/* 欣源企業官網 — 共用樣式表。配色與字體延續已核准的視覺設計稿。 */

:root {
  --bg: #F1F2EF;
  --bg-white: #FFFFFF;
  --nav-bg: #17140F;
  --nav-border: #43392C;
  --nav-border-soft: #3A3225;
  --nav-border-softer: #2E271C;
  --on-dark: #F3F1EA;
  --on-dark-soft: #C2B9A6;
  --on-dark-muted: #8A8272;
  --on-dark-mutedest: #5C5546;
  --accent: #C2591E;
  --accent-hover: #9C4517;
  --accent-tint-bg: #F1DDCC;
  --accent-tint-text: #9C4517;
  --ink: #1C1913;
  --ink-soft: #5F5A4E;
  --ink-mute: #8A8272;
  --border: #DBDAD2;
  --border-soft: #C6C3B7;
  --blue: #2E5C8A;
  --blue-tint-bg: #DCE6EE;
  --font-body: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --font-wordmark: "Big Shoulders Display", "Noto Sans TC", sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }
img { max-width: 100%; display: block; }
.mono { font-family: var(--font-mono); }
.container { max-width: 1440px; margin: 0 auto; padding: 0 64px; }
@media (max-width: 900px) { .container { padding: 0 20px; } }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 24px; border-radius: 6px; font-size: 14.5px; font-weight: 600;
  border: 1.5px solid transparent; cursor: pointer; font-family: var(--font-body);
}
.btn--primary { background: var(--accent); color: var(--on-dark); }
.btn--primary:hover { background: var(--accent-hover); color: var(--on-dark); }
.btn--outline-dark { border-color: #4A4030; color: var(--on-dark); }
.btn--outline-dark:hover { color: var(--on-dark); border-color: var(--on-dark-soft); }
.btn--outline-light { border-color: var(--border); color: var(--ink); background: var(--bg-white); }
.btn--outline-light:hover { border-color: var(--ink-mute); color: var(--ink); }
.btn--block { width: 100%; justify-content: center; }
.btn[disabled] { opacity: .55; cursor: not-allowed; }

/* ---- Nav ---- */
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px 64px; background: var(--nav-bg); flex-wrap: wrap; gap: 16px;
  position: relative; z-index: 40;
}
@media (max-width: 900px) { .nav { padding: 18px 20px; } }
.nav__brand { display: flex; align-items: center; gap: 14px; color: var(--on-dark); font-size: 19px; font-weight: 700; letter-spacing: .04em; }
.nav__brand span { color: var(--on-dark-soft); font-weight: 400; font-size: 14px; }
.nav__links { display: flex; align-items: center; gap: 36px; flex-wrap: wrap; }
.nav__links a { color: var(--on-dark); font-size: 15px; }
.nav__links a.is-active { color: var(--accent); }
.nav__right { display: flex; align-items: center; gap: 16px; }
.nav__lang { position: relative; }
.nav__lang > summary { list-style: none; display: flex; align-items: center; gap: 6px; padding: 8px 12px; border: 1px solid var(--nav-border); border-radius: 20px; color: var(--on-dark); font-size: 14px; cursor: pointer; }
.nav__lang > summary::-webkit-details-marker { display: none; }
.nav__lang-menu { position: absolute; top: 42px; right: 0; width: 150px; max-width: calc(100vw - 40px); background: #221B14; border: 1px solid var(--nav-border); border-radius: 10px; padding: 6px; box-shadow: 0 12px 28px rgba(0,0,0,.35); }
.nav__lang-menu a { display: flex; justify-content: space-between; padding: 8px 10px; border-radius: 6px; color: var(--on-dark-soft); font-size: 13.5px; }
.nav__lang-menu a.is-active { background: #2E5C8A22; color: var(--on-dark); }
/* 手機版 .nav 會用 flex-wrap 讓 .nav__right（含語言選單）整個換到下一行、緊貼在螢幕左側；
   這時如果選單還是用 right:0（往左展開），150px 寬的選單有一大半會超出螢幕左邊界被裁掉
   （使用者回報「下拉一半字跑出界被蓋掉了」就是這個）。改成 left:0（往右展開）就會貼齊按鈕
   左邊往右長，配合上面 max-width 保底，兩種版面都不會超出螢幕。 */
@media (max-width: 900px) {
  .nav__lang-menu { left: 0; right: auto; }
}
.nav__cta { padding: 10px 20px; background: var(--accent); color: var(--on-dark); border-radius: 6px; font-size: 14.5px; font-weight: 500; }
.nav__cta:hover { color: var(--on-dark); background: var(--accent-hover); }

/* ---- Breadcrumb ---- */
.breadcrumb { font-size: 13px; color: var(--ink-mute); margin-bottom: 14px; }
.breadcrumb .sep { color: var(--border-soft); margin: 0 4px; }
.breadcrumb .current { color: var(--ink-soft); }

/* ---- Footer ---- */
.footer { background: var(--nav-bg); padding: 56px 64px 40px; }
@media (max-width: 900px) { .footer { padding: 40px 20px 28px; } }
.footer__top { display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 32px; padding-bottom: 32px; border-bottom: 1px solid var(--nav-border-softer); }
.footer__brand { color: var(--on-dark); font-size: 17px; font-weight: 700; margin-bottom: 10px; }
.footer__addr { color: var(--on-dark-muted); font-size: 13.5px; line-height: 1.9; }
.footer__cols { display: flex; gap: 64px; flex-wrap: wrap; }
.footer__col-heading { color: var(--on-dark-soft); font-size: 12.5px; letter-spacing: .08em; margin-bottom: 14px; }
.footer__col a, .footer__col span { color: var(--on-dark-muted); font-size: 13.5px; line-height: 2.2; display: block; }
.footer__bottom { padding-top: 24px; color: var(--on-dark-mutedest); font-size: 12.5px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.footer--simple { display: flex; justify-content: space-between; align-items: center; padding: 44px 64px; flex-wrap: wrap; gap: 8px; }
.footer--simple span { color: var(--on-dark-muted); font-size: 13px; }

/* ---- Hero ---- */
.hero { position: relative; background: var(--nav-bg); padding: 100px 64px 120px; overflow: hidden; }
@media (max-width: 900px) { .hero { padding: 60px 20px 70px; } }
.hero__content { max-width: 640px; position: relative; }
.hero__eyebrow { color: var(--accent); font-size: 14px; font-weight: 600; letter-spacing: .12em; margin-bottom: 22px; }
.hero__wordmark { font-family: var(--font-wordmark); font-weight: 900; letter-spacing: .02em; color: var(--accent); font-size: 30px; margin-bottom: 10px; }
.hero__title { color: var(--on-dark); font-size: 52px; font-weight: 900; line-height: 1.28; margin: 0 0 22px; letter-spacing: .01em; }
@media (max-width: 900px) { .hero__title { font-size: 34px; } }
.hero__desc { color: var(--on-dark-soft); font-size: 17px; line-height: 1.8; max-width: 520px; margin: 0 0 36px; }
.hero__actions { display: flex; gap: 16px; margin-bottom: 52px; flex-wrap: wrap; }
.hero__badges { display: flex; gap: 12px; flex-wrap: wrap; }
.hero__badge { display: flex; align-items: center; gap: 8px; padding: 9px 16px; border: 1px solid var(--nav-border-soft); border-radius: 20px; color: var(--on-dark); font-size: 13.5px; }
.hero__badge .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); display: inline-block; }
.hero__art { position: absolute; right: -40px; top: 20px; opacity: 1; }

/* ---- Section headings ---- */
.section { padding: 88px 64px; }
@media (max-width: 900px) { .section { padding: 48px 20px; } }
.section__head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 44px; flex-wrap: wrap; gap: 12px; }
.section__title { font-size: 28px; font-weight: 900; color: var(--ink); margin: 0; }

/* ---- Category grid ---- */
.category-grid { display: grid; grid-template-columns: repeat(5, minmax(0,1fr)); gap: 20px; }
@media (max-width: 1100px) { .category-grid { grid-template-columns: repeat(3, minmax(0,1fr)); } }
@media (max-width: 640px) { .category-grid { grid-template-columns: repeat(2, minmax(0,1fr)); } }
.category-card { padding: 28px 22px; background: var(--bg-white); border: 1px solid var(--border); display: block; }
.category-card svg { margin-bottom: 18px; }
.category-card__name { font-size: 16px; font-weight: 700; color: var(--ink); margin-bottom: 6px; }
.category-card__desc { font-size: 13px; color: var(--ink-soft); line-height: 1.6; }

/* ---- Designer feature block ---- */
.feature-split { display: grid; grid-template-columns: 1fr 1fr; background: var(--bg-white); border: 1px solid var(--border); }
@media (max-width: 900px) { .feature-split { grid-template-columns: 1fr; } }
.feature-split__text { padding: 64px; display: flex; flex-direction: column; justify-content: center; }
@media (max-width: 900px) { .feature-split__text { padding: 36px 24px; } }
.feature-split__eyebrow { color: var(--blue); font-size: 13px; font-weight: 600; letter-spacing: .1em; margin-bottom: 16px; }
.feature-split__title { font-size: 30px; font-weight: 900; color: var(--ink); line-height: 1.35; margin: 0 0 20px; }
.feature-split__desc { font-size: 15.5px; color: var(--ink-soft); line-height: 1.85; margin: 0 0 28px; }
.feature-split__stats { display: flex; gap: 20px; margin-bottom: 8px; }
.feature-split__stats .num { font-size: 13px; color: var(--blue); font-weight: 600; }
.feature-split__stats .label { font-size: 13px; color: var(--ink-soft); }
.feature-split__art { background: var(--bg); display: flex; align-items: center; justify-content: center; padding: 40px; border-left: 1px solid var(--border); }
@media (max-width: 900px) { .feature-split__art { border-left: none; border-top: 1px solid var(--border); } }
.feature-split__card { background: var(--bg-white); border: 1px solid var(--border); padding: 28px 36px; display: flex; align-items: center; gap: 28px; flex-wrap: wrap; }

/* ---- Scope stats ---- */
.stat-grid { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 1px; background: var(--border); border: 1px solid var(--border); }
@media (max-width: 640px) { .stat-grid { grid-template-columns: repeat(2, minmax(0,1fr)); } }
.stat-grid__cell { background: var(--bg-white); padding: 30px 26px; }
.stat-grid__num { font-size: 34px; font-weight: 600; color: var(--accent); font-family: var(--font-mono); }
.stat-grid__label { font-size: 14px; color: var(--ink-soft); margin-top: 8px; }

/* ---- Page header (breadcrumb + title) ---- */
.page-header { padding: 44px 64px 36px; border-bottom: 1px solid var(--border); }
@media (max-width: 900px) { .page-header { padding: 28px 20px 24px; } }
.page-header h1 { font-size: 32px; font-weight: 900; color: var(--ink); margin: 0 0 10px; }
.page-header p { font-size: 15px; color: var(--ink-soft); margin: 0; max-width: 720px; }

/* ---- Catalog layout ---- */
.catalog-layout { display: flex; gap: 48px; padding: 40px 64px 96px; align-items: flex-start; }
@media (max-width: 900px) { .catalog-layout { flex-direction: column; padding: 24px 20px 56px; } }
.filters { width: 240px; flex: 0 0 auto; }
@media (max-width: 900px) { .filters { width: 100%; } }
.filters__group { margin-bottom: 36px; }
.filters__heading { font-size: 13px; font-weight: 700; color: var(--ink); letter-spacing: .04em; margin-bottom: 16px; }
.filters__list { display: flex; flex-direction: column; gap: 12px; }
.filters__list label, .filters__list a { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--ink-soft); }
.filters__list a.is-active { color: var(--ink); font-weight: 600; }
.filters__list .count { color: var(--ink-mute); margin-left: auto; }
.chip-group { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { padding: 7px 14px; border: 1.5px solid var(--border); color: var(--ink-soft); font-size: 13px; border-radius: 16px; }
.chip.is-active { border-color: var(--ink); color: var(--ink); font-weight: 600; }

/* ---- Product grid / card ---- */
.product-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 28px; flex: 1; }
@media (max-width: 900px) { .product-grid { grid-template-columns: repeat(2, minmax(0,1fr)); } }
@media (max-width: 560px) { .product-grid { grid-template-columns: 1fr; } }
.product-card__thumb { position: relative; aspect-ratio: 1/1; background: var(--bg-white); border: 1px solid var(--border); display: flex; align-items: center; justify-content: center; overflow: hidden; }
.product-card__thumb img { width: 100%; height: 100%; object-fit: cover; }
.product-card__name { font-size: 15px; font-weight: 700; color: var(--ink); margin-bottom: 4px; }
.product-card__meta { font-size: 12.5px; color: var(--ink-mute); margin-bottom: 6px; }
.product-card__sku { font-size: 12px; color: var(--border-soft); }
.badge { display: inline-block; padding: 5px 10px; font-size: 11px; font-weight: 600; border-radius: 3px; }
.badge--3d { background: var(--blue); color: #fff; }
.badge--3d-abs { position: absolute; top: 12px; left: 12px; }
.badge--category { background: var(--accent-tint-bg); color: var(--accent-tint-text); }
.badge--tech { background: var(--blue-tint-bg); color: var(--blue); }
.toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; flex-wrap: wrap; gap: 10px; }

/* ---- Product detail ---- */
.product-detail { display: grid; grid-template-columns: 560px 1fr; gap: 64px; padding: 32px 64px 80px; }
@media (max-width: 1000px) { .product-detail { grid-template-columns: 1fr; padding: 24px 20px 48px; } }
.product-gallery__main { aspect-ratio: 1/1; background: var(--bg); border: 1px solid var(--border); display: flex; align-items: center; justify-content: center; margin-bottom: 16px; overflow: hidden; }
.product-gallery__main img { width: 100%; height: 100%; object-fit: cover; }
.product-gallery__thumbs { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; }
.product-gallery__thumb { width: 64px; height: 64px; padding: 0; background: var(--bg-white); border: 1.5px solid var(--border); cursor: pointer; overflow: hidden; }
.product-gallery__thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.product-gallery__thumb.is-active { border-color: var(--ink); }
.spec-row { display: flex; padding: 13px 0; border-bottom: 1px solid var(--border); }
.spec-row .k { width: 140px; font-size: 13.5px; color: var(--ink-mute); }
.spec-row .v { font-size: 13.5px; color: var(--ink); }
.related-grid { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 24px; }
@media (max-width: 700px) { .related-grid { grid-template-columns: repeat(2, minmax(0,1fr)); } }

/* ---- Materials page ---- */
.material-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 24px; padding: 40px 64px 96px; }
@media (max-width: 900px) { .material-grid { grid-template-columns: 1fr 1fr; padding: 24px 20px 56px; } }
@media (max-width: 560px) { .material-grid { grid-template-columns: 1fr; } }
.material-card { background: var(--bg-white); border: 1px solid var(--border); padding: 26px; }
.material-card__code { font-family: var(--font-mono); font-size: 13px; color: var(--accent); font-weight: 600; margin-bottom: 10px; }
.material-card__name { font-size: 16px; font-weight: 700; color: var(--ink); margin-bottom: 8px; }
.material-card__desc { font-size: 13.5px; color: var(--ink-soft); line-height: 1.7; }

/* ---- Forms ---- */
.field-label { font-size: 13px; font-weight: 600; color: var(--ink); margin-bottom: 8px; display: block; }
.field { width: 100%; padding: 13px 14px; border: 1.5px solid var(--border); border-radius: 6px; font-size: 14.5px; color: var(--ink); font-family: var(--font-body); background: var(--bg-white); }
textarea.field { resize: vertical; min-height: 120px; }
select.field { appearance: auto; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 22px; }
@media (max-width: 640px) { .field-row { grid-template-columns: 1fr; } }
.field-group { margin-bottom: 22px; }
.alert { padding: 16px 18px; border-radius: 6px; font-size: 13.5px; line-height: 1.7; margin-bottom: 24px; }
.alert--success { background: #E4EEE6; color: #2E5C3A; }
.alert--error { background: #F5E3DD; color: #9C4517; }
.alert--info { background: var(--blue-tint-bg); color: var(--blue); }

/* ---- Inquiry layout ---- */
.inquiry-layout { display: grid; grid-template-columns: 1fr 380px; gap: 48px; padding: 0 64px 100px; align-items: start; }
@media (max-width: 1000px) { .inquiry-layout { grid-template-columns: 1fr; padding: 0 20px 56px; } }
.inquiry-form-card { background: var(--bg-white); border: 1px solid var(--border); padding: 44px; }
@media (max-width: 640px) { .inquiry-form-card { padding: 24px; } }
.attached-design-card { background: var(--bg-white); border: 1px solid var(--border); padding: 26px; }

/* ---- Designer page ---- */
.designer-shell { background: #F7F7F5; width: 100%; min-height: 640px; display: flex; flex-direction: column; }
.designer-appbar { display: flex; align-items: center; justify-content: space-between; padding: 18px 40px; background: var(--bg-white); border-bottom: 1px solid var(--border); flex-wrap: wrap; gap: 14px; }
@media (max-width: 900px) { .designer-appbar { padding: 14px 20px; } }
.designer-workspace { display: flex; flex: 1; min-height: 560px; flex-wrap: wrap; }
.designer-viewport { flex: 1 1 480px; position: relative; background: #EEEEEA; display: flex; align-items: center; justify-content: center; min-height: 420px; }
.designer-sidebar { width: 380px; flex: 0 0 auto; background: var(--bg-white); border-left: 1px solid var(--border); padding: 28px 28px 24px; }
@media (max-width: 900px) { .designer-sidebar { width: 100%; border-left: none; border-top: 1px solid var(--border); } }
.designer-param-group { margin-bottom: 30px; }
.designer-param-heading { font-size: 12.5px; font-weight: 700; color: var(--ink); letter-spacing: .06em; margin-bottom: 14px; }
.designer-slider-row { margin-bottom: 20px; }
.designer-slider-row .top { display: flex; justify-content: space-between; margin-bottom: 10px; }
.designer-slider-row .top span:first-child { font-size: 13.5px; color: var(--ink-soft); }
.designer-slider-row .top span:last-child { font-family: var(--font-mono); font-size: 13px; color: var(--ink); font-weight: 600; }
input[type="range"] { -webkit-appearance: none; appearance: none; width: 100%; height: 4px; background: var(--border); border-radius: 2px; outline: none; }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 18px; height: 18px; border-radius: 50%; background: var(--blue); border: 3px solid #fff; box-shadow: 0 0 0 1px var(--blue); cursor: pointer; }
input[type="range"]::-moz-range-thumb { width: 18px; height: 18px; border-radius: 50%; background: var(--blue); border: 3px solid #fff; box-shadow: 0 0 0 1px var(--blue); cursor: pointer; }
.swatch-row { display: flex; gap: 12px; flex-wrap: wrap; }
.swatch { width: 32px; height: 32px; border-radius: 50%; border: 1px solid var(--border); cursor: pointer; padding: 0; box-shadow: none; }
.swatch.is-active { box-shadow: 0 0 0 2px #fff, 0 0 0 3.5px var(--blue); }
.swatch--picker { display: inline-block; vertical-align: middle; position: relative; overflow: hidden; background: conic-gradient(from 0deg, #E23B3B, #E2C23B, #6FCB4B, #3BB3E2, #6B4BE2, #E23B9E, #E23B3B); }
.swatch--picker input[type="color"] { position: absolute; inset: 0; width: 100%; height: 100%; padding: 0; border: none; cursor: pointer; opacity: 0; }
.option-pill-row { display: flex; gap: 8px; flex-wrap: wrap; }
.option-pill { padding: 9px 14px; border: 1.5px solid var(--border); color: var(--ink-soft); font-size: 13px; border-radius: 16px; background: var(--bg-white); cursor: pointer; }
.option-pill.is-active { border-color: var(--blue); background: var(--blue-tint-bg); color: var(--blue); font-weight: 600; }
.designer-current-spec { padding: 18px 20px; background: #F7F7F5; border: 1px solid var(--border); }
.designer-current-spec__heading { font-size: 11.5px; font-weight: 700; color: var(--ink); letter-spacing: .06em; margin-bottom: 10px; }
.designer-sidebar.is-readonly { pointer-events: none; opacity: .8; }
#designer-canvas-wrap { width: 100%; height: 100%; min-height: 420px; }
#designer-canvas-wrap canvas { display: block; }

/* ---- Utility ---- */
.mt-0 { margin-top: 0; }
.text-center { text-align: center; }
.empty-state { padding: 60px 20px; text-align: center; color: var(--ink-mute); }

/* ---- 即時客服浮動按鈕（Tawk.to 實際聊天視窗是跨網域 iframe，外觀改不了；
   這顆按鈕是我們自己畫的、完全跟站內視覺一致，點下去才用 Tawk_API 開真正的聊天視窗，
   聊天視窗打開時會自動隱藏這顆按鈕，避免兩顆同時疊在同一個角落）---- */
.chat-fab-wrap {
  position: fixed;
  right: 20px;
  bottom: calc(20px + env(safe-area-inset-bottom, 0px));
  z-index: 45;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 12px;
}
@media (max-width: 640px) {
  .chat-fab-wrap { right: 14px; bottom: calc(14px + env(safe-area-inset-bottom, 0px)); }
}
.chat-fab-wrap.is-chat-open .chat-fab,
.chat-fab-wrap.is-chat-open .chat-fab__greeting { display: none; }

.chat-fab {
  appearance: none; -webkit-appearance: none;
  position: relative;
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--nav-bg);
  border: 1px solid var(--nav-border);
  color: var(--on-dark);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(23,20,15,.3), 0 2px 6px rgba(23,20,15,.2);
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
  padding: 0;
}
.chat-fab:hover, .chat-fab:focus-visible {
  transform: translateY(-3px);
  background: #221B14;
  box-shadow: 0 14px 30px rgba(23,20,15,.38), 0 0 0 3px var(--accent-tint-bg);
  outline: none;
}
.chat-fab:active { transform: translateY(-1px); }
.chat-fab svg { width: 24px; height: 24px; }

.chat-fab__dot {
  position: absolute; right: 2px; bottom: 2px;
  width: 12px; height: 12px; border-radius: 50%;
  background: #4CAF6D; border: 2px solid var(--nav-bg);
}
.chat-fab__badge {
  position: absolute; top: -4px; right: -4px;
  min-width: 20px; height: 20px; padding: 0 5px;
  border-radius: 10px;
  background: var(--accent); color: #fff;
  font-size: 11px; font-weight: 700; font-family: var(--font-mono);
  display: flex; align-items: center; justify-content: center;
  border: 2px solid var(--bg);
}
/* .chat-fab__badge 上面設了 display:flex，跟瀏覽器內建的 [hidden]{display:none} 特異度
   打平，載入順序又在後面會贏，導致 hidden 屬性失效、角標一直看得到——這裡用屬性選擇器
   把特異度提高，確保有 hidden 屬性時一定蓋掉 flex。 */
.chat-fab__badge[hidden] { display: none; }

.chat-fab__greeting {
  position: relative;
  max-width: 240px;
  background: var(--nav-bg);
  color: var(--on-dark);
  border: 1px solid var(--nav-border);
  border-radius: 14px 14px 4px 14px;
  padding: 14px 30px 14px 16px;
  font-size: 13.5px;
  line-height: 1.6;
  box-shadow: 0 12px 28px rgba(0,0,0,.28);
  animation: chatFabGreetingIn .25s ease;
}
.chat-fab__greeting-close {
  appearance: none; -webkit-appearance: none;
  position: absolute; top: 8px; right: 8px;
  width: 20px; height: 20px;
  display: flex; align-items: center; justify-content: center;
  color: var(--on-dark-muted);
  background: transparent; border: none; padding: 0; cursor: pointer;
  box-shadow: none;
}
.chat-fab__greeting-close:hover { color: var(--on-dark); }
@keyframes chatFabGreetingIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}