/* about.css — Restore 64 landing page & documentation */

:root {
  --bg: #16161e;
  --bg2: #1e1e2e;
  --bg3: #262637;
  --c64blue: #40318d;
  --c64ltblue: #7b71a8;
  --accent: #7e83d1;
  --text: #b0b8cd;
  --dim: #6c7086;
  --green: #6dbf67;
  --green-dim: #4a8a46;
  --red: #d94452;
  --yellow: #d4a843;
  --orange: #fab387;
  --purple: #cba6f7;
  --blue: #7096c8;
  --teal: #6fb8ad;
  --subtext: #a6adc8;
  --c64-black: #000000; --c64-white: #ffffff; --c64-red: #9f4e44; --c64-cyan: #6abfc6;
  --c64-purple: #a057a3; --c64-green: #5cab5e; --c64-dkblue: #50459b; --c64-yellow: #c9d487;
  --c64-orange: #a1683c; --c64-brown: #6d5412; --c64-ltred: #cb7e75; --c64-dkgrey: #626262;
  --c64-grey: #898989; --c64-ltgreen: #9ae29b; --c64-ltblue2: #887ecb; --c64-ltgrey: #adadad;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 56px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 14px;
  line-height: 1.7;
  overflow-y: auto;
}

a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--c64ltblue); }

/* ── Navigation ── */
header {
  position: sticky; top: 0; z-index: 50;
  background: var(--c64blue);
  border-bottom: 3px solid var(--accent);
  padding: 0 24px;
  display: flex; align-items: center; gap: 16px;
  height: 52px;
  transition: height 1.5s ease-in-out, background-color 1.5s ease-in-out;
}
header .logo {
  font-size: 16px; font-weight: 700; letter-spacing: 1px; color: #fff;
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; flex-shrink: 0;
}
header .logo img { width: 24px; height: 24px; }
header nav { display: flex; gap: 20px; margin-left: auto; overflow-x: auto; }
header nav a {
  color: var(--subtext); font-size: 12px; text-transform: uppercase;
  letter-spacing: 1px; white-space: nowrap; padding: 4px 0;
  text-decoration: none; transition: color .2s;
}
header nav a:hover { color: #fff; }

/* ── Sections ── */
.section { padding: 80px 24px; }
.section-inner { max-width: 1100px; margin: 0 auto; }
.section h2 {
  font-size: 24px; color: #fff; margin-bottom: 12px;
  border-bottom: 2px solid var(--bg3); padding-bottom: 12px;
}
.section h2 .dim { color: var(--dim); font-weight: 400; font-size: 14px; margin-left: 8px; }
.section h3 { font-size: 16px; color: var(--accent); margin: 32px 0 12px; }
.section p { margin-bottom: 16px; max-width: 780px; }

/* ── Hero ── */
#hero {
  min-height: 92vh;
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  background: linear-gradient(180deg, var(--c64blue) 0%, var(--bg) 100%);
  position: relative; overflow: hidden;
  padding: 80px 24px;
}
#hero::after {
  content: '';
  position: absolute; inset: 0;
  background: repeating-linear-gradient(
    0deg, transparent 0px, transparent 2px,
    rgba(0,0,0,0.06) 2px, rgba(0,0,0,0.06) 4px
  );
  pointer-events: none;
}
#hero .hero-content { position: relative; z-index: 1; max-width: 800px; }
#hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700; color: #fff;
  text-shadow: 0 0 60px rgba(126,131,209,0.5), 0 0 120px rgba(126,131,209,0.2);
  letter-spacing: 2px; margin-bottom: 16px;
}
#hero .tagline {
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  color: var(--subtext); margin-bottom: 8px;
}
#hero .subtext {
  font-size: 13px; color: var(--dim); margin-bottom: 40px;
  max-width: 560px; margin-left: auto; margin-right: auto;
}
.cta {
  display: inline-block;
  background: var(--accent); color: #fff;
  padding: 14px 36px; border-radius: 8px;
  font-family: inherit; font-size: 15px; font-weight: 700;
  letter-spacing: .5px;
  transition: background .2s, transform .2s, box-shadow .2s;
  box-shadow: 0 4px 20px rgba(126,131,209,0.3);
}
.cta:hover {
  background: #9196e0; color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(126,131,209,0.45);
}
.hero-sample {
  margin-top: 48px; text-align: left;
  background: var(--bg); border: 1px solid var(--bg3); border-radius: 8px;
  padding: 20px 24px; font-size: 12px; line-height: 1.5;
  max-width: 620px; margin-left: auto; margin-right: auto;
  overflow-x: auto; box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

/* ── Syntax highlighting (for inline samples) ── */
.hl-comment { color: var(--green-dim); }
.hl-label { color: var(--yellow); font-weight: 700; }
.hl-dir { color: var(--purple); }
.hl-num { color: var(--green); }
.hl-illegal { color: var(--red); font-weight: 700; }
.hl-string { color: var(--orange); }
.hl-mnemonic { color: var(--blue); }
.hl-hwreg { color: var(--teal); }

/* ── Feature banner (top quick-facts) ── */
.feature-banner {
  display: flex; flex-wrap: wrap; gap: 16px;
  margin-bottom: 32px;
  padding: 20px 0;
  border-bottom: 1px solid var(--bg3);
}
.feature-banner-item {
  display: flex; align-items: center; gap: 12px;
  flex: 1 1 200px; min-width: 180px;
  font-size: 13px; color: var(--subtext); line-height: 1.5;
}
.feature-banner-item strong { color: #fff; }
.banner-icon { font-size: 28px; flex-shrink: 0; line-height: 1; }

/* ── Feature rows ── */
.feature-row {
  display: flex; gap: 20px;
  margin-bottom: 20px;
}
.feature-row:last-child { margin-bottom: 0; }

.card-major { flex: 2; }
.card-minor { flex: 1; }
.card-equal { flex: 1; }

/* ── Feature cards ── */
.feature-card {
  background: var(--bg2);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  padding: 20px 24px;
  transition: box-shadow .3s, border-color .3s, transform .3s;
  min-width: 0;
}
.feature-card:hover {
  box-shadow: 0 0 24px rgba(126,131,209,0.12);
  transform: translateY(-2px);
}
.feature-card h4 {
  font-size: 14px; margin-bottom: 8px;
}
.feature-card p { font-size: 13px; color: var(--subtext); margin: 0; line-height: 1.6; }

/* Color variants */
.card-green { border-left-color: var(--green); }
.card-green h4 { color: var(--green); }
.card-green:hover { box-shadow: 0 0 28px rgba(109,191,103,0.12); border-left-color: var(--green); }

.card-purple { border-left-color: var(--purple); }
.card-purple h4 { color: var(--purple); }
.card-purple:hover { box-shadow: 0 0 28px rgba(203,166,247,0.12); border-left-color: var(--purple); }

.card-blue { border-left-color: var(--blue); }
.card-blue h4 { color: var(--blue); }
.card-blue:hover { box-shadow: 0 0 28px rgba(112,150,200,0.12); border-left-color: var(--blue); }

.card-teal { border-left-color: var(--teal); }
.card-teal h4 { color: var(--teal); }
.card-teal:hover { box-shadow: 0 0 28px rgba(111,184,173,0.12); border-left-color: var(--teal); }

.card-yellow { border-left-color: var(--yellow); }
.card-yellow h4 { color: var(--yellow); }
.card-yellow:hover { box-shadow: 0 0 28px rgba(212,168,67,0.12); border-left-color: var(--yellow); }

/* ── Pipeline ── */
.pipeline {
  display: flex; align-items: center; justify-content: center;
  gap: 0; flex-wrap: wrap; margin: 32px 0;
}
.pipeline-step {
  background: var(--bg3); border-radius: 8px;
  padding: 16px 20px; text-align: center;
  min-width: 140px; flex-shrink: 0;
}
.pipeline-step .step-title { color: #fff; font-size: 13px; font-weight: 700; }
.pipeline-step .step-desc { color: var(--dim); font-size: 11px; margin-top: 4px; }
.pipeline-arrow {
  color: var(--accent); font-size: 24px; padding: 0 8px;
  flex-shrink: 0; font-weight: 700;
}

/* ── Packer collapse/expand ── */
.packer-collapse { position: relative; }
.packer-fade {
  overflow: hidden;
  position: relative;
  transition: height .6s ease-out;
}
.packer-fade.collapsed {
  height: 180px;
}
.packer-fade.collapsed::after {
  content: '';
  position: absolute; bottom: 0; left: 0; right: 0; height: 80px;
  background: linear-gradient(transparent, var(--bg));
  pointer-events: none;
}
.packer-expand-btn {
  display: block;
  margin: 12px auto 0; padding: 8px 24px;
  background: var(--bg3); color: var(--subtext);
  border: 1px solid var(--dim); border-radius: 6px;
  font-family: inherit; font-size: 12px;
  cursor: pointer; text-align: center;
  transition: color .2s, border-color .2s, background .2s;
  width: fit-content;
}
.packer-expand-btn:hover {
  color: #fff; border-color: var(--accent);
  background: rgba(126,131,209,0.1);
}

/* ── Packer list ── */
.packer-details summary {
  cursor: pointer; color: var(--accent); font-weight: 700;
  font-size: 14px; padding: 8px 0;
  list-style: none;
}
.packer-details summary::before {
  content: '\25B6'; margin-right: 8px; font-size: 11px;
  display: inline-block; transition: transform .2s;
}
.packer-details[open] summary::before { transform: rotate(90deg); }
.packer-list {
  column-count: 4; column-gap: 24px;
  margin-top: 16px; font-size: 12px; line-height: 2;
}
.packer-list span {
  display: block; break-inside: avoid;
  color: var(--subtext);
}
.packer-list span.well-known { color: var(--green); font-weight: 600; }
.cat-count {
  display: inline-block; background: var(--bg3); color: var(--dim);
  font-size: 11px; font-weight: 400; padding: 2px 8px; border-radius: 10px;
  margin-left: 6px; vertical-align: middle;
}
.cat-desc {
  font-size: 13px; color: var(--dim); margin: 8px 0 12px;
  font-style: italic;
}
.packer-details { margin-bottom: 8px; }
.packer-details + .packer-details { border-top: 1px solid var(--bg3); padding-top: 8px; }

/* ── Documentation ── */
.doc-steps { counter-reset: step; list-style: none; margin: 16px 0 24px; }
.doc-steps li {
  counter-increment: step;
  padding: 8px 0 8px 40px; position: relative;
  font-size: 13px;
}
.doc-steps li::before {
  content: counter(step);
  position: absolute; left: 0; top: 6px;
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--bg3); color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700;
}

.opts-table { width: 100%; border-collapse: collapse; margin: 16px 0 32px; font-size: 13px; }
.opts-table th {
  text-align: left; padding: 10px 16px;
  background: var(--c64blue); color: #fff;
  font-size: 12px; text-transform: uppercase; letter-spacing: 1px;
}
.opts-table td {
  padding: 10px 16px; border-bottom: 1px solid var(--bg3);
}
.opts-table tr:nth-child(even) td { background: var(--bg2); }
.opts-table tr:nth-child(odd) td { background: var(--bg); }
.opts-table code {
  background: var(--bg3); padding: 2px 6px; border-radius: 3px;
  font-size: 12px;
}

.doc-sample {
  background: var(--bg); border: 1px solid var(--bg3); border-radius: 6px;
  padding: 16px 20px; font-size: 12px; line-height: 1.5;
  overflow-x: auto; margin: 16px 0 24px;
}

/* FAQ */
.faq-item { border-bottom: 1px solid var(--bg3); }
.faq-item summary {
  cursor: pointer; padding: 16px 0;
  font-weight: 700; font-size: 14px; color: #fff;
  list-style: none;
}
.faq-item summary::before {
  content: '+'; margin-right: 12px; color: var(--accent);
  font-size: 18px; font-weight: 700;
  display: inline-block; transition: transform .2s;
}
.faq-item[open] summary::before { content: '\2212'; }
.faq-item .faq-answer {
  padding: 0 0 16px 28px; font-size: 13px;
  color: var(--subtext); max-width: 700px;
}

/* ── Footer ── */
footer {
  background: var(--bg2);
  border-top: 1px solid var(--bg3);
  padding: 32px 24px;
  text-align: center; font-size: 12px; color: var(--dim);
}
footer a { color: var(--c64ltblue); }
.c64-palette {
  display: flex; justify-content: center; gap: 2px;
  margin: 16px auto 12px;
}
.c64-palette span {
  width: 20px; height: 12px; border-radius: 2px;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .packer-list { column-count: 3; }
}
@media (max-width: 768px) {
  .section { padding: 48px 16px; }
  #hero { min-height: 80vh; padding: 60px 16px; }
  #hero h1 { font-size: clamp(2rem, 8vw, 3rem); }
  .packer-list { column-count: 2; }
  .pipeline { flex-direction: column; gap: 0; }
  .pipeline-arrow { transform: rotate(90deg); padding: 4px 0; }
  .feature-row { flex-direction: column; }
  .feature-banner { gap: 12px; }
  .feature-banner-item { flex: 1 1 140px; min-width: 140px; }
  .opts-table { font-size: 12px; }
  .opts-table th, .opts-table td { padding: 8px 10px; }
  header { gap: 12px; padding: 0 12px; }
  header nav { gap: 12px; }
}
@media (max-width: 480px) {
  .packer-list { column-count: 1; }
  .hero-sample { font-size: 11px; padding: 12px 14px; }
  .feature-banner-item { flex: 1 1 100%; }
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--bg3); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--dim); }