/
.nav__store { position: relative; }
.nav__store::after { content: ""; position: absolute; top: 100%; left: -12px; right: -12px; height: 14px; }
.nav__store-btn { display: inline-flex; align-items: center; gap: 5px; padding-block: 6px; font-size: var(--t-ui); font-weight: 600; color: var(--c-on-dark); cursor: pointer; position: relative; transition: color var(--dur-fast); }
.nav__store:hover .nav__store-btn, .nav__store:focus-within .nav__store-btn, .nav__store.is-open .nav__store-btn { color: #fff; }
.nav__store-btn::after { content: ""; position: absolute; left: 0; right: 16px; bottom: -2px; height: 2px; background: var(--c-red); transform: scaleX(0); transform-origin: left; transition: transform var(--dur-fast) var(--ease); }
.nav__store:hover .nav__store-btn::after, .nav__store:focus-within .nav__store-btn::after { transform: scaleX(1); }
.nav__store-caret { width: 11px; height: 11px; opacity: .85; transition: transform var(--dur-fast) var(--ease); }
.nav__store:hover .nav__store-caret, .nav__store.is-open .nav__store-caret { transform: rotate(180deg); }
.nav__store-menu { position: absolute; top: calc(100% + 12px); left: 0; min-width: 190px; background: #fff; border: 1px solid var(--c-line-soft); border-radius: var(--r); box-shadow: var(--shadow-float); padding: 7px; opacity: 0; visibility: hidden; transform: translateY(-8px); transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease), visibility 0s linear var(--dur-fast); z-index: 120; }
.nav__store:hover .nav__store-menu, .nav__store:focus-within .nav__store-menu, .nav__store.is-open .nav__store-menu { opacity: 1; visibility: visible; transform: none; transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease), visibility 0s; }
.nav__store-item { display: flex; align-items: center; gap: 10px; padding: 9px 12px; border-radius: 10px; font-size: var(--t-label); font-weight: 500; color: var(--c-ink); transition: background var(--dur-fast); }
.nav__store-item:hover { background: var(--c-alt); }
.nav__store-ico { width: 22px; height: 22px; border-radius: 5px; flex-shrink: 0; object-fit: cover; }
/* 主导航 mega menu — 苹果式产品大字下拉（hover 品类展开该系列产品）*/
.nav__mega { position: relative; }
.nav__mega::after { content: ""; position: absolute; top: 100%; left: -14px; right: -14px; height: 16px; }   /* hover bridge 盖 btn↔panel 间隙 */
.nav__mega-btn { display: inline-flex; align-items: center; gap: 5px; padding-block: 6px; font-family: inherit; font-size: var(--t-ui); font-weight: 600; color: var(--c-on-dark); cursor: pointer; position: relative; transition: color var(--dur-fast); }
.nav__mega-btn::after { content: ""; position: absolute; left: 0; right: 16px; bottom: -2px; height: 2px; background: var(--c-red); transform: scaleX(0); transform-origin: left; transition: transform var(--dur-fast) var(--ease); }
.nav__mega:hover .nav__mega-btn, .nav__mega:focus-within .nav__mega-btn, .nav__mega.is-open .nav__mega-btn { color: #fff; }
.nav__mega:hover .nav__mega-btn::after, .nav__mega:focus-within .nav__mega-btn::after, .nav__mega.is-open .nav__mega-btn::after,
.nav__mega.is-current .nav__mega-btn::after { transform: scaleX(1); }   /* 当前栏目常显红下划线（替代原 aria-current）*/
.nav__mega-caret { width: 11px; height: 11px; opacity: .85; transition: transform var(--dur-fast) var(--ease); }
.nav__mega:hover .nav__mega-caret, .nav__mega.is-open .nav__mega-caret { transform: rotate(180deg); }
.nav__mega-panel { position: absolute; top: calc(100% + 14px); left: 0; min-width: 300px; background: #fff; border: 1px solid var(--c-line-soft); border-radius: var(--r); box-shadow: var(--shadow-float); padding: 26px 30px 22px; opacity: 0; visibility: hidden; transform: translateY(-10px); transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility 0s linear var(--dur); z-index: 120; }
.nav__mega:hover .nav__mega-panel, .nav__mega:focus-within .nav__mega-panel, .nav__mega.is-open .nav__mega-panel { opacity: 1; visibility: visible; transform: none; transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility 0s; }
.nav__mega-eyebrow { font-size: var(--t-micro); font-weight: 600; color: var(--c-muted); letter-spacing: .04em; margin: 0 0 16px; }
.nav__mega-link { display: block; font-size: 24px; font-weight: 600; line-height: 1.32; color: var(--c-ink); padding: 4px 0; transition: color var(--dur-fast); }
.nav__mega-link:hover { color: var(--c-red); }
.nav__toggle { display: none; width: 44px; height: 44px; flex-direction: column; justify-content: center; align-items: center; gap: 5px; }
.nav__toggle span { width: 22px; height: 2px; background: #fff; border-radius: 2px; transition: transform var(--dur-fast) var(--ease), opacity var(--dur-fast); }

.nav__panel { position: fixed; inset: var(--nav-h) 0 0 0; z-index: 99; background: var(--c-nav); padding: var(--s7) var(--gutter); transform: translateY(-12px); opacity: 0; pointer-events: none; visibility: hidden; transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease), visibility 0s linear var(--dur-fast); overflow-y: auto; }
.nav__panel.is-open { opacity: 1; transform: none; pointer-events: auto; visibility: visible; transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease), visibility 0s; }
.nav__panel-link { display: block; font-size: 26px; font-weight: 700; padding-block: var(--s4); color: #fff; border-bottom: 1px solid rgba(255,255,255,.1); }
/* 移动菜单手风琴 — 苹果移动式产品展开（点品类展开子项）*/
.nav__panel-group { border-bottom: 1px solid rgba(255,255,255,.1); }
.nav__panel-acc { display: flex; justify-content: space-between; align-items: center; width: 100%; padding-block: var(--s4); font-family: inherit; font-size: 26px; font-weight: 700; color: #fff; cursor: pointer; text-align: left; }
.nav__panel-acc-caret { width: 18px; height: 18px; opacity: .65; flex-shrink: 0; transition: transform var(--dur-fast) var(--ease); }
.nav__panel-acc[aria-expanded="true"] .nav__panel-acc-caret { transform: rotate(180deg); }
.nav__panel-sub { max-height: 0; overflow: hidden; transition: max-height var(--dur) var(--ease); }
.nav__panel-sub a { display: block; padding: 11px 0 11px 2px; font-size: 18px; font-weight: 500; color: var(--c-on-dark); }
.nav__panel-sub a:last-child { padding-bottom: 20px; }
.nav__panel-stores { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s3); margin-top: var(--s7); }
.nav__panel-stores a { text-align: center; padding: var(--s4); border-radius: var(--r-sm); border: 1px solid rgba(255,255,255,.16); font-size: var(--t-label); color: var(--c-on-dark); }

/* ============================================================
   HERO（白底）
   ============================================================ */
.hero { padding-block: clamp(64px, 9vw, 120px) clamp(56px, 8vw, 100px); background: var(--c-bg); overflow: hidden; }
.hero__grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
.hero__eyebrow { margin-bottom: var(--s5); }
.hero__title { margin-bottom: var(--s6); white-space: nowrap; }
/* 中文标题防孤字换行：CJK 词整体不拆（"半导体"不会拆成"半导体"逐字）*/
h2, h3, .bento__big, .stage__title { word-break: keep-all; }
.hero__title em { font-style: normal; color: var(--c-red); }
.hero__tagline { color: var(--c-red); margin-bottom: var(--s5); }
.hero__lead { max-width: 520px; margin-bottom: var(--s7); }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--s4); }
.hero__visual { position: relative; display: grid; place-items: center; min-height: 420px; }
.hero__product { width: clamp(300px, 36vw, 460px); filter: var(--drop-product); position: relative; z-index: 1; }
.hero__glow { position: absolute; inset: 0; background: radial-gradient(58% 58% at 60% 42%, rgba(220,33,29,.10), transparent 70%); z-index: 0; }
.hero__meta { display: flex; gap: var(--s7); margin-top: var(--s7); padding-top: var(--s6); border-top: 1px solid var(--c-line-soft); }
.hero__meta-item .num { font-size: clamp(28px, 3.4vw, 40px); font-weight: 800; letter-spacing: -.02em; display: block; line-height: 1; }
.hero__meta-item span { font-size: var(--t-caption); color: var(--c-subtle); display: block; margin-top: 8px; }

/* ============================================================
   两条产品线 / 系列入口（白/浅灰卡，非产品叙事的圆角白卡）
   ============================================================ */
.lines { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(20px, 2.4vw, 32px); }
.lines--3 { grid-template-columns: repeat(3, 1fr); }
.line-card { position: relative; border-radius: var(--r-lg); overflow: hidden; background: var(--c-soft); border: 1px solid var(--c-line-soft); padding: clamp(32px, 4vw, 56px); min-height: 440px; display: flex; flex-direction: column; transition: transform var(--dur) var(--ease-out), box-shadow var(--dur) var(--ease-out); }
.line-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-float); }
.line-card__tag { display: inline-flex; align-self: flex-start; font-size: var(--t-caption); font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--c-muted); padding: 6px 14px; border: 1px solid var(--c-line); border-radius: var(--r-pill); margin-bottom: var(--s5); }
.line-card__title { margin-bottom: var(--s4); }
.line-card__desc { color: var(--c-muted); max-width: 38ch; margin-bottom: var(--s5); }
.line-card__models { display: flex; gap: var(--s3); flex-wrap: wrap; margin-bottom: var(--s5); }
.line-card__model { font-size: var(--t-label); font-weight: 600; color: var(--c-ink); padding: 8px 16px; background: #fff; border: 1px solid var(--c-line-soft); border-radius: var(--r-pill); }
.line-card__cta { margin-top: auto; }
.line-card__visual { position: absolute; right: -6%; bottom: -4%; width: clamp(220px, 26vw, 320px); filter: var(--drop-product); opacity: .96; pointer-events: none; }

/* ============================================================
   BENTO GRID（品牌价值 / 规格对比 / 系列汇总）— 全白/浅灰，红仅作数字/图标 accent
   ============================================================ */
.bento { display: grid; grid-template-columns: repeat(6, 1fr); gap: clamp(14px, 1.6vw, 20px); }
.bento__cell { background: var(--c-bg); border: 1px solid var(--c-line-soft); border-radius: var(--r); padding: clamp(24px, 2.6vw, 36px); display: flex; flex-direction: column; transition: transform var(--dur) var(--ease-out), box-shadow var(--dur) var(--ease-out), border-color var(--dur) var(--ease-out); }
.section--alt .bento__cell { background: #fff; }
.bento__cell:hover { transform: translateY(-4px); box-shadow: var(--shadow-card); border-color: transparent; }
.bento__cell--span3 { grid-column: span 3; }
.bento__cell--span2 { grid-column: span 2; }
.bento__cell--span4 { grid-column: span 4; }
.bento__cell--span6 { grid-column: span 6; }
.bento__cell--tall { min-height: 320px; }
.bento__cell--feature { background: var(--c-tint); }  /* 极浅暖灰，强调位，仍属灰白系 */
.bento__icon { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; background: var(--c-alt); color: var(--c-red); margin-bottom: var(--s5); }
.bento__big { font-size: clamp(40px, 5vw, 68px); font-weight: 800; letter-spacing: -.03em; line-height: 1; color: var(--c-ink); }
.bento__big em { font-style: normal; color: var(--c-red); }
.bento__title { font-size: var(--t-h3); font-weight: 700; letter-spacing: -.01em; margin-bottom: var(--s3); }
.bento__text { color: var(--c-muted); font-size: var(--t-ui); }

/* ============================================================
   全屏色块叙事（产品技术亮点）— 浅色系，靠 白↔浅灰 交替制造节奏（零黑底）
   ============================================================ */
.stage { position: relative; min-height: 88vh; display: grid; align-items: center; padding-block: clamp(80px, 10vw, 140px); overflow: hidden; background: var(--c-bg); color: var(--c-ink); }
.stage--alt { background: var(--c-alt); }
.stage--soft { background: var(--c-soft); }
.stage--tint { background: linear-gradient(180deg, #ffffff 0%, var(--c-tint) 100%); }   /* 极浅暖调，氛围 */
.stage__grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 5vw, 80px); align-items: center; width: 100%; }
.stage__grid--reverse .stage__copy { order: 2; }
.stage__index { font-size: var(--t-caption); font-weight: 700; letter-spacing: .2em; color: var(--c-red); margin-bottom: var(--s5); }
.stage__title { font-size: var(--t-h1); font-weight: 800; letter-spacing: -.02em; line-height: 1.08; margin-bottom: var(--s5); color: var(--c-ink); }
.stage__sub { font-size: var(--t-h3); font-weight: 600; color: var(--c-ink); margin-bottom: var(--s5); }
.stage__text { font-size: var(--t-lead); line-height: 1.7; color: var(--c-muted); max-width: 46ch; }
.stage__visual { display: grid; place-items: center; position: relative; }
.stage__product { width: clamp(280px, 38vw, 520px); filter: var(--drop-product); position: relative; z-index: 1; }
.stage__glow { position: absolute; width: 66%; aspect-ratio: 1; border-radius: 50%; background: radial-gradient(circle, rgba(220,33,29,.12), transparent 68%); z-index: 0; filter: blur(16px); }
.stage__big-num { font-size: clamp(72px, 13vw, 168px); font-weight: 800; letter-spacing: -.04em; line-height: .9; color: var(--c-ink); }
.stage__big-num small { font-size: .26em; font-weight: 700; letter-spacing: 0; vertical-align: super; color: var(--c-red); }

/* ============================================================
   规格表
   ============================================================ */
.spec { display: grid; grid-template-columns: 1fr 1fr; gap: 0 clamp(40px, 6vw, 96px); }
.spec__row { display: flex; justify-content: space-between; gap: var(--s4); padding-block: var(--s5); border-bottom: 1px solid var(--c-line-soft); }
.spec__key { color: var(--c-muted); font-size: var(--t-ui); }
.spec__val { font-weight: 700; text-align: right; }
.spec__val--tbd { color: var(--c-subtle); font-weight: 500; font-style: italic; }
.spec__row:has(.spec__val--tbd) { display: none; }   /* 决策：发布前隐藏未定规格行 */
.tag-soon { display: inline-flex; align-items: center; gap: 8px; font-size: var(--t-label); font-weight: 700; color: var(--c-red); padding: 8px 16px; background: var(--c-red-soft); border-radius: var(--r-pill); }
.tag-soon::before { content:""; width: 8px; height: 8px; border-radius: 50%; background: var(--c-red); }

/* ============================================================
   App 区 / 装备指挥台（浅灰底，非黑！）
   ============================================================ */
.app-cta { background: var(--c-alt); color: var(--c-ink); }
.app-cta__grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
.app-cta__list { display: grid; gap: var(--s5); margin-block: var(--s7); }
.app-cta__item { display: flex; gap: var(--s4); align-items: flex-start; }
.app-cta__item b { color: var(--c-ink); font-weight: 700; display: block; }
.app-cta__item span { color: var(--c-muted); }
.app-cta__dot { width: 10px; height: 10px; border-radius: 50%; background: var(--c-red); margin-top: 8px; flex-shrink: 0; }
.app-cta__visual { display: grid; place-items: center; }

/* ============================================================
   FOOTER（黑底）— 唯一允许的黑底区之一
   ============================================================ */
.footer { background: var(--c-nav); color: var(--c-on-dark); padding-block: clamp(56px, 7vw, 88px) var(--s7); }
.footer__top { display: grid; grid-template-columns: 1.3fr 1fr 1fr 1fr; gap: clamp(28px, 4vw, 56px); padding-bottom: var(--s8); border-bottom: 1px solid rgba(255,255,255,.1); }
.footer__brand .brand { margin-bottom: var(--s5); }
.footer__brand .brand__mark { height: 72px; }    /* footer LOGO mark:wordmark = 2:1 */
.footer__brand .brand__word { height: 36px; }
.footer__slogan { color: var(--c-on-dark-mute); font-size: var(--t-ui); max-width: 30ch; }
.footer__col h4 { font-size: var(--t-caption); letter-spacing: .12em; text-transform: uppercase; color: var(--c-on-dark-faint); margin-bottom: var(--s5); font-weight: 700; }
.footer__col a { display: block; padding-block: 8px; color: var(--c-on-dark-mute); font-size: var(--t-ui); transition: color var(--dur-fast); }
.footer__col a:hover { color: #fff; }
.footer__bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--s4); padding-top: var(--s6); font-size: var(--t-caption); color: var(--c-on-dark-faint); }
.footer__bottom a { color: var(--c-on-dark-faint); }
.footer__bottom a:hover { color: var(--c-on-dark-mute); }

/* ---------- 滚动揭示 ---------- */
.reveal { opacity: 1; }   /* 无 JS 兜底：默认可见（渐进增强） */
.js-enabled .reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s var(--ease-out), transform .7s var(--ease-out); }
.js-enabled .reveal.is-visible { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: .08s; }
.reveal[data-delay="2"] { transition-delay: .16s; }
.reveal[data-delay="3"] { transition-delay: .24s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn:hover, .line-card:hover, .bento__cell:hover { transform: none; }
}

/* ============================================================
   响应式：Tablet ≤1023 / Mobile ≤767
   ============================================================ */
@media (max-width: 1023px) {
  .nav__links { display: none; }
  .nav__toggle { display: flex; }
  .nav.is-open .nav__toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav.is-open .nav__toggle span:nth-child(2) { opacity: 0; }
  .nav.is-open .nav__toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .hero__grid { grid-template-columns: 1fr; gap: var(--s7); }
  .hero__visual { order: -1; min-height: 300px; }
  .hero__product { width: clamp(260px, 52vw, 360px); }
  .stage { min-height: auto; }
  .stage__grid { grid-template-columns: 1fr; gap: var(--s6); }
  .stage__grid--reverse .stage__copy { order: 0; }
  .stage__visual { order: -1; }
  .app-cta__grid { grid-template-columns: 1fr; }
  .app-cta__visual { order: -1; }
  .bento__cell--span3, .bento__cell--span2, .bento__cell--span4 { grid-column: span 3; }
  .footer__top { grid-template-columns: 1fr 1fr; gap: var(--s7); }
  .footer__brand { grid-column: 1 / -1; }
}
@media (max-width: 767px) {
  .footer__top { grid-template-columns: 1fr; }
  :root { --gutter: 20px; }
  .lines, .lines--3 { grid-template-columns: 1fr; }
  .line-card { min-height: 360px; }
  .line-card__visual { width: 190px; opacity: .9; }
  .bento { grid-template-columns: 1fr 1fr; }
  .bento__cell--span3, .bento__cell--span2, .bento__cell--span4, .bento__cell--span6 { grid-column: span 2; }
  .bento__cell--tall { min-height: 220px; }
  .spec { grid-template-columns: 1fr; }
  .hero__meta { flex-wrap: wrap; gap: var(--s5); }
  .stage__product { width: clamp(220px, 64vw, 320px); }
}
@media (max-width: 420px) {
  .bento { grid-template-columns: 1fr; }
  .bento__cell--span3, .bento__cell--span2, .bento__cell--span4, .bento__cell--span6 { grid-column: span 1; }
  .nav__panel-stores { grid-template-columns: 1fr; }
}

/* ============================================================
   ===== V2 交叉优化新增（吸收 Codex 亮点，全部灰白实现）=====
   ============================================================ */
/* App 控制界面 mockup（灰白手机，体现 App 全掌控） */
.app-mock { width: clamp(248px, 28vw, 320px); background: #fff; border-radius: 40px; padding: 12px; box-shadow: var(--shadow-float); border: 1px solid var(--c-line-soft); position: relative; z-index: 1; }
.app-mock__screen { background: var(--c-alt); border-radius: 30px; padding: var(--s6) var(--s5); }
.app-mock__bar { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--s4); }
.app-mock__dev { font-weight: 700; font-size: var(--t-ui); }
.app-mock__live { font-size: var(--t-micro); color: var(--c-muted); display: inline-flex; align-items: center; gap: 6px; }
.app-mock__live::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: #34c759; }
.app-mock__temp { font-size: 60px; font-weight: 800; letter-spacing: -.03em; line-height: 1; }
.app-mock__temp small { font-size: .36em; color: var(--c-muted); font-weight: 700; }
.app-mock__stats { display: flex; gap: var(--s3); margin: var(--s5) 0; }
.app-mock__stat { flex: 1; background: #fff; border-radius: 14px; padding: 12px 14px; }
.app-mock__stat b { display: block; font-size: 17px; font-weight: 800; }
.app-mock__stat span { font-size: 11px; color: var(--c-subtle); }
.app-mock__label { font-size: var(--t-micro); color: var(--c-subtle); margin-bottom: 10px; letter-spacing: .04em; }
.app-mock__leds { display: flex; gap: 9px; margin-bottom: var(--s5); }
.app-mock__led { width: 22px; height: 22px; border-radius: 50%; box-shadow: 0 2px 8px rgba(0,0,0,.12); }
.app-mock__modes { display: flex; gap: 6px; background: #fff; padding: 5px; border-radius: 14px; }
.app-mock__mode { flex: 1; text-align: center; font-size: var(--t-micro); font-weight: 600; padding: 9px 0; border-radius: 10px; color: var(--c-muted); }
.app-mock__mode--on { background: var(--c-red); color: #fff; }

/* 全屏色块叙事：极淡网格质感（精密机械感，--c-line-soft 极浅灰 + 中心淡出，不破坏灰白） */
.stage::before { content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background-image: linear-gradient(var(--c-line-soft) 1px, transparent 1px), linear-gradient(90deg, var(--c-line-soft) 1px, transparent 1px);
  background-size: 56px 56px; opacity: .55;
  -webkit-mask-image: radial-gradient(ellipse 72% 62% at 50% 45%, #000, transparent 80%);
  mask-image: radial-gradient(ellipse 72% 62% at 50% 45%, #000, transparent 80%); }
.stage > .wrap { position: relative; z-index: 1; }

/* ===== 修复：line-card 产品图不再绝对定位遮挡文字（改文档流底部居中）===== */
.line-card { padding-bottom: clamp(28px, 3.5vw, 44px); }
.line-card__cta { margin-top: var(--s5); }
.line-card__visual { position: static; right: auto; bottom: auto; opacity: 1; pointer-events: auto; width: min(68%, 210px); height: auto; margin: var(--s7) auto 0; align-self: center; }

/* ===== 语言切换（nav 黑底描边 pill + 浅色下拉浮层，符合黑白精密风）===== */
.lang-switch { position: relative; }
.lang-switch__btn { display: inline-flex; align-items: center; gap: 7px; height: 38px; padding: 0 13px; border-radius: var(--r-pill); border: 1px solid rgba(255,255,255,.22); color: var(--c-on-dark); font-size: var(--t-label); font-weight: 600; transition: border-color var(--dur-fast), color var(--dur-fast), background var(--dur-fast); }
.lang-switch__btn:hover { border-color: rgba(255,255,255,.55); color: #fff; }
.lang-switch.is-open .lang-switch__btn { border-color: #fff; color: #fff; background: rgba(255,255,255,.06); }
.lang-switch__globe { width: 16px; height: 16px; opacity: .9; }
.lang-switch__caret { width: 11px; height: 11px; opacity: .8; transition: transform var(--dur-fast) var(--ease); }
.lang-switch.is-open .lang-switch__caret { transform: rotate(180deg); }
.lang-switch__menu { position: absolute; top: calc(100% + 12px); right: 0; min-width: 178px; background: #fff; border: 1px solid var(--c-line-soft); border-radius: var(--r); box-shadow: var(--shadow-float); padding: 7px; opacity: 0; transform: translateY(-8px) scale(.98); transform-origin: top right; pointer-events: none; visibility: hidden; transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease), visibility 0s linear var(--dur-fast); z-index: 110; }
.lang-switch.is-open .lang-switch__menu { opacity: 1; transform: none; pointer-events: auto; visibility: visible; transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease), visibility 0s; }
.lang-switch__item { display: flex; align-items: center; justify-content: space-between; gap: var(--s4); padding: 11px 13px; border-radius: 13px; font-size: var(--t-label); font-weight: 500; color: var(--c-ink); cursor: pointer; transition: background var(--dur-fast); }
.lang-switch__item:hover { background: var(--c-alt); }
.lang-switch__item--active { color: var(--c-red); font-weight: 700; }
.lang-switch__check { width: 16px; height: 16px; flex-shrink: 0; opacity: 0; color: var(--c-red); }
.lang-switch__item--active .lang-switch__check { opacity: 1; }
@media (max-width: 1023px) { .nav__cta .lang-switch { display: none; } }

/* 移动端语言切换（进 nav__panel，分段 pill） */
.nav__panel-lang { display: none; margin-top: var(--s6); gap: var(--s2); }
.nav__panel-lang button { flex: 1; height: 46px; border-radius: var(--r-pill); border: 1px solid rgba(255,255,255,.2); color: var(--c-on-dark); font-size: var(--t-label); font-weight: 600; }
.nav__panel-lang button.is-active { background: var(--c-red); border-color: var(--c-red); color: #fff; }
@media (max-width: 1023px) { .nav__panel-lang { display: flex; } }

/* ===== 下载 store badge（App Store / Android 传统机器人）===== */
.store-row { display: flex; flex-wrap: wrap; gap: var(--s4); }
/* 产品页/CTA 三旗舰店入口（描边 pill + hover 店铺识别色，协调 design-v2 极简）*/
.shop-cta { display: inline-flex; flex-wrap: wrap; gap: var(--s3); }
.shop-link { display: inline-flex; align-items: center; gap: 9px; padding: 7px 16px 7px 7px; border-radius: var(--r-pill); background: var(--c-alt); color: var(--c-ink); font-size: var(--t-ui); font-weight: 600; border: 1px solid var(--c-line-soft); transition: background var(--dur-fast) var(--ease), border-color var(--dur-fast), box-shadow var(--dur-fast), transform var(--dur-fast); }
.shop-link:hover { background: #fff; border-color: var(--c-line); transform: translateY(-2px); box-shadow: var(--shadow-card); }
.shop-link .shop-logo { width: 28px; height: 28px; border-radius: 7px; flex-shrink: 0; object-fit: cover; }
.store-badge { display: inline-flex; align-items: center; gap: 11px; height: 58px; padding: 0 22px; border-radius: 15px; background: var(--c-ink); color: #fff; transition: transform var(--dur-fast) var(--ease), background var(--dur-fast); }
.store-badge:hover { background: #000; transform: translateY(-2px); }
.store-badge__icon { width: 26px; height: 26px; flex-shrink: 0; }
.store-badge__txt { display: flex; flex-direction: column; line-height: 1.12; text-align: left; }
.store-badge__txt small { font-size: 11px; opacity: .82; font-weight: 500; }
.store-badge__txt b { font-size: var(--t-body); font-weight: 700; }

/* 品牌收尾区（完整 LOGO logo-brand）*/
.brand-close { background: var(--c-soft); text-align: center; }
.brand-close__logo { width: clamp(200px, 26vw, 300px); margin: 0 auto var(--s6); }
.brand-close__slogan { font-size: var(--t-h3); font-weight: 600; color: var(--c-ink); margin-bottom: var(--s7); }

/* ===== App 下载页（download.html）===== */
.dl-hero { background: var(--c-bg); }
.dl-hero__inner { max-width: 720px; margin-inline: auto; display: flex; flex-direction: column; align-items: center; text-align: center; }
.dl-hero__logo { width: clamp(200px, 26vw, 260px); height: auto; margin-bottom: var(--s6); }
.dl-hero__eyebrow { margin-bottom: var(--s4); }
.dl-hero__title { margin-bottom: var(--s5); }
.dl-hero__desc { max-width: 520px; margin-bottom: var(--s8); }

/* 下载按钮组（黑底白字传统 store 按钮，对齐 .store-badge 风格）*/
.dl-store-row { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--s4); margin-bottom: var(--s7); }
.dl-store-btn {
  display: inline-flex; align-items: center; gap: 12px;
  min-width: 200px; min-height: 60px; padding: 0 24px;
  border-radius: var(--r-sm);
  background: var(--c-ink); color: #fff;
  transition: background var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}
.dl-store-btn:hover { background: #000; transform: translateY(-2px); box-shadow: var(--shadow-card); }
.dl-store-btn:active { transform: translateY(0); }
.dl-store-btn__icon { width: 30px; height: 30px; flex-shrink: 0; }
.dl-store-btn__txt { display: flex; flex-direction: column; line-height: 1.18; text-align: left; }
.dl-store-btn__txt small { font-size: 11px; opacity: .82; font-weight: 500; min-height: 13px; }
.dl-store-btn__txt b { font-size: var(--t-body); font-weight: 700; }
/* 鸿蒙占位禁用：降透明 + 禁交互 */
.dl-store-btn--disabled { background: var(--c-muted); opacity: .55; cursor: not-allowed; pointer-events: none; }
.dl-store-btn--disabled:hover { background: var(--c-muted); transform: none; box-shadow: none; }

/* 二维码卡片（白底描边，对齐精密黑白风）*/
.dl-qr-card {
  display: inline-flex; flex-direction: column; align-items: center; gap: var(--s3);
  padding: var(--s5); margin-bottom: var(--s6);
  border-radius: var(--r); background: #fff;
  border: 1px solid var(--c-line-soft); box-shadow: var(--shadow-card);
}
.dl-qr-card__img { width: 132px; height: 132px; display: grid; place-items: center; }
.dl-qr-card__img img { width: 100%; height: 100%; display: block; image-rendering: pixelated; }
.dl-qr-card__tip { font-size: var(--t-label); font-weight: 600; color: var(--c-muted); }

.dl-hero__hint { font-size: var(--t-caption); color: var(--c-subtle); max-width: 480px; line-height: 1.6; }

@media (max-width: 560px) {
  .dl-store-row { flex-direction: column; align-items: stretch; width: 100%; }
  .dl-store-btn { width: 100%; justify-content: center; }
}

/* ============ 实拍图集（产品页） ============ */
.gallery__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(12px, 1.6vw, 20px); }
.gallery__grid img { width: 100%; aspect-ratio: 3 / 2; object-fit: cover; border-radius: var(--r); display: block; }
@media (max-width: 720px) { .gallery__grid { grid-template-columns: 1fr 1fr; } }

/* 吸风结构示意视频（竖版 9:16，限高居中） */
.stage__video { max-height: min(84vh, 760px); width: auto; margin-inline: auto; border-radius: var(--r); }

/* stage 区实拍图（带背景，圆角收边） */
.stage__photo { border-radius: var(--r); width: clamp(320px, 46vw, 680px); }

/* ============ 图集 lightbox ============ */
.lightbox { position: fixed; inset: 0; z-index: 200; background: rgba(0,0,0,.92); display: grid; place-items: center; padding: 4vmin; }
.lightbox[hidden] { display: none; }
.lightbox__img { max-width: 92vw; max-height: 90vh; border-radius: var(--r); object-fit: contain; }
.lightbox__close { position: absolute; top: 16px; right: 20px; width: 44px; height: 44px; border: 0; border-radius: 50%; background: rgba(255,255,255,.12); color: #fff; font-size: 26px; line-height: 1; cursor: pointer; }
.lightbox__close:hover { background: rgba(255,255,255,.24); }

/* ============ 制裁页 vivo 式图文比例（图主导 / 文案极简层级） ============ */
.page-zhicai .stage__grid { grid-template-columns: 0.52fr 1.48fr; gap: clamp(24px, 3.5vw, 56px); }
.page-zhicai .stage__grid--reverse { grid-template-columns: 1.48fr 0.52fr; }
.page-zhicai .stage__grid--reverse .stage__copy { order: 2; }
.page-zhicai .stage__grid--reverse .stage__visual { order: 1; }
.page-zhicai .stage__photo { width: 100%; max-width: none; }
.page-zhicai .stage__product:not(.stage__photo):not(.stage__video) { width: clamp(360px, 42vw, 620px); }
.page-zhicai .stage__video { max-height: min(88vh, 820px); }
.page-zhicai .stage__title { font-size: clamp(38px, 4.2vw, 60px); line-height: 1.08; }
.page-zhicai .stage__sub { font-size: clamp(17px, 1.6vw, 22px); font-weight: 700; }
.page-zhicai .stage__text { max-width: 34ch; color: var(--c-muted); }
@media (max-width: 960px) {
  .page-zhicai .stage__grid, .page-zhicai .stage__grid--reverse { grid-template-columns: 1fr; }
  .page-zhicai .stage__grid--reverse .stage__copy { order: 0; }
  .page-zhicai .stage__grid--reverse .stage__visual { order: -1; }
}