@import url("https://fonts.googleapis.com/css2?family=Geist:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap");

:root {
  --bg: #0d1117;
  --surface: #161b22;
  --surface-raised: #1c2128;
  --border: #30363d;
  --text: #f0f6fc;
  --muted: #8b949e;
  --green: #3fb950;
  --green-dark: #238636;
  --amber: #d29922;
  --cyan: #58a6ff;
}

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

body {
  min-height: 100vh;
  background: var(--bg);
  background-image: linear-gradient(rgba(13, 17, 23, .9), rgba(13, 17, 23, .96)), url("cyber_bg.jpg");
  background-position: center top;
  background-size: cover;
  background-attachment: fixed;
  color: var(--text);
  font-family: Geist, -apple-system, BlinkMacSystemFont, sans-serif;
}

a { color: inherit; text-decoration: none; }

.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(13, 17, 23, .88);
  backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.navbar, .page { width: min(1160px, calc(100% - 48px)); margin: 0 auto; }
.navbar { min-height: 72px; display: flex; align-items: center; gap: 36px; }
.brand { font-size: 1.15rem; font-weight: 700; letter-spacing: -.03em; white-space: nowrap; }
.brand span, .accent { color: var(--green); }
.nav-links { display: flex; gap: 6px; margin-right: auto; }
.nav-links a, .account a { color: var(--muted); font-size: .9rem; padding: 9px 11px; border-radius: 6px; }
.nav-links a:hover, .nav-links .active { background: var(--surface-raised); color: var(--text); }
.account { display: flex; align-items: center; gap: 7px; }
.account .signup { background: var(--green-dark); color: var(--text); }
.account .signup:hover { background: var(--green); }
.user-label { color: var(--muted); font: 500 .72rem JetBrains Mono, monospace; }

.hero { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(300px, .85fr); gap: 70px; align-items: center; padding: 92px 0 84px; }
.eyebrow { color: var(--green); font: 500 .72rem JetBrains Mono, monospace; letter-spacing: .12em; text-transform: uppercase; margin-bottom: 20px; }
h1 { max-width: 700px; font-size: clamp(2.6rem, 6vw, 4.9rem); line-height: 1.02; letter-spacing: -.06em; }
.hero-copy > p { max-width: 600px; color: var(--muted); font-size: 1.1rem; line-height: 1.7; margin: 25px 0 30px; }
.actions { display: flex; gap: 12px; flex-wrap: wrap; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 17px; border: 1px solid var(--green-dark); border-radius: 6px; background: var(--green-dark); font-weight: 600; font-size: .9rem; }
.button:hover { background: var(--green); border-color: var(--green); }
.button.outline { border-color: var(--border); background: var(--surface); color: var(--text); }
.button.outline:hover { border-color: var(--muted); background: var(--surface-raised); }

.command-panel { border: 1px solid var(--border); border-radius: 8px; background: rgba(22, 27, 34, .9); box-shadow: 0 20px 60px rgba(0, 0, 0, .25); overflow: hidden; }
.panel-top { display: flex; gap: 7px; border-bottom: 1px solid var(--border); padding: 14px 16px; }
.panel-top i { width: 9px; height: 9px; border-radius: 50%; background: var(--border); }
.panel-top i:first-child { background: #f85149; }
.panel-top i:nth-child(2) { background: var(--amber); }
.panel-top i:nth-child(3) { background: var(--green); }
.terminal { padding: 25px; font: .82rem/2 JetBrains Mono, monospace; color: var(--muted); }
.terminal strong { color: var(--green); font-weight: 500; }
.terminal .bright { color: var(--text); }
.signal { margin: 20px 0 4px; height: 5px; border-radius: 5px; background: var(--border); overflow: hidden; }
.signal span { display: block; width: 68%; height: 100%; background: var(--green); }

.section { padding: 38px 0 78px; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; border-bottom: 1px solid var(--border); padding-bottom: 16px; margin-bottom: 22px; }
.section-heading h2 { font-size: 1.45rem; letter-spacing: -.03em; }
.section-heading p { color: var(--muted); font-size: .86rem; }
.resource-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.resource { min-height: 245px; display: flex; flex-direction: column; padding: 23px; border: 1px solid var(--border); border-radius: 8px; background: rgba(22, 27, 34, .93); transition: border-color .2s, transform .2s; }
.resource:hover { border-color: var(--green); transform: translateY(-3px); }
.resource-mark { color: var(--green); font: 500 .72rem JetBrains Mono, monospace; letter-spacing: .08em; }
.resource h3 { margin: 17px 0 9px; font-size: 1.15rem; }
.resource p { color: var(--muted); font-size: .92rem; line-height: 1.65; }
.resource .button { margin-top: auto; align-self: flex-start; min-height: 38px; padding: 0 13px; font-size: .8rem; }

.learning-band { display: grid; grid-template-columns: .8fr 1.2fr; gap: 45px; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: 55px 0; }
.learning-band h2 { font-size: 2rem; letter-spacing: -.04em; }
.learning-band > div > p { color: var(--muted); line-height: 1.7; margin-top: 14px; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.step { border-left: 2px solid var(--green-dark); padding-left: 16px; }
.step b { color: var(--green); font: 500 .75rem JetBrains Mono, monospace; }
.step h3 { font-size: 1rem; margin: 13px 0 7px; }
.step p { color: var(--muted); font-size: .87rem; line-height: 1.6; }

.site-footer { color: var(--muted); font: .75rem JetBrains Mono, monospace; padding: 28px 0 35px; }

@media (max-width: 760px) {
  .navbar, .page { width: min(100% - 32px, 600px); }
  .navbar { min-height: 64px; gap: 12px; flex-wrap: wrap; padding: 10px 0; }
  .nav-links { order: 3; width: 100%; overflow-x: auto; }
  .nav-links a { white-space: nowrap; }
  .account { margin-left: auto; }
  .user-label { display: none; }
  .hero { grid-template-columns: 1fr; gap: 36px; padding: 60px 0 58px; }
  h1 { font-size: clamp(2.55rem, 13vw, 4rem); }
  .resource-grid, .learning-band, .steps { grid-template-columns: 1fr; }
  .learning-band { gap: 30px; }
  .section-heading { align-items: start; flex-direction: column; gap: 8px; }
}