/* constech.pro — engineering-minimal style. No external fonts, no frameworks. */

:root {
  --ink: #16222e;
  --ink-soft: #4a5a68;
  --bg: #f6f8f9;
  --panel: #ffffff;
  --line: #dde4e9;
  --accent: #0fa896;
  --accent-dark: #0b8577;
  --amber: #ffb454;
  --hero-bg: #0d1a26;
  --hero-ink: #dfe9f0;
  --mono: Consolas, "Cascadia Mono", Menlo, monospace;
  --sans: "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font: 16px/1.65 var(--sans);
  color: var(--ink);
  background: var(--bg);
}

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(13, 26, 38, .96);
  backdrop-filter: blur(6px);
  color: var(--hero-ink);
}
.nav {
  max-width: 1080px; margin: 0 auto; padding: 12px 20px;
  display: flex; align-items: center; gap: 26px; flex-wrap: wrap;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  color: #fff; text-decoration: none; font-weight: 700; letter-spacing: .02em;
}
.brand svg { display: block; }
.brand .dot { color: var(--accent); }
.nav-links { display: flex; gap: 20px; flex-wrap: wrap; margin-left: auto; }
.nav-links a {
  color: #b8c9d6; text-decoration: none; font-size: 15px;
  border-bottom: 2px solid transparent; padding-bottom: 2px;
  transition: color .2s, border-color .2s;
}
.nav-links a:hover, .nav-links a[aria-current] { color: #fff; border-color: var(--accent); }
.nav-cta {
  background: var(--accent); color: #06231f !important; font-weight: 600;
  padding: 6px 14px; border-radius: 5px; border-bottom: none !important;
}
.nav-cta:hover { background: #13c2ae; }

/* ---------- hero ---------- */
.hero {
  background:
    linear-gradient(rgba(13,26,38,.92), rgba(13,26,38,.97)),
    repeating-linear-gradient(0deg, transparent 0 39px, rgba(120,160,190,.08) 39px 40px),
    repeating-linear-gradient(90deg, transparent 0 39px, rgba(120,160,190,.08) 39px 40px),
    var(--hero-bg);
  color: var(--hero-ink);
  padding: 72px 20px 64px;
}
.hero-inner { max-width: 1080px; margin: 0 auto; }
.hero h1 {
  font-size: clamp(28px, 4.5vw, 46px); line-height: 1.15;
  margin: 0 0 18px; color: #fff; letter-spacing: -.01em; max-width: 720px;
}
.hero h1 em { color: var(--accent); font-style: normal; }
.hero p.lead { font-size: 19px; max-width: 640px; color: #b8c9d6; margin: 0 0 30px; }
.hero .actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* animated pulse line under hero heading */
.pulse-line { width: 100%; max-width: 720px; height: 46px; margin: 8px 0 2px; }
.pulse-line path {
  fill: none; stroke: var(--accent); stroke-width: 2;
  stroke-dasharray: 1200; stroke-dashoffset: 1200;
  animation: dash 6s linear infinite;
  filter: drop-shadow(0 0 4px rgba(15,168,150,.7));
}
@keyframes dash { to { stroke-dashoffset: 0; } }

/* ---------- buttons ---------- */
.btn {
  display: inline-block; text-decoration: none; font-weight: 600;
  padding: 11px 22px; border-radius: 6px; border: 1px solid transparent;
  transition: transform .15s, background .2s, border-color .2s;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #06231f; }
.btn-primary:hover { background: #13c2ae; }
.btn-ghost { border-color: #3d5468; color: var(--hero-ink); }
.btn-ghost:hover { border-color: var(--accent); color: #fff; }
.btn-dark { background: var(--ink); color: #fff; }
.btn-dark:hover { background: #24384a; }

/* ---------- layout ---------- */
.section { max-width: 1080px; margin: 0 auto; padding: 56px 20px; }
.section > h2 {
  font-size: clamp(22px, 3vw, 30px); margin: 0 0 8px; letter-spacing: -.01em;
}
.section > p.sub { color: var(--ink-soft); margin: 0 0 34px; max-width: 640px; }
.kicker {
  font-family: var(--mono); font-size: 13px; color: var(--accent-dark);
  text-transform: uppercase; letter-spacing: .12em; margin: 0 0 6px;
}

/* ---------- cards ---------- */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 24px 22px; position: relative; overflow: hidden;
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 10px 24px rgba(22,34,46,.09); border-color: #bfe6df; }
.card h3 { margin: 10px 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--ink-soft); font-size: 15px; }
.card .icon {
  width: 42px; height: 42px; border-radius: 9px; display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(15,168,150,.14), rgba(15,168,150,.05));
  color: var(--accent-dark);
}
.card a.more { color: var(--accent-dark); font-weight: 600; text-decoration: none; font-size: 14px; }
.card a.more:hover { text-decoration: underline; }

/* offer cards gentle float on the home page */
.float .card { animation: bob 7s ease-in-out infinite; }
.float .card:nth-child(2) { animation-delay: 1.2s; }
.float .card:nth-child(3) { animation-delay: 2.4s; }
.float .card:nth-child(4) { animation-delay: 3.6s; }
@keyframes bob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-5px); } }
.float .card:hover { animation-play-state: paused; transform: translateY(-3px); }

/* ---------- how-we-work steps ---------- */
.steps { counter-reset: step; display: grid; gap: 14px; }
.step {
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 18px 20px 18px 66px; position: relative;
}
.step::before {
  counter-increment: step; content: counter(step, decimal-leading-zero);
  position: absolute; left: 18px; top: 16px;
  font-family: var(--mono); font-size: 20px; color: var(--accent-dark); font-weight: 700;
}
.step h3 { margin: 0 0 4px; font-size: 16px; }
.step p { margin: 0; color: var(--ink-soft); font-size: 15px; }

/* ---------- forms ---------- */
form.public {
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 26px 24px; max-width: 640px;
}
form.public label { display: block; font-weight: 600; font-size: 14px; margin: 16px 0 6px; }
form.public label:first-child { margin-top: 0; }
form.public .req::after { content: " *"; color: #c0392b; }
form.public input[type=text], form.public input[type=email],
form.public select, form.public textarea {
  width: 100%; font: inherit; padding: 10px 12px;
  border: 1px solid #c3ccd4; border-radius: 6px; background: #fcfdfe;
}
form.public textarea { min-height: 120px; resize: vertical; }
form.public input:focus, form.public textarea:focus, form.public select:focus {
  outline: 2px solid rgba(15,168,150,.35); border-color: var(--accent);
}
form.public button { margin-top: 22px; }
form.public .hint { font-size: 13px; color: var(--ink-soft); margin-top: 6px; }
/* honeypot: invisible to humans */
.hp-field { position: absolute; left: -6000px; width: 1px; height: 1px; overflow: hidden; }

/* ---------- donate ---------- */
.wallet-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 18px; }
.wallet-card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 22px; text-align: center;
}
.wallet-card .qr { max-width: 180px; width: 100%; border: 1px solid var(--line); border-radius: 6px; }
.wallet-card h3 { margin: 12px 0 8px; }
.wallet-card .addr {
  font-family: var(--mono); font-size: 12px; word-break: break-all;
  background: #f0f3f6; padding: 8px; border-radius: 5px; display: block;
}

/* ---------- invoice ---------- */
.badge-status {
  display: inline-block; vertical-align: middle; margin-left: 10px;
  padding: 3px 14px; border-radius: 14px; font-size: 14px; font-weight: 700;
  letter-spacing: .06em; text-transform: uppercase;
}
.badge-status.unpaid { background: #fff3d6; color: #8a6100; }
.badge-status.paid { background: #d2f2df; color: #14683c; }
.badge-status.cancelled { background: #eee; color: #666; text-decoration: line-through; }

/* ---------- misc ---------- */
.notice {
  border-left: 4px solid var(--amber); background: #fff9ee;
  padding: 14px 18px; border-radius: 0 8px 8px 0; margin: 26px 0; font-size: 15px;
}
.ethics li { margin-bottom: 8px; }
.muted { color: var(--ink-soft); }
.two-col { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 28px; }
code.inline { font-family: var(--mono); background: #eef2f5; padding: 1px 6px; border-radius: 4px; font-size: 14px; }

/* scroll reveal (JS adds .js to <html>; without JS everything stays visible) */
html.js .reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s, transform .6s; }
html.js .reveal.in { opacity: 1; transform: none; }

/* ---------- footer ---------- */
.site-footer {
  background: var(--hero-bg); color: #8fa5b5; margin-top: 60px;
  padding: 40px 20px 30px; font-size: 14px;
}
.footer-inner { max-width: 1080px; margin: 0 auto; display: grid; gap: 8px; }
.site-footer a { color: #b8c9d6; text-decoration: none; }
.site-footer a:hover { color: #fff; }
.footer-note { border-top: 1px solid #22364a; padding-top: 14px; margin-top: 10px; }

@media (max-width: 640px) {
  .nav { gap: 12px; }
  .nav-links { gap: 12px; font-size: 14px; }
  .hero { padding: 48px 16px 40px; }
}
@media (prefers-reduced-motion: reduce) {
  .pulse-line path, .float .card { animation: none; }
  html.js .reveal { opacity: 1; transform: none; transition: none; }
}