/* Dana AI — общие стили: токены темы, кнопки, поля, карточки и лендинг */
:root {
  --bg: #f7f7fb; --surface: #ffffff; --surface-2: #f0f1f8; --line: #e3e5ef;
  --ink: #161a33; --ink-2: #4a5070; --ink-3: #7c829f;
  --brand: #0f766e; --brand-2: #0d9488; --brand-ink: #ffffff; --brand-soft: #d9f5f0;
  --accent: #ffb020; --mint: #12b886; --rose: #f0506e; --sky: #1c9cf0;
  --ok: #0f9d6a; --warn: #c27c00; --err: #d6334f;
  --radius: 16px; --radius-s: 10px; --shadow: 0 1px 2px rgba(22,26,51,.05), 0 8px 24px rgba(22,26,51,.06);
  --font: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif; --display: 'Unbounded', 'Inter', sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1020; --surface: #161a2e; --surface-2: #1d2238; --line: #2a3050;
    --ink: #eef0ff; --ink-2: #b4b9d6; --ink-3: #8389aa;
    --brand: #2dd4bf; --brand-2: #5eead4; --brand-ink: #06302c; --brand-soft: #123c38; --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0e1020; --surface: #161a2e; --surface-2: #1d2238; --line: #2a3050;
  --ink: #eef0ff; --ink-2: #b4b9d6; --ink-3: #8389aa;
  --brand: #2dd4bf; --brand-2: #5eead4; --brand-ink: #06302c; --brand-soft: #123c38; --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.55 var(--font); -webkit-font-smoothing: antialiased; }
a { color: var(--brand); text-decoration: none; }
h1, h2, h3 { font-family: var(--display); line-height: 1.2; margin: 0 0 .5em; letter-spacing: -.01em; }
h1 { font-size: clamp(30px, 5vw, 54px); font-weight: 700; }
h2 { font-size: clamp(24px, 3.4vw, 36px); font-weight: 600; }
h3 { font-size: 18px; font-weight: 600; }
p { margin: 0 0 1em; }
.muted { color: var(--ink-2); }
.small { font-size: 14px; }
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 20px; }
.hidden { display: none !important; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 1px solid transparent; border-radius: 12px; padding: 11px 18px;
  font: 600 15px/1.2 var(--font); cursor: pointer; background: var(--surface-2); color: var(--ink); transition: transform .08s, background .15s, box-shadow .15s; white-space: nowrap; }
.btn:hover { background: var(--line); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn.primary { background: var(--brand); color: var(--brand-ink); box-shadow: 0 6px 18px color-mix(in srgb, var(--brand) 35%, transparent); }
.btn.primary:hover { background: var(--brand-2); }
.btn.ghost { background: transparent; border-color: var(--line); }
.btn.ghost:hover { background: var(--surface-2); }
.btn.danger { background: transparent; color: var(--err); border-color: color-mix(in srgb, var(--err) 35%, transparent); }
.btn.lg { padding: 15px 24px; font-size: 16px; border-radius: 14px; }
.btn.sm { padding: 7px 12px; font-size: 13px; border-radius: 9px; }

input, select, textarea { width: 100%; font: 15px/1.4 var(--font); color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 11px; padding: 11px 13px; outline: none; transition: border-color .15s, box-shadow .15s; }
input:focus, select:focus, textarea:focus { border-color: var(--brand); box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 18%, transparent); }
textarea { resize: vertical; min-height: 84px; }
label { display: block; font-size: 14px; font-weight: 600; color: var(--ink-2); margin: 0 0 6px; }
.field { margin-bottom: 14px; }
.row { display: flex; gap: 12px; flex-wrap: wrap; }
.row > * { flex: 1 1 180px; }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.pill { display: inline-flex; align-items: center; gap: 6px; padding: 5px 11px; border-radius: 99px; font-size: 13px; font-weight: 600; background: var(--brand-soft); color: var(--brand); }
.error { color: var(--err); font-size: 14px; min-height: 1em; margin: 6px 0 0; }
.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); background: var(--ink); color: var(--bg); padding: 12px 18px; border-radius: 12px; font-weight: 600; z-index: 100; box-shadow: var(--shadow); max-width: calc(100% - 32px); }
.spinner { width: 18px; height: 18px; border-radius: 50%; border: 2.5px solid currentColor; border-right-color: transparent; animation: spin .7s linear infinite; display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Лендинг ---------- */
.top { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 85%, transparent); backdrop-filter: blur(12px); border-bottom: 1px solid color-mix(in srgb, var(--line) 60%, transparent); }
.top .wrap { display: flex; align-items: center; gap: 20px; height: 66px; }
.logo { display: flex; align-items: center; gap: 10px; font: 700 19px var(--display); color: var(--ink); }
.logo i { width: 34px; height: 34px; border-radius: 11px; display: grid; place-items: center; font-style: normal; color: #fff; font-size: 17px;
  background: conic-gradient(from 210deg, var(--brand), #a855f7, var(--accent), var(--brand)); }
.top nav { display: flex; gap: 22px; margin-left: 18px; }
.top nav a { color: var(--ink-2); font-weight: 500; font-size: 15px; }
.top nav a:hover { color: var(--ink); }
.top .sp { flex: 1; }
.langs { display: flex; background: var(--surface-2); border-radius: 10px; padding: 3px; }
.langs button { border: 0; background: transparent; color: var(--ink-2); font: 600 13px var(--font); padding: 6px 9px; border-radius: 8px; cursor: pointer; }
.langs button.on { background: var(--surface); color: var(--ink); box-shadow: var(--shadow); }

.hero { padding: 64px 0 40px; position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; inset: -200px -10% auto; height: 620px; z-index: -1;
  background: radial-gradient(40% 50% at 20% 30%, color-mix(in srgb, var(--brand) 22%, transparent), transparent 70%),
              radial-gradient(35% 45% at 85% 20%, color-mix(in srgb, var(--accent) 22%, transparent), transparent 70%); }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
.hero h1 em { font-style: normal; background: linear-gradient(90deg, var(--brand), #a855f7 55%, #e2537e); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .sub { font-size: 19px; color: var(--ink-2); max-width: 560px; }
.hero .ctas { display: flex; gap: 12px; flex-wrap: wrap; margin: 26px 0 18px; }
.hero .points { display: flex; gap: 18px; flex-wrap: wrap; color: var(--ink-2); font-size: 14px; }
.hero .points span::before { content: '✓ '; color: var(--mint); font-weight: 700; }

.mock { position: relative; }
.mock .card { padding: 18px; }
.mock .doc-head { display: flex; gap: 8px; align-items: center; margin-bottom: 12px; }
.mock .doc-head b { font-family: var(--display); font-size: 15px; }
.mock .bar { height: 10px; border-radius: 6px; background: var(--surface-2); margin: 8px 0; }
.mock table { width: 100%; border-collapse: collapse; font-size: 12px; }
.mock td, .mock th { border: 1px solid var(--line); padding: 6px 8px; text-align: left; vertical-align: top; }
.mock th { background: var(--surface-2); font-weight: 600; }
.mock .float { position: absolute; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); padding: 10px 14px; font-size: 13px; font-weight: 600; display: flex; gap: 8px; align-items: center; }
.mock .f1 { left: -26px; bottom: 34px; animation: bob 4s ease-in-out infinite; }
.mock .f2 { right: -14px; top: -18px; animation: bob 5s ease-in-out infinite reverse; }
@keyframes bob { 50% { transform: translateY(-8px); } }

.subjects { margin: 26px 0 0; overflow: hidden; mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.subjects .track { display: flex; gap: 10px; width: max-content; animation: marquee 50s linear infinite; }
.subjects span { padding: 8px 14px; border-radius: 99px; background: var(--surface); border: 1px solid var(--line); font-size: 14px; color: var(--ink-2); white-space: nowrap; }
@keyframes marquee { to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) { .subjects .track, .mock .float { animation: none; } }

section.block { padding: 72px 0; }
.head { text-align: center; max-width: 720px; margin: 0 auto 36px; }
.head p { color: var(--ink-2); font-size: 17px; }

.demo { display: grid; grid-template-columns: .9fr 1.1fr; gap: 28px; align-items: start; }
.demo form { display: grid; gap: 10px; }
.demo-out { min-height: 260px; }
.q-list { display: grid; gap: 12px; }
.q-item { border: 1px solid var(--line); border-radius: 12px; padding: 14px; background: var(--surface); }
.q-item b { display: block; margin-bottom: 8px; }
.q-item ol { margin: 0; padding-left: 22px; }
.q-item li.ok { color: var(--ok); font-weight: 600; }

.tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.tool { display: flex; gap: 14px; align-items: flex-start; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; transition: transform .15s, box-shadow .15s, border-color .15s; color: var(--ink); cursor: pointer; text-align: left; font: inherit; width: 100%; }
.tool:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--brand) 40%, var(--line)); }
.tool .ic { width: 44px; height: 44px; flex: 0 0 44px; border-radius: 12px; display: grid; place-items: center; font-size: 22px; background: var(--surface-2); }
.tool b { display: block; font-size: 16px; margin-bottom: 3px; }
.tool small { color: var(--ink-2); font-size: 13.5px; line-height: 1.45; display: block; }
.tool .cost { margin-top: 8px; font-size: 12px; font-weight: 600; color: var(--brand); }
.group-title { font: 600 13px var(--font); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-3); margin: 26px 0 10px; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; counter-reset: s; }
.steps .card { position: relative; padding-top: 54px; }
.steps .card::before { counter-increment: s; content: counter(s); position: absolute; top: 18px; left: 22px; width: 28px; height: 28px; border-radius: 9px; background: var(--brand); color: #fff; display: grid; place-items: center; font: 700 14px var(--display); }

.why { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.why .card b { display: block; font-size: 17px; margin-bottom: 6px; }
.why .card span { font-size: 26px; display: block; margin-bottom: 10px; }

.period { display: inline-flex; background: var(--surface-2); border-radius: 12px; padding: 4px; margin: 0 auto 26px; }
.period button { border: 0; background: transparent; padding: 9px 16px; border-radius: 9px; font: 600 14px var(--font); color: var(--ink-2); cursor: pointer; }
.period button.on { background: var(--surface); color: var(--ink); box-shadow: var(--shadow); }
.period em { font-style: normal; color: var(--mint); margin-left: 4px; }
.plans { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; align-items: stretch; }
.plan { display: flex; flex-direction: column; position: relative; }
.plan.hot { border: 2px solid var(--brand); }
.plan .tag { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--brand); color: #fff; font-size: 12px; font-weight: 700; padding: 4px 10px; border-radius: 99px; }
.plan h3 { font-size: 20px; margin-bottom: 2px; }
.plan .price { font: 700 32px var(--display); margin: 14px 0 2px; }
.plan .price small { font: 500 14px var(--font); color: var(--ink-2); }
.plan .tok { font-weight: 600; color: var(--brand); margin-bottom: 12px; }
.plan ul { list-style: none; padding: 0; margin: 0 0 18px; font-size: 14px; color: var(--ink-2); display: grid; gap: 6px; flex: 1; }
.plan ul li::before { content: '≈ '; color: var(--ink-3); }

.faq details { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 16px 20px; margin-bottom: 10px; }
.faq summary { font-weight: 600; cursor: pointer; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
.faq summary::after { content: '+'; color: var(--brand); font-size: 20px; line-height: 1; }
.faq details[open] summary::after { content: '–'; }
.faq details p { margin: 10px 0 0; color: var(--ink-2); }

.lead { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: center; }
.lead form { display: grid; gap: 10px; }
footer { padding: 34px 0 44px; color: var(--ink-3); font-size: 14px; border-top: 1px solid var(--line); }

/* Модальное окно входа */
.modal { position: fixed; inset: 0; background: rgba(10,12,28,.55); display: grid; place-items: center; z-index: 50; padding: 16px; }
.modal .card { width: 100%; max-width: 420px; max-height: calc(100vh - 32px); overflow: auto; }
.tabs { display: flex; gap: 6px; background: var(--surface-2); border-radius: 12px; padding: 4px; margin-bottom: 16px; }
.tabs button { flex: 1; border: 0; background: transparent; padding: 9px; border-radius: 9px; font: 600 14px var(--font); color: var(--ink-2); cursor: pointer; }
.tabs button.on { background: var(--surface); color: var(--ink); box-shadow: var(--shadow); }

@media (max-width: 960px) {
  .hero-grid, .demo, .lead { grid-template-columns: 1fr; }
  .plans { grid-template-columns: repeat(2, 1fr); }
  .why { grid-template-columns: repeat(2, 1fr); }
  .top nav { display: none; }
  .mock .f1 { left: 8px; } .mock .f2 { right: 8px; }
}
@media (max-width: 640px) {
  .wrap { padding: 0 16px; }
  .plans, .why, .steps { grid-template-columns: 1fr; }
  .hero { padding-top: 36px; }
  .hero h1 { font-size: 26px; overflow-wrap: break-word; }
  .hero .ctas .btn { flex: 1 1 100%; }
  .hero .sub { font-size: 17px; }
  .top .wrap { gap: 10px; }
  .top .btn.ghost { display: none; }
  .logo span { display: none; }
  section.block { padding: 52px 0; }
}