/* =========================================================
   kaovo — 單頁官網 mock v1
   純靜態 · Cloudflare Pages ready · RWD 手機優先
   亮/暗雙色：預設跟系統(prefers-color-scheme)，data-theme 可覆蓋
   ========================================================= */

/* ---------- Design tokens ---------- */
:root {
  /* 中性色（亮色為預設值） */
  --bg:        #f7f6f3;
  --bg-2:      #ffffff;
  --surface:   #ffffff;
  --surface-2: #f2f0eb;
  --text:      #17171a;
  --text-2:    #55555f;
  --muted:     #8a8a94;
  --border:    #e6e3dc;
  --border-2:  #ededed;

  /* 品牌強調色 */
  --accent:    #5b57f5;   /* indigo/violet */
  --accent-2:  #12b5c9;   /* teal/cyan */
  --accent-ink:#ffffff;
  --grad: linear-gradient(115deg, var(--accent) 0%, var(--accent-2) 100%);

  /* 語意 */
  --warm:      #d97706;
  --core:      #7c74ff;

  --radius:    18px;
  --radius-sm: 11px;
  --shadow:    0 1px 2px rgba(20,20,30,.05), 0 12px 32px -14px rgba(20,20,40,.14);
  --shadow-lg: 0 2px 4px rgba(20,20,30,.06), 0 30px 60px -22px rgba(20,20,40,.24);

  --maxw: 1080px;
  --font-latin: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  --font: var(--font-latin), -apple-system, BlinkMacSystemFont, "Segoe UI",
          "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", "Heiti TC",
          "Helvetica Neue", Arial, sans-serif;
}

/* 暗色：跟系統 */
@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #0c0d11;
    --bg-2:      #101118;
    --surface:   #14151d;
    --surface-2: #191b24;
    --text:      #ececf1;
    --text-2:    #a9abb8;
    --muted:     #71737f;
    --border:    #23252f;
    --border-2:  #202129;
    --accent:    #7b78ff;
    --accent-2:  #2dd4e6;
    --warm:      #f0a12e;
    --core:      #8f88ff;
    --shadow:    0 1px 2px rgba(0,0,0,.4), 0 14px 34px -16px rgba(0,0,0,.6);
    --shadow-lg: 0 2px 4px rgba(0,0,0,.5), 0 34px 64px -22px rgba(0,0,0,.7);
  }
}

/* 手動覆蓋（三態：auto 不設值 → 跟系統；light/dark 明確覆蓋） */
:root[data-theme="light"] {
  --bg:#f7f6f3; --bg-2:#ffffff; --surface:#ffffff; --surface-2:#f2f0eb;
  --text:#17171a; --text-2:#55555f; --muted:#8a8a94; --border:#e6e3dc; --border-2:#ededed;
  --accent:#5b57f5; --accent-2:#12b5c9; --warm:#d97706; --core:#7c74ff;
  --shadow:0 1px 2px rgba(20,20,30,.05), 0 12px 32px -14px rgba(20,20,40,.14);
  --shadow-lg:0 2px 4px rgba(20,20,30,.06), 0 30px 60px -22px rgba(20,20,40,.24);
}
:root[data-theme="dark"] {
  --bg:#0c0d11; --bg-2:#101118; --surface:#14151d; --surface-2:#191b24;
  --text:#ececf1; --text-2:#a9abb8; --muted:#71737f; --border:#23252f; --border-2:#202129;
  --accent:#7b78ff; --accent-2:#2dd4e6; --warm:#f0a12e; --core:#8f88ff;
  --shadow:0 1px 2px rgba(0,0,0,.4), 0 14px 34px -16px rgba(0,0,0,.6);
  --shadow-lg:0 2px 4px rgba(0,0,0,.5), 0 34px 64px -22px rgba(0,0,0,.7);
}

/* ---------- Reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3 { line-height: 1.2; margin: 0; letter-spacing: -.01em; font-weight: 600; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
img, svg { max-width: 100%; display: block; }
ul { margin: 0; padding: 0; list-style: none; }

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

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--accent); color: var(--accent-ink);
  padding: 10px 16px; border-radius: 0 0 10px 0; font-size: 14px;
}
.skip-link:focus { left: 0; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 62px;
}
.wordmark {
  font-family: var(--font-latin);
  font-weight: 700; font-size: 22px; letter-spacing: -.02em;
  color: var(--text);
}
.wordmark::after { content: "."; color: var(--accent); }
.wordmark--sm { font-size: 19px; }

.nav { display: flex; align-items: center; gap: 6px; }
.nav > a {
  padding: 8px 12px; font-size: 15px; color: var(--text-2);
  border-radius: 9px; transition: color .15s, background .15s;
}
.nav > a:hover { color: var(--text); background: var(--surface-2); }

.theme-toggle {
  display: inline-flex; align-items: center; gap: 8px;
  margin-left: 6px; padding: 7px 13px 7px 11px;
  font-family: var(--font); font-size: 14px; color: var(--text-2);
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 999px; cursor: pointer;
  transition: color .15s, border-color .15s, background .15s;
}
.theme-toggle:hover { color: var(--text); border-color: var(--accent); }
.theme-toggle__dot {
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--grad);
  box-shadow: inset 0 0 0 2px var(--surface);
}
@media (max-width: 460px) { .theme-toggle__label { display: none; } }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; }
.hero__bg {
  position: absolute; inset: -20% -10% auto -10%; height: 130%;
  z-index: 0; pointer-events: none;
  background:
    radial-gradient(42% 55% at 18% 8%,  color-mix(in srgb, var(--accent) 30%, transparent) 0%, transparent 60%),
    radial-gradient(40% 50% at 88% 4%,  color-mix(in srgb, var(--accent-2) 26%, transparent) 0%, transparent 58%),
    radial-gradient(60% 60% at 60% 100%, color-mix(in srgb, var(--accent) 12%, transparent) 0%, transparent 70%);
  opacity: .9;
}
.hero__bg::after {
  /* 細格線紋理 */
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, color-mix(in srgb, var(--text) 5%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in srgb, var(--text) 5%, transparent) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(80% 70% at 50% 30%, #000 0%, transparent 80%);
  -webkit-mask-image: radial-gradient(80% 70% at 50% 30%, #000 0%, transparent 80%);
}
.hero__inner {
  position: relative; z-index: 1;
  padding-top: clamp(64px, 12vw, 128px);
  padding-bottom: clamp(56px, 10vw, 104px);
  max-width: 840px;
}
.hero__eyebrow {
  display: inline-block;
  font-family: var(--font-latin); font-size: 13px; letter-spacing: .08em;
  text-transform: uppercase; color: var(--text-2);
  padding: 6px 13px; margin-bottom: 22px;
  border: 1px solid var(--border); border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 60%, transparent);
}
.hero__title {
  font-size: clamp(34px, 7vw, 62px);
  font-weight: 700; letter-spacing: -.025em; line-height: 1.08;
}
.grad {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.hero__lede {
  margin-top: 24px;
  font-size: clamp(16.5px, 2.4vw, 20px);
  color: var(--text-2); max-width: 60ch;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--font); font-size: 15.5px; font-weight: 500;
  padding: 13px 22px; border-radius: 12px;
  border: 1px solid transparent; cursor: pointer;
  transition: transform .12s ease, box-shadow .15s, background .15s, border-color .15s;
}
.btn:active { transform: translateY(1px); }
.btn--primary {
  color: var(--accent-ink); background: var(--grad);
  box-shadow: 0 10px 26px -12px color-mix(in srgb, var(--accent) 80%, transparent);
}
.btn--primary:hover { box-shadow: 0 16px 34px -12px color-mix(in srgb, var(--accent) 85%, transparent); }
.btn--ghost {
  color: var(--text); background: var(--surface); border-color: var(--border);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Sections ---------- */
.section { padding-block: clamp(56px, 9vw, 100px); }
.section--concept {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
}
.section-head { margin-bottom: 38px; }
.section-title { font-size: clamp(26px, 4.4vw, 38px); font-weight: 700; letter-spacing: -.02em; }
.section-sub { color: var(--muted); font-size: 15px; margin-top: 8px; }

/* ---------- Cards grid ---------- */
.cards {
  display: grid; gap: 22px;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}
.card {
  display: flex; flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .2s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }

.card__cover {
  position: relative; aspect-ratio: 16 / 9;
  display: grid; place-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--border-2);
}
.card__cover::after {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.14) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.14) 1px, transparent 1px);
  background-size: 28px 28px; opacity: .35;
  mask-image: radial-gradient(70% 70% at 50% 50%, #000, transparent 85%);
  -webkit-mask-image: radial-gradient(70% 70% at 50% 50%, #000, transparent 85%);
}
.cover-icon { position: relative; z-index: 1; width: 58%; height: auto; }

/* 真實截圖封面：填滿 16:9、關掉格線 overlay */
.card__img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center top; z-index: 1; display: block; }
.cover--photo { background: var(--surface-2); }
.cover--photo::after { display: none; }

/* 封面淺/深版依主題切換（對應站點三態 theme）。單版封面用純 .card__img 不受影響 */
.card__img--dark { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .card__img--light { display: none; }
  :root:not([data-theme="light"]) .card__img--dark  { display: block; }
}
:root[data-theme="light"] .card__img--light { display: block; }
:root[data-theme="light"] .card__img--dark  { display: none; }
:root[data-theme="dark"]  .card__img--light { display: none; }
:root[data-theme="dark"]  .card__img--dark  { display: block; }

/* ZeroType cover：語音波形 */
.cover--zerotype { background: linear-gradient(135deg, #5b57f5 0%, #8b5cf6 45%, #12b5c9 100%); }
.cover--zerotype .wave rect { fill: rgba(255,255,255,.92); }
.cover--zerotype .wave rect:nth-child(odd) { fill: rgba(255,255,255,.7); }

/* AI Hub cover：節點網路 */
.cover--aihub { background: linear-gradient(135deg, #0ea5b7 0%, #4f46e5 55%, #6d28d9 100%); }
.cover--aihub .hub line { stroke: rgba(255,255,255,.5); stroke-width: 2; }
.cover--aihub .hub circle { fill: rgba(255,255,255,.9); }
.cover--aihub .hub__core { fill: #fff; }

/* Coming soon cover */
.cover--soon {
  background:
    repeating-linear-gradient(45deg, var(--surface-2) 0 14px, transparent 14px 28px),
    var(--surface);
}
.soon-glyph {
  position: relative; z-index: 1;
  font-family: var(--font-latin); font-weight: 700; font-size: 40px;
  color: var(--muted); opacity: .55; letter-spacing: -.02em;
}
.card--soon { border-style: dashed; box-shadow: none; }
.card--soon:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.card--soon .card__cover::after { opacity: .18; }

.card__body { display: flex; flex-direction: column; gap: 12px; padding: 20px 20px 22px; flex: 1; }
.card__meta { display: flex; flex-wrap: wrap; gap: 7px; }
.tag {
  font-size: 12.5px; font-weight: 500; letter-spacing: .01em;
  padding: 4px 10px; border-radius: 999px;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent);
}
.tag--muted {
  color: var(--text-2); background: var(--surface-2);
  border-color: var(--border);
}
.card__title { font-size: 21px; font-weight: 600; }
.card__desc { color: var(--text-2); font-size: 15px; line-height: 1.66; }

.card__foot {
  margin-top: auto; padding-top: 8px;
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  flex-wrap: wrap;
}
.status {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 13px; color: var(--text-2);
}
.status__dot { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); }
.status--warm .status__dot { background: var(--warm); box-shadow: 0 0 0 4px color-mix(in srgb, var(--warm) 22%, transparent); }
.status--core .status__dot { background: var(--core); box-shadow: 0 0 0 4px color-mix(in srgb, var(--core) 22%, transparent); }
.status--soon .status__dot { background: var(--muted); }

.card__link {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 14px; font-weight: 500; color: var(--accent);
  transition: gap .15s;
}
.card__link:hover { gap: 8px; }
.card__link--none { color: var(--muted); font-weight: 400; }

/* ---------- Concept ---------- */
.concept {
  display: grid; gap: 40px;
  grid-template-columns: 1.4fr 1fr; align-items: start;
}
.concept__text p { color: var(--text-2); font-size: 16.5px; margin-top: 18px; max-width: 54ch; }
.concept__text .section-title { margin-top: 6px; }

.brandmap {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow);
}
.brandmap__root { padding-bottom: 16px; border-bottom: 1px dashed var(--border); margin-bottom: 6px; }
.brandmap__name {
  display: block; font-family: var(--font-latin); font-weight: 700;
  font-size: 22px; letter-spacing: -.02em;
}
.brandmap__name::after { content: "."; color: var(--accent); }
.brandmap__role { font-size: 13px; color: var(--muted); }

.brandmap__list { display: flex; flex-direction: column; }
.brandmap__list li {
  position: relative; display: flex; align-items: baseline;
  justify-content: space-between; gap: 12px;
  padding: 13px 0 13px 22px; border-bottom: 1px solid var(--border-2);
}
.brandmap__list li:last-child { border-bottom: 0; }
.brandmap__list li::before {
  content: ""; position: absolute; left: 4px; top: 50%;
  width: 9px; height: 9px; margin-top: -4px; border-radius: 50%;
  background: var(--grad);
}
.brandmap__list li.is-soon::before { background: var(--muted); opacity: .5; }
.brandmap__node { font-weight: 600; font-size: 15.5px; }
.brandmap__note { font-size: 13px; color: var(--muted); text-align: right; }
.is-soon .brandmap__node { color: var(--text-2); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-2);
  padding-block: 40px 30px;
}
.footer-inner {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 24px; flex-wrap: wrap;
}
.footer__made { color: var(--muted); font-size: 14px; margin-top: 6px; }
.footer__links { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.footer__links a {
  font-size: 15px; color: var(--text-2);
  border-bottom: 1px solid transparent; padding-bottom: 2px;
  transition: color .15s, border-color .15s;
}
.footer__links a:hover { color: var(--accent); border-color: var(--accent); }
.footer-fine {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  margin-top: 26px; padding-top: 20px; border-top: 1px solid var(--border-2);
  font-size: 13px; color: var(--muted);
}
.footer-fine__sep { opacity: .5; }

/* ---------- Responsive ---------- */
@media (max-width: 820px) {
  .concept { grid-template-columns: 1fr; gap: 28px; }
}
@media (max-width: 620px) {
  .cards { grid-template-columns: 1fr; }
  .nav > a { padding: 8px 9px; }
  .footer-inner { align-items: flex-start; }
}