/* raidio.lol pre-teaser (RAI-33): self-contained. A tuning dial behind frosted glass, one card on top. */
/* ---------- theme ---------- */
:root{--bg:#f6f7f9;--raised:#fff;--line:#dde1e8;--text:#1d2330;--muted:#677085;--accent:#3b6cf6;--accent-hover:#2f5be0;--on-accent:#fff;--red:#e5322d;--shadow-lg:0 12px 32px rgba(20,23,28,.14);--font:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color-scheme:light}
@media (prefers-color-scheme:dark){:root:not([data-theme]){--bg:#12151b;--raised:#20262f;--line:#2a303c;--text:#e6e9ef;--muted:#8b93a7;--accent:#6d93ff;--accent-hover:#89a8ff;--on-accent:#0b1430;--shadow-lg:0 12px 32px rgba(0,0,0,.6);color-scheme:dark}}
:root[data-theme="dark"]{--bg:#12151b;--raised:#20262f;--line:#2a303c;--text:#e6e9ef;--muted:#8b93a7;--accent:#6d93ff;--accent-hover:#89a8ff;--on-accent:#0b1430;--shadow-lg:0 12px 32px rgba(0,0,0,.6);color-scheme:dark}
:root[data-black]{--bg:#000;--raised:#0b0b0d;--line:#222;--shadow-lg:0 12px 32px #000}
*{box-sizing:border-box}
body.pre{margin:0;min-height:100dvh;background:var(--bg);color:var(--text);font-family:var(--font);line-height:1.5}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.hp{position:absolute;inset-inline-start:-9999px;width:1px;height:1px;opacity:0}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}

/* ---------- dial ---------- */
.dial{position:fixed;inset:0;z-index:0;overflow:hidden;pointer-events:none;color:var(--muted)}
.static{position:absolute;inset:0;width:100%;height:100%;image-rendering:pixelated;opacity:0;mix-blend-mode:multiply}
:root[data-theme="dark"] .static,:root[data-black] .static{mix-blend-mode:screen}
@media (prefers-color-scheme:dark){:root:not([data-theme]) .static{mix-blend-mode:screen}}
.dial-band{position:absolute;left:0;right:0;top:clamp(36px,9vh,90px);height:clamp(70px,13vh,120px);border-block:2px solid color-mix(in srgb,var(--muted) 50%,transparent);background:color-mix(in srgb,var(--raised) 60%,transparent)}
.dial-ticks{position:absolute;inset:0;opacity:.55;
  background:repeating-linear-gradient(90deg,currentColor 0 2px,transparent 2px 5%) 0 0/100% 45% no-repeat,
  repeating-linear-gradient(90deg,currentColor 0 1px,transparent 1px 1%) 0 0/100% 25% no-repeat}
.dial-labels{position:absolute;inset:0}
.dial-labels span{position:absolute;bottom:8px;transform:translateX(-50%);font-size:clamp(11px,1.6vmin,16px);letter-spacing:.04em;white-space:nowrap;opacity:.6}
.dial-labels span small{display:block;font-size:.8em;opacity:.7;text-align:center}
.dial-labels span.me{opacity:1;color:var(--text);font-weight:700}
.needle{position:absolute;top:0;bottom:0;left:0;width:0;will-change:transform}
.needle-line{position:absolute;top:0;bottom:0;left:-1px;width:3px;background:var(--red);box-shadow:0 0 12px var(--red);opacity:.75}
.lamp{position:absolute;top:clamp(8px,3vh,28px);left:0;transform:translateX(-50%);z-index:1;padding:2px 10px;border-radius:6px;border:2px solid color-mix(in srgb,var(--red) 40%,transparent);color:color-mix(in srgb,var(--red) 45%,transparent);background:var(--bg);font-size:12px;font-weight:800;letter-spacing:.14em;white-space:nowrap;transition:all .4s}
.lamp.on{background:var(--red);border-color:var(--red);color:#fff;box-shadow:0 0 22px 4px var(--red)}
.dial-now{position:absolute;top:calc(clamp(36px,9vh,90px) + clamp(70px,13vh,120px) + 16px);left:0;margin:0;max-width:min(34ch,80vw);padding:6px 12px;border-radius:10px;font-size:clamp(14px,2vmin,18px);font-weight:600;color:var(--text);background:color-mix(in srgb,var(--raised) 80%,transparent);opacity:0;transition:opacity .5s}
.dial-now.on{opacity:1}

/* ---------- glass ---------- */
.pre-sheet{position:fixed;inset:0;z-index:1;pointer-events:none;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);
  background:repeating-linear-gradient(45deg,rgba(127,127,127,.035) 0 1px,transparent 1px 5px),linear-gradient(color-mix(in srgb,var(--bg) 25%,transparent),color-mix(in srgb,var(--bg) 40%,transparent))}

/* ---------- card ---------- */
.pre-page{position:relative;z-index:2;min-height:100dvh;display:grid;grid-template-rows:1fr auto}
.pre-main{display:flex;align-items:center;justify-content:center;padding:max(24px,env(safe-area-inset-top)) max(16px,env(safe-area-inset-right)) 24px max(16px,env(safe-area-inset-left))}
.pre-card{width:100%;max-width:32rem;text-align:center;padding:28px 28px 26px;border-radius:20px;border:1px solid var(--line);background:color-mix(in srgb,var(--raised) 90%,transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:var(--shadow-lg)}
.pre-logo{display:flex;align-items:center;justify-content:center;gap:10px}
.logo-mark{font-size:2rem;line-height:1;letter-spacing:.05em}
.pre-more{margin:10px 0 0;font-size:13px;opacity:.65;letter-spacing:.04em}
.wordmark{font-size:2rem;font-weight:800;letter-spacing:-.02em}.wordmark span{color:var(--accent)}
.pre-card h1{font-size:clamp(1.6rem,6vw,2.3rem);line-height:1.2;margin:14px 0 20px;text-wrap:balance}
.pre-input{width:100%;min-height:48px;padding:8px 14px;margin-bottom:12px;border-radius:12px;border:2px solid var(--line);background:var(--bg);color:var(--text);font:inherit;font-size:17px}
.btn{display:flex;align-items:center;justify-content:center;width:100%;min-height:56px;padding:8px 20px;border-radius:12px;background:var(--accent);color:var(--on-accent);border:2px solid var(--accent);font:inherit;font-size:18px;font-weight:600;cursor:pointer}
.btn:hover{background:var(--accent-hover)}.btn:disabled{opacity:.6;cursor:wait}
.signup-msg{min-height:1.5em;margin:10px 0 0;font-size:15px;color:var(--text)}.signup-msg.ok{font-weight:700}
.pre-line{margin:8px auto 0;max-width:28rem;font-size:16px;text-wrap:pretty}

/* ---------- bar ---------- */
.pre-bar{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:4px 14px;margin:0 auto calc(12px + env(safe-area-inset-bottom));padding:6px 14px;max-width:calc(100% - 32px);border-radius:18px;background:color-mix(in srgb,var(--bg) 88%,transparent)}
.toggle{width:44px;height:44px;border-radius:50%;border:1px solid var(--line);background:var(--raised);color:var(--text);font-size:18px;cursor:pointer}
.pre-lang{height:44px;max-width:11rem;padding:0 12px;border-radius:22px;border:1px solid var(--line);background:var(--raised);color:var(--text);font:inherit;font-size:14px;cursor:pointer}
.pre-foot{font-size:14px;text-align:center;text-wrap:balance}
@media (max-width:559px){.dial-band{top:52px;height:64px}.dial-now{top:124px}.pre-card{padding:22px 18px 20px}.wordmark{font-size:1.7rem}.logo-mark{font-size:1.5rem}.pre-foot{font-size:13px}.pre-lang{height:40px;max-width:9rem;font-size:13px}.pre-line{font-size:15px}}
@media (max-height:620px){.pre-card{padding:16px 22px}.pre-card h1{margin:8px 0 12px}.logo-mark{font-size:1.5rem}}
@media (prefers-reduced-motion:reduce){.lamp,.dial-now{transition:none}}