/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --clr-bg: #0f172a;
  --clr-surface: #1e293b;
  --clr-card: #334155;
  --clr-accent: #22d3ee;
  --clr-accent2: #a78bfa;
  --clr-green: #4ade80;
  --clr-yellow: #facc15;
  --clr-text: #e2e8f0;
  --clr-muted: #94a3b8;
  --radius: 12px;
  --max-w: 1100px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.7;
}

a { color: var(--clr-accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--clr-accent2); }

img { max-width: 100%; display: block; }

/* ===== Navigation ===== */
.site-nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(15,23,42,.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,.06);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .75rem 1.5rem;
}

.nav-logo {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--clr-accent);
  display: flex; align-items: center; gap: .5rem;
}
.nav-logo span { font-size: 1.4rem; }

.nav-links { display: flex; gap: .25rem; list-style: none; flex-wrap: wrap; }
.nav-links a {
  padding: .4rem .75rem;
  border-radius: 8px;
  font-size: .88rem;
  color: var(--clr-muted);
  transition: background .2s, color .2s;
}
.nav-links a:hover,
.nav-links a.active {
  background: rgba(34,211,238,.1);
  color: var(--clr-accent);
}

/* Hamburger */
.nav-toggle { display: none; background: none; border: none; color: var(--clr-text); font-size: 1.5rem; cursor: pointer; }

@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none; flex-direction: column;
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--clr-surface);
    padding: 1rem;
    border-bottom: 1px solid rgba(255,255,255,.06);
  }
  .nav-links.open { display: flex; }
}

/* ===== Hero ===== */
.hero {
  text-align: center;
  padding: 4rem 1.5rem 3rem;
  background: linear-gradient(180deg, rgba(34,211,238,.06) 0%, transparent 60%);
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: .75rem;
}
.hero h1 .accent { color: var(--clr-accent); }
.hero h1 .accent2 { color: var(--clr-accent2); }
.hero p { max-width: 640px; margin: 0 auto 2rem; color: var(--clr-muted); font-size: 1.1rem; }

/* ===== Page Header (non-home) ===== */
.page-header {
  text-align: center;
  padding: 3.5rem 1.5rem 2rem;
  background: linear-gradient(180deg, rgba(167,139,250,.06) 0%, transparent 60%);
}
.page-header h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 800; margin-bottom: .5rem; }
.page-header p { color: var(--clr-muted); max-width: 600px; margin: 0 auto; }

/* ===== Container ===== */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 1.5rem; }

/* ===== Section ===== */
.section { padding: 3rem 0; }
.section-title {
  font-size: 1.6rem; font-weight: 700; margin-bottom: 1.5rem;
  display: flex; align-items: center; gap: .5rem;
}
.section-title .icon { font-size: 1.4rem; }

/* ===== Cards Grid ===== */
.cards { display: grid; gap: 1.25rem; }
.cards-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.cards-3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

.card {
  background: var(--clr-surface);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: transform .2s, border-color .2s;
}
.card:hover { transform: translateY(-3px); border-color: rgba(34,211,238,.25); }
.card .card-icon { font-size: 2rem; margin-bottom: .75rem; }
.card h3 { font-size: 1.1rem; margin-bottom: .5rem; }
.card p { color: var(--clr-muted); font-size: .92rem; }

/* ===== Video Embed ===== */
.video-wrap {
  max-width: 360px;
  margin: 0 auto 2rem;
  border-radius: var(--radius);
  overflow: hidden;
  border: 2px solid rgba(34,211,238,.2);
  aspect-ratio: 9/16;
}
.video-wrap iframe { width: 100%; height: 100%; border: none; }

/* ===== Code Block ===== */
.code-block {
  background: #0d1117;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius);
  padding: 1.25rem;
  overflow-x: auto;
  font-family: 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  font-size: .85rem;
  line-height: 1.6;
  color: #c9d1d9;
  margin-bottom: 1.5rem;
}
.code-block .kw { color: #ff7b72; }
.code-block .str { color: #a5d6ff; }
.code-block .cm { color: #8b949e; }
.code-block .fn { color: #d2a8ff; }
.code-block .num { color: #79c0ff; }

/* ===== Morse Table ===== */
.morse-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  font-size: .92rem;
}
.morse-table th {
  background: var(--clr-card);
  padding: .6rem 1rem;
  text-align: left;
  font-weight: 600;
}
.morse-table td {
  padding: .5rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.morse-table tr:hover td { background: rgba(34,211,238,.04); }
.morse-code-cell { font-family: monospace; font-size: 1.05rem; letter-spacing: 2px; color: var(--clr-yellow); }

/* ===== Info Box ===== */
.info-box {
  background: rgba(34,211,238,.06);
  border-left: 3px solid var(--clr-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
}
.info-box.purple { background: rgba(167,139,250,.06); border-left-color: var(--clr-accent2); }
.info-box.green  { background: rgba(74,222,128,.06);  border-left-color: var(--clr-green); }

/* ===== Timeline ===== */
.timeline { position: relative; padding-left: 2rem; margin-bottom: 2rem; }
.timeline::before {
  content: ''; position: absolute; left: .5rem; top: 0; bottom: 0;
  width: 2px; background: var(--clr-card);
}
.timeline-item { position: relative; margin-bottom: 1.75rem; }
.timeline-item::before {
  content: ''; position: absolute; left: -1.75rem; top: .35rem;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--clr-accent); border: 2px solid var(--clr-bg);
}
.timeline-item h3 { font-size: 1.05rem; margin-bottom: .25rem; }
.timeline-item p { color: var(--clr-muted); font-size: .92rem; }

/* ===== Controls Table ===== */
.controls-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
}
.controls-table th {
  background: var(--clr-card);
  padding: .6rem 1rem;
  text-align: left;
}
.controls-table td {
  padding: .5rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.controls-table code {
  background: rgba(34,211,238,.1);
  padding: .15rem .4rem;
  border-radius: 4px;
  font-size: .88rem;
}

/* ===== Badge ===== */
.badge {
  display: inline-block;
  padding: .2rem .6rem;
  border-radius: 6px;
  font-size: .78rem;
  font-weight: 600;
}
.badge-cyan   { background: rgba(34,211,238,.15); color: var(--clr-accent); }
.badge-purple { background: rgba(167,139,250,.15); color: var(--clr-accent2); }
.badge-green  { background: rgba(74,222,128,.15);  color: var(--clr-green); }
.badge-yellow { background: rgba(250,204,21,.15);  color: var(--clr-yellow); }

/* ===== CTA Button ===== */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .7rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: .95rem;
  transition: transform .15s, box-shadow .2s;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--clr-accent), #06b6d4);
  color: var(--clr-bg);
  box-shadow: 0 4px 20px rgba(34,211,238,.25);
}
.btn-outline {
  border: 1px solid var(--clr-accent);
  color: var(--clr-accent);
}

/* ===== Footer ===== */
.site-footer {
  text-align: center;
  padding: 2rem 1.5rem;
  border-top: 1px solid rgba(255,255,255,.06);
  color: var(--clr-muted);
  font-size: .85rem;
  margin-top: 3rem;
}