/* ==========================================================================
   unlocka33 — 站台樣式
   依賴 brand.css 的 token。這裡只放版面與元件，不重新定義品牌數值。
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 20px);
  scrollbar-gutter: stable;
}

body {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--body);
  font-weight: 300;
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; }
button, a {
  touch-action: manipulation;
  -webkit-tap-highlight-color: rgba(255, 196, 77, .16);
}
main:focus { outline: none; }

:focus-visible {
  outline: 2px solid var(--key);
  outline-offset: 4px;
  border-radius: 6px;
}

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 22px; }
.wrap-text { max-width: var(--wrap-text); }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap;
}

.skip-link {
  position: absolute; left: 12px; top: -60px; z-index: 100;
  background: var(--key); color: var(--ink);
  padding: 10px 18px; border-radius: 0 0 var(--r-sm) var(--r-sm);
  font-family: var(--sora); font-weight: 600; font-size: 14px;
  text-decoration: none; transition: top .2s;
}
.skip-link:focus { top: 0; }

/* 極輕的顆粒，讓大面積深底不至於死板 */
body::after {
  content: "";
  position: fixed; inset: 0; z-index: 1;
  pointer-events: none; opacity: .5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='.035'/%3E%3C/svg%3E");
}

/* ==========================================================================
   導覽
   ========================================================================== */

.nav {
  position: sticky; top: 0; z-index: 50;
  height: var(--nav-h);
  display: flex; align-items: center;
  border-bottom: 1px solid transparent;
  transition: background .3s, border-color .3s, backdrop-filter .3s;
}
.nav::after {
  content: "";
  position: absolute; left: 0; right: 0; bottom: -1px;
  height: 2px;
  background: var(--c, var(--key));
  transform: scaleX(var(--scroll-progress, 0));
  transform-origin: left center;
  opacity: .8;
  pointer-events: none;
}
.nav.is-stuck {
  background: color-mix(in srgb, var(--ink) 82%, transparent);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border-bottom-color: var(--line-soft);
}
.nav .wrap { display: flex; align-items: center; gap: 20px; }

.nav-brand {
  display: flex; align-items: center; gap: 9px;
  text-decoration: none; flex: none;
}
.nav-brand svg { width: 26px; height: 26px; flex: none; }
.nav-brand .wordmark { font-size: 18px; }

.nav-links {
  display: flex; align-items: center; gap: 4px;
  margin-left: auto; list-style: none;
}
.nav-links a {
  display: block;
  padding: 7px 13px; border-radius: 999px;
  font-size: 14px; font-weight: 400; text-decoration: none;
  color: var(--muted);
  transition: color .2s, background .2s;
}
.nav-links a:hover { color: var(--paper); background: rgba(158, 149, 204, .1); }
.nav-links a:active { color: var(--paper); background: rgba(158, 149, 204, .16); transform: scale(.97); }
.nav-links a[aria-current] {
  color: var(--paper);
  background: rgba(158, 149, 204, .12);
  box-shadow: inset 0 0 0 1px var(--line-soft);
}

.lang-toggle {
  flex: none;
  display: flex; align-items: center; gap: 6px;
  min-height: 40px;
  padding: 7px 14px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-family: var(--mono); font-size: 11px; letter-spacing: .1em;
  cursor: pointer;
  transition: color .2s, border-color .2s;
}
.lang-toggle:hover { color: var(--key); border-color: var(--key); }
.lang-toggle:active { transform: scale(.97); }

/* 手機：縮成單列黏頂導覽，隨時都能換區，不占掉第二列空間 */
@media (max-width: 720px) {
  html { scroll-padding-top: calc(var(--nav-h) + 14px); }
  body::after { position: absolute; opacity: .34; }

  .nav {
    height: var(--nav-h); padding: 0;
    position: sticky;
  }
  .nav.is-stuck {
    background: color-mix(in srgb, var(--ink) 96%, transparent);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
  .nav .wrap { flex-wrap: nowrap; gap: 5px; padding: 0 12px; }
  .nav-brand {
    width: 42px; min-height: 44px;
    justify-content: center;
  }
  .nav-brand .wordmark { display: none; }
  .nav-links {
    width: auto; min-width: 0;
    margin-left: auto; gap: 0;
  }
  .nav-links a {
    display: inline-flex; align-items: center;
    min-height: 44px;
    white-space: nowrap; font-size: 12.5px; padding: 7px 9px;
  }
  .lang-toggle {
    min-height: 44px;
    margin-left: 2px; padding: 7px 9px;
    letter-spacing: .06em;
  }

  .hero::before { animation: none; height: 610px; }
}

@media (max-width: 360px) {
  .nav .wrap { padding: 0 8px; gap: 2px; }
  .nav-brand { width: 38px; }
  .nav-links a { font-size: 11.5px; padding-inline: 7px; }
  .lang-toggle { font-size: 10px; padding-inline: 7px; letter-spacing: .03em; }
}

/* ==========================================================================
   區塊節奏
   ========================================================================== */

main { flex: 1 0 auto; position: relative; z-index: 2; }

section { padding: 76px 0; }
@media (max-width: 720px) { section { padding: 54px 0; } }

.eyebrow {
  font-family: var(--mono); font-size: 11px;
  letter-spacing: .18em; text-transform: uppercase;
  color: var(--muted);
}

h1, h2, h3, h4 { font-family: var(--sora); letter-spacing: -.02em; line-height: 1.22; }

h2 {
  font-weight: 600;
  font-size: clamp(1.5rem, 4.4vw, 2.3rem);
  margin: 22px 0 14px;
}
h3 { font-weight: 600; font-size: 1.1rem; }

.lede {
  color: var(--muted);
  font-size: clamp(1rem, 2.4vw, 1.08rem);
  max-width: 56ch;
}
.lede b, .lede strong { font-weight: 500; color: var(--paper); }

.prose p { margin-bottom: 1.1em; color: var(--text-dim); }
.prose p:last-child { margin-bottom: 0; }
.prose b, .prose strong { font-weight: 500; color: var(--paper); }

/* 按鈕 */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  min-height: 48px;
  padding: 13px 26px; border-radius: 999px;
  font-family: var(--sora); font-weight: 600; font-size: 15px;
  text-decoration: none; cursor: pointer;
  border: 1px solid transparent;
  transition: transform .25s cubic-bezier(.34, 1.4, .5, 1), background .25s, border-color .25s, color .25s;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0) scale(.98); }
.btn-primary { background: var(--key); color: var(--ink); }
.btn-primary:hover { background: color-mix(in srgb, var(--key) 85%, #fff); }
.btn-ghost { border-color: var(--line); color: var(--paper); }
.btn-ghost:hover { border-color: var(--muted); background: rgba(158, 149, 204, .08); }
.btn-accent { background: var(--c); color: var(--ink); }
.btn-accent:hover { background: color-mix(in srgb, var(--c) 85%, #fff); }

.btn-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

/* ==========================================================================
   首頁 Hero
   ========================================================================== */

.hero {
  position: relative;
  padding: clamp(48px, 9vw, 96px) 0 clamp(60px, 10vw, 104px);
  text-align: center;
  overflow: hidden;
}

/* 極光。三團色斑非常慢地漂移，深色底才有空氣感。 */
.hero::before {
  content: "";
  position: absolute; inset: -30% -20% auto; height: 780px;
  pointer-events: none;
  background:
    radial-gradient(ellipse 40% 42% at 50% 58%, rgba(255, 196, 77, .17), transparent 70%),
    radial-gradient(ellipse 34% 36% at 22% 44%, rgba(91, 132, 255, .13), transparent 72%),
    radial-gradient(ellipse 34% 36% at 79% 50%, rgba(174, 92, 255, .12), transparent 72%);
  animation: aurora 26s ease-in-out infinite alternate;
}
@keyframes aurora {
  from { transform: translate3d(-2%, 0, 0) scale(1); }
  to   { transform: translate3d(2%, 2%, 0) scale(1.08); }
}

.hero .wrap { position: relative; z-index: 1; }

.hero-mark {
  width: min(46vw, 168px); height: auto;
  margin: 0 auto clamp(22px, 4vw, 34px);
  cursor: pointer;
}
.hero .wordmark { font-size: clamp(2.6rem, 11vw, 5rem); }

.hero-tagline {
  margin-top: 20px;
  font-size: clamp(1.05rem, 4vw, 1.4rem);
  font-weight: 400;
}
.hero-tagline-en {
  margin-top: 8px;
  font-family: var(--sora); font-weight: 300;
  font-size: 13px; letter-spacing: .32em; text-transform: uppercase;
  color: var(--muted);
}
/* 英文版的主標語已經是這一句了，不要再重複一次 */
html[data-lang="en"] .hero-tagline-en { display: none; }
.hero-sub {
  margin: 26px auto 0;
  max-width: 46ch;
  color: var(--muted);
  font-size: clamp(.95rem, 2.6vw, 1.05rem);
}
.hero .btn-row { justify-content: center; }
.hero-hint {
  margin-top: 26px;
  font-family: var(--mono); font-size: 11px;
  letter-spacing: .14em; color: var(--muted); opacity: .7;
}

/* ==========================================================================
   品牌敘事
   ========================================================================== */

.story {
  display: grid; gap: clamp(28px, 5vw, 56px);
  align-items: center;
  margin-top: 34px;
}
@media (min-width: 820px) { .story { grid-template-columns: 1.15fr .85fr; } }

.story-figure {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: clamp(24px, 5vw, 44px);
  display: grid; place-items: center;
}
.story-figure svg { width: 100%; max-width: 240px; }
.grid-line { stroke: rgba(158, 149, 204, .3); stroke-width: .7; fill: none; }
.grid-dash { stroke: var(--key); stroke-width: .9; stroke-dasharray: 3 3; fill: none; opacity: .55; }
.measure { font-family: var(--mono); font-size: 6.5px; fill: var(--muted); letter-spacing: .05em; }

/* ==========================================================================
   產品家族牆
   ========================================================================== */

.family {
  display: grid; gap: 14px;
  margin-top: 36px;
  grid-template-columns: repeat(auto-fill, minmax(158px, 1fr));
}

.family-toolbar {
  display: none;
  align-items: center; justify-content: space-between; gap: 16px;
  margin-top: 28px;
}
.family-toolbar.is-ready { display: flex; }
.family-toolbar.is-ready + .family { margin-top: 18px; }
.family-filters {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in srgb, var(--ink-2) 78%, transparent);
}
.filter-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  min-height: 40px;
  padding: 7px 14px;
  border: 0; border-radius: 999px;
  background: transparent; color: var(--muted);
  font-family: var(--sora); font-size: 13px; font-weight: 500;
  cursor: pointer;
  transition: background .2s, color .2s, transform .2s;
}
.filter-btn:hover { color: var(--paper); }
.filter-btn:active { transform: scale(.97); }
.filter-btn[aria-pressed="true"] {
  color: var(--ink);
  background: var(--key);
  box-shadow: 0 5px 18px -10px var(--key);
}
.filter-btn .count {
  font-family: var(--mono); font-size: 10px;
  opacity: .72;
}
.filter-summary {
  display: flex; align-items: baseline; gap: 6px;
  color: var(--muted);
  font-size: 12px;
}
.filter-count { color: var(--paper); font-family: var(--mono); }
.prod-card[hidden] { display: none; }

.prod-card {
  position: relative;
  display: flex; flex-direction: column; align-items: center;
  text-align: center; text-decoration: none;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 24px 15px 20px;
  transition: transform .3s cubic-bezier(.34, 1.4, .5, 1), border-color .3s, background .3s;
}
.prod-card:hover,
.prod-card:focus-visible {
  transform: translateY(-6px);
  border-color: var(--c);
  background: color-mix(in srgb, var(--c) 5%, var(--ink-2));
}
.prod-card:active { transform: translateY(-2px) scale(.985); }
.prod-card .tile { width: 74px; height: 74px; margin-bottom: 16px; }
.prod-card .kind {
  font-family: var(--mono); font-size: 9.5px;
  letter-spacing: .18em; text-transform: uppercase;
  color: var(--muted); display: block; margin-bottom: 5px;
}
.prod-card h3 { font-size: 15px; font-weight: 600; }
.prod-card h3 em { font-style: normal; color: var(--c); }
.prod-card p { font-size: 12.5px; color: var(--muted); margin-top: 5px; line-height: 1.55; }

.prod-card.is-soon { opacity: .72; }
.prod-card.is-soon:hover { opacity: 1; }
.badge-soon {
  position: absolute; top: 12px; right: 12px;
  font-family: var(--mono); font-size: 8.5px;
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 8px;
}

/* ==========================================================================
   技術可信度
   ========================================================================== */

.tech {
  display: grid; gap: 12px;
  margin-top: 34px;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
}
.tech-item {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 22px 20px;
  background: linear-gradient(160deg, var(--ink-2), color-mix(in srgb, var(--ink-2) 55%, var(--ink)));
}
.tech-item .n {
  font-family: var(--mono); font-size: 11px;
  letter-spacing: .16em; color: var(--key); display: block; margin-bottom: 10px;
}
.tech-item h3 { font-size: 15.5px; margin-bottom: 6px; }
.tech-item p { font-size: 13.5px; color: var(--muted); line-height: 1.6; }

/* ==========================================================================
   產品頁
   ========================================================================== */

.p-hero {
  position: relative;
  padding: clamp(40px, 7vw, 76px) 0 clamp(36px, 6vw, 64px);
  overflow: hidden;
}
.p-hero::before {
  content: "";
  position: absolute; inset: -50% 0 auto; height: 620px;
  pointer-events: none;
  background: radial-gradient(ellipse 42% 46% at 50% 62%, color-mix(in srgb, var(--c) 18%, transparent), transparent 70%);
}
.p-hero .wrap { position: relative; z-index: 1; }

.p-hero-inner {
  display: grid; gap: clamp(24px, 4vw, 44px);
  align-items: center;
}
@media (min-width: 760px) { .p-hero-inner { grid-template-columns: auto 1fr; } }

.p-hero .tile { width: clamp(96px, 22vw, 132px); height: clamp(96px, 22vw, 132px); }

.p-name {
  font-family: var(--sora); font-weight: 700;
  font-size: clamp(2rem, 7vw, 3.2rem);
  letter-spacing: -.035em; line-height: 1.05;
}
.p-name em { font-style: normal; color: var(--c); }
.p-kind {
  font-family: var(--mono); font-size: 11px;
  letter-spacing: .2em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 12px;
}
.p-tagline {
  margin-top: 16px;
  font-size: clamp(1.02rem, 3vw, 1.22rem);
  color: var(--text-dim);
  max-width: 44ch;
}
.p-status {
  display: inline-flex; align-items: center; gap: 8px;
  margin-top: 20px; padding: 6px 15px;
  border: 1px solid var(--line); border-radius: 999px;
  font-family: var(--mono); font-size: 11px; letter-spacing: .12em;
  color: var(--muted);
}
.p-status::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--c); box-shadow: 0 0 8px var(--c);
}

/* 功能區塊 */
.features { display: grid; gap: 14px; margin-top: 36px; }
@media (min-width: 760px) { .features { grid-template-columns: 1fr 1fr; } }

.feature {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 28px 26px;
  transition: border-color .3s, transform .3s cubic-bezier(.34, 1.4, .5, 1);
}
.feature:hover { border-color: color-mix(in srgb, var(--c) 55%, var(--line)); transform: translateY(-3px); }
.feature .n {
  font-family: var(--mono); font-size: 11px;
  letter-spacing: .16em; color: var(--c);
  display: block; margin-bottom: 12px;
}
.feature h3 { font-size: 1.05rem; margin-bottom: 9px; }
.feature p { font-size: 14.5px; color: var(--muted); line-height: 1.7; }
.feature.is-wide { grid-column: 1 / -1; }

/* 產品頁的設計取捨面板：單獨一塊，寬度收窄免得行太長 */
.note-panel {
  max-width: var(--wrap-text);
  margin-top: 34px;
}

/* 兩欄（品牌頁還在用） */
.split { display: grid; gap: 16px; margin-top: 34px; }
@media (min-width: 820px) { .split { grid-template-columns: 1fr 1fr; align-items: start; } }

.panel {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 28px 26px;
}
.panel.is-light {
  background: var(--paper); border-color: transparent; color: var(--ink);
  --mark-stroke: var(--ink);   /* 見 brand.css：<use> 的 shadow tree 只吃自訂屬性 */
}
.panel.is-light .wordmark .num { color: var(--key-ink); }

/* 截圖佔位 */
/* 上限鎖在 210px：手機截圖是 9:19.5，再寬就會高得佔掉整個視窗 */
.shots {
  display: grid; gap: 16px; margin-top: 30px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 210px));
  justify-content: start;
}
.shot {
  aspect-ratio: 9 / 19.5;
  border-radius: var(--r-lg);
  border: 1px dashed var(--line);
  background: linear-gradient(165deg, color-mix(in srgb, var(--c) 6%, var(--ink-2)), var(--ink-3));
  display: grid; place-items: center;
  color: var(--muted);
  font-family: var(--mono); font-size: 11px; letter-spacing: .12em;
  text-align: center; padding: 16px;
}
.shot img { width: 100%; height: 100%; object-fit: cover; border-radius: inherit; }

/* 上下頁 */
.pager {
  display: flex; flex-wrap: wrap; gap: 12px;
  justify-content: space-between; align-items: center;
  margin-top: 20px; padding-top: 30px;
  border-top: 1px solid var(--line);
}
.pager a {
  display: inline-flex; align-items: center; gap: 9px;
  min-height: 44px;
  text-decoration: none; color: var(--muted);
  font-size: 14px;
  transition: color .2s;
}
.pager a:hover { color: var(--paper); }
.pager a:active { transform: scale(.98); }
.pager a svg { width: 20px; height: 20px; }

@media (max-width: 560px) {
  .pager a:first-child,
  .pager a:last-child { max-width: 46%; }
  .pager a:first-child span,
  .pager a:last-child span {
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  }
  .pager a:nth-child(2) {
    order: 3; flex-basis: 100%; justify-content: center;
    border-top: 1px solid var(--line-soft);
  }
}

/* ==========================================================================
   品牌頁
   ========================================================================== */

.swatches {
  display: grid; gap: 10px; margin-top: 30px;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
}
.sw {
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  padding: 16px 14px;
  min-height: 112px;
  display: flex; flex-direction: column; justify-content: flex-end;
}
.sw b { font-family: var(--sora); font-weight: 600; font-size: 13px; display: block; }
.sw code { font-family: var(--mono); font-size: 10.5px; opacity: .74; letter-spacing: .03em; }

.rules { display: grid; gap: 14px; margin-top: 30px; }
@media (min-width: 760px) { .rules { grid-template-columns: 1fr 1fr; } }
.rule {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 24px 22px;
}
.rule h3 {
  font-size: 12px; font-weight: 600;
  letter-spacing: .14em; text-transform: uppercase;
  margin-bottom: 14px;
}
.rule.is-do h3   { color: var(--care); }
.rule.is-dont h3 { color: var(--quest); }
.rule ul { list-style: none; font-size: 14.5px; }
.rule li { padding: 8px 0 8px 22px; position: relative; color: var(--text-dim); }
.rule li::before { position: absolute; left: 0; top: 8px; font-family: var(--mono); font-size: 12px; }
.rule.is-do li::before   { content: "+"; color: var(--care); }
.rule.is-dont li::before { content: "\00d7"; color: var(--quest); }

.lockups { display: grid; gap: 16px; margin-top: 30px; }
@media (min-width: 760px) { .lockups { grid-template-columns: 1.4fr 1fr; } }
.lockup {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 8px;
  min-height: 190px;
}
.lk { display: flex; align-items: center; gap: 14px; }
.lk svg { width: 58px; height: 58px; flex: none; }
.lk .wordmark { font-size: 27px; }
.lk.is-stack { flex-direction: column; gap: 13px; }
.lk.is-stack svg { width: 68px; height: 68px; }
.cap {
  font-family: var(--mono); font-size: 10.5px;
  letter-spacing: .16em; text-transform: uppercase;
  color: var(--muted); margin-top: 14px;
}
.panel.is-light .cap { color: #7A70A8; }

/* 12 顆圖示排在一起，用來驗證墨色重量是否一致 */
.icon-wall {
  display: grid; gap: 14px; margin-top: 30px;
  grid-template-columns: repeat(auto-fill, minmax(92px, 1fr));
}
.icon-wall figure { text-align: center; }
.icon-wall .tile { width: 100%; aspect-ratio: 1; margin-bottom: 10px; }
.icon-wall figcaption {
  font-family: var(--mono); font-size: 9.5px;
  letter-spacing: .1em; text-transform: uppercase; color: var(--muted);
}

.asset-list { display: grid; gap: 10px; margin-top: 26px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.asset {
  display: flex; align-items: center; gap: 14px;
  border: 1px solid var(--line); border-radius: var(--r-sm);
  padding: 14px 16px; text-decoration: none;
  transition: border-color .25s, background .25s;
}
.asset:hover { border-color: var(--key); background: rgba(255, 196, 77, .05); }
.asset svg { width: 30px; height: 30px; flex: none; }
.asset b { font-family: var(--sora); font-weight: 600; font-size: 14px; display: block; }
.asset span { font-family: var(--mono); font-size: 10.5px; color: var(--muted); letter-spacing: .06em; }

/* ==========================================================================
   CTA + 頁尾
   ========================================================================== */

.cta {
  text-align: center;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: clamp(36px, 6vw, 64px) 26px;
  background: linear-gradient(165deg, var(--ink-2), var(--ink-3));
}
.cta h2 { margin-top: 0; }
.cta .btn-row { justify-content: center; }

footer {
  position: relative; z-index: 2;
  flex: none;
  padding: 52px 0 64px;
  margin-top: 40px;
  border-top: 1px solid var(--line-soft);
  color: var(--muted); font-size: 13px;
}
.foot-top {
  display: flex; flex-wrap: wrap; gap: 26px;
  justify-content: space-between; align-items: flex-start;
}
.foot-brand { display: flex; align-items: center; gap: 11px; }
.foot-brand svg { width: 30px; height: 30px; }
.foot-brand .wordmark { font-size: 19px; }
.foot-cols { display: flex; flex-wrap: wrap; gap: 44px; }
.foot-col h4 {
  font-family: var(--mono); font-size: 10.5px; font-weight: 400;
  letter-spacing: .16em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 12px;
}
.foot-col ul { list-style: none; display: grid; gap: 7px; }
.foot-col a { text-decoration: none; color: var(--text-dim); font-size: 13.5px; transition: color .2s; }
.foot-col a:hover { color: var(--key); }
.foot-bot {
  margin-top: 38px; padding-top: 22px;
  border-top: 1px solid var(--line-soft);
  display: flex; flex-wrap: wrap; gap: 10px; justify-content: space-between;
  font-size: 12.5px;
}

/* 長頁快速回頂；由 JS 漸進增強建立，沒有 JS 不影響內容。 */
.back-to-top {
  position: fixed;
  right: max(18px, env(safe-area-inset-right));
  bottom: max(18px, env(safe-area-inset-bottom));
  z-index: 45;
  width: 48px; height: 48px;
  display: grid; place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: color-mix(in srgb, var(--ink-2) 92%, transparent);
  color: var(--paper);
  box-shadow: 0 14px 36px -16px rgba(0, 0, 0, .65);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font-family: var(--sora); font-size: 20px; line-height: 1;
  cursor: pointer;
  opacity: 0; visibility: hidden; pointer-events: none;
  transform: translateY(12px) scale(.92);
  transition: opacity .22s, visibility .22s, transform .22s, border-color .2s, color .2s;
}
.back-to-top.is-visible {
  opacity: 1; visibility: visible; pointer-events: auto;
  transform: none;
}
.back-to-top:hover { color: var(--key); border-color: var(--key); }
.back-to-top:active { transform: scale(.94); }

@media (max-width: 720px) {
  .family-toolbar { align-items: stretch; flex-direction: column; gap: 10px; }
  .family-filters { width: 100%; }
  .filter-btn { flex: 1; min-width: 0; min-height: 44px; padding-inline: 8px; }
  .filter-summary { align-self: flex-end; }
  .back-to-top {
    right: max(14px, env(safe-area-inset-right));
    bottom: max(14px, env(safe-area-inset-bottom));
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: var(--ink-2);
  }
  .foot-cols { width: 100%; display: grid; grid-template-columns: 1fr 1fr; gap: 26px 34px; }
  .foot-col:last-child { grid-column: 1 / -1; }
}

@media (max-width: 360px) {
  .filter-btn { font-size: 12px; }
  .filter-btn .count { display: none; }
}

@media (hover: none) {
  .feature:hover { border-color: var(--line); transform: none; }
  .prod-card:hover { transform: none; border-color: var(--line); background: var(--ink-2); }
  .prod-card.is-soon:hover { opacity: .72; }
}

/* ==========================================================================
   捲動進場
   ========================================================================== */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .6s ease, transform .6s cubic-bezier(.22, .8, .3, 1);
}
.reveal.is-in { opacity: 1; transform: none; }

/* JS 沒跑（或被關掉）時，內容必須照樣看得到 */
.no-js .reveal { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .mk-draw .mk { stroke-dashoffset: 0; }
  .reveal { opacity: 1; transform: none; }
}