/* ============================================================
   PowerHash (PWDH) — style.css
   Dark theme, no external resources, system font stack.
   ============================================================ */

:root {
  --bg: #0b0e13;
  --bg-elev: #11161f;
  --bg-card: #141a24;
  --border: #232c3a;
  --text: #e6eaf0;
  --text-dim: #9aa7b8;
  --accent: #ffb02e;
  --accent-2: #ff6a00;
  --accent-soft: rgba(255, 176, 46, 0.12);
  --code-bg: #0d1219;
  --ok: #3fb950;
  --radius: 12px;
  --maxw: 1120px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Layout helpers ---------- */

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

section { padding: 72px 0; }

.section-title {
  font-size: 1.9rem;
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}

.section-sub {
  color: var(--text-dim);
  margin: 0 0 40px;
  max-width: 640px;
}

/* ---------- Header / Nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 14, 19, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
}

.brand img { width: 28px; height: 28px; display: block; }

.brand .ticker {
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1px 7px;
  background: var(--accent-soft);
}

.nav { display: flex; gap: 26px; align-items: center; }

.nav a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.15s ease;
}

.nav a:hover, .nav a:focus-visible { color: var(--accent); }

.nav a[aria-current="page"] { color: var(--accent); font-weight: 600; }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 1.2rem;
  padding: 4px 12px;
  cursor: pointer;
}

/* ---------- Hero ---------- */

.hero {
  padding: 110px 0 90px;
  text-align: center;
  background:
    radial-gradient(ellipse 60% 50% at 50% -10%, rgba(255, 106, 0, 0.14), transparent),
    var(--bg);
}

.hero-logo { width: 84px; height: 84px; margin-bottom: 20px; }

.hero h1 {
  font-size: clamp(2.4rem, 5.5vw, 3.6rem);
  margin: 0 0 14px;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.hero h1 .grad {
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tagline {
  font-size: 1.25rem;
  color: var(--text-dim);
  max-width: 620px;
  margin: 0 auto 36px;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 16px;
  margin-bottom: 28px;
  background: var(--bg-elev);
}

.status-pill .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 8px var(--ok);
}

.cta-row {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 13px 30px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
}

.btn-primary {
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  color: #14100a;
}

.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(255, 122, 0, 0.35); }

.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--bg-elev);
}

.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Feature grid ---------- */

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.card:hover { border-color: var(--accent); transform: translateY(-3px); }

.card .icon {
  font-size: 1.5rem;
  width: 46px; height: 46px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 10px;
  background: var(--accent-soft);
  margin-bottom: 16px;
}

.card h3 { margin: 0 0 8px; font-size: 1.1rem; }

.card p { margin: 0; color: var(--text-dim); font-size: 0.95rem; }

/* ---------- Tables ---------- */

.table-scroll { overflow-x: auto; }

table.specs {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 0.95rem;
}

table.specs th, table.specs td {
  text-align: left;
  padding: 12px 18px;
  border-bottom: 1px solid var(--border);
}

table.specs thead th {
  background: var(--bg-elev);
  color: var(--accent);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

table.specs tbody tr:last-child td { border-bottom: none; }

table.specs td:first-child { color: var(--text-dim); white-space: nowrap; }

table.specs td code, table.specs th code { white-space: nowrap; }

/* ---------- Code blocks ---------- */

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.88rem;
  line-height: 1.6;
  color: #d7e0ea;
}

pre .c { color: #6b7a8f; } /* comments */

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 6px;
}

pre code { background: none; border: none; padding: 0; }

/* ---------- Steps / Getting started ---------- */

.steps {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.step h3 {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.05rem;
  margin: 0 0 10px;
}

.step .num {
  flex: none;
  width: 30px; height: 30px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.step p { color: var(--text-dim); margin: 0 0 12px; font-size: 0.95rem; }

/* ---------- Roadmap ---------- */

.roadmap {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.roadmap::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--border);
}

.roadmap li {
  position: relative;
  padding: 0 0 32px 52px;
}

.roadmap li:last-child { padding-bottom: 0; }

.roadmap .marker {
  position: absolute;
  left: 6px;
  top: 4px;
  width: 20px; height: 20px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: var(--bg);
}

.roadmap li.done .marker {
  border-color: var(--ok);
  background: var(--ok);
  box-shadow: 0 0 10px rgba(63, 185, 80, 0.5);
}

.roadmap li.active .marker {
  border-color: var(--accent);
  background: var(--accent);
  box-shadow: 0 0 10px rgba(255, 176, 46, 0.5);
}

.roadmap h3 {
  margin: 0 0 4px;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.roadmap .badge {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px 9px;
  border-radius: 999px;
}

.badge.done { background: rgba(63, 185, 80, 0.15); color: var(--ok); }
.badge.active { background: var(--accent-soft); color: var(--accent); }
.badge.planned { background: var(--bg-elev); color: var(--text-dim); border: 1px solid var(--border); }

.roadmap p { margin: 0; color: var(--text-dim); font-size: 0.95rem; max-width: 640px; }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-elev);
  padding: 48px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}

.site-footer h4 {
  margin: 0 0 12px;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.site-footer ul { list-style: none; margin: 0; padding: 0; }

.site-footer li { margin-bottom: 8px; }

.site-footer a { color: var(--text-dim); text-decoration: none; font-size: 0.95rem; }

.site-footer a:hover { color: var(--accent); }

.footer-brand p { color: var(--text-dim); font-size: 0.9rem; max-width: 360px; margin: 10px 0 0; }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  color: var(--text-dim);
  font-size: 0.85rem;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

/* ---------- Whitepaper ---------- */

.wp-hero {
  padding: 80px 0 48px;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(ellipse 60% 50% at 50% -20%, rgba(255, 106, 0, 0.1), transparent),
    var(--bg);
}

.wp-hero h1 { font-size: clamp(2rem, 4.5vw, 2.8rem); margin: 0 0 10px; letter-spacing: -0.02em; }

.wp-meta { color: var(--text-dim); font-size: 0.95rem; margin: 0; }

.wp-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 56px;
  padding: 56px 0 80px;
}

.wp-toc {
  position: sticky;
  top: 96px;
  align-self: start;
  font-size: 0.9rem;
}

.wp-toc strong {
  display: block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.wp-toc ol { margin: 0; padding-left: 20px; }

.wp-toc li { margin-bottom: 6px; }

.wp-toc a { color: var(--text-dim); text-decoration: none; }

.wp-toc a:hover { color: var(--accent); }

.wp-body { max-width: 760px; }

.wp-body h2 {
  font-size: 1.5rem;
  margin: 56px 0 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  letter-spacing: -0.01em;
}

.wp-body h2:first-child { margin-top: 0; border-top: none; padding-top: 0; }

.wp-body h3 { font-size: 1.12rem; margin: 28px 0 10px; }

.wp-body p { color: #c4cdd9; }

.wp-body ul, .wp-body ol { color: #c4cdd9; padding-left: 24px; }

.wp-body li { margin-bottom: 6px; }

.abstract {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 20px 24px;
  margin-bottom: 8px;
}

.abstract p { margin: 0; font-style: italic; }

.callout {
  background: var(--accent-soft);
  border: 1px solid rgba(255, 176, 46, 0.3);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 20px 0;
  font-size: 0.95rem;
}

.callout p { margin: 0; color: var(--text); }

.callout strong { color: var(--accent); }

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .wp-layout { grid-template-columns: 1fr; gap: 32px; }
  .wp-toc { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  section { padding: 52px 0; }
  .grid, .steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }

  .nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0; right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--bg-elev);
    border-bottom: 1px solid var(--border);
    padding: 8px 24px 16px;
  }

  .nav.open { display: flex; }
  .nav a { padding: 10px 0; width: 100%; }
  .nav-toggle { display: block; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

/* PWDH acronym note under the hero tagline */
.acronym {
  margin: .85rem auto 0;
  max-width: 46rem;
  padding: .55rem 1rem;
  border-left: 3px solid var(--accent, #ffb02e);
  background: rgba(255, 176, 46, .07);
  border-radius: 0 .5rem .5rem 0;
  font-size: .95rem;
  color: var(--muted, #b9c0cc);
}
.acronym strong { color: var(--accent, #ffb02e); }