/* ============================================================
   PSHELL GUIDE — Main Stylesheet
   Terminal-inspired dark theme with cyan/green accents
   ============================================================ */

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

:root {
  --bg:       #060b0f;
  --bg2:      #0a1117;
  --bg3:      #0f1923;
  --bg4:      #142030;
  --border:   rgba(0,212,170,0.1);
  --border2:  rgba(0,212,170,0.05);
  --text:     #cbd5e1;
  --muted:    #4a6a7a;
  --accent:   #00d4aa;
  --accent2:  #0ea5e9;
  --warn:     #f59e0b;
  --error:    #ef4444;
  --white:    #f1f5f9;
  --code-bg:  #0a1520;
  --prompt:   #00d4aa;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  font-size: 15px;
  line-height: 1.7;
  overflow-x: hidden;
}

/* Scanline + grain */
body::before {
  content: '';
  position: fixed; inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.03) 2px,
    rgba(0,0,0,0.03) 4px
  );
  pointer-events: none;
  z-index: 9998;
}

body::after {
  content: '';
  position: fixed; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9997;
  opacity: 0.5;
}

/* ============================================================
   PAGE SYSTEM
   ============================================================ */
.page { display: none; min-height: 100vh; }
.page.active { display: block; }

/* ============================================================
   NAV
   ============================================================ */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 500;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2.5rem;
  background: rgba(6,11,15,0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.nav-logo {
  font-family: 'Syne', 'Arial Black', sans-serif;
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--accent);
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-logo span { color: var(--white); }

.nav-links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
}

.nav-links button {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--muted);
  background: none;
  border: 1px solid transparent;
  padding: 0.4rem 0.9rem;
  border-radius: 3px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.nav-links button:hover {
  color: var(--accent);
  border-color: var(--border);
  background: var(--bg2);
}

.nav-links button.active-nav {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(0,212,170,0.06);
}

.nav-version {
  font-size: 0.65rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  opacity: 0.6;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  padding: 7rem 2.5rem 4rem;
  gap: 4rem;
  position: relative;
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 60% 70% at 70% 50%, rgba(0,212,170,0.04) 0%, transparent 70%),
              radial-gradient(ellipse 40% 50% at 10% 30%, rgba(14,165,233,0.03) 0%, transparent 60%);
}

.hero-content { position: relative; z-index: 1; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(0,212,170,0.25);
  padding: 0.35rem 0.8rem;
  border-radius: 2px;
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeUp 0.6s ease forwards 0.1s;
}

.hero-badge::before { content: '>_'; font-weight: 600; }

.hero-title {
  font-family: 'Syne', sans-serif;
  font-size: clamp(2.8rem, 5vw, 5rem);
  font-weight: 800;
  line-height: 1;
  color: var(--white);
  margin-bottom: 1.5rem;
  opacity: 0;
  animation: fadeUp 0.7s ease forwards 0.25s;
}

.hero-title .hl { color: var(--accent); }

.hero-desc {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.8;
  max-width: 480px;
  margin-bottom: 2.5rem;
  opacity: 0;
  animation: fadeUp 0.7s ease forwards 0.4s;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.7s ease forwards 0.55s;
}

.btn-primary {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  background: var(--accent);
  color: var(--bg);
  border: none;
  padding: 0.75rem 1.5rem;
  cursor: pointer;
  border-radius: 2px;
  transition: background 0.2s, transform 0.15s;
  font-weight: 600;
}

.btn-primary:hover { background: #00f0c0; transform: translateY(-1px); }

.btn-ghost {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  background: transparent;
  color: var(--accent);
  border: 1px solid rgba(0,212,170,0.4);
  padding: 0.75rem 1.5rem;
  cursor: pointer;
  border-radius: 2px;
  transition: border-color 0.2s, background 0.2s;
}

.btn-ghost:hover { border-color: var(--accent); background: rgba(0,212,170,0.07); }

.hero-terminal {
  position: relative;
  z-index: 1;
  opacity: 0;
  animation: fadeUp 0.8s ease forwards 0.3s;
}

.hero-terminal img {
  width: 100%;
  border-radius: 6px;
  border: 1px solid var(--border);
  box-shadow: 0 0 60px rgba(0,212,170,0.05), 0 20px 60px rgba(0,0,0,0.5);
}

/* Stats bar */
.hero-stats {
  border-top: 1px solid var(--border);
  padding: 1.5rem 2.5rem;
  display: flex;
  gap: 4rem;
  background: var(--bg2);
}

.stat-item {}
.stat-num {
  font-family: 'Syne', sans-serif;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}
.stat-label { font-size: 0.65rem; letter-spacing: 0.15em; text-transform: uppercase; color: var(--muted); margin-top: 0.25rem; }

/* ============================================================
   COMMAND CARDS (HOME)
   ============================================================ */
.section { padding: 4rem 2.5rem; border-bottom: 1px solid var(--border2); }
.section-header { display: flex; align-items: center; gap: 1rem; margin-bottom: 2.5rem; }

.section-tag {
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(0,212,170,0.2);
  padding: 0.25rem 0.6rem;
  border-radius: 2px;
}

.section-title {
  font-family: 'Syne', sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--white);
}

.section-line { flex: 1; height: 1px; background: var(--border2); }

.cmd-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--border2); }

.cmd-card {
  background: var(--bg2);
  padding: 1.8rem;
  cursor: pointer;
  transition: background 0.2s;
  position: relative;
  overflow: hidden;
}

.cmd-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s;
}

.cmd-card:hover { background: var(--bg3); }
.cmd-card:hover::before { transform: scaleX(1); }

.cmd-name {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 0.4rem;
  letter-spacing: 0.02em;
}

.cmd-category {
  font-size: 0.58rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.8rem;
}

.cmd-desc { font-size: 0.78rem; color: var(--text); line-height: 1.6; margin-bottom: 1rem; opacity: 0.8; }

.cmd-syntax {
  font-size: 0.7rem;
  color: var(--muted);
  background: var(--code-bg);
  border: 1px solid var(--border2);
  padding: 0.5rem 0.8rem;
  border-radius: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cmd-arrow {
  position: absolute;
  bottom: 1.5rem; right: 1.5rem;
  font-size: 0.7rem;
  color: var(--muted);
  transition: color 0.2s, transform 0.2s;
}

.cmd-card:hover .cmd-arrow { color: var(--accent); transform: translateX(4px); }

/* ============================================================
   CATEGORY PAGE (Command list page)
   ============================================================ */
.cat-header {
  padding: 5.5rem 2.5rem 3rem;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.cat-header::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 60% 80% at 90% 50%, rgba(0,212,170,0.04) 0%, transparent 70%);
}

.cat-breadcrumb {
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--muted);
  margin-bottom: 1.2rem;
  opacity: 0;
  animation: fadeUp 0.5s ease forwards 0.05s;
}

.cat-breadcrumb span { color: var(--accent); }

.cat-title {
  font-family: 'Syne', sans-serif;
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 800;
  color: var(--white);
  line-height: 1;
  margin-bottom: 1rem;
  opacity: 0;
  animation: fadeUp 0.6s ease forwards 0.15s;
}

.cat-desc {
  font-size: 0.85rem;
  color: var(--muted);
  max-width: 600px;
  line-height: 1.8;
  opacity: 0;
  animation: fadeUp 0.6s ease forwards 0.25s;
}

/* Command list */
.cmd-list { padding: 1px 2.5rem 4rem; }

.cmd-list-item {
  display: grid;
  grid-template-columns: 260px 1fr auto;
  align-items: center;
  gap: 2rem;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--border2);
  cursor: pointer;
  transition: padding-left 0.2s;
}

.cmd-list-item:hover { padding-left: 0.75rem; }

.cli-name { font-size: 0.9rem; color: var(--accent); letter-spacing: 0.02em; }
.cli-syntax { font-size: 0.68rem; color: var(--muted); margin-top: 0.2rem; }
.cli-desc { font-size: 0.8rem; color: var(--text); opacity: 0.75; }
.cli-tag {
  font-size: 0.58rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  border-radius: 2px;
  white-space: nowrap;
}
.cli-tag.core { color: var(--accent); border: 1px solid rgba(0,212,170,0.25); }
.cli-tag.util { color: var(--accent2); border: 1px solid rgba(14,165,233,0.25); }
.cli-tag.adv  { color: var(--warn);   border: 1px solid rgba(245,158,11,0.25); }

/* ============================================================
   COMMAND DETAIL PAGE
   ============================================================ */
.detail-back {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  margin: 1.5rem 2.5rem;
  transition: color 0.2s;
}

.detail-back:hover { color: var(--accent); }
.detail-back::before { content: '←'; }

.detail-header {
  padding: 2rem 2.5rem 3rem;
  border-bottom: 1px solid var(--border);
  max-width: 960px;
  margin: 0 auto;
}

.detail-meta {
  display: flex;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1.5rem;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--muted);
  flex-wrap: wrap;
}

.detail-meta .badge {
  padding: 0.2rem 0.5rem;
  border-radius: 2px;
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.badge-core  { color: var(--accent);  border: 1px solid rgba(0,212,170,0.3);  background: rgba(0,212,170,0.05); }
.badge-util  { color: var(--accent2); border: 1px solid rgba(14,165,233,0.3); background: rgba(14,165,233,0.05); }
.badge-adv   { color: var(--warn);    border: 1px solid rgba(245,158,11,0.3);  background: rgba(245,158,11,0.05); }
.badge-sec   { color: var(--error);   border: 1px solid rgba(239,68,68,0.3);   background: rgba(239,68,68,0.05); }

.detail-title {
  font-family: 'Syne', sans-serif;
  font-size: clamp(1.8rem, 3vw, 3rem);
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.75rem;
  letter-spacing: 0.02em;
}

.detail-subtitle {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.7;
}

/* Detail hero image */
.detail-img-wrap {
  max-width: 960px;
  margin: 0 auto;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.detail-img-wrap img {
  width: 100%;
  display: block;
  opacity: 0.85;
}

/* Detail body */
.detail-body {
  max-width: 860px;
  margin: 0 auto;
  padding: 3rem 2.5rem 5rem;
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 3rem;
  align-items: start;
}

.detail-main {}

.detail-main h2 {
  font-family: 'Syne', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--white);
  margin: 2.5rem 0 1rem;
  padding-left: 0.75rem;
  border-left: 2px solid var(--accent);
}

.detail-main h2:first-child { margin-top: 0; }

.detail-main p {
  font-size: 0.85rem;
  line-height: 1.85;
  color: var(--text);
  margin-bottom: 1.2rem;
  opacity: 0.85;
}

/* Code blocks */
.code-block {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  margin: 1.2rem 0;
  overflow: hidden;
}

.code-block-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 1rem;
  background: var(--bg3);
  border-bottom: 1px solid var(--border2);
}

.code-label { font-size: 0.6rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--muted); }

.code-copy {
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  background: none;
  border: none;
  cursor: pointer;
  transition: color 0.2s;
  font-family: inherit;
}

.code-copy:hover { color: var(--accent); }

.code-block pre {
  padding: 1.2rem 1rem;
  overflow-x: auto;
  font-size: 0.78rem;
  line-height: 1.7;
  white-space: pre;
}

.ps-prompt { color: var(--accent); opacity: 0.6; user-select: none; }
.ps-cmd    { color: #7dd3fc; }
.ps-param  { color: #f9a8d4; }
.ps-string { color: #86efac; }
.ps-num    { color: #fca5a5; }
.ps-pipe   { color: var(--warn); }
.ps-comment{ color: #475569; font-style: italic; }
.ps-var    { color: #c4b5fd; }
.ps-out    { color: var(--text); opacity: 0.7; }

/* Parameter table */
.param-table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.78rem; }
.param-table th {
  text-align: left;
  padding: 0.6rem 0.8rem;
  font-size: 0.62rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}
.param-table td {
  padding: 0.65rem 0.8rem;
  border-bottom: 1px solid var(--border2);
  vertical-align: top;
}
.param-table tr:last-child td { border-bottom: none; }
.param-name { color: var(--accent2); font-weight: 500; }
.param-type { color: var(--muted); font-size: 0.7rem; }
.param-desc { color: var(--text); opacity: 0.8; }

/* Sidebar */
.detail-sidebar {}

.sidebar-box {
  background: var(--bg2);
  border: 1px solid var(--border2);
  border-radius: 4px;
  padding: 1.2rem;
  margin-bottom: 1.2rem;
}

.sidebar-box-title {
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.8rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border2);
}

.sidebar-link {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
  padding: 0.35rem 0;
  cursor: pointer;
  background: none;
  border: none;
  text-align: left;
  width: 100%;
  transition: color 0.2s;
  font-family: inherit;
}

.sidebar-link:hover { color: var(--accent); }
.sidebar-link::before { content: '→ '; font-size: 0.65rem; }

.version-tag {
  display: inline-block;
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  border: 1px solid var(--border2);
  padding: 0.15rem 0.4rem;
  border-radius: 2px;
  margin-top: 0.3rem;
}

/* Output block */
.output-block {
  background: #03080a;
  border: 1px solid rgba(0,212,170,0.08);
  border-left: 3px solid rgba(0,212,170,0.3);
  border-radius: 0 4px 4px 0;
  padding: 1rem;
  margin: 1rem 0;
  font-size: 0.75rem;
  line-height: 1.7;
  color: var(--text);
  opacity: 0.8;
  overflow-x: auto;
}

/* Tip box */
.tip-box {
  background: rgba(0,212,170,0.04);
  border: 1px solid rgba(0,212,170,0.15);
  border-radius: 4px;
  padding: 1rem 1.2rem;
  margin: 1.2rem 0;
  font-size: 0.8rem;
  line-height: 1.7;
}

.tip-box strong { color: var(--accent); display: block; margin-bottom: 0.3rem; font-size: 0.65rem; letter-spacing: 0.15em; text-transform: uppercase; }

.warn-box {
  background: rgba(245,158,11,0.04);
  border: 1px solid rgba(245,158,11,0.15);
  border-radius: 4px;
  padding: 1rem 1.2rem;
  margin: 1.2rem 0;
  font-size: 0.8rem;
  line-height: 1.7;
}

.warn-box strong { color: var(--warn); display: block; margin-bottom: 0.3rem; font-size: 0.65rem; letter-spacing: 0.15em; text-transform: uppercase; }

/* ============================================================
   FOOTER
   ============================================================ */
footer {
  padding: 2rem 2.5rem;
  border-top: 1px solid var(--border2);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-logo {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 0.9rem;
  color: var(--accent);
  background: none;
  border: none;
  cursor: pointer;
}

.footer-right {
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

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

.cursor { animation: blink 1s step-end infinite; }

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: none; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .hero { grid-template-columns: 1fr; }
  .hero-terminal { display: none; }
  .cmd-grid { grid-template-columns: repeat(2, 1fr); }
  .detail-body { grid-template-columns: 1fr; }
  .detail-sidebar { display: none; }
}

@media (max-width: 700px) {
  nav { padding: 0 1.2rem; }
  .nav-version { display: none; }
  .nav-links { gap: 0; }
  .hero { padding: 5rem 1.2rem 3rem; }
  .hero-stats { gap: 2rem; flex-wrap: wrap; }
  .cmd-grid { grid-template-columns: 1fr; }
  .section { padding: 3rem 1.2rem; }
  .cat-header, .cmd-list { padding-left: 1.2rem; padding-right: 1.2rem; }
  .cmd-list-item { grid-template-columns: 1fr; }
  .cli-tag { display: none; }
  .detail-header { padding: 2rem 1.2rem; }
  .detail-body { padding: 2rem 1.2rem 4rem; }
  .detail-back { margin: 1.5rem 1.2rem; }
  footer { padding: 1.5rem 1.2rem; flex-direction: column; gap: 0.75rem; text-align: center; }
}