/* ── LinuxQuest — SpaceX Cinematic Design System ─────────────────── */

/* ── Custom Properties ─────────────────────────────────────────────── */
:root {
  --black:        #000000;
  --spectral:     #f0f0fa;
  --muted:        rgba(240, 240, 250, 0.5);
  --faint:        rgba(240, 240, 250, 0.25);
  --ghost-bg:     rgba(240, 240, 250, 0.06);
  --ghost-border: rgba(240, 240, 250, 0.22);
  --ghost-hover:  rgba(240, 240, 250, 0.13);
  --overlay:      rgba(0, 0, 0, 0.55);
  --green:        #76b900;   /* terminal accent — used sparingly */
  --green-dim:    rgba(118, 185, 0, 0.7);

  --font: Arial, Verdana, sans-serif;
  --radius-btn: 32px;
  --radius-sm: 4px;
}

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

/* Ensure [hidden] always wins over display:flex/grid/block rules */
[hidden] { display: none !important; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  background: var(--black);
  color: var(--spectral);
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
img { display: block; max-width: 100%; }

/* ── Scroll Animations ──────────────────────────────────────────────── */
.animate {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.75s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.75s cubic-bezier(0.22, 1, 0.36, 1);
}

.animate.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Navigation ─────────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  transition: background 0.4s ease, border-color 0.4s ease;
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(0, 0, 0, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--ghost-border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  padding: 0 32px;
  max-width: 1400px;
  margin-inline: auto;
}

.nav-logo {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--spectral);
  display: flex;
  align-items: center;
}

.nav-logo .accent { color: var(--green); }

.nav-logo-img {
  height: 56px;
  width: auto;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-link {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.17px;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 0.2s;
}

.nav-link:hover { color: var(--spectral); }

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--spectral);
  transition: transform 0.25s, opacity 0.25s;
}

.nav-hamburger.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* Mobile menu */
.nav-mobile {
  display: none;
  flex-direction: column;
  background: rgba(0, 0, 0, 0.95);
  border-top: 1px solid var(--ghost-border);
  padding: 16px 32px 24px;
  gap: 4px;
}

.nav-mobile.open { display: flex; }

.nav-mobile-link {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.17px;
  text-transform: uppercase;
  color: var(--muted);
  padding: 12px 0;
  border-bottom: 1px solid var(--ghost-border);
  transition: color 0.2s;
}

.nav-mobile-link:last-child { border-bottom: none; }
.nav-mobile-link:hover { color: var(--spectral); }

/* ── Buttons ─────────────────────────────────────────────────────────── */
.btn-ghost {
  display: inline-block;
  padding: 14px 28px;
  background: var(--ghost-bg);
  border: 1px solid var(--ghost-border);
  border-radius: var(--radius-btn);
  color: var(--spectral);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, transform 0.15s;
  white-space: nowrap;
}

.btn-ghost:hover {
  background: rgba(240, 240, 250, 0.12);
  border-color: rgba(240, 240, 250, 0.5);
  transform: translateY(-1px);
}

.btn-ghost:active { transform: translateY(0); }

.btn-ghost-dim {
  display: inline-block;
  padding: 14px 28px;
  background: transparent;
  border: 1px solid var(--faint);
  border-radius: var(--radius-btn);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, transform 0.15s;
  white-space: nowrap;
}

.btn-ghost-dim:hover {
  border-color: var(--ghost-border);
  color: var(--spectral);
  transform: translateY(-1px);
}

/* Small ghost for cards */
.btn-ghost-sm {
  display: inline-block;
  padding: 10px 20px;
  background: var(--ghost-bg);
  border: 1px solid var(--ghost-border);
  border-radius: var(--radius-btn);
  color: var(--spectral);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.btn-ghost-sm:hover {
  background: rgba(240, 240, 250, 0.12);
  border-color: rgba(240, 240, 250, 0.5);
}

/* ── Hero ─────────────────────────────────────────────────────────────── */
.hero {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(118, 185, 0, 0.04) 0%, transparent 60%),
              linear-gradient(to bottom, rgba(0,0,0,0.2) 0%, rgba(0,0,0,0) 40%, rgba(0,0,0,0.6) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 0 64px;
  max-width: 900px;
}

.hero-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(40px, 6vw, 76px);
  font-weight: 700;
  line-height: 1.0;
  letter-spacing: 0.96px;
  text-transform: uppercase;
  color: var(--spectral);
  margin-bottom: 28px;
}

.hero-sub {
  font-size: 16px;
  font-weight: 400;
  line-height: 1.7;
  color: var(--muted);
  margin-bottom: 40px;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Scroll hint */
.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 64px;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.hero-scroll-label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--faint);
  writing-mode: vertical-lr;
}

.hero-scroll-line {
  width: 1px;
  height: 48px;
  background: var(--faint);
  position: relative;
  overflow: hidden;
}

.hero-scroll-line::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--spectral);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%   { top: -100%; }
  50%  { top: 0%; }
  100% { top: 100%; }
}

/* ── Stats Bar ────────────────────────────────────────────────────────── */
.stats-bar {
  border-top: 1px solid var(--ghost-border);
  border-bottom: 1px solid var(--ghost-border);
  background: rgba(240, 240, 250, 0.02);
}

.stats-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  max-width: 1400px;
  margin-inline: auto;
  padding: 0 32px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 28px 64px;
}

.stat-num {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--spectral);
  line-height: 1;
}

.stat-label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--faint);
}

.stat-divider {
  width: 1px;
  height: 48px;
  background: var(--ghost-border);
  flex-shrink: 0;
}

/* ── Scenes (Sections) ───────────────────────────────────────────────── */
.scene {
  padding: 96px 0;
  position: relative;
}

.scene-standalone {
  background: var(--black);
}

.scene-tracks {
  background: #030303;
  border-top: 1px solid var(--ghost-border);
}

.scene-inner {
  max-width: 1400px;
  margin-inline: auto;
  padding: 0 64px;
}

.scene-header {
  margin-bottom: 56px;
}

.scene-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 16px;
}

.scene-title {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 700;
  letter-spacing: 0.96px;
  text-transform: uppercase;
  color: var(--spectral);
  line-height: 1.0;
  margin-bottom: 16px;
}

.scene-desc {
  font-size: 15px;
  font-weight: 400;
  line-height: 1.7;
  color: var(--muted);
  max-width: 560px;
}

/* ── State Messages ─────────────────────────────────────────────────── */
.state-msg {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--faint);
  padding: 40px 0;
}

/* ── Scenario Cards ──────────────────────────────────────────────────── */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.scenario-card {
  background: var(--ghost-bg);
  border: 1px solid var(--ghost-border);
  border-radius: 6px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  cursor: pointer;
  transition: background 0.3s, border-color 0.3s,
              transform 0.3s cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 0.3s;
  position: relative;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
}

.scenario-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--green);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.scenario-card:hover {
  background: rgba(240, 240, 250, 0.05);
  border-color: rgba(240, 240, 250, 0.3);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.5), 0 0 0 1px rgba(118,185,0,0.1);
}

.scenario-card:hover::before { transform: scaleX(1); }

/* Card header row */
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-prompt {
  font-family: monospace;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--ghost-border);
  transition: color 0.3s;
}

.scenario-card:hover .card-prompt { color: var(--green-dim); }

/* Difficulty labels */
.card-label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 2px;
}

.card-label-beginner     { color: var(--green);  background: rgba(118,185,0,0.1); }
.card-label-intermediate { color: #df6500;        background: rgba(223,101,0,0.1); }
.card-label-advanced     { color: #e52020;        background: rgba(229,32,32,0.1); }

.card-done {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--green);
  opacity: 0.6;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.card-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.3px;
  text-transform: uppercase;
  color: var(--spectral);
  line-height: 1.2;
}

.card-desc {
  font-size: 14px;
  font-weight: 400;
  line-height: 1.65;
  color: var(--muted);
  flex: 1;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--faint);
  background: rgba(240,240,250,0.03);
  border: 1px solid var(--ghost-border);
  padding: 3px 8px;
  border-radius: 2px;
  transition: color 0.2s, border-color 0.2s;
}

.scenario-card:hover .tag {
  color: rgba(240,240,250,0.4);
  border-color: rgba(240,240,250,0.2);
}

/* Card CTA (inline arrow link) */
.card-cta {
  margin-top: auto;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color 0.25s;
}

.scenario-card:hover .card-cta,
.track-card:hover .card-cta { color: var(--green); }

.card-cta .arrow {
  display: inline-block;
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}

.scenario-card:hover .card-cta .arrow,
.track-card:hover .card-cta .arrow { transform: translateX(4px); }

/* ── Accordion ────────────────────────────────────────────────────────── */
.accordion {
  border: 1px solid var(--ghost-border);
  margin-bottom: 56px;
}

.accordion-summary {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 28px;
  cursor: pointer;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--ghost-bg);
  list-style: none;
  user-select: none;
  transition: color 0.2s, background 0.2s;
}

.accordion-summary:hover { color: var(--spectral); background: rgba(240,240,250,0.05); }
.accordion-summary::-webkit-details-marker { display: none; }

.accordion-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  position: relative;
}

.accordion-icon::before,
.accordion-icon::after {
  content: '';
  position: absolute;
  background: var(--green);
  transition: transform 0.25s, opacity 0.25s;
  border-radius: 1px;
}

.accordion-icon::before {
  width: 12px; height: 1px;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
}

.accordion-icon::after {
  width: 1px; height: 12px;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
}

details[open] .accordion-icon::after { transform: translate(-50%, -50%) rotate(90deg); opacity: 0; }

.accordion-body {
  padding: 28px;
  border-top: 1px solid var(--ghost-border);
  background: rgba(0, 0, 0, 0.5);
}

.accordion-intro {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin-bottom: 28px;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.video-label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 12px;
}

.video-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--ghost-border);
}

.video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.video-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-align: center;
  padding: 20px;
  background: var(--ghost-bg);
}

.video-ph-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--muted);
}

.video-ph-sub {
  font-size: 9px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--faint);
}

/* ── Tracks Grid ─────────────────────────────────────────────────────── */
.tracks-grid {
  display: flex;
  flex-direction: column;
  gap: 64px;
}

/* ── Track Block ─────────────────────────────────────────────────────── */
.track-block { width: 100%; }

/* Track header bar */
.track-bar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 40px;
  padding: 32px 36px;
  background: rgba(118, 185, 0, 0.04);
  border: 1px solid rgba(118, 185, 0, 0.2);
  border-bottom: none;
}

.track-bar-left { flex: 1; min-width: 0; }

.track-env-tag {
  display: inline-block;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 10px;
}

.track-bar-title {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--spectral);
  line-height: 1.15;
  margin-bottom: 10px;
}

.track-bar-desc {
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}

.track-bar-right {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  padding-top: 4px;
}

.track-bar-progress-label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--green);
}

.track-bar-progress {
  width: 180px;
  height: 2px;
  background: var(--ghost-border);
}

.track-bar-progress-fill {
  height: 100%;
  background: var(--green);
  transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.track-bar-cta {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--spectral);
  text-decoration: none;
  transition: color 0.2s;
}
.track-bar-cta:hover { color: var(--green); }
.track-bar-cta .arrow { display: inline-block; transition: transform 0.2s; }
.track-bar-cta:hover .arrow { transform: translateX(4px); }

/* ── Scenario Cards Grid ─────────────────────────────────────────────── */
.tsc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  border: 1px solid rgba(118, 185, 0, 0.2);
}

.tsc-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px;
  border-right: 1px solid var(--ghost-border);
  border-bottom: 1px solid var(--ghost-border);
  transition: background 0.25s;
  position: relative;
  color: inherit;
}

a.tsc-card { text-decoration: none; cursor: pointer; }
a.tsc-card:hover { background: var(--ghost-bg); }

.tsc-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tsc-num {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--ghost-border);
  line-height: 1;
}

.tsc-status {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

.tsc-status-done    { color: var(--green); }
.tsc-status-current { color: var(--spectral); }
.tsc-status-locked  { color: var(--faint); }

.tsc-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.3px;
  text-transform: uppercase;
  color: var(--spectral);
  line-height: 1.4;
  flex: 1;
}

.tsc-desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.tsc-cta {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: auto;
  transition: color 0.2s;
}
a.tsc-card:hover .tsc-cta { color: var(--green); }
.tsc-cta .arrow { display: inline-block; transition: transform 0.2s; }
a.tsc-card:hover .tsc-cta .arrow { transform: translateX(4px); }

/* State variants */
.tsc-done .tsc-num   { color: rgba(118, 185, 0, 0.35); }
.tsc-current .tsc-num { color: rgba(240, 240, 250, 0.35); }

.tsc-current {
  background: rgba(240, 240, 250, 0.02);
}
.tsc-current::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--green);
}

.tsc-locked {
  opacity: 0.45;
  cursor: default;
}

.tsc-skip-btn {
  background: none;
  border: none;
  color: var(--faint);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  cursor: pointer;
  padding: 0;
  margin-top: auto;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s;
}
.tsc-skip-btn:hover { color: var(--spectral); }

/* ── Footer ─────────────────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--ghost-border);
  padding: 48px 0;
}

.footer-inner {
  max-width: 1400px;
  margin-inline: auto;
  padding: 0 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-logo { font-size: 14px; }

.footer-text {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--faint);
}

.footer-link {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 0.2s;
}

.footer-link:hover { color: var(--spectral); }

/* ── Keyframes ───────────────────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Counter animation */
.stat-num.counting {
  animation: countPulse 0.1s ease;
}

@keyframes countPulse {
  0%   { opacity: 0.4; }
  100% { opacity: 1; }
}

/* ── Responsive ─────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .scene-inner { padding: 0 40px; }
  .hero-content { padding: 0 40px; }
  .hero-scroll { left: 40px; }
  .footer-inner { padding: 0 40px; }
  .stat { padding: 24px 40px; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }

  .hero-content { padding: 0 24px; }
  .hero-scroll { display: none; }
  .hero-sub br { display: none; }

  .scene-inner { padding: 0 24px; }
  .scene { padding: 64px 0; }

  .stats-inner { flex-wrap: wrap; justify-content: center; gap: 0; }
  .stat { padding: 20px 28px; }
  .stat-divider { display: none; }

  .footer-inner { padding: 0 24px; flex-direction: column; align-items: flex-start; }

  .accordion-body { padding: 20px; }

  .scenario-grid { grid-template-columns: 1fr; }
  .tsc-grid { grid-template-columns: 1fr; }
  .track-bar { flex-direction: column; gap: 24px; }
  .track-bar-right { align-items: flex-start; }
  .track-bar-progress { width: 100%; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .btn-ghost, .btn-ghost-dim { text-align: center; }
  .nav-inner { padding: 0 20px; }
}

/* ── Scenario Page ───────────────────────────────────────────────────── */
.sp-main {
  padding-top: 60px;
  min-height: 100vh;
}

.sp-inner {
  max-width: 1100px;
  margin-inline: auto;
  padding: 48px 72px 96px;
}

/* Top bar */
.sp-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 48px;
}

.sp-back {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s;
}

.sp-back:hover { color: var(--spectral); }

/* Track progress bar */
.tp-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.tp-step {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--faint);
  border: 1px solid var(--ghost-border);
  padding: 4px 10px;
  border-radius: 2px;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.tp-step.tp-done {
  color: var(--green-dim);
  border-color: rgba(118,185,0,0.3);
}

.tp-step.tp-current {
  color: var(--green);
  border-color: var(--green);
  background: rgba(118,185,0,0.1);
}

.tp-arrow {
  font-size: 12px;
  color: var(--ghost-border);
}

/* Scenario header */
.sp-header {
  margin-bottom: 56px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--ghost-border);
}

.sp-header-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.sp-meta-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.sp-title {
  font-size: clamp(24px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--spectral);
  line-height: 1.1;
}

/* Sections */
.sp-section {
  margin-bottom: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--ghost-border);
}

.sp-section-label {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 20px;
}

.sp-section-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Text styles */
.sp-prose {
  font-size: 17px;
  line-height: 1.8;
  color: var(--muted);
}

.sp-muted { color: var(--faint); }

.sp-note {
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
  background: rgba(118,185,0,0.06);
  border-left: 2px solid var(--green);
  padding: 12px 16px;
  border-radius: 0 2px 2px 0;
}

.sp-problem {
  font-size: 19px;
  line-height: 1.8;
  color: var(--spectral);
}

/* Setup commands */
.sp-cmd-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sp-cmd {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: rgba(240,240,250,0.04);
  border: 1px solid var(--ghost-border);
  border-radius: 4px;
  padding: 12px 16px;
}

.sp-cmd-code {
  font-family: monospace;
  font-size: 16px;
  color: var(--spectral);
  word-break: break-all;
  flex: 1;
}

.sp-copy-btn {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--muted);
  background: none;
  border: 1px solid var(--ghost-border);
  border-radius: 4px;
  padding: 6px 14px;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.sp-copy-btn:hover { color: var(--spectral); border-color: rgba(240,240,250,0.4); background: rgba(240,240,250,0.06); }
.sp-copy-btn.sp-copy-done { color: var(--green); border-color: rgba(118,185,0,0.5); background: rgba(118,185,0,0.08); }

/* Hints */
.sp-hints {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sp-hint-btn {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--ghost-bg);
  border: 1px dashed var(--ghost-border);
  border-radius: 4px;
  padding: 14px 20px;
  cursor: pointer;
  text-align: left;
  width: 100%;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.sp-hint-btn:hover {
  color: var(--spectral);
  border-color: rgba(240,240,250,0.35);
  background: rgba(240,240,250,0.06);
}

.sp-hint-item {
  border: 1px solid var(--ghost-border);
  border-radius: 4px;
  padding: 16px 20px;
  background: rgba(240,240,250,0.02);
}

.sp-hint-num {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--green-dim);
  display: block;
  margin-bottom: 8px;
}

.sp-hint-text {
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

/* Commands chips */
.sp-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.sp-tags .tag,
.sp-meta-tags .tag {
  font-size: 14px;
  color: var(--spectral);
  border-color: rgba(240,240,250,0.3);
  background: rgba(240,240,250,0.07);
  font-family: monospace;
  letter-spacing: 0.5px;
  padding: 5px 12px;
}

/* Solution */
.sp-toggle {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--ghost-bg);
  border: 1px solid var(--ghost-border);
  border-radius: 32px;
  padding: 14px 28px;
  cursor: pointer;
  align-self: flex-start;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.sp-toggle:hover {
  color: var(--spectral);
  border-color: rgba(240,240,250,0.4);
  background: rgba(240,240,250,0.08);
}

.sp-toggle.sp-toggle-active {
  color: var(--green);
  border-color: rgba(118,185,0,0.4);
}

.sp-solution {
  background: rgba(240,240,250,0.04);
  border: 1px solid var(--ghost-border);
  border-radius: 4px;
  padding: 24px;
  font-family: monospace;
  font-size: 13px;
  line-height: 1.8;
  color: var(--spectral);
  white-space: pre-wrap;
  word-break: break-word;
}

/* Actions row */
.sp-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding: 40px 0 32px;
  border-top: 1px solid var(--ghost-border);
}

.sp-complete-btn {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--spectral);
  background: rgba(118,185,0,0.12);
  border: 1px solid rgba(118,185,0,0.35);
  border-radius: 32px;
  padding: 16px 36px;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.sp-complete-btn:hover {
  background: rgba(118,185,0,0.22);
  border-color: rgba(118,185,0,0.6);
}

.sp-complete-btn.sp-complete-done {
  color: var(--green);
  background: rgba(118,185,0,0.08);
  border-color: rgba(118,185,0,0.3);
}

.sp-reset-btn {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--faint);
  background: none;
  border: 1px solid var(--ghost-border);
  border-radius: 32px;
  padding: 14px 24px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

.sp-reset-btn:hover { color: #e52020; border-color: rgba(229,32,32,0.4); }

/* Track prev/next nav */
.sp-track-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0;
  border-top: 1px solid var(--ghost-border);
}

.sp-prev, .sp-next {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s;
}

.sp-prev:hover, .sp-next:hover { color: var(--spectral); }

.sp-nav-disabled { color: var(--faint); cursor: default; pointer-events: none; }

/* ── Solution steps ─────────────────────────────────────────────────── */
.sp-solution-header {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.sp-toggle-icon {
  font-style: normal;
  display: inline-block;
  transition: transform 0.25s ease;
  font-size: 12px;
}

.sp-toggle-icon-open {
  transform: rotate(0deg);
}

.sp-copy-all-btn {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--muted);
  background: none;
  border: 1px solid var(--ghost-border);
  border-radius: 32px;
  padding: 12px 22px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
  white-space: nowrap;
}

.sp-copy-all-btn:hover {
  color: var(--spectral);
  border-color: rgba(240,240,250,0.4);
  background: rgba(240,240,250,0.06);
}

.sp-copy-all-btn.sp-copy-done {
  color: var(--green);
  border-color: rgba(118,185,0,0.4);
}

/* Solution reveal animation */
@keyframes sp-reveal {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.sp-solution-wrap {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sp-solution-wrap.sp-solution-open {
  animation: sp-reveal 0.3s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

/* Numbered step */
.sp-step {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  background: rgba(240,240,250,0.03);
  border: 1px solid var(--ghost-border);
  border-radius: 8px;
  padding: 18px 20px;
  transition: border-color 0.2s, background 0.2s;
}

.sp-step:hover {
  border-color: rgba(240,240,250,0.18);
  background: rgba(240,240,250,0.05);
}

.sp-step-note {
  font-size: 15px;
  color: var(--muted);
  padding: 4px 0;
}

.sp-step-num {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  background: rgba(118,185,0,0.12);
  border: 1px solid rgba(118,185,0,0.35);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  color: var(--green);
  line-height: 1;
  margin-top: 2px;
}

/* Content area to the right of the number badge */
.sp-step-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

/* Optional description label above commands */
.sp-step-label {
  font-size: 15px;
  font-weight: 600;
  color: var(--muted);
  line-height: 1.5;
}

/* Stack of individual command rows */
.sp-step-cmds {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* Explanation text below a command block */
.sp-step-explanation {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
  margin-top: 2px;
  padding-left: 2px;
  opacity: 0.85;
}

/* Single command row: code + copy button side by side */
.sp-step-cmd {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid rgba(240,240,250,0.1);
  border-radius: 5px;
  padding: 10px 14px;
}

/* Inline label before the command (e.g. "OS info") */
.sp-step-cmd-label {
  font-family: monospace;
  font-size: 13px;
  font-weight: 700;
  color: var(--green);
  white-space: nowrap;
  flex-shrink: 0;
  opacity: 0.85;
}

.sp-step-code {
  font-family: monospace;
  font-size: 15px;
  line-height: 1.6;
  color: var(--spectral);
  white-space: pre-wrap;
  word-break: break-word;
  flex: 1;
}

/* Hint animations */
@keyframes sp-hint-in {
  from { opacity: 0; transform: translateY(-10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.sp-hint-new {
  opacity: 0;
}

.sp-hint-new.sp-hint-visible {
  animation: sp-hint-in 0.35s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.sp-hint-btn-icon {
  margin-right: 6px;
}

/* ── Scenario page responsive ────────────────────────────────────────── */
@media (max-width: 1024px) {
  .sp-inner { padding: 40px 40px 72px; }
}

@media (max-width: 768px) {
  .sp-inner { padding: 32px 24px 64px; }
  .sp-topbar { flex-direction: column; align-items: flex-start; gap: 12px; }
  .sp-actions { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .sp-cmd { flex-direction: column; align-items: flex-start; gap: 8px; }
  .sp-step { gap: 10px; }
  .sp-step-cmd { flex-direction: column; align-items: flex-start; gap: 8px; }
  .sp-step-cmd .sp-copy-btn { align-self: flex-end; }
  .sp-copy-btn { align-self: flex-end; }
}

/* ── Continue Banner ─────────────────────────────────────────────────── */
.continue-banner {
  background: rgba(118, 185, 0, 0.05);
  border-top: 1px solid rgba(118, 185, 0, 0.2);
  border-bottom: 1px solid rgba(118, 185, 0, 0.2);
}

.continue-inner {
  max-width: 1400px;
  margin-inline: auto;
  padding: 14px 64px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.continue-label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--green);
  flex-shrink: 0;
}

.continue-link {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--spectral);
  text-decoration: none;
  transition: color 0.2s;
}

.continue-link:hover { color: var(--green); }

.continue-arrow {
  display: inline-block;
  transition: transform 0.2s cubic-bezier(0.22, 1, 0.36, 1);
}

.continue-link:hover .continue-arrow { transform: translateX(4px); }

@media (max-width: 768px) {
  .continue-inner { padding: 12px 24px; }
}

/* ── Filter Bar ──────────────────────────────────────────────────────── */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.filter-pill {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--ghost-border);
  border-radius: var(--radius-btn);
  padding: 7px 16px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.filter-pill:hover {
  color: var(--spectral);
  border-color: rgba(240, 240, 250, 0.35);
  background: var(--ghost-bg);
}

.filter-pill.active {
  color: var(--spectral);
  border-color: rgba(240, 240, 250, 0.5);
  background: var(--ghost-bg);
}

.filter-pill[data-filter="beginner"].active  { color: var(--green);  border-color: rgba(118,185,0,0.5);  background: rgba(118,185,0,0.08); }
.filter-pill[data-filter="intermediate"].active { color: #df6500; border-color: rgba(223,101,0,0.5); background: rgba(223,101,0,0.08); }
.filter-pill[data-filter="advanced"].active  { color: #e52020;  border-color: rgba(229,32,32,0.5);  background: rgba(229,32,32,0.08); }

.scenario-card.filter-hidden { display: none; }

/* ── Skeleton Loading ────────────────────────────────────────────────── */
@keyframes shimmer {
  0%   { background-position: -600px 0; }
  100% { background-position: 600px 0; }
}

.sk-card {
  background: var(--ghost-bg);
  border: 1px solid var(--ghost-border);
  border-radius: 6px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 200px;
}

.sk-line {
  border-radius: 3px;
  background: linear-gradient(90deg,
    rgba(240,240,250,0.04) 0%,
    rgba(240,240,250,0.10) 50%,
    rgba(240,240,250,0.04) 100%);
  background-size: 600px 100%;
  animation: shimmer 1.6s infinite linear;
}

.sk-line-sm  { height: 10px; width: 60px; }
.sk-line-md  { height: 12px; width: 100%; }
.sk-line-lg  { height: 20px; width: 80%; }
.sk-line-xl  { height: 20px; width: 60%; }

/* ── Next Scenario (Track) ───────────────────────────────────────────── */
.sp-next-wrap {
  margin-top: 24px;
  padding: 20px 24px;
  background: rgba(118, 185, 0, 0.06);
  border: 1px solid rgba(118, 185, 0, 0.25);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  animation: sp-reveal 0.35s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.sp-next-label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 4px;
}

.sp-next-title {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.3px;
  text-transform: uppercase;
  color: var(--spectral);
}

.sp-next-btn {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--spectral);
  background: rgba(118,185,0,0.12);
  border: 1px solid rgba(118,185,0,0.4);
  border-radius: var(--radius-btn);
  padding: 12px 24px;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background 0.2s, border-color 0.2s;
  white-space: nowrap;
  flex-shrink: 0;
}

.sp-next-btn:hover {
  background: rgba(118,185,0,0.22);
  border-color: rgba(118,185,0,0.6);
}

.sp-next-btn .arrow {
  display: inline-block;
  transition: transform 0.2s;
}

.sp-next-btn:hover .arrow { transform: translateX(4px); }