/* AlexSoftClub - общая дизайн-система сайта (главная, модули, статьи, документация) */

:root {
  --bg: #eaf1fa;
  --bg-soft: #f4f8fd;
  --card: #ffffff;
  --card-2: #f2f7fc;
  --card-3: #e6f0fa;
  --line: #dbe6f2;
  --line-strong: #c4d6ea;
  --text: #0f172a;
  --text-2: #475569;
  --muted: #64748b;
  --blue: #0088cc;
  --blue-2: #1aa3e8;
  --blue-deep: #00639a;
  --blue-soft: #d9ecfa;
  --blue-ink: #ffffff;
  --blue-solid: #0077b3;
  --blue-solid-2: #0a86c8;
  --green: #15803d;
  --green-soft: #dcfce7;
  --amber: #b45309;
  --amber-soft: #fef3c7;
  --red: #dc2626;
  --red-soft: #fee2e2;
  --violet: #6d28d9;
  --violet-soft: #ede9fe;

  --shadow-sm: 0 2px 8px rgba(15, 23, 42, .06);
  --shadow-md: 0 10px 24px rgba(15, 23, 42, .08);
  --shadow-lg: 0 18px 40px rgba(15, 23, 42, .12);
  --shadow-xl: 0 24px 56px rgba(15, 23, 42, .16);
  --shadow-cta: 0 12px 28px -12px rgba(0, 136, 204, .55);
  --shadow-cta-strong: 0 20px 44px -16px rgba(0, 136, 204, .6);

  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-xl: 28px;
  --r-pill: 999px;

  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
  --ease: cubic-bezier(.22, 1, .36, 1);
  --ease-spring: cubic-bezier(.34, 1.4, .5, 1);
  --container: 1180px;
  --header-h: 76px;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #0e1621;
  --bg-soft: #111c28;
  --card: #17212b;
  --card-2: #1d2a37;
  --card-3: #223243;
  --line: rgba(255, 255, 255, .07);
  --line-strong: rgba(255, 255, 255, .13);
  --text: #eaf0f6;
  --text-2: #aab8c6;
  --muted: #8395a7;
  --blue: #2aabee;
  --blue-2: #47b9f2;
  --blue-deep: #7cc9f5;
  --blue-soft: rgba(42, 171, 238, .14);
  --blue-ink: #ffffff;
  --blue-solid: #1673ad;
  --blue-solid-2: #1a80c0;
  --green: #4ade80;
  --green-soft: rgba(74, 222, 128, .13);
  --amber: #fbbf24;
  --amber-soft: rgba(251, 191, 36, .13);
  --red: #f87171;
  --red-soft: rgba(248, 113, 113, .13);
  --violet: #a78bfa;
  --violet-soft: rgba(167, 139, 250, .14);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, .3);
  --shadow-md: 0 10px 24px rgba(0, 0, 0, .35);
  --shadow-lg: 0 18px 40px rgba(0, 0, 0, .42);
  --shadow-xl: 0 24px 56px rgba(0, 0, 0, .5);
  --shadow-cta: 0 12px 28px -12px rgba(42, 171, 238, .5);
  --shadow-cta-strong: 0 20px 44px -16px rgba(42, 171, 238, .55);
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1621;
    --bg-soft: #111c28;
    --card: #17212b;
    --card-2: #1d2a37;
    --card-3: #223243;
    --line: rgba(255, 255, 255, .07);
    --line-strong: rgba(255, 255, 255, .13);
    --text: #eaf0f6;
    --text-2: #aab8c6;
    --muted: #8395a7;
    --blue: #2aabee;
    --blue-2: #47b9f2;
    --blue-deep: #7cc9f5;
    --blue-soft: rgba(42, 171, 238, .14);
    --blue-solid: #1673ad;
    --blue-solid-2: #1a80c0;
    --green: #4ade80;
    --green-soft: rgba(74, 222, 128, .13);
    --amber: #fbbf24;
    --amber-soft: rgba(251, 191, 36, .13);
    --red: #f87171;
    --red-soft: rgba(248, 113, 113, .13);
    --violet: #a78bfa;
    --violet-soft: rgba(167, 139, 250, .14);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, .3);
    --shadow-md: 0 10px 24px rgba(0, 0, 0, .35);
    --shadow-lg: 0 18px 40px rgba(0, 0, 0, .42);
    --shadow-xl: 0 24px 56px rgba(0, 0, 0, .5);
    --shadow-cta: 0 12px 28px -12px rgba(42, 171, 238, .5);
    --shadow-cta-strong: 0 20px 44px -16px rgba(42, 171, 238, .55);
    color-scheme: dark;
  }
}

/* ---------- База ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-2);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "cv11", "ss01";
  overflow-x: hidden;
}
img, svg, video { max-width: 100%; display: block; }
a { color: var(--blue); text-decoration: none; text-underline-offset: 3px; }
a:hover { color: var(--blue-deep); }
h1, h2, h3, h4 { color: var(--text); margin: 0; font-weight: 700; letter-spacing: -.02em; line-height: 1.15; text-wrap: balance; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; }
button { font: inherit; color: inherit; }
::selection { background: color-mix(in srgb, var(--blue) 24%, transparent); color: var(--text); }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; border-radius: 6px; }
html { scrollbar-color: var(--line-strong) transparent; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 10px; border: 2px solid var(--bg); }
::-webkit-scrollbar-track { background: transparent; }
.tnum { font-variant-numeric: tabular-nums; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.icon { width: 20px; height: 20px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* Мягкое голубое свечение фона */
.glow { position: relative; isolation: isolate; }
.glow::before {
  content: ""; position: absolute; z-index: -1; pointer-events: none;
  inset: -120px 0 auto 0; height: 760px;
  background:
    radial-gradient(520px 380px at 12% 18%, color-mix(in srgb, var(--blue) 14%, transparent), transparent 70%),
    radial-gradient(640px 420px at 82% 8%, color-mix(in srgb, var(--blue-2) 12%, transparent), transparent 70%);
}

/* ---------- Кнопки ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 52px; padding: 0 26px; border-radius: var(--r-md);
  font-weight: 700; font-size: 16px; letter-spacing: -.01em; line-height: 1;
  border: 1px solid transparent; cursor: pointer; white-space: nowrap;
  transition: transform .18s var(--ease), box-shadow .25s var(--ease), background-color .18s, color .18s, border-color .18s;
}
.btn .icon { width: 18px; height: 18px; }
.btn-primary {
  color: #fff;
  background: linear-gradient(180deg, var(--blue-solid-2), var(--blue-solid));
  box-shadow: var(--shadow-cta);
}
.btn-primary:hover { color: #fff; transform: translateY(-1px); box-shadow: var(--shadow-cta-strong); }
.btn-primary:active { transform: translateY(0); }
.btn-primary .btn-arrow {
  display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%;
  background: rgba(255, 255, 255, .22); margin-right: -8px; transition: transform .25s var(--ease);
}
.btn-primary:hover .btn-arrow { transform: translateX(3px); }
.btn-ghost { color: var(--text); background: var(--card); border-color: var(--line); box-shadow: var(--shadow-sm); }
.btn-ghost:hover { color: var(--text); border-color: var(--line-strong); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-ghost .icon { color: var(--blue); }
.btn-outline { color: var(--blue); background: transparent; border-color: color-mix(in srgb, var(--blue) 35%, transparent); }
.btn-outline:hover { color: var(--blue); background: var(--blue-soft); }
.btn-sm { min-height: 42px; padding: 0 18px; font-size: 15px; border-radius: 12px; }
.btn-block { width: 100%; }

/* ---------- Шапка ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50; height: var(--header-h);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(16px); -webkit-backdrop-filter: saturate(1.4) blur(16px);
  border-bottom: 1px solid transparent; transition: border-color .2s, box-shadow .2s;
}
.site-header.is-scrolled { border-bottom-color: var(--line); box-shadow: 0 6px 24px -18px rgba(15, 23, 42, .25); }
.header-inner { height: var(--header-h); display: flex; align-items: center; gap: 24px; }
.logo { display: inline-flex; align-items: center; gap: 10px; color: var(--text); font-weight: 800; font-size: 19px; letter-spacing: -.02em; }
.logo:hover { color: var(--text); }
.logo-mark {
  display: grid; place-items: center; width: 36px; height: 36px; border-radius: 11px;
  background: linear-gradient(160deg, #0a86c8, #005f92); color: #fff;
  font-size: 12px; font-weight: 800; letter-spacing: .02em; box-shadow: var(--shadow-cta);
}
:root[data-theme="dark"] .logo-mark { background: linear-gradient(160deg, #1a80c0, #0b5f94); }
.nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav a {
  color: var(--text-2); font-weight: 500; font-size: 15px; padding: 8px 12px; border-radius: 10px; white-space: nowrap;
  transition: color .15s, background-color .15s;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--text); background: color-mix(in srgb, var(--card) 70%, transparent); }
.header-actions { display: flex; align-items: center; gap: 10px; }
.icon-btn {
  display: grid; place-items: center; width: 42px; height: 42px; border-radius: 50%;
  background: var(--card); border: 1px solid var(--line); color: var(--text); cursor: pointer;
  transition: border-color .15s, transform .15s;
}
.icon-btn:hover { border-color: var(--line-strong); transform: translateY(-1px); }
.icon-btn .icon { width: 19px; height: 19px; }
.theme-toggle .i-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .i-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .i-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .i-sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .i-moon { display: none; }
}
.menu-toggle { display: none; }
.mobile-nav { display: none; }

@media (max-width: 1240px) { .nav a { padding: 8px 9px; font-size: 14.5px; } }
@media (max-width: 1140px) {
  .nav { display: none; }
  .header-actions { margin-left: auto; }
  .menu-toggle { display: grid; }
  .mobile-nav {
    position: fixed; inset: var(--header-h) 0 auto 0; z-index: 49;
    background: var(--bg); border-bottom: 1px solid var(--line); box-shadow: var(--shadow-lg);
    padding: 12px 20px 24px; flex-direction: column; gap: 2px;
  }
  .mobile-nav.is-open { display: flex; }
  .mobile-nav a { color: var(--text); font-weight: 600; font-size: 17px; padding: 12px 6px; border-bottom: 1px solid var(--line); }
  .mobile-nav .btn { margin-top: 14px; color: #fff; border: 0; }
}
@media (max-width: 560px) {
  .header-cta { display: none; }
  .container { padding: 0 16px; }
}

/* ---------- Секции ---------- */
.section { padding: 92px 0; }
.section-tight { padding: 70px 0; }
.section-head { max-width: 760px; margin-bottom: 44px; }
.section-head h2 { font-size: clamp(2rem, 4.4vw, 3.4rem); font-weight: 800; letter-spacing: -.025em; line-height: 1.05; }
.section-head p { margin-top: 16px; font-size: 18px; line-height: 1.55; color: var(--text-2); max-width: 620px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head.center p { margin-left: auto; margin-right: auto; }
.section-head-row { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; flex-wrap: wrap; margin-bottom: 44px; }
.section-head-row .section-head { margin-bottom: 0; }
@media (max-width: 720px) { .section { padding: 76px 0; } .section-head { margin-bottom: 32px; } .section-head p { font-size: 16.5px; } }

/* ---------- Поверхности ---------- */
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--r-lg); }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--r-xl); box-shadow: var(--shadow-lg); }
.chip {
  display: inline-flex; align-items: center; gap: 8px; min-height: 40px; padding: 0 16px;
  border-radius: var(--r-pill); border: 1px solid var(--line); background: var(--card);
  color: var(--text-2); font-size: 15px; font-weight: 500; cursor: pointer; white-space: nowrap;
  transition: color .15s, background-color .15s, border-color .15s, box-shadow .2s;
}
.chip:hover { color: var(--text); border-color: var(--line-strong); }
.chip[aria-pressed="true"], .chip[aria-selected="true"] { color: #fff; background: var(--blue-solid); border-color: var(--blue-solid); box-shadow: var(--shadow-cta); }
.chip .count { font-size: 12px; opacity: .7; }
.tag {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px; border-radius: var(--r-pill);
  background: var(--blue-soft); color: var(--blue-deep); font-size: 13.5px; font-weight: 600; line-height: 1.3;
  border: 1px solid color-mix(in srgb, var(--blue) 18%, transparent);
}
:root[data-theme="dark"] .tag { color: var(--blue-2); }
.dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; flex: none; }
.badge { display: inline-flex; align-items: center; padding: 3px 10px; border-radius: var(--r-pill); font-size: 12.5px; font-weight: 700; }
.badge-green { background: var(--green-soft); color: var(--green); }
.badge-blue { background: var(--blue-soft); color: var(--blue); }
.badge-amber { background: var(--amber-soft); color: var(--amber); }
.badge-red { background: var(--red-soft); color: var(--red); }

/* Окно-рамка для скриншотов и макетов */
.window { background: var(--card); border: 1px solid var(--line); border-radius: var(--r-lg); box-shadow: var(--shadow-xl); overflow: hidden; }
.window-bar { display: flex; align-items: center; gap: 8px; height: 40px; padding: 0 14px; border-bottom: 1px solid var(--line); background: var(--card-2); }
.window-bar i { width: 11px; height: 11px; border-radius: 50%; background: var(--line-strong); }
.window-bar i:nth-child(1) { background: #ff5f57; }
.window-bar i:nth-child(2) { background: #febc2e; }
.window-bar i:nth-child(3) { background: #28c840; }
.window-title {
  margin: 0 auto; padding: 4px 14px; border-radius: 8px; background: var(--card); border: 1px solid var(--line);
  font-family: var(--mono); font-size: 12px; color: var(--muted); max-width: 60%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

/* ---------- Финальный призыв ---------- */
.final-cta {
  position: relative; overflow: hidden; border-radius: var(--r-xl); padding: 64px 56px;
  background: linear-gradient(135deg, #0a7fc0 0%, #006aa3 55%, #005282 100%); color: #fff;
  box-shadow: var(--shadow-xl);
}
.final-cta::after {
  content: ""; position: absolute; right: -120px; top: -160px; width: 520px; height: 520px; border-radius: 50%;
  background: radial-gradient(closest-side, rgba(255, 255, 255, .22), transparent); pointer-events: none;
}
.final-cta h2 { color: #fff; font-size: clamp(2rem, 4vw, 3.1rem); font-weight: 800; letter-spacing: -.025em; line-height: 1.05; max-width: 720px; }
.final-cta p { margin-top: 16px; font-size: 18px; color: rgba(255, 255, 255, .86); max-width: 600px; }
.final-cta-actions { position: relative; z-index: 1; display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.final-cta .btn-white { background: #fff; color: #00639a; box-shadow: 0 14px 30px -14px rgba(0, 0, 0, .45); }
.final-cta .btn-white:hover { color: #00639a; transform: translateY(-1px); }
.final-cta .btn-line { color: #fff; border-color: rgba(255, 255, 255, .45); background: rgba(255, 255, 255, .08); }
.final-cta .btn-line:hover { color: #fff; background: rgba(255, 255, 255, .16); }
.final-cta-chat { display: grid; grid-template-columns: minmax(0, 1fr) 380px; column-gap: 48px; align-items: center; }
.cta-chat { position: relative; z-index: 1; border-radius: var(--r-lg); background: #0e1621; box-shadow: 0 24px 50px -18px rgba(0, 0, 0, .55); overflow: hidden; }
.cta-chat-head { display: flex; align-items: center; gap: 10px; padding: 12px 14px; background: #17212b; color: #fff; }
.cta-chat-head strong { display: block; font-size: 14.5px; }
.cta-chat-head small { display: block; font-size: 12px; color: #7f91a4; }
.cta-chat-head .ch-av { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 50%; background: linear-gradient(160deg, #0a86c8, #005f92); font-size: 11px; font-weight: 800; }
.cta-chat-body { display: grid; gap: 8px; padding: 16px 14px 10px; }
.final-cta .bubble { max-width: 88%; margin: 0; padding: 8px 12px 6px; border-radius: 14px; font-size: 14px; line-height: 1.45; color: #eaf0f6; }
.bubble time { display: block; text-align: right; font-size: 11px; color: rgba(234, 240, 246, .55); margin-top: 2px; }
.bubble.out { justify-self: end; background: #2b5278; border-bottom-right-radius: 4px; }
.bubble.in { justify-self: start; background: #182533; border-bottom-left-radius: 4px; }
.final-cta .cta-chat-note { margin: 0; padding: 0 14px 12px; font-size: 11.5px; color: #7f91a4; text-align: center; }
@media (max-width: 960px) { .final-cta-chat { grid-template-columns: 1fr; } .cta-chat { margin-top: 28px; } }
@media (max-width: 720px) { .final-cta { padding: 44px 24px; } .final-cta-actions .btn { width: 100%; } }

/* ---------- Подвал ---------- */
.site-footer { padding: 72px 0 40px; border-top: 1px solid var(--line); background: var(--bg-soft); }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 40px; }
.footer-brand p { margin-top: 16px; font-size: 15px; max-width: 320px; color: var(--muted); }
.footer-col h3 { font-size: 14px; font-weight: 700; color: var(--text); margin-bottom: 14px; letter-spacing: 0; }
.footer-col ul { list-style: none; display: grid; gap: 10px; }
.footer-col a { color: var(--text-2); font-size: 15px; }
.footer-col a:hover { color: var(--blue); }
.footer-socials { display: flex; gap: 10px; margin-top: 20px; }
.footer-bottom { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--line); font-size: 14px; color: var(--muted); }
@media (max-width: 860px) { .footer-grid { grid-template-columns: 1fr 1fr; } .footer-brand { grid-column: 1 / -1; } }

/* Плавающая кнопка Telegram */
.fab {
  position: fixed; right: 22px; bottom: 22px; z-index: 40; display: grid; place-items: center;
  width: 56px; height: 56px; border-radius: 50%; color: #fff;
  background: linear-gradient(180deg, var(--blue-solid-2), var(--blue-solid)); box-shadow: var(--shadow-cta-strong);
  transition: transform .2s var(--ease-spring);
}
.fab:hover { color: #fff; transform: scale(1.06); }
.fab .icon { width: 26px; height: 26px; }

/* ---------- Появление при прокрутке ---------- */
.reveal { transition: opacity .7s var(--ease), transform .7s var(--ease), filter .7s var(--ease); }
.js .reveal:not(.is-in) { opacity: 0; transform: translateY(18px); filter: blur(4px); }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .js .reveal:not(.is-in) { opacity: 1; transform: none; filter: none; }
}