/* crypt.sitewireai.com — download page for Closed-Loop Messenger */

:root {
  --bg: #0b0d10;
  --bg-2: #0f1216;
  --surface: #14181d;
  --surface-2: #1a1f25;
  --line: #262e37;
  --text: #e7ebef;
  --muted: #9aa4af;
  --faint: #6b7480;
  --accent: #e5484d;
  --accent-deep: #c62828;
  --ok: #3fa66a;
  --radius: 14px;
  --maxw: 960px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(1100px 620px at 50% -12%, rgba(198, 40, 40, 0.20), transparent 62%),
    radial-gradient(760px 520px at 88% 8%, rgba(229, 72, 77, 0.10), transparent 60%),
    var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

/* ---------- top bar ---------- */

.nav {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 22px;
  max-width: var(--maxw);
  margin: 0 auto;
}
.nav .brand {
  display: flex;
  align-items: center;
  gap: 11px;
  font-weight: 650;
  letter-spacing: -0.01em;
}
.nav .brand img { width: 30px; height: 30px; border-radius: 8px; display: block; }
.nav .spacer { flex: 1; }
.nav .nav-link {
  color: var(--muted);
  text-decoration: none;
  font-size: 14.5px;
  font-weight: 550;
}
.nav .nav-link:hover { color: var(--text); }

/* ---------- hero ---------- */

.hero {
  text-align: center;
  padding: 46px 0 18px;
}
.hero .icon {
  width: 108px;
  height: 108px;
  border-radius: 26px;
  display: block;
  margin: 0 auto 26px;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.08) inset,
    0 22px 60px -18px rgba(198, 40, 40, 0.6),
    0 8px 30px -10px rgba(0, 0, 0, 0.7);
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(229, 72, 77, 0.10);
  border: 1px solid rgba(229, 72, 77, 0.28);
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 22px;
}
.eyebrow .pulse {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 rgba(229, 72, 77, 0.7);
  animation: pulse 2.4s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(229, 72, 77, 0.6); }
  70% { box-shadow: 0 0 0 7px rgba(229, 72, 77, 0); }
  100% { box-shadow: 0 0 0 0 rgba(229, 72, 77, 0); }
}
h1 {
  font-size: clamp(34px, 6.4vw, 58px);
  line-height: 1.04;
  letter-spacing: -0.03em;
  margin: 0 0 18px;
  font-weight: 720;
}
h1 .grad {
  background: linear-gradient(180deg, #fff, #d7b7b7);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lede {
  max-width: 620px;
  margin: 0 auto;
  color: var(--muted);
  font-size: clamp(16px, 2.4vw, 19px);
}

/* ---------- download ---------- */

.download {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  align-items: center;
  margin: 34px 0 12px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  padding: 15px 26px;
  border-radius: 13px;
  font-weight: 640;
  font-size: 16px;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.12s ease, box-shadow 0.2s ease, background 0.2s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: linear-gradient(180deg, var(--accent), var(--accent-deep));
  color: #fff;
  box-shadow: 0 12px 34px -12px rgba(198, 40, 40, 0.85), 0 1px 0 rgba(255,255,255,0.14) inset;
}
.btn-primary:hover { box-shadow: 0 16px 42px -12px rgba(198, 40, 40, 0.95); }
.btn-primary small { font-weight: 500; opacity: 0.86; font-size: 12.5px; }
.btn-primary .col { display: flex; flex-direction: column; align-items: flex-start; line-height: 1.15; }
.btn-ghost {
  background: var(--surface);
  border-color: var(--line);
  color: var(--text);
  font-size: 15px;
}
.btn-ghost:hover { background: var(--surface-2); }
.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  justify-content: center;
  color: var(--faint);
  font-size: 13.5px;
  margin-top: 6px;
}
.meta-row b { color: var(--muted); font-weight: 600; }

/* ---------- generic section ---------- */

section { padding: 40px 0; }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 30px; }
.section-head h2 {
  font-size: clamp(24px, 4vw, 32px);
  letter-spacing: -0.02em;
  margin: 0 0 10px;
  font-weight: 680;
}
.section-head p { color: var(--muted); margin: 0; }

/* ---------- feature grid ---------- */

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.card {
  background: linear-gradient(180deg, var(--surface), var(--bg-2));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}
.card .ic {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border-radius: 10px;
  background: rgba(229, 72, 77, 0.12);
  border: 1px solid rgba(229, 72, 77, 0.22);
  margin-bottom: 14px;
}
.card .ic svg { width: 20px; height: 20px; stroke: var(--accent); fill: none; stroke-width: 1.7; }
.card h3 { margin: 0 0 6px; font-size: 16.5px; letter-spacing: -0.01em; }
.card p { margin: 0; color: var(--muted); font-size: 14.5px; }

/* ---------- steps ---------- */

.steps { max-width: 680px; margin: 0 auto; display: flex; flex-direction: column; gap: 2px; }
.step {
  display: flex;
  gap: 16px;
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--line);
}
.step:first-child { border-radius: var(--radius) var(--radius) 0 0; }
.step:last-child { border-radius: 0 0 var(--radius) var(--radius); }
.step + .step { border-top: none; }
.step .n {
  flex: none;
  width: 30px; height: 30px;
  border-radius: 50%;
  display: grid; place-items: center;
  font-weight: 700; font-size: 14px;
  background: rgba(229, 72, 77, 0.14);
  color: var(--accent);
  border: 1px solid rgba(229, 72, 77, 0.3);
}
.step .b { min-width: 0; }
.step .b h4 { margin: 3px 0 3px; font-size: 15.5px; }
.step .b p { margin: 0; color: var(--muted); font-size: 14px; }
.step code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12.5px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1px 6px;
  color: #e7c7c7;
}

/* ---------- verify / callout ---------- */

.callout {
  background: linear-gradient(180deg, var(--surface), var(--bg-2));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 24px;
}
.callout.warn { border-color: rgba(208, 140, 38, 0.35); }
.callout h3 { margin: 0 0 8px; font-size: 17px; display: flex; align-items: center; gap: 9px; }
.callout p { margin: 0 0 10px; color: var(--muted); font-size: 14.5px; }
.callout p:last-child { margin-bottom: 0; }
.hash {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  word-break: break-all;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  color: #cfe8d8;
  user-select: all;
}

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

/* ---------- footer ---------- */

footer {
  border-top: 1px solid var(--line);
  margin-top: 30px;
  padding: 30px 0 50px;
  color: var(--faint);
  font-size: 13.5px;
}
footer .wrap { display: flex; flex-wrap: wrap; gap: 10px 22px; align-items: center; }
footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--text); }
footer .spacer { flex: 1; }

/* ---------- responsive ---------- */

@media (max-width: 760px) {
  .grid { grid-template-columns: 1fr; }
  .two-col { grid-template-columns: 1fr; }
  .nav .nav-link.hide-sm { display: none; }
}

/* ---------- donate ---------- */

.btn-donate {
  background: rgba(247, 147, 26, 0.12);
  border-color: rgba(247, 147, 26, 0.4);
  color: #f7931a;
  font-size: 15px;
}
.btn-donate:hover { background: rgba(247, 147, 26, 0.18); }
.btn-donate svg { display: block; }

#donate { padding-top: 8px; }
.donate-panel {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 26px;
  align-items: center;
  background:
    radial-gradient(420px 220px at 12% 10%, rgba(247, 147, 26, 0.10), transparent 70%),
    linear-gradient(180deg, var(--surface), var(--bg-2));
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 26px;
}
.donate-qr {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.donate-qr img {
  width: 188px; height: 188px;
  background: #fff;
  border-radius: 12px;
  padding: 12px;
  box-shadow: 0 10px 30px -12px rgba(0,0,0,0.7);
}
.donate-qr-badge {
  font-size: 12px;
  font-weight: 600;
  color: #f7931a;
  letter-spacing: 0.02em;
}
.eyebrow-btc {
  color: #f7931a;
  background: rgba(247, 147, 26, 0.10);
  border-color: rgba(247, 147, 26, 0.30);
  margin-bottom: 14px;
}
.donate-body h2 {
  font-size: clamp(22px, 3.4vw, 28px);
  letter-spacing: -0.02em;
  margin: 0 0 8px;
  font-weight: 680;
}
.donate-lede { color: var(--muted); margin: 0 0 18px; font-size: 15px; }
.addr-label {
  display: block;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--faint);
  margin-bottom: 7px;
}
.addr-row {
  display: flex;
  gap: 8px;
  align-items: stretch;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.addr {
  flex: 1;
  min-width: 220px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13.5px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px 13px;
  color: #f0d9b8;
  word-break: break-all;
  display: flex;
  align-items: center;
  user-select: all;
}
.copy-btn {
  flex: none;
  padding: 0 18px;
  border-radius: 10px;
  border: 1px solid rgba(247, 147, 26, 0.4);
  background: rgba(247, 147, 26, 0.12);
  color: #f7931a;
  font-weight: 640;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.copy-btn:hover { background: rgba(247, 147, 26, 0.2); }
.copy-btn.copied {
  background: rgba(63, 166, 106, 0.16);
  border-color: rgba(63, 166, 106, 0.5);
  color: var(--ok);
}
.donate-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.donate-actions .btn-primary {
  background: linear-gradient(180deg, #f7a233, #f7931a);
  box-shadow: 0 12px 30px -12px rgba(247, 147, 26, 0.85), 0 1px 0 rgba(255,255,255,0.18) inset;
}
.donate-actions .btn-primary:hover { box-shadow: 0 16px 40px -12px rgba(247, 147, 26, 0.95); }
.donate-actions .btn svg { display: block; }
.donate-hint { color: var(--faint); font-size: 13px; }

@media (max-width: 680px) {
  .donate-panel { grid-template-columns: 1fr; text-align: center; }
  .donate-qr { order: -1; }
  .addr-row, .donate-actions { justify-content: center; }
  .addr { min-width: 0; text-align: center; }
}

/* ---------- guarantees band ---------- */

#promise { padding-top: 26px; }
.promise-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.promise {
  background: linear-gradient(180deg, var(--surface), var(--bg-2));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 18px;
}
.promise .ic {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 11px;
  background: rgba(63, 166, 106, 0.12);
  border: 1px solid rgba(63, 166, 106, 0.26);
  margin-bottom: 13px;
}
.promise .ic svg { width: 21px; height: 21px; stroke: var(--ok); }
.promise h3 { margin: 0 0 6px; font-size: 15.5px; letter-spacing: -0.01em; }
.promise p { margin: 0; color: var(--muted); font-size: 13.5px; line-height: 1.55; }

/* ---------- how it's built ---------- */

.stack-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin: 0 0 26px;
}
.stack-chips span {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12.5px;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 13px;
}
.spec {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
}
.spec-row {
  display: grid;
  grid-template-columns: 210px 1fr;
  gap: 20px;
  padding: 18px 22px;
}
.spec-row + .spec-row { border-top: 1px solid var(--line); }
.spec-term {
  font-weight: 640;
  font-size: 14.5px;
  color: var(--text);
  letter-spacing: -0.01em;
}
.spec-def { color: var(--muted); font-size: 14.5px; }
.spec-def em { color: #e7c7c7; font-style: normal; }
.spec-def code, .spec-term code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12.5px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 5px;
  color: #e7c7c7;
}

.proto-title { text-align: center; margin: 34px 0 4px; font-size: 18px; letter-spacing: -0.01em; }
.proto-sub { text-align: center; color: var(--faint); font-size: 13.5px; margin: 0 0 16px; }
.table-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
table.proto { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 520px; }
table.proto th, table.proto td { text-align: left; padding: 11px 16px; }
table.proto thead th {
  background: var(--surface-2);
  color: var(--muted);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
table.proto tbody tr + tr { border-top: 1px solid var(--line); }
table.proto td { color: var(--muted); }
table.proto td code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12.5px;
  color: #e7c7c7;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 6px;
}

@media (max-width: 820px) {
  .promise-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 680px) {
  .promise-grid { grid-template-columns: 1fr; }
  .spec-row { grid-template-columns: 1fr; gap: 6px; }
}