/* ZS Voice — публичный лендинг
   Кастомный CSS, без фреймворков. Тёмная тема, оптическая типографика. */

/* ===== TOKENS ===== */
:root {
  --bg:            #0A0A0B;
  --bg-elev:       #101014;
  --bg-elev-2:     #14141A;
  --bg-card:       #0F0F13;
  --line:          rgba(255, 255, 255, .06);
  --line-strong:   rgba(255, 255, 255, .10);
  --fg:            #ECECF1;
  --fg-mute:       #9A9AA6;
  --fg-dim:        #6B6B78;
  --accent:        #7C6FF0;
  --accent-2:      #8B7CF6;
  --accent-soft:   rgba(124, 111, 240, .12);
  --accent-line:   rgba(124, 111, 240, .28);
  --danger:        #F26D6D;
  --ok:            #6DDCA6;

  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 22px;

  --ease: cubic-bezier(.2, .7, .2, 1);
  --shadow-1: 0 1px 0 rgba(255,255,255,.04) inset, 0 8px 24px rgba(0,0,0,.28);
  --shadow-2: 0 1px 0 rgba(255,255,255,.06) inset, 0 20px 60px rgba(0,0,0,.5);

  --container: 1160px;
  --pad-x: clamp(20px, 4vw, 40px);

  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "cv11", "kern";
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
a:hover { color: #fff; }
button { font: inherit; cursor: pointer; }
code, kbd { font-family: var(--font-mono); font-size: .92em; }

.skip {
  position: absolute; left: -9999px;
  padding: 8px 12px; background: var(--accent); color: #fff; z-index: 100;
  border-radius: 6px;
}
.skip:focus { left: 12px; top: 12px; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
}

/* ===== NAV ===== */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10, 10, 11, .72);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav__inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px; gap: 24px;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 620; letter-spacing: -0.01em; color: var(--fg);
}
.brand img { border-radius: 6px; }
.nav__links {
  display: flex; gap: 28px;
  color: var(--fg-mute); font-size: 14px;
}
.nav__links a { transition: color .2s var(--ease); }
.nav__cta .btn { padding: 8px 14px; font-size: 14px; }

@media (max-width: 780px) {
  .nav__links { display: none; }
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-weight: 550;
  font-size: 14.5px;
  letter-spacing: -0.005em;
  transition: transform .12s var(--ease), background .18s var(--ease), border-color .18s var(--ease), color .18s var(--ease);
  will-change: transform;
}
.btn:active { transform: translateY(1px); }
.btn--primary {
  background: linear-gradient(180deg, #8b7cf6, #6a5be5);
  color: #fff;
  box-shadow: 0 1px 0 rgba(255,255,255,.24) inset, 0 8px 24px rgba(107,90,229,.32);
  border-color: rgba(255,255,255,.06);
}
.btn--primary:hover { color: #fff; filter: brightness(1.05); }
.btn--ghost {
  background: transparent;
  color: var(--fg);
  border-color: var(--line-strong);
}
.btn--ghost:hover { background: rgba(255,255,255,.03); border-color: rgba(255,255,255,.16); }
.btn--lg { padding: 13px 20px; font-size: 15.5px; border-radius: 12px; }

/* ===== HERO ===== */
.hero {
  position: relative;
  padding: clamp(56px, 8vw, 96px) 0 clamp(48px, 6vw, 72px);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute; inset: -20% -10% auto -10%; height: 620px;
  background:
    radial-gradient(60% 55% at 30% 30%, rgba(124,111,240,.18), transparent 60%),
    radial-gradient(40% 40% at 80% 10%, rgba(124,111,240,.10), transparent 60%);
  z-index: -1;
  filter: blur(20px);
  pointer-events: none;
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
}
@media (max-width: 900px) {
  .hero__grid { grid-template-columns: 1fr; }
}

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px 6px 10px;
  border: 1px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,0));
  border-radius: 999px;
  color: var(--fg-mute);
  font-size: 12.5px;
  letter-spacing: 0;
  margin-bottom: 22px;
}
.eyebrow .dot {
  width: 6px; height: 6px; border-radius: 999px;
  background: var(--ok);
  box-shadow: 0 0 0 3px rgba(109, 220, 166, .18);
}

.h1 {
  font-size: clamp(40px, 6.2vw, 68px);
  line-height: 1.02;
  letter-spacing: -0.028em;
  font-weight: 640;
  margin: 0 0 20px;
}
.h1__accent {
  background: linear-gradient(180deg, #b1a5ff, #7c6ff0 70%);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.lede {
  color: var(--fg-mute);
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.55;
  max-width: 560px;
  margin: 0 0 28px;
}
.lede--tight { max-width: 640px; }

.hero__cta { display: flex; gap: 12px; margin-bottom: 32px; flex-wrap: wrap; }

.trust {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-wrap: wrap; gap: 8px 18px;
  color: var(--fg-dim); font-size: 13px;
}
.trust li { position: relative; padding-left: 14px; }
.trust li::before {
  content: ""; position: absolute; left: 0; top: 8px;
  width: 6px; height: 6px; border-radius: 999px;
  background: var(--line-strong);
}

/* ===== HERO MOCK ===== */
.hero__mock { justify-self: end; width: 100%; max-width: 560px; }
.mock {
  position: relative;
  display: grid;
  grid-template-columns: 200px 1fr;
  height: 420px;
  border-radius: 18px;
  background: linear-gradient(180deg, #131319, #0d0d12);
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-2);
  overflow: hidden;
  transform: perspective(1400px) rotateY(-4deg) rotateX(2deg);
  transform-origin: center;
}
.mock::after {
  content: "";
  position: absolute; inset: 0;
  border-radius: 18px;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(255,255,255,.04), transparent 20%);
}
.mock__sidebar {
  border-right: 1px solid var(--line);
  background: linear-gradient(180deg, #0d0d13, #0b0b10);
  padding: 14px 10px;
  display: flex; flex-direction: column; gap: 14px;
  min-width: 0;
}
.mock__srvs { display: flex; gap: 8px; padding: 0 4px; }
.mock__srv {
  width: 30px; height: 30px; border-radius: 9px;
  display: grid; place-items: center;
  background: #1a1a22; color: #cfcfe0; font-size: 12px; font-weight: 620;
  border: 1px solid var(--line);
}
.mock__srv.is-active {
  background: linear-gradient(180deg, #8b7cf6, #6a5be5);
  color: #fff;
  box-shadow: 0 6px 20px rgba(107,90,229,.35);
  border-color: transparent;
}
.mock__srv--plus { color: var(--ok); background: rgba(109,220,166,.10); border-color: rgba(109,220,166,.24); }
.mock__srv i { font-style: normal; }

.mock__channels { display: flex; flex-direction: column; gap: 2px; overflow: hidden; }
.mock__cat {
  padding: 6px 8px 2px;
  font-size: 10.5px; text-transform: uppercase; letter-spacing: .12em;
  color: var(--fg-dim);
}
.mock__chan {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 8px;
  color: var(--fg-mute); font-size: 13px;
  border-radius: 6px;
}
.mock__chan.is-active { background: rgba(255,255,255,.04); color: #fff; }

.mock__main { display: flex; flex-direction: column; min-width: 0; }
.mock__header {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  font-size: 13.5px;
  color: #fff;
}
.mock__hash { color: var(--fg-dim); font-weight: 700; }
.mock__lock {
  margin-left: auto;
  color: var(--accent-2);
  display: inline-flex;
  padding: 4px 8px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  border-radius: 999px;
}
.mock__feed { flex: 1; padding: 14px 16px; display: flex; flex-direction: column; gap: 14px; overflow: hidden; }
.msg { display: flex; gap: 10px; }
.msg__ava {
  width: 32px; height: 32px; border-radius: 8px;
  display: grid; place-items: center;
  font-size: 12px; font-weight: 620; color: #fff;
  background: hsl(var(--seed, 240) 60% 55%);
  flex-shrink: 0;
}
.msg__meta { display: flex; gap: 8px; align-items: baseline; font-size: 13px; }
.msg__meta b { color: #fff; font-weight: 620; }
.msg__meta em { font-style: normal; color: var(--fg-dim); font-size: 11.5px; }
.msg__body { color: var(--fg); font-size: 13.5px; margin-top: 2px; }
.msg__body--voice {
  margin-top: 6px;
  padding: 8px 12px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  border-radius: 999px;
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--accent-2);
}
.msg__body--voice em { color: var(--fg-mute); font-style: normal; font-size: 12px; }
.wf { display: inline-flex; align-items: center; gap: 2px; height: 20px; }
.wf i {
  display: inline-block;
  width: 2.5px; border-radius: 2px;
  background: currentColor;
  height: calc(20px * var(--h));
  opacity: .8;
}

.mock__input {
  border-top: 1px solid var(--line);
  padding: 12px 16px;
  color: var(--fg-dim); font-size: 13px;
  display: flex; align-items: center; justify-content: space-between;
}
.mock__inputBadge {
  font-size: 10.5px; letter-spacing: .08em;
  color: var(--ok);
  border: 1px solid rgba(109,220,166,.28);
  background: rgba(109,220,166,.10);
  padding: 2px 8px; border-radius: 999px;
}

@media (max-width: 900px) {
  .mock { transform: none; height: 380px; grid-template-columns: 180px 1fr; }
}
@media (max-width: 560px) {
  .mock { grid-template-columns: 62px 1fr; }
  .mock__channels { display: none; }
  .mock__srvs { flex-direction: column; }
}

/* ===== SECTIONS ===== */
.section {
  padding: clamp(64px, 8vw, 112px) 0;
  border-top: 1px solid var(--line);
}
.section--dark { background: var(--bg-elev); }
.section--muted { background: linear-gradient(180deg, var(--bg), var(--bg-elev)); }
.section--card { background: var(--bg); }

.section__head { max-width: 700px; margin-bottom: 44px; }
.tag {
  display: inline-block;
  color: var(--accent-2);
  font-size: 12px; text-transform: uppercase; letter-spacing: .14em; font-weight: 600;
  margin-bottom: 14px;
}
.h2 {
  font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1.1;
  letter-spacing: -0.022em;
  font-weight: 620;
  margin: 0;
}
.h2--tight { max-width: 520px; }

/* ===== FEATURES ===== */
.feats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
@media (max-width: 900px) { .feats { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .feats { grid-template-columns: 1fr; } }

.feat {
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}
.feat:hover { border-color: var(--line-strong); transform: translateY(-2px); }
.feat__icon {
  width: 40px; height: 40px; border-radius: 10px;
  display: grid; place-items: center;
  color: var(--accent-2);
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  margin-bottom: 16px;
}
.feat h3 { font-size: 17px; margin: 0 0 6px; letter-spacing: -0.01em; }
.feat p { margin: 0; color: var(--fg-mute); font-size: 14.5px; line-height: 1.55; }

/* ===== SECURITY ===== */
.security__grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 56px;
  align-items: center;
}
@media (max-width: 900px) { .security__grid { grid-template-columns: 1fr; } }

.stat {
  margin: 28px 0 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
@media (max-width: 620px) { .stat { grid-template-columns: 1fr; } }
.stat > div {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}
.stat dt { font-size: 26px; letter-spacing: -0.02em; font-weight: 620; color: #fff; }
.stat dd { margin: 4px 0 0; color: var(--fg-mute); font-size: 13px; line-height: 1.4; }

.security__card {
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-1);
}
.security__row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}
.security__row:last-of-type { border-bottom: none; }
.security__row span { color: var(--fg-mute); }
.security__row code {
  background: rgba(255,255,255,.03);
  padding: 4px 10px;
  border-radius: 6px;
  color: #fff;
  border: 1px solid var(--line);
}
.security__note {
  margin-top: 14px;
  padding: 12px 14px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  border-radius: 10px;
  color: var(--accent-2);
  font-size: 13px;
}

/* ===== STEPS ===== */
.steps {
  list-style: none; padding: 0; margin: 0;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
  counter-reset: none;
}
@media (max-width: 900px) { .steps { grid-template-columns: 1fr; } }
.steps li {
  display: flex; gap: 20px;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
}
.steps__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent-2);
  padding: 4px 8px;
  height: fit-content;
  border-radius: 6px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
}
.steps h3 { margin: 0 0 6px; font-size: 17px; letter-spacing: -0.01em; }
.steps p  { margin: 0; color: var(--fg-mute); font-size: 14.5px; line-height: 1.55; }

/* ===== SIGNUP ===== */
.signup {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 5vw, 64px);
  padding: clamp(36px, 5vw, 56px);
  background: linear-gradient(180deg, #12121A, #0D0D13);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-xl);
  align-items: center;
}
@media (max-width: 900px) { .signup { grid-template-columns: 1fr; } }
.signup__form label {
  display: block;
  font-size: 13px; color: var(--fg-mute);
  margin-bottom: 8px;
}
.signup__form .row { display: flex; gap: 10px; }
.signup__form input {
  flex: 1;
  padding: 12px 14px;
  background: #0A0A0E;
  border: 1px solid var(--line-strong);
  color: var(--fg);
  border-radius: 10px;
  font: inherit;
  outline: none;
  transition: border-color .18s var(--ease), background .18s var(--ease);
}
.signup__form input:focus {
  border-color: var(--accent-2);
  background: #0d0d14;
  box-shadow: 0 0 0 3px rgba(124,111,240,.18);
}
.signup__form .btn { white-space: nowrap; }
.msg-line {
  margin-top: 12px;
  font-size: 13px; color: var(--fg-mute);
}
.msg-line.err { color: var(--danger); }
.msg-line.ok  { color: var(--ok); }
.linkish {
  background: none; border: none; color: var(--accent-2);
  padding: 0; margin-left: 6px; text-decoration: underline; text-underline-offset: 2px;
}
.signup__done {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 14px 16px;
  background: rgba(109,220,166,.08);
  border: 1px solid rgba(109,220,166,.24);
  border-radius: 12px;
  color: var(--ok);
}
.signup__done div { color: var(--fg); }

/* ===== DOWNLOAD ===== */
.download { max-width: 780px; }
.download__row {
  display: flex; flex-wrap: wrap; gap: 12px;
  margin: 24px 0 18px;
}
.download__meta {
  color: var(--fg-dim);
  font-size: 13px;
  display: flex; flex-wrap: wrap; gap: 8px;
}
.download__meta code {
  background: rgba(255,255,255,.03);
  border: 1px solid var(--line);
  padding: 2px 8px;
  border-radius: 6px;
  color: var(--fg-mute);
}

/* ===== FAQ ===== */
.faq { display: grid; gap: 10px; max-width: 780px; }
.faq details {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--bg-card);
  padding: 4px 18px;
}
.faq summary {
  cursor: pointer;
  padding: 16px 0;
  font-size: 15.5px;
  letter-spacing: -0.005em;
  color: #fff;
  list-style: none;
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px;
}
.faq summary::after {
  content: "";
  width: 10px; height: 10px;
  border-right: 1.5px solid var(--fg-mute);
  border-bottom: 1.5px solid var(--fg-mute);
  transform: rotate(45deg) translateY(-2px);
  transition: transform .2s var(--ease);
}
.faq details[open] summary::after {
  transform: rotate(-135deg) translateY(-2px);
}
.faq p {
  margin: 0 0 16px;
  color: var(--fg-mute); font-size: 14.5px; line-height: 1.6;
}
.faq summary::-webkit-details-marker { display: none; }

/* ===== FOOTER ===== */
.foot {
  border-top: 1px solid var(--line);
  padding: 56px 0 40px;
  background: #08080A;
}
.foot__inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
}
@media (max-width: 720px) {
  .foot__inner { grid-template-columns: 1fr; }
}
.foot__brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 620; letter-spacing: -0.01em;
}
.foot__cols {
  display: grid; grid-template-columns: repeat(3, minmax(140px, auto));
  gap: 40px;
}
@media (max-width: 720px) { .foot__cols { grid-template-columns: 1fr 1fr; gap: 24px; } }
.foot__cols b {
  display: block;
  font-size: 12px; text-transform: uppercase; letter-spacing: .14em;
  color: var(--fg-dim); font-weight: 600;
  margin-bottom: 10px;
}
.foot__cols a {
  display: block;
  color: var(--fg-mute);
  font-size: 14px;
  padding: 4px 0;
}
.foot__meta {
  grid-column: 1 / -1;
  padding-top: 28px;
  margin-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--fg-dim);
  font-size: 12.5px;
  display: flex; gap: 10px;
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  .mock { transform: none; }
}