:root {
  --bg: #0b1417;
  --bg2: #0f1d21;
  --panel: #12252a;
  --line: #1f3d44;
  --line2: #2d5a63;
  --ink: #d5e6e4;
  --dim: #8aa7a8;
  --mute: #5d7e82;
  --amber: #e2b45a;
  --cyan: #62d0d6;
  --jade: #7bd6a4;
  --rose: #e58a8a;
  --serif: "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", "STSong", "SimSun", serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { background: var(--bg); }
body {
  margin: 0; color: var(--ink); font-family: var(--serif); line-height: 1.65;
  background:
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 48px 48px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 48px 48px,
    radial-gradient(1200px 600px at 75% -10%, #17383f 0%, transparent 60%), var(--bg);
  background-blend-mode: soft-light, soft-light, normal, normal;
}
a { color: var(--cyan); text-underline-offset: 3px; }
code, .mono { font-family: var(--mono); font-size: .88em; color: var(--cyan); }
h1, h2 { font-weight: 600; letter-spacing: .02em; margin: 0; }
.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px 24px; border-bottom: 1px solid var(--line2); background: color-mix(in srgb, var(--bg) 88%, transparent); position: sticky; top: 0; z-index: 5; backdrop-filter: blur(6px); }
.brand { display: flex; gap: 10px; align-items: center; color: var(--ink); text-decoration: none; }
.brand svg { color: var(--cyan); }
.brand b { display: block; font-size: 1.05rem; letter-spacing: .12em; }
.brand small { display: block; font-family: var(--mono); font-size: .62rem; letter-spacing: .22em; color: var(--mute); }
nav a { font-family: var(--mono); font-size: .8rem; margin-left: 18px; color: var(--dim); text-decoration: none; letter-spacing: .08em; }
nav a:hover { color: var(--cyan); }
main { max-width: 1160px; margin: 0 auto; padding: 0 20px 40px; }
.hero { display: grid; grid-template-columns: minmax(280px, 400px) 1fr; gap: 36px; padding: 40px 0 28px; align-items: start; }
.eyebrow { font-family: var(--mono); font-size: .72rem; letter-spacing: .2em; color: var(--amber); margin: 0 0 10px; }
h1 { font-size: clamp(1.9rem, 4.4vw, 2.7rem); line-height: 1.25; }
h1 em { font-style: normal; color: var(--cyan); border-bottom: 1px dashed var(--cyan); }
.lede { color: var(--dim); max-width: 36em; }
.lede strong { color: var(--ink); font-weight: 600; }
.panel { border: 1px solid var(--line2); background: linear-gradient(180deg, var(--panel), var(--bg2)); padding: 16px 16px 12px; margin-top: 20px; position: relative; }
.panel::before, .panel::after { content: ""; position: absolute; width: 10px; height: 10px; border: 1px solid var(--cyan); }
.panel::before { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.panel::after { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }
.panel-title { display: flex; justify-content: space-between; font-family: var(--mono); font-size: .72rem; color: var(--mute); letter-spacing: .18em; margin-bottom: 10px; border-bottom: 1px solid var(--line); padding-bottom: 6px; }
label { display: grid; gap: 4px; margin-bottom: 10px; font-size: .85rem; color: var(--dim); }
input, select, button { font: inherit; }
input[type=datetime-local], input[type=email], select { background: #0a1215; color: var(--ink); border: 1px solid var(--line2); padding: 8px 10px; font-family: var(--mono); font-size: .88rem; border-radius: 0; width: 100%; }
input:focus-visible, select:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }
.check { grid-template-columns: auto 1fr; align-items: start; gap: 8px; }
.check small { grid-column: 2; color: var(--mute); }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
button { cursor: pointer; padding: 9px 18px; border-radius: 0; font-family: var(--mono); letter-spacing: .12em; font-size: .85rem; }
.primary { background: var(--cyan); color: #04181b; border: 1px solid var(--cyan); font-weight: 700; }
.primary:hover { background: #8de3e8; }
.ghost { background: transparent; color: var(--cyan); border: 1px solid var(--line2); }
.ghost:hover { border-color: var(--cyan); }
.hint { font-size: .78rem; color: var(--mute); margin: 8px 0 0; }

/* instrument */
.instrument { min-width: 0; }
#board-wrap { position: relative; width: min(100%, 640px); margin: 0 auto; aspect-ratio: 1; padding: 4.5%; }
.dial { position: absolute; inset: 0; border: 1px solid var(--line2); border-radius: 50%; background: repeating-conic-gradient(from 0deg, var(--line2) 0 .4deg, transparent .4deg 7.5deg), radial-gradient(circle, transparent 68%, #0d2227 69%, transparent 70%); opacity: .55; pointer-events: none; mask: radial-gradient(circle, transparent 66%, #000 67%); -webkit-mask: radial-gradient(circle, transparent 66%, #000 67%); }
.board { position: relative; display: grid; grid-template-columns: repeat(3, 1fr); grid-template-rows: repeat(3, 1fr); gap: 0; width: 100%; height: 100%; border: 1px solid var(--cyan); background: rgba(8, 18, 21, .82); box-shadow: 0 0 0 6px rgba(98, 208, 214, .06), 0 0 40px rgba(98, 208, 214, .08); }
.cell { position: relative; border: 1px solid var(--line2); padding: 4px 6px; display: grid; grid-template-rows: auto 1fr auto auto; min-height: 0; font-size: clamp(.62rem, 1.9vw, .95rem); }
.cell .pn { font-family: var(--mono); font-size: .66em; color: var(--mute); display: flex; justify-content: space-between; }
.cell .spirit { color: var(--amber); text-align: center; letter-spacing: .1em; align-self: center; }
.cell .mid { display: flex; justify-content: space-between; align-items: baseline; gap: 4px; font-family: var(--mono); }
.cell .tian { color: #f0f6f5; font-weight: 700; font-size: 1.15em; }
.cell .star { color: var(--cyan); font-family: var(--serif); }
.cell .door { color: var(--jade); text-align: center; letter-spacing: .08em; }
.cell .di { font-family: var(--mono); color: var(--dim); text-align: right; border-top: 1px dashed var(--line2); margin-top: 2px; }
.cell.center { align-content: center; justify-items: center; text-align: center; color: var(--mute); background: radial-gradient(circle, #14323a, transparent 70%); }
.cell.center .ju { font-size: 1.9em; color: var(--ink); line-height: 1; font-family: var(--mono); }
.cell.center .dun { color: var(--amber); letter-spacing: .3em; }
.badges { position: absolute; right: 3px; bottom: 3px; display: flex; gap: 2px; }
.badges span, .b-fu, .b-shi, .b-kong, .b-ma, .b-hour { font-family: var(--mono); font-size: .62rem; line-height: 1; padding: 2px 3px; border: 1px solid; display: inline-block; }
.b-fu { color: var(--cyan); border-color: var(--cyan); } .b-shi { color: var(--jade); border-color: var(--jade); }
.b-kong { color: var(--rose); border-color: var(--rose); } .b-ma { color: var(--amber); border-color: var(--amber); } .b-hour { color: #fff; border-color: var(--dim); }
.cell.hl { background: rgba(98, 208, 214, .07); }
.legend { margin-top: 14px; font-size: .78rem; color: var(--dim); display: flex; flex-wrap: wrap; gap: 6px 12px; align-items: center; justify-content: center; }
.legend span[class^=k-] { padding-left: 8px; border-left: 3px solid; font-family: var(--mono); }
.k-spirit { border-color: var(--amber); } .k-tian { border-color: #f0f6f5; } .k-star { border-color: var(--cyan); } .k-door { border-color: var(--jade); } .k-di { border-color: var(--dim); }
.summary { display: grid; grid-template-columns: repeat(auto-fit, minmax(110px, 1fr)); gap: 1px; margin-top: 16px; background: var(--line2); border: 1px solid var(--line2); }
.summary div { background: var(--bg2); padding: 8px 10px; }
.summary dt, .summary small { font-family: var(--mono); font-size: .66rem; letter-spacing: .14em; color: var(--mute); display: block; }
.summary b { font-size: 1.05rem; font-weight: 600; }
.alert { border: 1px solid var(--amber); color: var(--amber); padding: 10px 14px; margin-bottom: 14px; background: rgba(226, 180, 90, .07); }
.alert.err { border-color: var(--rose); color: var(--rose); background: rgba(229, 138, 138, .07); }
.tabs { display: flex; gap: 8px; margin-bottom: 12px; }
.tabs button { flex: 1; background: transparent; color: var(--dim); border: 1px solid var(--line2); }
.tabs button[aria-selected=true] { border-color: var(--amber); color: var(--amber); background: rgba(226, 180, 90, .08); }
.confirm { margin-top: 14px; padding: 10px 14px; border: 1px dashed var(--amber); }
.confirm label { display: flex; gap: 8px; align-items: flex-start; color: var(--ink); margin: 0; }

/* sections */
section.audit, section.method, section.waitlist { padding: 28px 0; border-top: 1px solid var(--line2); }
h2 { font-size: 1.35rem; display: flex; align-items: baseline; gap: 12px; }
.sec { font-family: var(--mono); font-size: .75rem; color: var(--amber); letter-spacing: .2em; }
.sub { color: var(--dim); max-width: 46em; }
.steps { list-style: none; padding: 0; margin: 16px 0 0; display: grid; gap: 0; border-left: 1px solid var(--cyan); }
.steps li { display: grid; grid-template-columns: 7em 1fr auto; gap: 12px; padding: 7px 0 7px 16px; border-bottom: 1px solid var(--line); position: relative; align-items: baseline; }
.steps li::before { content: ""; position: absolute; left: -4px; top: 14px; width: 7px; height: 7px; background: var(--cyan); }
.steps .name { color: var(--dim); } .steps .val { font-size: 1.05rem; } .steps .rule { font-family: var(--mono); font-size: .72rem; color: var(--mute); text-align: right; }
.engine-line { font-family: var(--mono); font-size: .74rem; color: var(--mute); }
.params { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1px; background: var(--line2); border: 1px solid var(--line2); margin: 16px 0; }
.params div { background: var(--bg2); padding: 10px 14px; } .params dt { font-family: var(--mono); font-size: .68rem; letter-spacing: .16em; color: var(--mute); } .params dd { margin: 0; }
details.interim { border: 1px dashed var(--line2); padding: 8px 14px; color: var(--dim); } details.interim summary { cursor: pointer; color: var(--amber); }
.waitlist .panel { max-width: 460px; }
footer { border-top: 1px solid var(--line2); padding: 22px 24px 36px; max-width: 1160px; margin: 0 auto; color: var(--dim); }
.disclaimer { border-left: 3px solid var(--amber); padding-left: 12px; max-width: 48em; }
.fine { font-family: var(--mono); font-size: .72rem; color: var(--mute); }

@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; gap: 24px; padding-top: 24px; }
  .top { padding: 10px 14px; } nav a { margin-left: 10px; }
  .steps li { grid-template-columns: 5.5em 1fr; } .steps .rule { grid-column: 2; text-align: left; }
  #board-wrap { padding: 3%; }
}
@media (max-width: 420px) { .cell { padding: 2px 3px; } .cell .pn { display: none; } .badges { right: 1px; bottom: 1px; } }
@media (prefers-reduced-motion: no-preference) { .board { animation: settle .5s ease-out; } @keyframes settle { from { opacity: .3; transform: scale(.985); } } }