/* P4-Cache — dark technical theme */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #0d0d12;
  --surface:   #14141c;
  --border:    #22222e;
  --muted:     #5a5a7a;
  --text:      #e8e8f0;
  --accent:    #00d4ff;
  --accent2:   #7b5cf5;
  --green:     #00e87a;
  --font:      -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Navigation ────────────────────────────────── */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 40px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(13,13,18,0.9);
  backdrop-filter: blur(8px);
  z-index: 100;
}
nav .logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.5px;
}
nav .logo span { color: var(--text); }
nav ul { display: flex; gap: 32px; list-style: none; }
nav ul a { color: var(--muted); text-decoration: none; font-size: 0.875rem; transition: color 0.2s; }
nav ul a:hover { color: var(--text); }
nav .cta-nav {
  background: var(--accent);
  color: #000;
  padding: 8px 20px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  transition: opacity 0.2s;
}
nav .cta-nav:hover { opacity: 0.85; }

/* ── Hero ──────────────────────────────────────── */
.hero {
  text-align: center;
  padding: 100px 40px 80px;
  max-width: 760px;
  margin: 0 auto;
}
.hero .eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
}
.hero h1 em { font-style: normal; color: var(--accent); }
.hero .sub {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.7;
}
.hero .hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  background: var(--accent);
  color: #000;
  padding: 14px 32px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  transition: opacity 0.2s;
  display: inline-block;
}
.btn-primary:hover { opacity: 0.85; }
.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text);
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 0.95rem;
  text-decoration: none;
  transition: border-color 0.2s;
  display: inline-block;
}
.btn-ghost:hover { border-color: var(--muted); }

/* ── Stats bar ─────────────────────────────────── */
.stats-bar {
  display: flex;
  justify-content: center;
  gap: 64px;
  padding: 48px 40px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.stat { text-align: center; }
.stat .value { font-size: 2.2rem; font-weight: 800; color: var(--accent); }
.stat .label { font-size: 0.8rem; color: var(--muted); margin-top: 4px; letter-spacing: 0.05em; text-transform: uppercase; }

/* ── Features ──────────────────────────────────── */
.features { padding: 80px 40px; max-width: 960px; margin: 0 auto; }
.features .section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent2);
  margin-bottom: 12px;
  text-align: center;
}
.features h2 { font-size: 2rem; font-weight: 800; text-align: center; margin-bottom: 56px; letter-spacing: -0.5px; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  transition: border-color 0.2s;
}
.card:hover { border-color: var(--muted); }
.card .icon {
  width: 40px; height: 40px;
  background: rgba(0,212,255,0.1);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  margin-bottom: 20px;
}
.card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 0.875rem; line-height: 1.65; }
.card .tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
  margin-top: 14px;
  letter-spacing: 0.04em;
}
.tag-green { background: rgba(0,232,122,0.12); color: var(--green); }
.tag-blue { background: rgba(0,212,255,0.12); color: var(--accent); }
.tag-purple { background: rgba(123,92,245,0.12); color: var(--accent2); }

/* ── Architecture diagram ───────────────────────── */
.architecture { padding: 80px 40px; background: var(--surface); border-top: 1px solid var(--border); }
.architecture-inner { max-width: 900px; margin: 0 auto; }
.architecture .section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
  text-align: center;
}
.architecture h2 { font-size: 2rem; font-weight: 800; text-align: center; margin-bottom: 12px; letter-spacing: -0.5px; }
.architecture > .architecture-inner > p { text-align: center; color: var(--muted); margin-bottom: 48px; }
.diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}
.layer {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px 20px;
  text-align: center;
  min-width: 180px;
}
.layer h4 { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 16px; }
.layer.hot h4 { color: var(--green); }
.layer.warm h4 { color: var(--accent); }
.layer.cold h4 { color: var(--accent2); }
.layer ul { list-style: none; font-size: 0.8rem; color: var(--muted); line-height: 2; }
.arrow {
  font-size: 1.6rem;
  color: var(--muted);
  padding: 0 12px;
  flex-shrink: 0;
}

/* ── CTA band ─────────────────────────────────── */
.cta-band {
  padding: 80px 40px;
  text-align: center;
  border-top: 1px solid var(--border);
}
.cta-band h2 { font-size: 2rem; font-weight: 800; margin-bottom: 16px; letter-spacing: -0.5px; }
.cta-band p { color: var(--muted); max-width: 480px; margin: 0 auto 36px; }
.cta-band .cta-sub {
  margin-top: 20px;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ── Footer ───────────────────────────────────── */
footer {
  margin-top: auto;
  padding: 32px 40px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
footer .brand { font-size: 0.9rem; font-weight: 700; color: var(--accent); }
footer .copy { font-size: 0.78rem; color: var(--muted); }
footer a { color: var(--muted); text-decoration: none; font-size: 0.78rem; transition: color 0.2s; }
footer a:hover { color: var(--text); }
footer ul { display: flex; gap: 24px; list-style: none; }

/* ── Responsive ────────────────────────────────── */
@media (max-width: 640px) {
  nav { padding: 16px 20px; }
  nav ul { display: none; }
  .hero { padding: 60px 20px 50px; }
  .stats-bar { gap: 32px; padding: 32px 20px; }
  .features { padding: 60px 20px; }
  .architecture { padding: 60px 20px; }
  .diagram { flex-direction: column; }
  .arrow { transform: rotate(90deg); padding: 8px 0; }
  .cta-band { padding: 60px 20px; }
  footer { padding: 24px 20px; flex-direction: column; text-align: center; }
}