@import url('https://fonts.googleapis.com/css2?family=Exo+2:wght@300;500;700;900&family=JetBrains+Mono:wght@300;400&display=swap');

/* ─── Variables ───────────────────────────────────────────── */
:root {
  --void:        #04060f;
  --deep:        #080d1c;
  --panel:       #0d1528;
  --panel-edge:  #1a2544;
  --plasma:      #00d4ff;
  --plasma-dim:  #0090b3;
  --plasma-glow: rgba(0,212,255,.18);
  --amber:       #f59e0b;
  --amber-dim:   rgba(245,158,11,.15);
  --violet:      #a855f7;
  --violet-glow: rgba(168,85,247,.20);
  --text:        #cdd9f0;
  --text-muted:  #566a8f;
  --text-bright: #e8f2ff;
  --radius:      14px;
  --font-ui:     'Exo 2', sans-serif;
  --font-mono:   'JetBrains Mono', monospace;
}

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

/* ─── Body & scanline overlay ─────────────────────────────── */
body {
  font-family: var(--font-ui);
  background: var(--void);
  color: var(--text);
  line-height: 1.72;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Subtle scanlines */
body::before {
  content: '';
  position: fixed; inset: 0;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0px,
    transparent 3px,
    rgba(0,0,0,.10) 3px,
    rgba(0,0,0,.10) 4px
  );
  pointer-events: none;
  z-index: 200;
}

/* ─── Animated grid floor ─────────────────────────────────── */
body::after {
  content: '';
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: 220px;
  background:
    linear-gradient(to bottom, transparent 0%, rgba(0,212,255,.04) 100%),
    repeating-linear-gradient(90deg, transparent, transparent 59px, rgba(0,212,255,.07) 60px),
    repeating-linear-gradient(0deg,  transparent, transparent 59px, rgba(0,212,255,.07) 60px);
  animation: gridScroll 4s linear infinite;
  pointer-events: none;
  z-index: 0;
}
@keyframes gridScroll { to { background-position: 0 60px; } }

/* ─── Wrap ────────────────────────────────────────────────── */
.wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 22px 80px;
  position: relative;
  z-index: 1;
}

/* ─── Header ──────────────────────────────────────────────── */
header {
  background: linear-gradient(135deg, var(--deep), var(--panel));
  border-bottom: 2px solid var(--plasma-dim);
  position: relative;
  overflow: hidden;
}

/* Plasma beam top */
header::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--plasma), var(--violet), transparent);
  animation: beam 3s ease-in-out infinite alternate;
}
@keyframes beam { from { opacity: .4; } to { opacity: 1; } }

/* Corner bracket */
header::after {
  content: '◈';
  position: absolute;
  top: 50%; right: 32px;
  transform: translateY(-50%);
  font-size: 4rem;
  color: var(--plasma);
  opacity: .07;
  animation: spin 12s linear infinite;
}
@keyframes spin { to { transform: translateY(-50%) rotate(360deg); } }

h1 {
  font-weight: 900;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  color: #fff;
  letter-spacing: 2px;
  text-transform: uppercase;
  text-shadow: 0 0 24px var(--plasma), 0 0 60px rgba(0,212,255,.3);
}

.sub {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: .82rem;
  margin-top: 8px;
  letter-spacing: .5px;
}

/* ─── Cards ───────────────────────────────────────────────── */
.card {
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: var(--radius);
  padding: 26px 28px;
  margin-top: 18px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0,0,0,.4), inset 0 1px 0 rgba(255,255,255,.03);
  opacity: 0;
  animation: cardIn .55s cubic-bezier(.22,1,.36,1) forwards;
  transition: border-color .3s, box-shadow .3s;
}

.card:hover {
  border-color: var(--plasma-dim);
  box-shadow: 0 8px 32px rgba(0,0,0,.4), 0 0 0 1px var(--plasma-dim), inset 0 0 40px var(--plasma-glow);
}

/* Left accent bar */
.card::before {
  content: '';
  position: absolute;
  top: 16px; bottom: 16px; left: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--plasma), var(--violet));
  border-radius: 0 3px 3px 0;
  opacity: 0;
  transition: opacity .3s;
}
.card:hover::before { opacity: 1; }

/* Staggered entrance */
.card:nth-child(1) { animation-delay: .08s; }
.card:nth-child(2) { animation-delay: .16s; }
.card:nth-child(3) { animation-delay: .24s; }
.card:nth-child(4) { animation-delay: .32s; }
.card:nth-child(5) { animation-delay: .40s; }

@keyframes cardIn {
  from { opacity: 0; transform: translateY(18px) scale(.98); }
  to   { opacity: 1; transform: translateY(0)  scale(1); }
}

/* ─── Card icon chip ──────────────────────────────────────── */
.card-icon {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--plasma);
  letter-spacing: 1px;
  text-transform: uppercase;
  background: rgba(0,212,255,.08);
  border: 1px solid rgba(0,212,255,.2);
  padding: 4px 12px 4px 8px;
  border-radius: 6px;
  margin-bottom: 14px;
}
.card-icon::before { content: attr(data-icon); font-size: 1rem; }

/* ─── Headings ────────────────────────────────────────────── */
h2 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--amber);
  letter-spacing: .5px;
  margin-bottom: 12px;
  text-transform: uppercase;
}

p  { margin-bottom: 12px; font-weight: 300; color: var(--text); }
p:last-child { margin-bottom: 0; }

/* ─── Lists ───────────────────────────────────────────────── */
ul { list-style: none; margin-bottom: 8px; display: flex; flex-direction: column; gap: 7px; }

li {
  padding-left: 20px;
  position: relative;
  font-weight: 300;
  font-size: .95rem;
}
li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--plasma);
  font-weight: 700;
}

/* ─── Note & code ─────────────────────────────────────────── */
.note { font-size: .9rem; color: #93c5fd; }
code {
  font-family: var(--font-mono);
  background: rgba(0,0,0,.5);
  border: 1px solid var(--panel-edge);
  padding: 1px 7px;
  border-radius: 5px;
  color: var(--plasma);
  font-size: .85em;
}

/* ─── Progress bar (JS-driven) ────────────────────────────── */
.progress-wrap {
  margin-top: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.progress-label {
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--plasma);
  white-space: nowrap;
  min-width: 40px;
  text-align: right;
}
.progress-bar {
  flex: 1;
  height: 3px;
  background: rgba(255,255,255,.06);
  border-radius: 99px;
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  width: 0;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--plasma-dim), var(--plasma), var(--violet));
  box-shadow: 0 0 8px var(--plasma);
  transition: width 1.3s cubic-bezier(.22,1,.36,1);
}

/* ─── Teleport particle (JS-injected) ────────────────────────*/
.particle {
  position: fixed;
  width: 4px; height: 4px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 999;
  animation: particle-fly .8s ease-out forwards;
}
@keyframes particle-fly {
  0%   { opacity: 1; transform: scale(1); }
  100% { opacity: 0; transform: scale(0) translate(var(--dx), var(--dy)); }
}

/* ─── Footer ──────────────────────────────────────────────── */
.footer {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: .78rem;
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--panel-edge);
  display: flex;
  align-items: center;
  gap: 8px;
}
.footer::before { content: '//'; color: var(--plasma); }

/* ─── Scroll-to-top ───────────────────────────────────────── */
#back-top {
  position: fixed;
  bottom: 28px; right: 28px;
  width: 46px; height: 46px;
  background: var(--panel);
  border: 1px solid var(--plasma-dim);
  border-radius: 8px;
  color: var(--plasma);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 16px var(--plasma-glow);
  opacity: 0; pointer-events: none;
  transition: opacity .3s, transform .3s, box-shadow .3s;
  z-index: 100;
  font-family: var(--font-ui);
}
#back-top.visible { opacity: 1; pointer-events: auto; }
#back-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 28px var(--plasma-glow), 0 0 0 1px var(--plasma);
}

/* ─── Responsive ──────────────────────────────────────────── */
@media (max-width: 600px) {
  h1 { font-size: 1.5rem; }
  .card { padding: 20px 18px; }
}