:root {
  color-scheme: light dark;


  --bg-base: #f1f2f6;
  --text:   #16171c;
  --text-2: #565863;
  --text-3: #8f919c;

  --accent:      #2f62e9;
  --accent-deep: #2653cc;
  --accent-text: #2f62e9;
  --on-accent:   #ffffff;

  --fill-1: rgba(120, 122, 135, 0.08);
  --fill-2: rgba(120, 122, 135, 0.14);


  --veil: rgba(255, 255, 255, 0.48);
  --veil-strong: rgba(255, 255, 255, 0.66);
  --glass-blur: 16px;
  --glass-sat: 165%;
  --glass-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.12),
    inset 1.8px 3px 0px -2px rgba(255, 255, 255, 0.90),
    inset -2px -2px 0px -2px rgba(255, 255, 255, 0.70),
    inset -3px -8px 1px -6px rgba(255, 255, 255, 0.44),
    inset -0.3px -1px 4px 0px rgba(12, 12, 32, 0.10),
    inset -1.5px 2.5px 0px -2px rgba(12, 12, 32, 0.12),
    inset 0px 3px 4px -2px rgba(12, 12, 32, 0.10),
    inset 2px -6.5px 1px -4px rgba(12, 12, 32, 0.06),
    0px 1px 5px 0px rgba(12, 12, 32, 0.08),
    0px 10px 28px -6px rgba(12, 12, 32, 0.12);
  --glass-shadow-active:
    inset 0 0 0 1px rgba(255, 255, 255, 0.12),
    inset 1px 1px 0 0 rgba(255, 255, 255, 0.50),
    inset -1px -1px 0 0 rgba(255, 255, 255, 0.32),
    0 2px 5px rgba(12, 12, 32, 0.10);

  --radius: 26px;
  --radius-s: 16px;

  --maxw: 1120px;
  --ease: cubic-bezier(0.32, 0.72, 0, 1);
  --spring: cubic-bezier(0.4, 1.3, 0.5, 1);

  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
          "Helvetica Neue", "Segoe UI", system-ui, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Menlo", "Cascadia Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-base: #0a0a0d;
    --text:   #f3f3f6;
    --text-2: #a9abb5;
    --text-3: #71737e;

    --accent:      #4f7dff;
    --accent-deep: #3f6cf0;
    --accent-text: #97b3ff;
    --on-accent:   #ffffff;

    --fill-1: rgba(145, 148, 165, 0.10);
    --fill-2: rgba(145, 148, 165, 0.17);

    --veil: rgba(255, 255, 255, 0.065);
    --veil-strong: rgba(26, 26, 31, 0.66);
    --glass-blur: 14px;
    --glass-sat: 145%;
    --glass-shadow:
      inset 0 0 0 1px rgba(255, 255, 255, 0.03),
      inset 1.8px 3px 0px -2px rgba(255, 255, 255, 0.27),
      inset -2px -2px 0px -2px rgba(255, 255, 255, 0.24),
      inset -3px -8px 1px -6px rgba(255, 255, 255, 0.18),
      inset -0.3px -1px 4px 0px rgba(0, 0, 0, 0.24),
      inset -1.5px 2.5px 0px -2px rgba(0, 0, 0, 0.40),
      inset 0px 3px 4px -2px rgba(0, 0, 0, 0.40),
      inset 2px -6.5px 1px -4px rgba(0, 0, 0, 0.20),
      0px 1px 5px 0px rgba(0, 0, 0, 0.22),
      0px 12px 30px -6px rgba(0, 0, 0, 0.30);
    --glass-shadow-active:
      inset 0 0 0 1px rgba(255, 255, 255, 0.03),
      inset 1px 1px 0 0 rgba(255, 255, 255, 0.15),
      inset -1px -1px 0 0 rgba(255, 255, 255, 0.10),
      0 2px 4px rgba(0, 0, 0, 0.15);
  }
}

:root[data-theme="dark"] {
  --bg-base: #0a0a0d;
  --text:   #f3f3f6;
  --text-2: #a9abb5;
  --text-3: #71737e;

  --accent:      #4f7dff;
  --accent-deep: #3f6cf0;
  --accent-text: #97b3ff;
  --on-accent:   #ffffff;

  --fill-1: rgba(145, 148, 165, 0.10);
  --fill-2: rgba(145, 148, 165, 0.17);

  --veil: rgba(255, 255, 255, 0.065);
  --veil-strong: rgba(26, 26, 31, 0.66);
  --glass-blur: 14px;
  --glass-sat: 145%;
  --glass-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.03),
    inset 1.8px 3px 0px -2px rgba(255, 255, 255, 0.27),
    inset -2px -2px 0px -2px rgba(255, 255, 255, 0.24),
    inset -3px -8px 1px -6px rgba(255, 255, 255, 0.18),
    inset -0.3px -1px 4px 0px rgba(0, 0, 0, 0.24),
    inset -1.5px 2.5px 0px -2px rgba(0, 0, 0, 0.40),
    inset 0px 3px 4px -2px rgba(0, 0, 0, 0.40),
    inset 2px -6.5px 1px -4px rgba(0, 0, 0, 0.20),
    0px 1px 5px 0px rgba(0, 0, 0, 0.22),
    0px 12px 30px -6px rgba(0, 0, 0, 0.30);
  --glass-shadow-active:
    inset 0 0 0 1px rgba(255, 255, 255, 0.03),
    inset 1px 1px 0 0 rgba(255, 255, 255, 0.15),
    inset -1px -1px 0 0 rgba(255, 255, 255, 0.10),
    0 2px 4px rgba(0, 0, 0, 0.15);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg-base);
  line-height: 1.5;
  letter-spacing: -0.008em;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; }
::selection { background: color-mix(in srgb, var(--accent) 24%, transparent); }

.wrap { width: min(92%, var(--maxw)); margin-inline: auto; }
.mono { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.02em; }

.bg { position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(58% 46% at 50% -8%, color-mix(in srgb, var(--accent) 13%, transparent) 0%, transparent 68%),
    radial-gradient(50% 42% at 12% 18%, #ffffff 0%, transparent 58%),
    radial-gradient(44% 38% at 88% 12%, #e2e5ef 0%, transparent 60%),
    radial-gradient(56% 48% at 76% 94%, #e6e9f3 0%, transparent 60%),
    linear-gradient(160deg, #f6f7fa 0%, #e9eaf1 100%);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .bg {
    background:
      radial-gradient(58% 46% at 50% -8%, color-mix(in srgb, var(--accent) 22%, transparent) 0%, transparent 68%),
      radial-gradient(48% 40% at 12% 20%, #2c2d35 0%, transparent 56%),
      radial-gradient(42% 36% at 88% 14%, #212228 0%, transparent 58%),
      radial-gradient(54% 46% at 74% 94%, #191a20 0%, transparent 58%),
      linear-gradient(155deg, #131419 0%, #060608 100%);
  }
}
:root[data-theme="dark"] .bg {
  background:
    radial-gradient(58% 46% at 50% -8%, color-mix(in srgb, var(--accent) 22%, transparent) 0%, transparent 68%),
    radial-gradient(48% 40% at 12% 20%, #2c2d35 0%, transparent 56%),
    radial-gradient(42% 36% at 88% 14%, #212228 0%, transparent 58%),
    radial-gradient(54% 46% at 74% 94%, #191a20 0%, transparent 58%),
    linear-gradient(155deg, #131419 0%, #060608 100%);
}

.glass-surface {
  background: var(--veil);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
}
.glass { box-shadow: var(--glass-shadow); }

@supports not (backdrop-filter: blur(1px)) {
  .glass-surface { background: var(--veil-strong); }
}
@media (prefers-reduced-transparency: reduce) {
  .glass-surface {
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    background: var(--veil-strong);
  }
}

.nav {
  position: sticky; top: 14px; z-index: 50;
  width: min(92%, var(--maxw));
  margin: 14px auto 0;
  height: 56px;
  padding: 0 10px 0 22px;
  border-radius: 999px;
  display: flex; align-items: center; gap: 18px;
}
.nav-brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 600; font-size: 1rem; letter-spacing: -0.02em;
}
.brand-dot {
  width: 9px; height: 9px; border-radius: 50%; flex: none;
  background: var(--accent);
  box-shadow: 0 0 14px 1px color-mix(in srgb, var(--accent) 70%, transparent);
}
.nav-links { display: flex; gap: 24px; margin-left: auto; }
.nav-links a {
  color: var(--text-2); font-size: 0.92rem; font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }
.nav-back {
  margin-left: auto;
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--text-2); font-size: 0.92rem; font-weight: 500;
  white-space: nowrap;
  transition: color 0.2s;
}
.nav-back svg { width: 14px; height: 14px; transition: transform 0.25s var(--ease); }
.nav-back:hover { color: var(--text); }
.nav-back:hover svg { transform: translateX(-3px); }
.nav-actions { display: flex; gap: 7px; margin-left: 16px; }

.pill {
  height: 38px; min-width: 44px; padding: 0 14px;
  border: 0; border-radius: 999px;
  background: var(--veil);
  -webkit-backdrop-filter: blur(10px) saturate(var(--glass-sat));
  backdrop-filter: blur(10px) saturate(var(--glass-sat));
  box-shadow: var(--glass-shadow);
  color: var(--text);
  font: inherit; font-size: 0.8rem; font-weight: 600; letter-spacing: 0.02em;
  cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  transition: transform 0.15s var(--ease), box-shadow 0.2s ease;
}
.pill:hover { transform: translateY(-1px); }
.pill:active { transform: translateY(0); box-shadow: var(--glass-shadow-active); }
.pill.icon { width: 44px; padding: 0; }
.pill.icon svg { width: 17px; height: 17px; }

.i-moon { display: none; }
:root[data-theme="dark"] .i-sun { display: none; }
:root[data-theme="dark"] .i-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .i-sun { display: none; }
  :root:not([data-theme="light"]) .i-moon { display: block; }
}

.hero {
  padding: 104px 0 20px;
  text-align: center;
  display: flex; flex-direction: column; align-items: center;
}
.hero-title {
  font-size: clamp(2.9rem, 7.6vw, 5.4rem);
  font-weight: 680;
  letter-spacing: -0.042em;
  line-height: 1.0;
}
.hero-sub {
  color: var(--text-2);
  font-size: clamp(1.08rem, 2.2vw, 1.35rem);
  max-width: 42ch;
  margin-top: 20px;
}

.section { padding: 72px 0 12px; }
.sec-head {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 650; letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 18px;
}
.tile {
  border-radius: var(--radius);
  padding: 30px;
  position: relative;
  transition: transform 0.35s var(--spring), box-shadow 0.3s ease;
  will-change: transform;
}
.tile:hover { transform: translateY(-4px); }
a.tile:active { transform: translateY(-1px) scale(0.99); box-shadow: var(--glass-shadow-active); }

.tile-app {
  grid-column: span 12;
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 40px;
  align-items: center;
}
.app-main { display: flex; flex-direction: column; gap: 22px; min-width: 0; }
.app-preview {
  background: var(--fill-1);
  border-radius: 20px;
  padding: 22px;
  align-self: stretch;
  display: flex; flex-direction: column; justify-content: center;
}
.tile-app .app-head { display: flex; align-items: center; gap: 20px; }
.app-icon {
  width: 76px; height: 76px; border-radius: 19px;
  box-shadow: 0 12px 28px -8px rgba(0, 0, 0, 0.4);
}
.app-name { font-size: 1.8rem; font-weight: 650; letter-spacing: -0.03em; line-height: 1.05; }
.app-tag { color: var(--text-2); font-size: 1.05rem; margin-top: 6px; max-width: 50ch; }
.chip-row { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  display: inline-flex; align-items: center;
  height: 30px; padding: 0 13px; border-radius: 999px;
  background: var(--fill-2); color: var(--text-2);
  font-size: 0.8rem; font-weight: 570;
  white-space: nowrap;
}
.tile-app .app-cta { display: flex; gap: 14px; align-items: center; margin-top: 4px; flex-wrap: wrap; }

.btn-primary {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 50px; padding: 0 27px; border-radius: 999px;
  background: var(--accent); color: var(--on-accent);
  font-size: 0.97rem; font-weight: 570;
  box-shadow:
    inset 0 1px 0 0 rgba(255, 255, 255, 0.30),
    inset 0 -1px 1px 0 rgba(0, 0, 30, 0.18),
    0 2px 7px -1px color-mix(in srgb, var(--accent) 50%, transparent),
    0 10px 26px -6px color-mix(in srgb, var(--accent) 45%, transparent);
  transition: transform 0.15s var(--ease), box-shadow 0.2s ease, background 0.2s;
}
.btn-primary:hover {
  transform: translateY(-2px);
  background: var(--accent-deep);
  box-shadow:
    inset 0 1px 0 0 rgba(255, 255, 255, 0.30),
    inset 0 -1px 1px 0 rgba(0, 0, 30, 0.18),
    0 3px 9px -1px color-mix(in srgb, var(--accent) 55%, transparent),
    0 16px 34px -6px color-mix(in srgb, var(--accent) 50%, transparent);
}
.btn-primary:active { transform: translateY(0) scale(0.97); }

.btn-quiet {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 50px; padding: 0 24px; border-radius: 999px;
  background: var(--fill-2); color: var(--text);
  font-size: 0.97rem; font-weight: 550;
  transition: background 0.2s, transform 0.15s var(--ease);
}
.btn-quiet:hover { background: var(--fill-1); transform: translateY(-2px); }
.btn-quiet:active { transform: scale(0.97); }
.btn-quiet svg { width: 15px; height: 15px; transition: transform 0.25s var(--ease); }
.btn-quiet:hover svg { transform: translateX(3px); }

.btn-glass {
  display: inline-flex; flex-direction: column; align-items: flex-start; justify-content: center;
  gap: 3px;
  padding: 14px 26px 13px;
  border-radius: 22px;
  background: var(--veil);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  box-shadow: var(--glass-shadow);
  transition: transform 0.2s var(--spring), box-shadow 0.2s ease;
}
.btn-glass:hover { transform: translateY(-3px); }
.btn-glass:active { transform: translateY(0); box-shadow: var(--glass-shadow-active); }
.btn-glass b { font-size: 0.99rem; font-weight: 600; }
.btn-glass .mono { color: var(--text-3); }

.k-hero { padding: 96px 0 24px; }
.k-hero-grid {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 56px;
  align-items: center;
}
.k-icon {
  width: 100px; height: 100px; border-radius: 25px;
  box-shadow: 0 18px 42px -10px rgba(0, 0, 0, 0.5);
  margin-bottom: 28px;
}
.k-title {
  font-size: clamp(3rem, 7.6vw, 4.9rem);
  font-weight: 680; letter-spacing: -0.042em; line-height: 1.04;
  padding-bottom: 0.06em;
}
.k-sub {
  color: var(--text-2);
  font-size: clamp(1.08rem, 2.2vw, 1.3rem);
  max-width: 38ch; margin-top: 16px;
}
.k-sub2 {
  color: var(--text-3);
  font-size: clamp(0.95rem, 1.8vw, 1.05rem);
  max-width: 44ch; margin-top: 12px;
}
.dl-block { display: flex; gap: 14px; margin-top: 32px; flex-wrap: wrap; }
.dl-note { color: var(--text-3); margin-top: 20px; max-width: 58ch; line-height: 1.7; }
.dl-hash { margin-top: 12px; max-width: 58ch; }
.dl-hash summary { color: var(--text-3); cursor: pointer; }
.dl-hash summary:hover { color: var(--text-2); }
.dl-hash p {
  color: var(--text-3);
  font-size: 0.7rem; line-height: 1.7;
  margin-top: 8px; word-break: break-all;
}

.preview {
  border-radius: var(--radius);
  padding: 26px;
  width: min(400px, 100%);
  justify-self: end;
}
.chat { display: flex; flex-direction: column; gap: 10px; }
.msg {
  max-width: 82%;
  padding: 11px 15px;
  border-radius: 19px;
  font-size: 0.95rem; line-height: 1.4;
}
.msg.them {
  align-self: flex-start;
  background: var(--fill-2);
  border-bottom-left-radius: 7px;
}
.msg.me {
  align-self: flex-end;
  background: var(--accent); color: var(--on-accent);
  border-bottom-right-radius: 7px;
  box-shadow: inset 0 1px 0 0 rgba(255, 255, 255, 0.24);
}
.msg.locked { display: inline-flex; align-items: center; gap: 8px; }
.msg.locked svg { width: 13px; height: 13px; opacity: 0.85; }
.msg.locked .cipher { font-family: var(--mono); font-size: 0.83rem; letter-spacing: 0.03em; }

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.step {
  border-radius: var(--radius);
  padding: 28px 30px;
  transition: transform 0.35s var(--spring), box-shadow 0.3s ease;
}
.step:hover { transform: translateY(-4px); }
.step-num {
  width: 34px; height: 34px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--accent); color: var(--on-accent);
  font-weight: 650; font-size: 0.95rem;
  margin-bottom: 16px;
  box-shadow:
    inset 0 1px 0 0 rgba(255, 255, 255, 0.30),
    0 6px 16px -4px color-mix(in srgb, var(--accent) 55%, transparent);
}
.step h3 { font-size: 1.12rem; font-weight: 620; letter-spacing: -0.015em; }
.step p { color: var(--text-2); font-size: 0.95rem; margin-top: 7px; }

.tile-feat { grid-column: span 4; }
.tile-feat.feat-wide { grid-column: span 8; }
.feat-ic {
  width: 48px; height: 48px; border-radius: 14px;
  display: grid; place-items: center;
  background: var(--fill-2); color: var(--accent-text);
  margin-bottom: 18px;
}
.feat-ic svg { width: 24px; height: 24px; }
.tile-feat h3 { font-size: 1.12rem; font-weight: 620; letter-spacing: -0.015em; }
.tile-feat p { color: var(--text-2); font-size: 0.95rem; margin-top: 7px; }

.tile-spec { grid-column: span 6; padding: 26px 30px; }
.tile-spec small {
  display: block; color: var(--text-3);
  font-size: 0.8rem; font-weight: 600; letter-spacing: 0.04em;
  margin-bottom: 8px;
}
.tile-spec p { color: var(--text-2); font-size: 0.97rem; }

.footer { margin-top: 64px; padding-bottom: 34px; }
.footer-card {
  border-radius: 22px;
  padding: 18px 24px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap;
}
.footer-note small {
  display: block; color: var(--text-3);
  font-size: 0.76rem; font-weight: 600;
  letter-spacing: 0.06em; text-transform: uppercase;
  margin-bottom: 3px;
}
.footer-note b { font-size: 1.06rem; font-weight: 620; letter-spacing: -0.015em; }
.footer-contacts { display: flex; gap: 10px; flex-wrap: wrap; }
.contact-pill {
  display: inline-flex; align-items: center; gap: 9px;
  height: 42px; padding: 0 18px; border-radius: 999px;
  background: var(--fill-2);
  font-size: 0.92rem; font-weight: 570;
  transition: transform 0.15s var(--ease), background 0.2s, box-shadow 0.2s ease;
}
.contact-pill svg { width: 17px; height: 17px; color: var(--accent-text); flex: none; }
.contact-pill:hover {
  transform: translateY(-2px);
  background: var(--fill-1);
  box-shadow: 0 6px 18px -6px rgba(0, 0, 0, 0.25);
}
.contact-pill:active { transform: translateY(0) scale(0.98); }
.footer-in {
  margin-top: 22px;
  display: flex; justify-content: space-between; align-items: center;
  gap: 14px; flex-wrap: wrap;
  color: var(--text-3);
  font-size: 0.86rem;
}
.footer-in a { color: var(--text-3); transition: color 0.2s; }
.footer-in a:hover { color: var(--text); }

.js .reveal {
  opacity: 0;
  transform: translateY(18px) scale(0.985);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.js .reveal.in { opacity: 1; transform: none; }

@media (max-width: 960px) {
  .k-hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .preview { justify-self: start; }
  .tile-app { grid-template-columns: 1fr; gap: 26px; }
  .app-preview { display: none; }
  .tile-feat { grid-column: span 6; }
  .tile-feat.feat-wide { grid-column: span 12; }
  .steps { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .nav-links { display: none; }
  .nav-actions { margin-left: auto; }
  .hero { padding-top: 88px; }
  .section { padding: 56px 0 8px; }
}
@media (max-width: 520px) {
  .nav-back span { display: none; }
  .nav-back svg { width: 18px; height: 18px; }
}
@media (max-width: 620px) {
  .tile-feat { grid-column: span 12; }
  .footer-card { flex-direction: column; align-items: flex-start; padding: 22px; }
  .footer-contacts { width: 100%; flex-direction: column; }
  .contact-pill { justify-content: center; }
  .footer-in { flex-direction: column; align-items: center; gap: 6px; }
  .tile-spec { grid-column: span 12; }
  .tile { padding: 24px; }
  .dl-block { flex-direction: column; align-items: stretch; }
  .btn-glass { align-items: center; }
  .app-icon { width: 64px; height: 64px; border-radius: 16px; }
  .app-name { font-size: 1.5rem; }
}

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 10px; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
  .js .reveal { opacity: 1; transform: none; }
}