/* ============================================================
   MolStudio — landing page styles
   Dark scientific theme · responsive · no build step
   ============================================================ */

:root {
  --bg: #070b14;
  --bg-2: #0b1220;
  --bg-3: #111a2e;
  --panel: rgba(20, 30, 51, 0.72);
  --panel-solid: #121b2f;
  --border: rgba(120, 160, 220, 0.16);
  --border-strong: rgba(120, 160, 220, 0.32);
  --text: #e8eef8;
  --text-dim: #9fb0c9;
  --text-faint: #8a9cb8;
  --accent: #4d9ef7;
  --accent-2: #34e5c4;
  --accent-3: #a06bff;
  --accent-grad: linear-gradient(120deg, #4d9ef7 0%, #34e5c4 100%);
  --accent-grad-2: linear-gradient(120deg, #a06bff 0%, #4d9ef7 100%);
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 20px 50px -18px rgba(0, 0, 0, 0.75);
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 3px;
  border-radius: 8px;
}

img { max-width: 100%; display: block; }

.container {
  width: min(1180px, 92vw);
  margin: 0 auto;
}

/* animated aurora background ------------------------------- */
.bg-aurora {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(60vw 60vw at 12% -8%, rgba(77, 158, 247, 0.20), transparent 60%),
    radial-gradient(50vw 50vw at 92% 4%, rgba(160, 107, 255, 0.16), transparent 58%),
    radial-gradient(55vw 55vw at 60% 100%, rgba(52, 229, 196, 0.12), transparent 60%),
    var(--bg);
}
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(120, 160, 220, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 160, 220, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at 50% 20%, #000 0%, transparent 78%);
  -webkit-mask-image: radial-gradient(circle at 50% 20%, #000 0%, transparent 78%);
}

/* header ---------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(7, 11, 20, 0.72);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.nav-right { display: flex; align-items: center; gap: 18px; }
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  letter-spacing: 0.3px;
}
.brand picture,
.footer-brand picture { display: block; line-height: 0; }
.brand img {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  box-shadow: 0 0 0 1px var(--border-strong), 0 6px 18px -6px rgba(77, 158, 247, 0.7);
}
.brand .name { font-size: 1.12rem; }
.brand .tag {
  font-size: 0.68rem;
  color: var(--text-faint);
  font-weight: 500;
  border-left: 1px solid var(--border-strong);
  padding-left: 12px;
  margin-left: 2px;
  letter-spacing: 0.6px;
  text-transform: uppercase;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 0.92rem;
  color: var(--text-dim);
}
.nav-links a { transition: color 0.2s; }
.nav-links a:hover { color: var(--text); }
.nav-cta {
  padding: 9px 18px;
  border-radius: 999px;
  background: var(--accent-grad);
  color: #041018 !important;
  font-weight: 700;
  font-size: 0.88rem;
  box-shadow: 0 10px 24px -10px rgba(77, 158, 247, 0.9);
  transition: transform 0.2s, box-shadow 0.2s;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 14px 30px -10px rgba(77, 158, 247, 1); }
.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-dim);
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.4px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.lang-toggle:hover { color: var(--text); border-color: var(--accent); background: rgba(77, 158, 247, 0.1); }
.lang-toggle .globe { font-size: 0.95rem; }
.nav-toggle { display: none; background: none; border: 0; color: var(--text); font-size: 1.5rem; cursor: pointer; }

/* hero ------------------------------------------------------ */
.hero {
  position: relative;
  padding: 90px 0 70px;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.9rem);
  line-height: 1.08;
  letter-spacing: -1.2px;
  font-weight: 800;
  margin-bottom: 22px;
}
.hero h1 .grad {
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero .lead {
  font-size: 1.08rem;
  color: var(--text-dim);
  max-width: 560px;
  margin-bottom: 34px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 38px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  border-radius: 12px;
  font-weight: 700;
  font-size: 0.96rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.18s, box-shadow 0.18s, background 0.18s, border-color 0.18s;
}
.btn-primary {
  background: var(--accent-grad);
  color: #041018;
  box-shadow: 0 16px 34px -14px rgba(77, 158, 247, 0.95);
}
.btn-primary:hover { transform: translateY(-2px); }
.btn-ghost {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--border-strong);
  color: var(--text);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.07); transform: translateY(-2px); }

.hero-stats {
  display: flex;
  gap: 34px;
  flex-wrap: wrap;
}
.stat .num {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat .lbl { font-size: 0.8rem; color: var(--text-faint); letter-spacing: 0.4px; }

/* hero preview (frameless) --------------------------------- */
.hero-visual { position: relative; }
.hero-media {
  /* No window chrome: the screenshots sit directly on the page.  The radius
     is kept so the media edges stay soft, and overflow clips the slides. */
  border-radius: var(--radius);
  overflow: hidden;
}
.hero-media picture { display: block; }
.hero-media img { width: 100%; height: auto; display: block; }

/* hero carousel ---------------------------------------------- */
.carousel { position: relative; background: #0b1220; }
.carousel-viewport { overflow: hidden; }
.carousel-track {
  display: flex;
  transition: transform 0.55s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
}
.carousel-slide { flex: 0 0 100%; margin: 0; position: relative; }
.carousel-slide picture,
.carousel-slide img { display: block; width: 100%; height: auto; }
.carousel-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 36px 18px 15px;
  font-size: 0.82rem;
  color: var(--text);
  background: linear-gradient(transparent, rgba(4, 8, 16, 0.88));
  pointer-events: none;
}
.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: rgba(8, 14, 26, 0.74);
  color: var(--text);
  font-size: 1.35rem;
  line-height: 1;
  cursor: pointer;
  backdrop-filter: blur(8px);
  opacity: 0.85;
  transition: opacity 0.25s ease, background 0.25s ease;
}
.carousel-btn:hover,
.carousel-btn:focus-visible { opacity: 1; background: rgba(22, 36, 60, 0.94); }
.carousel-btn.prev { left: 12px; }
.carousel-btn.next { right: 12px; }
.carousel-dots {
  position: absolute;
  right: 16px;
  bottom: 15px;
  display: flex;
  gap: 7px;
}
.carousel-dot {
  width: 9px;
  height: 9px;
  padding: 0;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.2);
  cursor: pointer;
  transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}
.carousel-dot.is-active {
  background: var(--accent-2);
  border-color: var(--accent-2);
  transform: scale(1.15);
}
/* pause control (WCAG 2.2.2): autoplay can always be stopped by the visitor */
.carousel-pause {
  position: absolute;
  right: 66px;
  bottom: 7px;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  padding: 0;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: rgba(8, 14, 26, 0.74);
  color: var(--text);
  font-size: 0.62rem;
  line-height: 1;
  cursor: pointer;
  backdrop-filter: blur(8px);
  opacity: 0.85;
  transition: opacity 0.25s ease, background 0.25s ease;
}
.carousel-pause:hover,
.carousel-pause:focus-visible { opacity: 1; background: rgba(22, 36, 60, 0.94); }
.carousel.is-single .carousel-pause,
.carousel.no-autoplay .carousel-pause { display: none; }
/* 只有一帧时不显示控件（缺图自动跳过后的降级态） */
.carousel.is-single .carousel-btn,
.carousel.is-single .carousel-dots { display: none; }

/* section scaffolding --------------------------------------- */
section { padding: 82px 0; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 54px; }
.section-head .kicker {
  font-size: 0.78rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
}
.section-head h2 {
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.8px;
  margin: 12px 0 14px;
}
.section-head p { color: var(--text-dim); font-size: 1rem; }

/* feature grid ---------------------------------------------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.card {
  position: relative;
  padding: 28px 26px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--border);
  transition: transform 0.22s, border-color 0.22s, background 0.22s;
  overflow: hidden;
}
.card::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--accent-grad);
  opacity: 0;
  transition: opacity 0.25s;
}
.card:hover { transform: translateY(-5px); border-color: var(--border-strong); background: var(--bg-3); }
.card:hover::after { opacity: 1; }
.card .ico {
  width: 46px; height: 46px;
  border-radius: 12px;
  display: grid; place-items: center;
  font-size: 1.35rem;
  margin-bottom: 18px;
  background: rgba(77, 158, 247, 0.12);
  border: 1px solid var(--border-strong);
}
.card h3 { font-size: 1.08rem; margin-bottom: 9px; font-weight: 700; }
.card p { color: var(--text-dim); font-size: 0.92rem; }

/* applications hub ------------------------------------------ */
.apps-wrap {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}
.app-group {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--panel);
  padding: 24px 22px;
}
.app-group h3 {
  display: flex; align-items: center; gap: 10px;
  font-size: 0.82rem; text-transform: uppercase; letter-spacing: 1.2px;
  color: var(--text-faint); font-weight: 700; margin-bottom: 16px;
}
.app-group h3 .tag {
  width: 8px; height: 8px; border-radius: 2px; background: var(--accent);
}
.app-group:nth-child(2) h3 .tag { background: var(--accent-2); }
.app-group:nth-child(3) h3 .tag { background: var(--accent-3); }
.app-group:nth-child(4) h3 .tag { background: #febc2e; }
.app-group ul { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.app-group li { display: flex; gap: 12px; font-size: 0.92rem; }
.app-group li .k { font-weight: 700; color: var(--text); min-width: 96px; }
.app-group li .v { color: var(--text-dim); font-size: 0.86rem; }

/* download -------------------------------------------------- */
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 22px;
}
.dl-card {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--panel);
  padding: 30px 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: transform 0.22s, border-color 0.22s;
}
.dl-card:hover { transform: translateY(-5px); border-color: var(--border-strong); }
.dl-card .row { display: flex; align-items: center; gap: 14px; }
.dl-card .row .ic {
  width: 50px; height: 50px; border-radius: 13px; display: grid; place-items: center;
  font-size: 1.4rem; background: rgba(77, 158, 247, 0.12); border: 1px solid var(--border-strong);
}
.dl-card .row .ic img { width: 34px; height: 34px; border-radius: 8px; }
.dl-card h3 { font-size: 1.1rem; }
.dl-card .meta { color: var(--text-faint); font-size: 0.82rem; }
.dl-card p { color: var(--text-dim); font-size: 0.9rem; flex: 1; }
.dl-card .btn { justify-content: center; }

/* inline command / filename hints inside the requirements-style panels */
.req-list div code {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
  padding: 1px 6px;
  border-radius: 5px;
  white-space: nowrap;
}

/* download not yet published */
.dl-card.is-coming .btn-primary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-faint);
  box-shadow: none;
  pointer-events: none;
  cursor: not-allowed;
}
.dl-card.is-coming .meta { color: var(--accent-2); }

.req-box {
  margin-top: 28px;
  border-radius: var(--radius);
  border: 1px dashed var(--border-strong);
  background: rgba(77, 158, 247, 0.04);
  padding: 26px 28px;
}
.req-box h4 { font-size: 0.82rem; text-transform: uppercase; letter-spacing: 1.4px; color: var(--accent); margin-bottom: 16px; }
.req-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; }
.req-list div { font-size: 0.9rem; color: var(--text-dim); }
.req-list div b { color: var(--text); display: block; margin-bottom: 2px; }

/* pricing --------------------------------------------------- */
.pricing-grid {
  display: grid;
  /* three cards: Free / Personal Commercial / Bundle.  At 1080px each card
     keeps a readable ~340px instead of stretching across a wide screen. */
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  align-items: stretch;
  max-width: 1080px;
  margin: 0 auto;
}
.price-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 30px 26px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--panel);
  transition: transform 0.22s, border-color 0.22s;
}
.price-card:hover { transform: translateY(-5px); border-color: var(--border-strong); }
.price-card.featured {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(77, 158, 247, 0.1), rgba(20, 30, 51, 0.72));
  box-shadow: 0 22px 52px -24px rgba(77, 158, 247, 0.8);
}
.price-badge {
  position: absolute;
  top: -12px;
  right: 20px;
  padding: 4px 13px;
  border-radius: 999px;
  background: var(--accent-grad);
  color: #041018;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.5px;
}
.price-card h3 { font-size: 1.02rem; }
.price-tier-sub { color: var(--text-faint); font-size: 0.82rem; margin-top: -6px; }
.price-amount {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.1;
  margin: 4px 0 2px;
}
.price-amount .per { font-size: 0.78rem; font-weight: 500; color: var(--text-faint); letter-spacing: 0; }
.price-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
  margin: 6px 0 4px;
}
.price-card li { position: relative; padding-left: 24px; font-size: 0.88rem; color: var(--text-dim); }
.price-card li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent-2);
  font-weight: 800;
}
.price-card .btn { justify-content: center; margin-top: auto; }
.pricing-note { margin-top: 30px; text-align: center; }
.pricing-note p { color: var(--text-dim); font-size: 0.9rem; }
.pricing-note p .fine,
.pricing-note p.fine { color: var(--text-faint); font-size: 0.82rem; margin-top: 6px; }

/* bundle card ------------------------------------------------ */
.price-badge.alt {
  background: rgba(77, 158, 247, 0.18);
  border: 1px solid rgba(77, 158, 247, 0.45);
  color: var(--accent);
}
.bundle-card { border-color: rgba(77, 158, 247, 0.45); }

/* footer ---------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 48px 0 34px;
  margin-top: 40px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 30px;
  flex-wrap: wrap;
}
.footer-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.footer-brand img { width: 32px; height: 32px; border-radius: 8px; }
.footer-brand b { font-size: 1.02rem; }
.footer-note { color: var(--text-faint); font-size: 0.86rem; max-width: 420px; }
.footer-links { display: flex; gap: 44px; flex-wrap: wrap; }
.footer-col h3 { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 1.2px; color: var(--text-faint); margin: 0 0 14px; }
.footer-col a { display: block; color: var(--text-dim); font-size: 0.9rem; margin-bottom: 9px; transition: color 0.2s; }
.footer-col a:hover { color: var(--text); }
.copyright {
  margin-top: 36px; padding-top: 22px; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  color: var(--text-faint); font-size: 0.82rem;
}

/* legal pages (refund / terms / privacy) -------------------- */
/* Pair two language blocks; i18n.js sets <html lang> to "zh-CN" or "en". */
.i18n-en { display: none; }
html[lang="en"] .i18n-en { display: block; }
html[lang="en"] .i18n-zh { display: none; }

.legal-page { padding: 118px 0 70px; }
.legal { max-width: 860px; }
.legal-back { display: inline-block; color: var(--text-dim); font-size: 0.88rem; margin-bottom: 22px; }
.legal-back:hover { color: var(--text); }
.legal h1 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); line-height: 1.2; margin-bottom: 10px; }
.legal h2 { font-size: 1.12rem; margin: 30px 0 10px; color: var(--text); }
.legal p, .legal li { color: var(--text-dim); font-size: 0.95rem; }
.legal p { margin-bottom: 12px; }
.legal ul { margin: 0 0 12px 22px; }
.legal li { margin-bottom: 7px; }
.legal .legal-meta { color: var(--text-faint); font-size: 0.82rem; margin-bottom: 26px; }

/* ============================================================
   AIDDHub product hub (index.html) + coming-soon page
   ============================================================ */
.brand .mark,
.footer-brand .mark {
  width: 34px; height: 34px; border-radius: 9px;
  display: grid; place-items: center;
  background: var(--accent-grad); color: #041018;
  font-weight: 800; font-size: 1rem; line-height: 1;
  flex: 0 0 auto;
}
.footer-brand .mark { width: 32px; height: 32px; }

/* centred single-column hero (hub home + placeholder pages) */
.hero.is-center { grid-template-columns: 1fr; padding: 118px 0 34px; text-align: center; }
.hero.is-center .hero-copy { max-width: 780px; margin: 0 auto; }
.hero.is-center .lead { margin-left: auto; margin-right: auto; }
.hero.is-center .hero-actions { justify-content: center; }
.hero.is-center .hero-stats { justify-content: center; }

.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 10px; border-radius: 999px;
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.4px;
  vertical-align: middle; white-space: nowrap;
  border: 1px solid var(--border-strong); color: var(--text-dim);
}
.chip-live { color: var(--accent-2); border-color: rgba(52, 229, 196, 0.4); background: rgba(52, 229, 196, 0.08); }


/* reveal on scroll ------------------------------------------ */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* responsive ------------------------------------------------ */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 56px; gap: 44px; }
  .brand .tag { display: none; }
  .nav-links { display: none; position: absolute; top: 68px; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: rgba(7, 11, 20, 0.97); border-bottom: 1px solid var(--border); padding: 12px 4vw 20px; }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 0; width: 100%; }
  .nav-cta { margin-top: 10px; }
  .nav-toggle { display: block; }
  section { padding: 62px 0; }
}

/* respect reduced-motion ------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .reveal { opacity: 1 !important; transform: none !important; }
}