/* SPDX-License-Identifier: Apache-2.0
   antenna.contact — one stylesheet, no external resources.
   Tokens follow the desktop app (docs/DESIGN.md "Дизайн-система"). */

@font-face { font-family: "Plex Sans"; font-weight: 300; font-style: normal; font-display: swap;
  src: url("/assets/fonts/IBMPlexSans-Light.latin.woff2") format("woff2"); }
@font-face { font-family: "Plex Sans"; font-weight: 400; font-style: normal; font-display: swap;
  src: url("/assets/fonts/IBMPlexSans-Regular.latin.woff2") format("woff2"); }
@font-face { font-family: "Plex Sans"; font-weight: 600; font-style: normal; font-display: swap;
  src: url("/assets/fonts/IBMPlexSans-SemiBold.latin.woff2") format("woff2"); }
@font-face { font-family: "Plex Mono"; font-weight: 400; font-style: normal; font-display: swap;
  src: url("/assets/fonts/IBMPlexMono-Regular.latin.woff2") format("woff2"); }

:root {
  --bg0: #050A14; --bg1: #08111F; --bg2: #0C172A; --bg3: #112038; --hover: #14284A;
  --line: #182842; --line-strong: #24406A;
  --accent: #6CC6FF; --accent-strong: #3A9EF2; --accent-deep: #173F6E; --accent-ink: #041426;
  --text: #E3ECF8; --dim: #98ABC6; --mute: #5F7598;
  --ok: #5CD6A9; --warn: #E7B867; --danger: #FF6E7C;
  --t1: #7385A3; --t2: #7FA9DB; --t3: #6CC6FF; --t4: #4FDDD6; --t5: #E6F6FF;
  --r-s: 6px; --r-m: 10px; --r-l: 14px; --r-xl: 18px;
  --sans: "Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; background: var(--bg0); color: var(--text);
  font: 400 16px/1.6 var(--sans); font-feature-settings: "kern";
  background-image: radial-gradient(1200px 600px at 70% -10%, rgba(58, 158, 242, .10), transparent 60%),
                    radial-gradient(900px 500px at -10% 10%, rgba(23, 63, 110, .35), transparent 60%);
  background-repeat: no-repeat;
}
img { max-width: 100%; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: #9ad9ff; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
.mono, code { font-family: var(--mono); font-feature-settings: "tnum", "zero"; }
code { font-size: .92em; background: var(--bg2); border: 1px solid var(--line); border-radius: var(--r-s); padding: 1px 6px; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; }
h1 { font-weight: 300; font-size: clamp(2rem, 4.6vw, 3.4rem); letter-spacing: -.01em; }
h2 { font-weight: 300; font-size: clamp(1.6rem, 3vw, 2.3rem); }
h3 { font-weight: 600; font-size: 1.08rem; }
p { margin: 0 0 1em; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--bg3); padding: 8px 12px; border-radius: var(--r-s); z-index: 20; }
.skip:focus { left: 8px; }

.wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding-inline: 24px; }
.narrow { max-width: 760px; }
.section { padding-block: 72px; border-top: 1px solid rgba(24, 40, 66, .6); }
.eyebrow { color: var(--accent); font-size: .78rem; letter-spacing: .14em; text-transform: uppercase; margin-bottom: 14px; }
.lead { color: var(--dim); font-size: 1.14rem; max-width: 46em; }
.small, .note { color: var(--dim); font-size: .9rem; }

/* header */
.top { position: sticky; top: 0; z-index: 10; background: rgba(5, 10, 20, .82); border-bottom: 1px solid var(--line); }
@supports (backdrop-filter: blur(8px)) { .top { backdrop-filter: blur(10px); background: rgba(5, 10, 20, .66); } }
.top-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 300; font-size: 1.35rem; letter-spacing: .01em; }
.brand:hover { color: var(--text); }
.brand img { display: block; filter: drop-shadow(0 0 8px rgba(108, 198, 255, .25)); }
.nav { display: flex; align-items: center; gap: 22px; }
.nav a:not(.btn) { color: var(--dim); text-decoration: none; font-size: .95rem; }
.nav a:not(.btn):hover { color: var(--text); }
@media (max-width: 760px) { .nav a:not(.btn) { display: none; } }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 0 20px;
  border-radius: var(--r-m); border: 1px solid var(--accent-strong); background: var(--accent); color: var(--accent-ink);
  font: 600 .98rem/1 var(--sans); text-decoration: none; cursor: pointer;
  box-shadow: 0 0 0 1px rgba(108, 198, 255, .15), 0 6px 24px rgba(58, 158, 242, .22); transition: background .15s, box-shadow .15s; }
.btn:hover { background: #8fd4ff; color: var(--accent-ink); box-shadow: 0 0 0 1px rgba(108, 198, 255, .3), 0 8px 30px rgba(58, 158, 242, .32); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--line-strong); box-shadow: none; }
.btn-ghost:hover { background: var(--hover); color: var(--text); box-shadow: 0 0 18px rgba(108, 198, 255, .12); }
.btn-small { min-height: 36px; padding: 0 14px; font-size: .9rem; }
.btn[disabled] { opacity: .6; cursor: progress; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 0; }

/* hero */
.hero { position: relative; padding: 96px 0 210px; overflow: hidden; }
.hero::after { content: ""; position: absolute; inset: auto 0 0 0; height: 300px; pointer-events: none;
  background: url("/assets/ridges.svg") center bottom / cover no-repeat; opacity: .9; }
.hero .wrap { position: relative; z-index: 1; }
.hero h1 { max-width: 17em; }
.facts { display: flex; flex-wrap: wrap; gap: 10px; list-style: none; padding: 0; margin: 36px 0 0; }
.facts li { font-size: .8rem; color: var(--dim); border: 1px solid var(--line-strong); border-radius: 999px; padding: 6px 12px; background: rgba(12, 23, 42, .6); }

/* cards */
.grid { display: grid; gap: 18px; margin-top: 28px; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 900px) { .g3 { grid-template-columns: 1fr; } }
@media (max-width: 760px) { .g2 { grid-template-columns: 1fr; } }
.card { background: linear-gradient(180deg, rgba(17, 32, 56, .72), rgba(8, 17, 31, .72)); border: 1px solid var(--line);
  border-radius: var(--r-l); padding: 24px; box-shadow: 0 0 0 1px rgba(108, 198, 255, .03), 0 10px 30px rgba(0, 0, 0, .25); }
.card p:last-child, .card ul:last-child, .card ol:last-child { margin-bottom: 0; }
.card p, .card li { color: var(--dim); }
.card.wide { grid-column: 1 / -1; }
.tag { color: var(--accent); font-size: .75rem; letter-spacing: .1em; text-transform: uppercase; margin-bottom: 10px; }

.levels { list-style: none; padding: 0; margin: 0 0 14px; display: grid; gap: 8px; }
.levels li { display: flex; align-items: baseline; gap: 10px; }
.levels b { color: var(--text); font-weight: 600; }
.lv { flex: none; display: inline-grid; place-items: center; width: 24px; height: 24px; border-radius: 7px; font-size: .8rem;
  border: 1px solid currentColor; transform: translateY(1px); }
.lv1 { color: var(--t1); } .lv2 { color: var(--t2); } .lv3 { color: var(--t3); box-shadow: 0 0 8px rgba(108, 198, 255, .25); }
.lv4 { color: var(--t4); box-shadow: 0 0 10px rgba(79, 221, 214, .3); } .lv5 { color: var(--t5); box-shadow: 0 0 14px rgba(230, 246, 255, .35); }

.ticks, .todo, .notes { padding: 0; margin: 0 0 14px; list-style: none; display: grid; gap: 8px; }
.ticks li, .todo li, .notes li { position: relative; padding-left: 22px; }
.ticks li::before { content: ""; position: absolute; left: 2px; top: .55em; width: 9px; height: 5px; border: solid var(--ok); border-width: 0 0 2px 2px; transform: rotate(-45deg); }
.todo li::before { content: ""; position: absolute; left: 2px; top: .5em; width: 8px; height: 8px; border: 1.5px solid var(--warn); border-radius: 50%; }
.notes li::before { content: ""; position: absolute; left: 4px; top: .7em; width: 5px; height: 5px; background: var(--accent); border-radius: 50%; }
.warn { color: var(--warn) !important; border: 1px solid rgba(231, 184, 103, .35); background: rgba(231, 184, 103, .06); border-radius: var(--r-m); padding: 10px 14px; font-size: .95rem; }

/* invite */
.invite { padding: 40px 0 8px; }
.invite-card { border-color: var(--line-strong); box-shadow: 0 0 0 1px rgba(108, 198, 255, .08), 0 0 40px rgba(58, 158, 242, .14); }
.invite-card h1 { font-size: clamp(1.7rem, 3.6vw, 2.5rem); }
.invite-card .notes { margin-top: 18px; font-size: .95rem; }
.invite-card .field { margin-top: 22px; }
.invite-card .field .label { font-weight: 400; font-size: .75rem; color: var(--dim); letter-spacing: .1em; text-transform: uppercase; }
.invite-card textarea { field-sizing: content; }
#invite-title:focus { outline: none; }
@media (max-width: 600px) { .invite-card { padding: 18px; } .invite-card textarea { min-height: 8.5em; } .lead { font-size: 1.04rem; } }

/* form */
.beta { padding-bottom: 96px; }
.form { margin-top: 24px; display: grid; gap: 20px; }
.field { display: grid; gap: 8px; border: 0; padding: 0; margin: 0; min-width: 0; }
.label { font-weight: 600; font-size: .95rem; color: var(--text); padding: 0; }
.label em { font-style: normal; font-weight: 400; color: var(--mute); font-size: .85rem; margin-left: 6px; }
input[type=email], input[type=text], textarea {
  width: 100%; font: 400 1rem/1.5 var(--sans); color: var(--text); background: var(--bg1);
  border: 1px solid var(--line-strong); border-radius: var(--r-m); padding: 10px 12px; }
textarea { resize: vertical; min-height: 96px; }
textarea.mono { font-family: var(--mono); font-size: .85rem; min-height: 0; word-break: break-all; }
input:focus, textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(108, 198, 255, .18); }
::placeholder { color: var(--mute); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips label { display: inline-flex; align-items: center; gap: 8px; border: 1px solid var(--line-strong); border-radius: 999px;
  padding: 6px 12px; color: var(--dim); cursor: pointer; font-size: .95rem; background: var(--bg1); }
.chips label:has(input:checked) { border-color: var(--accent); color: var(--text); background: rgba(23, 63, 110, .45); }
input[type=checkbox] { accent-color: var(--accent); width: 16px; height: 16px; margin: 0; }
.check { display: flex; gap: 12px; align-items: flex-start; color: var(--dim); font-size: .95rem; cursor: pointer; }
.check input { margin-top: 4px; flex: none; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.form .btn { justify-self: start; }
.status { min-height: 1.5em; margin: 0; font-size: .98rem; }
.status.ok { color: var(--ok); }
.status.err { color: var(--danger); }

/* document pages */
.doc h1 { margin-bottom: .4em; }
.doc h2 { font-size: 1.35rem; font-weight: 600; margin-top: 1.8em; }
.doc p, .doc li { color: var(--dim); }
.doc ul { padding-left: 1.2em; }

/* footer */
.foot { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--dim); font-size: .92rem; }
.foot-row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 28px; }
.foot-row p { margin: 0; }
.foot-row .mono { margin-left: auto; color: var(--mute); }
.small-brand { font-size: 1.05rem; gap: 8px; }
@media (max-width: 600px) { .foot-row .mono { margin-left: 0; } .hero { padding: 64px 0 180px; } .section { padding-block: 56px; } }