/* ==========================================================================
   Шкатулка — общая дизайн-система
   Layout concept: спокойный тёмный «сейф», крупная витринная типографика
   в духе журнального стиля + мягкие микро-анимации на отклик пользователя.
   ========================================================================== */

:root{
  --bg: #0a0b0d;
  --bg-elevated: #131519;
  --bg-elevated-2: #191c22;
  --line: #24272e;
  --fg: #eef0f3;
  --fg-dim: #8b919b;
  --fg-faint: #585e68;
  --accent: #7fe3cd;
  --accent-ink: #06211c;
  --accent-soft: #14312c;
  --warn: #f0b259;
  --danger: #f08a7a;
  color-scheme: dark;

  --font-display: "Unbounded", "Manrope", system-ui, sans-serif;
  --font-body: "Manrope", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --container: 1120px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background:
    radial-gradient(1000px 560px at 12% -8%, #16211f 0%, transparent 60%),
    radial-gradient(760px 420px at 100% 0%, #10191d 0%, transparent 55%),
    var(--bg);
  color:var(--fg);
  font-family:var(--font-body);
  -webkit-font-smoothing:antialiased;
  padding-left:max(16px, env(safe-area-inset-left,0px));
  padding-right:max(16px, env(safe-area-inset-right,0px));
}

a{color:inherit; text-decoration:none}
img,svg{max-width:100%; display:block}
[hidden]{display:none!important}

::selection{background:var(--accent); color:var(--accent-ink)}

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

h1,h2,h3{
  font-family:var(--font-display);
  font-weight:600;
  line-height:1.12;
  letter-spacing:-0.01em;
  text-wrap:balance;
  margin:0;
}

p{margin:0; line-height:1.65}

.container{
  max-width:var(--container);
  margin:0 auto;
  padding-inline:4px;
}

.eyebrow{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--accent);
  display:inline-flex;
  align-items:center;
  gap:8px;
}
.eyebrow::before{
  content:"";
  width:6px;height:6px;border-radius:50%;
  background:var(--accent);
  box-shadow:0 0 0 3px var(--accent-soft);
}

/* ---------- nav ---------- */
.nav{
  position:sticky;
  top:env(safe-area-inset-top,0px);
  z-index:20;
  padding-block:16px;
  background:color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter:blur(10px);
  border-bottom:1px solid transparent;
  transition:border-color .2s;
}
.nav.scrolled{border-bottom-color:var(--line)}
.nav .row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
}
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-display);
  font-size:16px;
  font-weight:600;
}
.brand .box{
  width:26px;height:26px;
  border-radius:7px;
  background:linear-gradient(145deg, var(--accent), #4fb8a4);
  display:flex;align-items:center;justify-content:center;
  color:var(--accent-ink);
  font-size:13px;
  flex:none;
}
.nav-links{
  display:flex;
  align-items:center;
  gap:22px;
  font-size:14px;
  color:var(--fg-dim);
}
.nav-links a{transition:color .15s}
.nav-links a:hover{color:var(--fg)}

/* ---------- buttons ---------- */
.btn{
  font-family:var(--font-body);
  font-weight:600;
  font-size:14.5px;
  padding:12px 22px;
  border-radius:10px;
  border:1px solid transparent;
  cursor:pointer;
  transition:transform .12s ease, filter .15s ease, background .15s ease, border-color .15s ease;
  display:inline-flex;
  align-items:center;
  gap:8px;
  white-space:nowrap;
}
.btn:active{transform:translateY(1px) scale(.99)}
.btn-primary{
  background:var(--accent);
  color:var(--accent-ink);
}
.btn-primary:hover{filter:brightness(1.07)}
.btn-ghost{
  background:transparent;
  color:var(--fg);
  border-color:var(--line);
}
.btn-ghost:hover{border-color:var(--accent); color:var(--accent)}
.btn-block{width:100%; justify-content:center}
.btn[disabled]{opacity:.5; cursor:not-allowed; filter:none}

/* ---------- hero ---------- */
.hero{
  padding-block:min(14vw, 96px) 56px;
}
.hero-grid{
  display:grid;
  grid-template-columns:1.2fr .8fr;
  gap:40px;
  align-items:center;
}
@media (max-width:860px){
  .hero-grid{grid-template-columns:1fr}
}
.hero h1{
  font-size:clamp(34px, 5.4vw, 64px);
  margin-top:18px;
}
.hero .lead{
  margin-top:20px;
  max-width:52ch;
  color:var(--fg-dim);
  font-size:17px;
}
.hero .actions{
  margin-top:32px;
  display:flex;
  gap:12px;
  flex-wrap:wrap;
}

/* seal/box visual */
.seal{
  position:relative;
  aspect-ratio:1/1;
  max-width:360px;
  margin-inline:auto;
  border-radius:28px;
  background:linear-gradient(160deg, var(--bg-elevated), var(--bg-elevated-2));
  border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;
  overflow:hidden;
}
.seal::before{
  content:"";
  position:absolute;
  inset:-40%;
  background:conic-gradient(from 90deg, transparent, var(--accent-soft), transparent 40%);
  animation:spin 10s linear infinite;
}
@media (prefers-reduced-motion: reduce){ .seal::before{animation:none} }
@keyframes spin{to{transform:rotate(360deg)}}
.seal .core{
  position:relative;
  width:58%;
  aspect-ratio:1/1;
  border-radius:50%;
  background:var(--bg);
  border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;
}
.seal svg{width:42%; height:42%; color:var(--accent)}

/* ---------- sections ---------- */
section{padding-block:64px}
.section-head{
  max-width:60ch;
  margin-bottom:36px;
}
.section-head h2{
  font-size:clamp(24px, 3vw, 34px);
  margin-top:14px;
}
.section-head p{
  margin-top:14px;
  color:var(--fg-dim);
  font-size:15.5px;
}

/* bento / use-cases */
.bento{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:14px;
}
@media (max-width:860px){ .bento{grid-template-columns:1fr} }
.card{
  background:var(--bg-elevated);
  border:1px solid var(--line);
  border-radius:16px;
  padding:24px;
  transition:border-color .2s, transform .2s;
}
.card:hover{border-color:var(--accent-soft); transform:translateY(-2px)}
.card .num{
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--accent);
  background:var(--accent-soft);
  width:26px;height:26px;
  border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  margin-bottom:16px;
}
.card h3{font-size:17px; font-weight:600}
.card p{margin-top:8px; color:var(--fg-dim); font-size:14px}

/* steps */
.steps-row{
  display:grid;
  grid-template-columns:repeat(4, 1fr);
  gap:14px;
}
@media (max-width:860px){ .steps-row{grid-template-columns:1fr 1fr} }
@media (max-width:520px){ .steps-row{grid-template-columns:1fr} }
.step{
  padding:20px;
  border-radius:14px;
  border:1px solid var(--line);
  background:linear-gradient(180deg, var(--bg-elevated), transparent);
}
.step .n{
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--fg-faint);
  margin-bottom:10px;
}
.step h4{font-size:15px; font-weight:600; margin:0 0 6px}
.step p{font-size:13.5px; color:var(--fg-dim)}

/* ---------- panel (encrypt/decrypt forms) ---------- */
.panel{
  background:var(--bg-elevated);
  border:1px solid var(--line);
  border-radius:18px;
  padding:clamp(20px, 4vw, 36px);
}
.field{
  display:flex;
  flex-direction:column;
  gap:8px;
  margin-bottom:18px;
}
.field label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--fg-dim);
}
.field .hint{font-size:12.5px; color:var(--fg-faint)}
textarea, input[type="text"], input[type="password"], select{
  width:100%;
  background:var(--bg);
  border:1px solid var(--line);
  color:var(--fg);
  font-family:var(--font-body);
  font-size:15px;
  padding:13px 14px;
  border-radius:10px;
  transition:border-color .15s;
}
textarea{font-family:var(--font-mono); font-size:14px; min-height:120px; resize:vertical; line-height:1.55}
textarea:focus, input:focus, select:focus{border-color:var(--accent)}
input::placeholder, textarea::placeholder{color:var(--fg-faint)}

.pw-row{display:flex; gap:8px}
.pw-row input{flex:1; min-width:0}
.icon-toggle{
  background:var(--bg);
  border:1px solid var(--line);
  color:var(--fg-dim);
  font-family:var(--font-mono);
  font-size:12px;
  padding:0 14px;
  border-radius:10px;
  cursor:pointer;
}
.icon-toggle:hover{color:var(--accent); border-color:var(--accent-soft)}

.row-2{display:grid; grid-template-columns:1fr 1fr; gap:16px}
@media (max-width:560px){ .row-2{grid-template-columns:1fr} }

.status-msg{
  font-size:13.5px;
  font-family:var(--font-mono);
  min-height:1.4em;
  margin-top:14px;
}
.status-msg.ok{color:var(--accent)}
.status-msg.err{color:var(--danger)}

.result-box{
  margin-top:22px;
  padding:18px;
  border-radius:12px;
  border:1px dashed var(--accent-soft);
  background:var(--accent-soft);
  display:none;
}
.result-box.show{display:block}
.result-box .label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--accent);
}
.result-link{
  margin-top:10px;
  display:flex;
  gap:8px;
  align-items:center;
}
.result-link code{
  flex:1;
  min-width:0;
  overflow-x:auto;
  white-space:nowrap;
  background:var(--bg);
  border:1px solid var(--line);
  border-radius:8px;
  padding:10px 12px;
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--fg);
}
.warn-line{
  margin-top:14px;
  font-size:12.5px;
  color:var(--warn);
  display:flex;
  gap:8px;
  align-items:flex-start;
}

.qr-area{
  margin-top:20px;
  padding-top:18px;
  border-top:1px solid var(--accent-soft);
}
.qr-check{
  display:flex;
  align-items:flex-start;
  gap:10px;
  font-size:13.5px;
  color:var(--fg);
  cursor:pointer;
}
.qr-check input{
  margin-top:3px;
  flex:none;
  width:16px;height:16px;
  accent-color:var(--accent);
}
.qr-box{
  margin-top:16px;
  display:flex;
  gap:18px;
  align-items:center;
  flex-wrap:wrap;
}
.qr-box img{
  width:140px;height:140px;
  border-radius:12px;
  background:#fff;
  padding:8px;
  border:1px solid var(--line);
  flex:none;
}
.qr-side{
  flex:1 1 180px;
  min-width:0;
  display:flex;
  flex-direction:column;
  gap:10px;
  align-items:flex-start;
}
.qr-side .hint{margin:0}

.plain-result{
  margin-top:20px;
  padding:20px;
  border-radius:12px;
  background:var(--bg);
  border:1px solid var(--line);
  word-break:break-word;
  white-space:pre-wrap;
  font-family:var(--font-mono);
  font-size:14.5px;
  line-height:1.6;
}
.plain-result a{color:var(--accent); text-decoration:underline}

/* faq */
details.faq{
  border-bottom:1px solid var(--line);
  padding-block:18px;
}
details.faq summary{
  cursor:pointer;
  list-style:none;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  font-size:15.5px;
  font-weight:600;
}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary .chev{color:var(--accent); transition:transform .15s; flex:none}
details.faq[open] summary .chev{transform:rotate(45deg)}
details.faq .faq-body{
  margin-top:12px;
  color:var(--fg-dim);
  font-size:14.5px;
  line-height:1.65;
  max-width:68ch;
}

/* footer */
footer.site{
  border-top:1px solid var(--line);
  padding-block:32px;
  margin-top:40px;
}
footer.site .row{
  display:flex;
  justify-content:space-between;
  align-items:center;
  flex-wrap:wrap;
  gap:12px;
  font-size:13px;
  color:var(--fg-faint);
}

.back-link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:13.5px;
  color:var(--fg-dim);
  margin-bottom:28px;
}
.back-link:hover{color:var(--accent)}

.badge-row{
  display:flex;
  gap:8px;
  flex-wrap:wrap;
  margin-top:18px;
}
.badge{
  font-family:var(--font-mono);
  font-size:11.5px;
  color:var(--fg-dim);
  border:1px solid var(--line);
  border-radius:999px;
  padding:5px 11px;
}

.skeleton{
  height:14px;
  border-radius:4px;
  background:linear-gradient(90deg, var(--line) 25%, var(--bg-elevated-2) 50%, var(--line) 75%);
  background-size:200% 100%;
  animation:shimmer 1.4s infinite;
}
@keyframes shimmer{ to{background-position:-200% 0} }