/* =============================================
   Developer Foundations — styles.css
   ============================================= */

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

:root {
  --bg:      #0c0f0a;
  --surface: #111410;
  --card:    #161a13;
  --border:  #252920;
  --green:   #7cfc5a;
  --green-d: #3a7a22;
  --green-g: rgba(124,252,90,.07);
  --amber:   #f5c842;
  --blue:    #5af0fc;
  --white:   #e8eee4;
  --muted:   #5a6350;
  --ff:      'Syne', sans-serif;
  --fm:      'JetBrains Mono', monospace;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--white);
  font-family: var(--fm);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── SCAN LINE OVERLAY ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,.03) 2px,
    rgba(0,0,0,.03) 4px
  );
  pointer-events: none;
  z-index: 9000;
}

/* ── GLOW ORB BACKGROUND ── */
body::after {
  content: '';
  position: fixed;
  width: 700px; height: 700px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(124,252,90,.04) 0%, transparent 70%);
  top: -200px; left: -200px;
  pointer-events: none;
  z-index: 0;
  animation: orbdrift 18s ease-in-out infinite alternate;
}

@keyframes orbdrift {
  from { transform: translate(0, 0); }
  to   { transform: translate(120px, 80px); }
}

/* ── HEADER ── */
header {
  position: relative;
  z-index: 2;
  padding: 3.5rem 4rem 2.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
}

.header-badge {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-size: .6rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: .8rem;
}

.header-badge::before {
  content: '';
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px var(--green);
  animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: .3; }
}

.header-title {
  font-family: var(--ff);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--white);
}

.header-title span { color: var(--green); }

.header-meta {
  font-size: .58rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: right;
  line-height: 2;
}

/* ── MAIN ── */
main {
  position: relative;
  z-index: 2;
  max-width: 1100px;
  margin: 0 auto;
  padding: 4rem 4rem 6rem;
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

/* ── CARD BASE ── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 2px;
  overflow: hidden;
  position: relative;
  transition: border-color .3s, box-shadow .3s;
}

.card:hover {
  border-color: var(--green-d);
  box-shadow: 0 0 30px rgba(124,252,90,.04);
}

.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--green), transparent);
  opacity: 0;
  transition: opacity .3s;
}

.card:hover::before { opacity: 1; }

.card-header {
  display: flex;
  align-items: center;
  gap: .8rem;
  padding: .9rem 1.5rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.card-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
}
.card-dot.r { background: #ff5f57; }
.card-dot.y { background: #febc2e; }
.card-dot.g { background: #28c840; }

.card-title-bar {
  font-size: .6rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-left: .3rem;
}

.card-body { padding: 2rem 2.5rem; }

/* ── STEP HEADING ── */
.step-heading {
  font-family: var(--ff);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--amber);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: .7rem;
}

.step-heading::before {
  content: '$';
  color: var(--green);
  font-family: var(--fm);
  font-size: 1rem;
}

/* ── TERMINAL COMMAND ── */
.cmd {
  display: flex;
  align-items: center;
  gap: .8rem;
  padding: .9rem 1.4rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 2px;
  margin-bottom: .7rem;
  font-size: .82rem;
  letter-spacing: .03em;
  color: var(--green);
  position: relative;
  overflow: hidden;
  transition: background .2s;
}

.cmd:hover { background: rgba(124,252,90,.04); }
.cmd::before { content: '❯'; color: var(--muted); flex-shrink: 0; }

/* ── STEP LIST ── */
.step-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  counter-reset: step;
}

.step-list li {
  display: grid;
  grid-template-columns: 1.8rem 1fr;
  gap: .5rem;
  align-items: baseline;
  padding: .8rem 1rem;
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: .88rem;
  line-height: 1.6;
  color: var(--white);
  transition: background .2s, border-color .2s;
  counter-increment: step;
}

.step-list li:hover { background: var(--green-g); border-color: var(--border); }

.step-list li::before {
  content: counter(step, decimal-leading-zero);
  font-size: .58rem;
  color: var(--green);
  letter-spacing: .1em;
  font-weight: 700;
  padding-top: .1rem;
}

/* ── INLINE CODE ── */
code {
  font-family: var(--fm);
  font-size: .8em;
  color: var(--green);
  background: rgba(124,252,90,.08);
  padding: .1em .4em;
  border-radius: 2px;
}

/* ── NOTE BLOCK ── */
.note {
  display: flex;
  gap: 1rem;
  padding: 1.2rem 1.6rem;
  background: rgba(245,200,66,.04);
  border: 1px solid rgba(245,200,66,.15);
  border-left: 3px solid var(--amber);
  font-size: .85rem;
  line-height: 1.75;
  color: #c8bea0;
}

.note-icon { font-size: 1rem; flex-shrink: 0; padding-top: .1rem; }

/* ── IMAGE SECTION ── */
.img-wrap { position: relative; }

.img-label {
  font-size: .55rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
}

.img-frame {
  position: relative;
  display: inline-block;
  width: 100%;
}

.img-frame img {
  display: block;
  width: 100%;
  max-width: 500px;
  height: auto;
  filter: saturate(.9) contrast(1.05);
  border: 1px solid var(--border);
  transition: filter .3s;
}

.img-frame:hover img { filter: saturate(1.1) contrast(1.1); }

/* corner bracket accents */
.img-frame::before,
.img-frame::after {
  content: '';
  position: absolute;
  width: 20px; height: 20px;
  pointer-events: none;
}

.img-frame::before { top: -1px; left: -1px; border-top: 2px solid var(--green); border-left: 2px solid var(--green); }
.img-frame::after  { bottom: -1px; right: -1px; border-bottom: 2px solid var(--green); border-right: 2px solid var(--green); }

.img-caption {
  margin-top: .8rem;
  font-size: .6rem;
  letter-spacing: .12em;
  color: var(--muted);
  text-transform: uppercase;
}

.img-caption span { color: var(--green); }

/* ── PDF LINK ── */
.pdf-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.5rem 2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--white);
  transition: border-color .25s, background .25s, transform .2s;
  position: relative;
  overflow: hidden;
}

.pdf-link::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(124,252,90,.05), transparent);
  opacity: 0;
  transition: opacity .3s;
}

.pdf-link:hover { border-color: var(--green-d); transform: translateX(4px); }
.pdf-link:hover::before { opacity: 1; }

.pdf-left { display: flex; align-items: center; gap: 1.2rem; }

.pdf-icon {
  width: 44px; height: 44px;
  background: var(--card);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
  transition: border-color .25s;
}

.pdf-link:hover .pdf-icon { border-color: var(--green-d); }

.pdf-label { font-size: .55rem; letter-spacing: .16em; text-transform: uppercase; color: var(--muted); margin-bottom: .25rem; }
.pdf-name  { font-family: var(--ff); font-size: 1rem; font-weight: 700; color: var(--white); }

.pdf-arrow { color: var(--green); font-size: 1.4rem; transition: transform .25s; }
.pdf-link:hover .pdf-arrow { transform: translateX(5px); }

/* ── FOOTER ── */
footer {
  position: relative;
  z-index: 2;
  padding: 1.5rem 4rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

footer span { font-size: .55rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
footer .g  { color: var(--green); }

/* ── SCROLL REVEAL ── */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .6s, transform .6s;
}

.fade-in.in { opacity: 1; transform: translateY(0); }

/* ── RESPONSIVE ── */
@media (max-width: 700px) {
  header, main, footer { padding-left: 1.5rem; padding-right: 1.5rem; }
  header { flex-direction: column; align-items: flex-start; }
  .header-meta { text-align: left; }
  .card-body { padding: 1.5rem; }
}