:root {
  --bg: #0a0a14;
  --bg-2: #11102a;
  --ink: #eef0ff;
  --muted: #a6a8c8;
  --accent: #8b7bff;
  --accent-2: #57e0d4;
  --line: rgba(255, 255, 255, 0.08);
  --glass: rgba(255, 255, 255, 0.045);
  --glass-strong: rgba(255, 255, 255, 0.07);
  --radius: 18px;
  --maxw: 1140px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Noto Sans TC", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang TC", "Microsoft JhengHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.wrap { width: min(var(--maxw), 92vw); margin: 0 auto; }
.wrap.narrow { width: min(760px, 92vw); }

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

/* Aurora background */
.bg-aurora {
  position: fixed;
  inset: -20% -20% auto -20%;
  height: 80vh;
  background:
    radial-gradient(50% 50% at 20% 20%, rgba(139, 123, 255, 0.35), transparent 60%),
    radial-gradient(45% 45% at 80% 10%, rgba(87, 224, 212, 0.25), transparent 60%),
    radial-gradient(40% 40% at 60% 40%, rgba(255, 120, 200, 0.18), transparent 60%);
  filter: blur(40px);
  z-index: -1;
  animation: float 18s ease-in-out infinite alternate;
}
@keyframes float {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to { transform: translate3d(0, 30px, 0) scale(1.05); }
}

/* Glass */
.glass {
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 10, 20, 0.6);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  gap: 16px;
}
.brand {
  font-weight: 900;
  font-size: 1.25rem;
  letter-spacing: 0.3px;
}
.brand-mark { color: var(--accent); margin-right: 4px; }
.brand-accent { color: var(--accent); }
.nav-links {
  display: flex;
  gap: 26px;
  font-size: 0.95rem;
  color: var(--muted);
}
.nav-links a:hover { color: var(--ink); }
.nav-cta { padding: 8px 16px; }

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.98rem;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease;
  border: 1px solid transparent;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0a0a14;
  box-shadow: 0 10px 30px rgba(139, 123, 255, 0.35);
}
.btn-ghost {
  background: var(--glass-strong);
  border-color: var(--line);
  color: var(--ink);
}
.btn-lg { padding: 16px 34px; font-size: 1.05rem; }

/* Hero */
.hero { padding: 72px 0 60px; }
.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}
.pill {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--accent-2);
  border: 1px solid rgba(87, 224, 212, 0.4);
  background: rgba(87, 224, 212, 0.08);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  line-height: 1.15;
  margin: 0 0 18px;
  font-weight: 900;
}
.grad {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lede { color: var(--muted); font-size: 1.08rem; margin: 0 0 28px; max-width: 30em; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 26px; }
.trust {
  list-style: none;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  padding: 0;
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

/* Hero chat card */
.hero-card { padding: 22px; min-height: 320px; display: flex; flex-direction: column; justify-content: flex-end; }
.chat { display: flex; flex-direction: column; gap: 12px; }
.chat-row { display: flex; }
.chat-row.me { justify-content: flex-end; }
.bubble {
  max-width: 80%;
  padding: 12px 16px;
  border-radius: 16px;
  font-size: 0.95rem;
  line-height: 1.5;
}
.bot .bubble { background: var(--glass-strong); border: 1px solid var(--line); border-bottom-left-radius: 4px; }
.me .bubble { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #0a0a14; font-weight: 500; border-bottom-right-radius: 4px; }
.chat-typing { display: flex; gap: 6px; padding: 14px 4px 0; }
.chat-typing span {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--muted); opacity: 0.6;
  animation: blink 1.2s infinite ease-in-out;
}
.chat-typing span:nth-child(2) { animation-delay: 0.2s; }
.chat-typing span:nth-child(3) { animation-delay: 0.4s; }
@keyframes blink { 0%, 80%, 100% { opacity: 0.25; transform: scale(0.8); } 40% { opacity: 1; transform: scale(1); } }

/* Sections */
.section { padding: 72px 0; }
.section.alt { background: linear-gradient(180deg, rgba(255,255,255,0.02), transparent); }
.section-title { font-size: clamp(1.8rem, 3.5vw, 2.4rem); text-align: center; margin: 0 0 10px; font-weight: 900; }
.section-sub { text-align: center; color: var(--muted); margin: 0 0 44px; }

/* Grids */
.grid { display: grid; gap: 22px; }
.features { grid-template-columns: repeat(3, 1fr); }
.steps { grid-template-columns: repeat(3, 1fr); text-align: center; }
.plans { grid-template-columns: repeat(2, 1fr); max-width: 720px; margin: 0 auto; }

/* Cards */
.card { padding: 26px; transition: transform 0.2s ease, border-color 0.2s ease; }
.card:hover { transform: translateY(-4px); border-color: rgba(139,123,255,0.4); }
.card .ico { font-size: 1.8rem; margin-bottom: 12px; }
.card h3 { margin: 0 0 8px; font-size: 1.15rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.98rem; }

/* Steps */
.step { padding: 10px; }
.step-num {
  width: 46px; height: 46px; margin: 0 auto 16px;
  display: grid; place-items: center;
  border-radius: 50%;
  font-weight: 900; font-size: 1.2rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0a0a14;
}
.step h3 { margin: 0 0 8px; }
.step p { color: var(--muted); margin: 0; }

/* Plans */
.plan { padding: 30px; position: relative; display: flex; flex-direction: column; }
.plan.prime { border-color: rgba(139,123,255,0.5); box-shadow: 0 12px 40px rgba(139,123,255,0.18); }
.plan-badge {
  position: absolute; top: -12px; right: 22px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0a0a14; font-size: 0.8rem; font-weight: 700;
  padding: 5px 12px; border-radius: 999px;
}
.plan h3 { margin: 0 0 6px; font-size: 1.3rem; }
.price { font-size: 2.4rem; font-weight: 900; margin: 0 0 18px; }
.price span { font-size: 1rem; font-weight: 500; color: var(--muted); }
.check { list-style: none; padding: 0; margin: 0 0 22px; flex: 1; }
.check li { padding: 8px 0; font-size: 0.98rem; }
.check .yes { color: var(--ink); }
.check .no { color: #6b6d86; }
.plan .btn { text-align: center; }

/* FAQ */
.faq { display: flex; flex-direction: column; gap: 12px; }
.faq details {
  background: var(--glass); border: 1px solid var(--line);
  border-radius: 14px; padding: 4px 18px;
}
.faq summary { cursor: pointer; padding: 16px 0; font-weight: 700; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--accent); font-weight: 900; }
.faq details[open] summary::after { content: "−"; }
.faq p { margin: 0 0 16px; color: var(--muted); }

/* CTA */
.cta { padding: 30px 0 80px; }
.cta-inner { padding: 50px 30px; text-align: center; }
.cta-inner h2 { margin: 0 0 10px; font-size: clamp(1.6rem, 3vw, 2.2rem); }
.cta-inner p { color: var(--muted); margin: 0 0 24px; }
.cta-inner .fine { margin: 14px 0 0; font-size: 0.85rem; opacity: 0.7; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 30px 0; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.copy { color: var(--muted); font-size: 0.9rem; margin: 0; }

/* Sub-page additions */
.breadcrumb { font-size: 0.85rem; color: var(--muted); margin: 86px 0 0; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--ink); }
.breadcrumb span { opacity: 0.6; }
.subhero { padding: 16px 0 50px; }
.subhero h1 { font-size: clamp(2rem, 4.5vw, 3rem); font-weight: 900; line-height: 1.15; margin: 8px 0 14px; }
.subhero .lede { color: var(--muted); max-width: 34em; font-size: 1.05rem; margin: 0; }
.callout {
  padding: 22px 26px; margin: 24px 0;
  border-left: 3px solid var(--accent);
  background: var(--glass); border-radius: 12px; color: var(--muted);
}
.callout strong { color: var(--ink); }
.related { padding: 64px 0 20px; }
.related h2 { text-align: center; font-size: 1.5rem; margin: 0 0 26px; }
.kw-pill {
  display: inline-block; font-size: 0.82rem; color: var(--accent-2);
  border: 1px solid rgba(87,224,212,0.4); background: rgba(87,224,212,0.08);
  padding: 5px 13px; border-radius: 999px; margin: 0 8px 12px 0;
}
.subnav { display: flex; flex-wrap: wrap; gap: 10px; padding: 0 0 8px; }

/* Responsive */
@media (max-width: 880px) {
  .hero-inner { grid-template-columns: 1fr; gap: 32px; }
  .features { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; }
  .nav-links { display: none; }
}
@media (max-width: 560px) {
  .features { grid-template-columns: 1fr; }
  .plans { grid-template-columns: 1fr; }
  .trust { gap: 12px; }
}