:root {
  color-scheme: dark;
  --bg: #100e18;
  --text: #fbf7ff;
  --muted: #c8bdd6;
  --accent: #e4bbff;
  --line: #392d48;
  font-family: system-ui, "Noto Sans Thai", "Noto Sans SC", sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; background: radial-gradient(ellipse at 78% 20%, #23163b 0, transparent 38rem), var(--bg); color: var(--text); }
a { color: inherit; }
:focus-visible { outline: 3px solid #edc6ff; outline-offset: 4px; }
.frame { width: min(1120px, calc(100% - 3rem)); margin-inline: auto; }
.site-header { display: flex; min-height: 84px; align-items: center; justify-content: space-between; gap: 1rem; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: .7rem; font-weight: 800; letter-spacing: .06em; text-decoration: none; }
.mark { display: grid; width: 2rem; height: 2rem; place-items: center; border: 1px solid #ae84d8; border-radius: .6rem; color: var(--accent); }
.accent { color: var(--accent); }
nav { display: flex; align-items: center; gap: 1.4rem; }
.nav-about { color: var(--muted); text-decoration: none; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: .6rem; min-height: 46px; padding: .65rem 1rem; border: 1px solid #8562ab; border-radius: .7rem; background: #231931; color: var(--text); font: inherit; font-weight: 700; text-decoration: none; cursor: pointer; }
.button:hover { background: #38264d; }
.button-primary { border-color: var(--accent); background: var(--accent); color: #21142c; }
.button-primary:hover { background: #f0d5ff; }
.hero { display: grid; grid-template-columns: 1.15fr 1fr; gap: clamp(1.7rem, 5vw, 5rem); align-items: center; padding-block: clamp(3.2rem, 8vw, 7.5rem); }
.eyebrow { color: var(--accent); font-size: .75rem; font-weight: 800; letter-spacing: .14em; }
.dot { display: inline-block; width: .52rem; height: .52rem; margin-right: .25rem; background: #d5a4fc; border-radius: 50%; box-shadow: 0 0 12px #c37cff; }
h1 { font-size: clamp(2.15rem, 5.4vw, 4.65rem); line-height: 1.18; letter-spacing: -.04em; margin: .7rem 0 1.15rem; }
.lede { max-width: 36rem; margin: 0 0 1.65rem; color: var(--muted); font-size: clamp(1rem, 1.8vw, 1.16rem); line-height: 1.8; }
.zh { margin: 1.3rem 0 0; color: var(--muted); font-size: .9rem; }
.signal-art { position: relative; display: grid; place-items: center; min-height: 300px; aspect-ratio: 1.2; border: 1px solid #53396f; border-radius: 1.3rem; overflow: hidden; background: radial-gradient(circle at 50% 50%, #37214f, #191322 74%); }
.wave { width: 100%; max-height: 100%; filter: drop-shadow(0 0 9px #c377f4); }
.art-label, .art-index { position: absolute; z-index: 1; left: 1.2rem; color: #ddc4ed; font: 650 .72rem ui-monospace, monospace; letter-spacing: .12em; }
.art-label { top: 1.2rem; }
.art-index { bottom: 1.2rem; }
.about { scroll-margin-top: 1rem; padding-block: 2rem 4.5rem; border-top: 1px solid var(--line); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.45rem); }
.services { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.services article { padding: 1.35rem; border: 1px solid var(--line); border-radius: 1rem; background: #181321; }
.services article span { color: var(--accent); font: 650 .74rem ui-monospace, monospace; letter-spacing: .05em; }
.services h3 { margin-block: .7rem .35rem; }
.services p { color: var(--muted); line-height: 1.65; margin: 0; }
.site-footer { display: flex; justify-content: space-between; gap: 1rem; padding-block: 1.25rem 2rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .86rem; }
.skip { position: absolute; top: .4rem; left: .4rem; padding: .6rem; transform: translateY(-150%); background: var(--bg); }
.skip:focus { transform: none; }
.login-panel { width: min(460px, calc(100% - 2.5rem)); margin: clamp(2rem, 8vh, 5rem) auto; padding: clamp(1.25rem, 5vw, 2.25rem); border: 1px solid #53396f; border-radius: 1.25rem; background: #191321; }
.login-panel h1 { font-size: clamp(1.65rem, 5vw, 2.15rem); }
.login-panel h1 span { color: var(--accent); font-size: .65em; }
.login-panel p, .back { color: var(--muted); }
.login-panel form { display: grid; gap: .55rem; margin-block: 1.4rem; }
.login-panel input { width: 100%; min-height: 46px; margin-bottom: .65rem; padding: .55rem .7rem; border: 1px solid #705784; border-radius: .5rem; background: #100e18; color: var(--text); font: inherit; }
.login-panel .login-error { margin: .2rem 0 0; color: #ffb8ca; }
.button:disabled { opacity: .65; cursor: wait; }
@media (max-width: 710px) {
  .frame { width: calc(100% - 2rem); }
  .hero, .services { grid-template-columns: 1fr; }
  .signal-art { min-height: 0; }
}
@media (max-width: 460px) {
  .nav-about { display: none; }
  .brand { font-size: .89rem; }
  .button-small { padding-inline: .7rem; }
}