/* AumSeat —— 虚构的办公椅 OEM 厂。整站样式一份，没有构建步骤。
   配色和头部跟同系列其余原型一致。 */
:root {
  --blue: #003e7e;
  --orange: #ed6500;
  --ink: #1a1a1a;
  --muted: #777;
  --line: #e1e1e1;
  --paper: #faf8f6;

  /* 🔴 产品图的颜色全部走这三个变量 —— JS 只改变量，
     SVG 里每一块都在 transition，所以换材质是**渐变过去**的，不是跳变。
     这是这个演示里最要紧的一处观感：跳变看着像换了张图片，
     渐变才像同一把椅子换了套面料。 */
  --frame: #3a3a3c;
  --uph: #4a4a4d;
  --base: #2c2a28;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: #fff; color: var(--ink); font: 14px/1.45 Manrope, Arial, sans-serif; }
h1, h2, h3 { margin: 0; }

/* ── 站点头 ───────────────────────────────────────────── */
.site-header {
  height: 76px; display: flex; align-items: center; gap: 54px;
  padding: 0 max(34px, calc((100vw - 1360px) / 2 + 34px));
  border-bottom: 1px solid #e5e5e5; background: #fff;
}
.wordmark { display: flex; align-items: center; gap: 9px; color: #111; text-decoration: none; letter-spacing: 1.1px; font-size: 12px; }
.wordmark-mark { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: var(--orange); color: #fff; font: italic 15px Georgia, serif; }
.wordmark strong span { font-weight: 500; color: #777; }
.main-nav { display: flex; align-self: stretch; align-items: center; gap: 29px; flex: 1; }
.main-nav a { height: 100%; display: flex; align-items: center; position: relative; color: #676467; text-decoration: none; font-size: 11px; }
.main-nav a.active { color: #151515; font-weight: 700; }
.main-nav a.active:after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 2px; background: var(--orange); }
.header-actions { display: flex; align-items: center; gap: 15px; }
.header-actions > button[aria-label='Search'] { display: grid; place-items: center; width: 25px; height: 25px; padding: 0; border: 0; background: none; color: #252525; }
.header-actions > button[aria-label='Search'] svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.7; }
.contact-button { padding: 10px 13px; border: 0; border-radius: 4px; background: #171717; color: #fff; font-size: 10px; font-weight: 700; cursor: pointer; }

/* ── 产品页 ───────────────────────────────────────────── */
.product-shell { max-width: 1360px; margin: 0 auto; padding: 34px 34px 96px; }
.crumb-row { display: flex; justify-content: space-between; align-items: center; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.breadcrumbs { display: flex; gap: 8px; align-items: center; font-size: 13px; }
.breadcrumbs a { color: var(--blue); text-decoration: none; }
.breadcrumbs span { color: #999; }
.crumb-row > p { margin: 0; color: #888; font-size: 10px; }
.product-hero { display: grid; grid-template-columns: 1fr 1fr; gap: 54px; padding: 36px 0 50px; }

.visual-frame { display: grid; place-items: center; height: 420px; overflow: hidden; border-radius: 14px; background: linear-gradient(165deg, #f6f4f1, #eae7e2); }
/* ⚠️ 这层投影不是装饰。白色和钛色框架跟这块浅底几乎同色，
   不给轮廓的话扶手连杆整个消失，椅子看起来是断的。 */
.chair { width: auto; height: 88%; max-width: 100%; filter: drop-shadow(0 1px 1.2px rgba(0, 0, 0, .13)); }

/* 产品图各部件 —— 颜色来自 :root 的三个变量 */
.chair .frame { fill: var(--frame); transition: fill .55s ease; }
.chair .frame-stroke { fill: none; stroke: var(--frame); stroke-width: 9; stroke-linecap: round; transition: stroke .55s ease; }
.chair .uph { fill: var(--uph); transition: fill .55s ease; }
.chair .base { fill: var(--base); transition: fill .55s ease; }
.chair .legs path { fill: none; stroke: var(--base); stroke-width: 9; stroke-linecap: round; transition: stroke .55s ease; }
/* 抛光铝：填充换成渐变，光泽本身就是它跟尼龙的区别 */
body.base-alu .chair .base { fill: url(#alu); }
body.base-alu .chair .legs path { stroke: url(#alu); }

/* 头枕：出现和消失都要有过程 —— 瞬间冒出来像是页面坏了 */
.headrest { transform-origin: 120px 60px; transition: opacity .45s ease, transform .45s cubic-bezier(.34, 1.4, .64, 1); }
.headrest.off { opacity: 0; transform: translateY(14px) scale(.94); pointer-events: none; }
/* 4D 扶手：更宽的扶手垫 + 略高 */
.arm { transition: transform .45s cubic-bezier(.34, 1.3, .64, 1); }
body.arm-4d .arm-left { transform: translate(-5px, -4px); }
body.arm-4d .arm-right { transform: translate(5px, -4px); }
body.arm-4d .chair .arm rect { transition: width .45s ease, x .45s ease; }

.gallery { display: flex; align-items: center; gap: 9px; margin-top: 14px; }
.shot { width: 54px; height: 46px; padding: 0; border: 1px solid var(--line); border-radius: 7px; background: linear-gradient(160deg, #f5f2ef, #e6e2dd); cursor: pointer; }
.shot.active { border-color: #b3aca5; }
.gallery-note { margin-left: 6px; font-size: 10px; color: #9b9590; transition: color .4s; }
.gallery-note.off-catalogue { color: var(--orange); font-weight: 700; }

.eyebrow { font: 600 10px/1 monospace; letter-spacing: 1.1px; color: var(--muted); text-transform: uppercase; }
.product-info h1 { margin: 12px 0 0; font-size: 44px; letter-spacing: -1.1px; }
.subtitle { margin: 8px 0 0; color: #5f5b58; font-size: 14px; }

.spec-block { margin-top: 24px; }
.spec-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 20px; margin: 0; padding: 18px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.spec-list dt { font: 500 9px/1 monospace; letter-spacing: .4px; color: var(--muted); text-transform: uppercase; }
.spec-list dd { margin: 6px 0 0; font-size: 14px; font-weight: 700; }
.spec-list dd.changed { animation: flash .7s ease; }
@keyframes flash { 0% { color: var(--orange); } 100% { color: inherit; } }

.code-row { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-top: 18px; padding: 14px 16px; border-radius: 9px; background: var(--paper); }
.code-label { display: block; font: 500 9px/1 monospace; letter-spacing: .5px; color: var(--muted); text-transform: uppercase; }
.code-row b { display: block; margin-top: 7px; font: 700 16px/1 DM Mono, monospace; letter-spacing: .5px; }
.btn-copy { padding: 9px 14px; border: 1px solid #cfc9c3; border-radius: 5px; background: #fff; font-size: 11px; font-weight: 700; cursor: pointer; transition: border-color .3s, color .3s; }
.btn-copy.done { border-color: #9ccbaa; color: #256b3c; }

.price-row { display: flex; gap: 34px; margin-top: 18px; }
.price-row span { display: block; font: 500 9px/1 monospace; letter-spacing: .4px; color: var(--muted); text-transform: uppercase; }
.price-row b { display: block; margin-top: 7px; font-size: 17px; }
.price-row b i { font-style: normal; font-size: 26px; color: var(--orange); letter-spacing: -.5px; }

.actions { display: flex; gap: 12px; margin-top: 26px; }
.btn-primary { padding: 14px 22px; border: 0; border-radius: 5px; background: var(--orange); color: #fff; font-size: 12px; font-weight: 700; letter-spacing: .3px; cursor: pointer; }
.btn-ghost { padding: 14px 22px; border: 1px solid #cfc9c3; border-radius: 5px; background: none; font-size: 12px; font-weight: 700; cursor: pointer; }

/* ── 浮动入口 + 配置面板 ──────────────────────────────── */
.config-trigger {
  position: fixed; z-index: 6; right: 26px; bottom: 26px;
  display: flex; align-items: center; gap: 9px;
  padding: 14px 20px; border: 0; border-radius: 30px;
  background: #171717; color: #fff; font-size: 12px; font-weight: 700; cursor: pointer;
  box-shadow: 0 12px 30px #0000002e;
}
.config-trigger svg { width: 17px; height: 17px; fill: none; stroke: #ff984d; stroke-width: 1.8; stroke-linecap: round; }

.config-panel {
  position: fixed; z-index: 7; right: 26px; bottom: 26px;
  display: flex; flex-direction: column;
  width: 460px; max-height: calc(100dvh - 52px);
  border-radius: 14px; background: #fff; box-shadow: 0 26px 70px #00000029;
  opacity: 0; visibility: hidden; transform: translateY(14px);
  transition: opacity .28s, transform .28s, visibility .28s;
}
.config-panel.open { opacity: 1; visibility: visible; transform: none; }
.config-panel header { display: flex; justify-content: space-between; gap: 14px; padding: 18px 22px 15px; border-bottom: 1px solid #f0ece8; }
.config-panel header span { font: 600 9px/1 monospace; letter-spacing: 1px; color: var(--orange); text-transform: uppercase; }
.config-panel header h2 { margin-top: 8px; font-size: 17px; letter-spacing: -.3px; }
.config-panel header > button { align-self: start; width: 26px; height: 26px; padding: 0; border: 0; background: none; color: #8b8580; cursor: pointer; }
.config-panel header > button svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.7; }
.config-content { flex: 1; min-height: 0; overflow-y: auto; padding: 16px 22px 22px; }
.config-intro { margin: 0 0 16px; color: #5f5b58; font-size: 12px; line-height: 1.65; }

.opt-group { margin-bottom: 15px; }
.opt-label { display: block; margin-bottom: 8px; font: 600 9px/1 monospace; letter-spacing: .8px; color: var(--muted); text-transform: uppercase; }
.swatch-row { display: flex; flex-wrap: wrap; gap: 8px; }
.swatch { display: flex; align-items: center; gap: 8px; padding: 6px 12px 6px 6px; border: 1px solid var(--line); border-radius: 22px; background: #fff; font-size: 11px; font-weight: 600; color: #45413e; cursor: pointer; transition: border-color .2s, background .2s; }
.swatch i { width: 20px; height: 20px; border-radius: 50%; background: var(--sw); box-shadow: inset 0 0 0 1px #0000001a; flex: none; }
.swatch:hover { border-color: #b9b2ab; }
.swatch.on { border-color: var(--orange); background: #fff4ea; color: #a55a10; }
.chip-row { display: flex; flex-wrap: wrap; gap: 7px; }
.chip { padding: 8px 12px; border: 1px solid var(--line); border-radius: 20px; background: #fff; font-size: 11px; font-weight: 600; color: #45413e; cursor: pointer; transition: border-color .2s, background .2s, color .2s; }
.chip em { font-style: normal; color: var(--muted); }
.chip:hover { border-color: #b9b2ab; }
.chip.on { border-color: var(--orange); background: #fff4ea; color: #a55a10; }
.chip.on em { color: #c07a34; }

.build-summary { margin-top: 18px; padding: 15px 16px; border: 1px solid #d8d2cb; border-radius: 10px; }
.build-label { font: 600 9px/1 monospace; letter-spacing: .8px; color: var(--muted); text-transform: uppercase; }
.build-summary b { display: block; margin-top: 8px; font: 700 17px/1 DM Mono, monospace; letter-spacing: .5px; }
.build-summary p { margin: 8px 0 0; font-size: 11px; color: #5f5b58; line-height: 1.6; }
.build-shot { color: var(--orange) !important; font-weight: 700; }
#toEnquiry { width: 100%; margin-top: 14px; }

/* ── Toast ───────────────────────────────────────────── */
.toast {
  position: fixed; z-index: 20; left: 50%; bottom: 34px;
  padding: 12px 20px; border-radius: 8px; background: #1c1a18; color: #fff;
  font-size: 12px; white-space: nowrap;
  opacity: 0; transform: translate(-50%, 10px); pointer-events: none;
  transition: opacity .3s, transform .3s;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ── 窄屏 ────────────────────────────────────────────── */
@media (max-width: 980px) {
  .site-header { gap: 20px; padding: 0 18px; }
  .main-nav { display: none; }
  .product-shell { padding: 22px 18px 80px; }
  .product-hero { grid-template-columns: 1fr; gap: 28px; padding: 24px 0 36px; }
  .visual-frame { height: 280px; }
  .product-info h1 { font-size: 32px; }
  .price-row { gap: 22px; }
  .config-panel { right: 12px; left: 12px; bottom: 12px; width: auto; max-height: calc(100dvh - 24px); }
  .config-trigger { right: 12px; bottom: 12px; }
}