/* ════════════════════════════════════════
   SRI AI Training — Shared Stylesheet
   assets/main.css
════════════════════════════════════════ */

html { scroll-behavior: smooth; }
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── DARK THEME (default) ── */
:root {
  --black:    #0d0d0d;
  --dark:     #141414;
  --dark2:    #1c1c1c;
  --dark3:    #252525;
  --border:   rgba(255,255,255,0.08);
  --border2:  rgba(255,255,255,0.14);
  --white:    #ffffff;
  --off:      #a0a0a0;
  --muted:    #6a6a6a;
  --accent:   #c2ee00;
  --accent2:  #a3c700;
  --teal:     #2962ff;
  --teal-bg:  rgba(41,98,255,0.08);
  --teal-bd:  rgba(41,98,255,0.25);
  --amber:    #f59e0b;
  --amber-bg: rgba(245,158,11,0.08);
  --amber-bd: rgba(245,158,11,0.3);
  --red:      #f87171;
  --red-bg:   rgba(248,113,113,0.08);
  --red-bd:   rgba(248,113,113,0.3);
  --blue:     #63b3ed;
  --blue-bg:  rgba(99,179,237,0.08);
  --blue-bd:  rgba(99,179,237,0.2);
  --radius:   6px;
  --radius-sm: 6px;
  --page-bg:  #0d0d0d;
  --code-surface: #0a0a0a;
  --logo-filter: none;
  /* callout text */
  --tip-text:     #d0d8a0;
  --warn-text:    #d4a86a;
  --success-text: #7dd9bc;
  --danger-text:  #f8a8a8;
  /* inline code tint (lime) */
  --code-tint-bg: rgba(194,238,0,0.07);
  --code-tint-bd: rgba(194,238,0,0.15);
  --code-tint-col: var(--accent);
  /* accent fill tints */
  --accent-bg: rgba(194,238,0,0.08);
  --accent-bd: rgba(194,238,0,0.2);
  --accent-bg2: rgba(194,238,0,0.1);
  --accent-bd2: rgba(194,238,0,0.25);
}

/* ── LIGHT THEME ── */
[data-theme="light"] {
  --page-bg:  #f0f0f0;
  --dark:     #ffffff;
  --dark2:    #ffffff;
  --dark3:    #e4e4e4;
  --border:   rgba(0,0,0,0.09);
  --border2:  rgba(0,0,0,0.16);
  --white:    #0d0d0d;
  --off:      #3c3c3c;
  --muted:    #7a7a7a;
  --accent:   #2962ff;
  --accent2:  #1a4fcc;
  --teal:     #2962ff;
  --teal-bg:  rgba(41,98,255,0.07);
  --teal-bd:  rgba(41,98,255,0.22);
  --amber:    #b45309;
  --amber-bg: rgba(180,83,9,0.07);
  --amber-bd: rgba(180,83,9,0.25);
  --red:      #c42b2b;
  --red-bg:   rgba(196,43,43,0.07);
  --red-bd:   rgba(196,43,43,0.22);
  --blue:     #2962ff;
  --blue-bg:  rgba(41,98,255,0.07);
  --blue-bd:  rgba(41,98,255,0.22);
  --code-surface: #1a1a1a;
  --logo-filter: brightness(0);
  --tip-text:     #1a3800;
  --warn-text:    #5a2d00;
  --success-text: #002a6b;
  --danger-text:  #6b0000;
  --code-tint-bg: rgba(41,98,255,0.07);
  --code-tint-bd: rgba(41,98,255,0.18);
  --code-tint-col: #1a4fcc;
  --accent-bg: rgba(41,98,255,0.07);
  --accent-bd: rgba(41,98,255,0.2);
  --accent-bg2: rgba(41,98,255,0.1);
  --accent-bd2: rgba(41,98,255,0.25);
}

/* ── BASE ── */
body {
  font-family: 'Inter', sans-serif;
  background: var(--page-bg);
  color: var(--white);
  min-height: 100vh;
  padding: 0 0 4rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── HEADER ── */
.site-header {
  background: var(--dark);
  border-bottom: 1px solid var(--border);
  padding: 12px 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  gap: 12px;
}
.header-left {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}
.logo-link {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none !important;
}
.logo-img {
  height: 30px;
  width: auto;
  display: block;
  filter: var(--logo-filter);
  transition: opacity 0.15s;
}
.logo-link:hover .logo-img { opacity: 0.8; }

.header-nav {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1px;
  min-width: 0;
}
.header-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--off);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.bc-home {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.12s;
}
.bc-home:hover { color: var(--off); text-decoration: none; }
.bc-sep { color: var(--muted); opacity: 0.5; }
.bc-current { color: var(--off); font-weight: 500; overflow: hidden; text-overflow: ellipsis; }

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.header-badge {
  font-size: 11px;
  font-weight: 600;
  background: var(--accent);
  color: #0d0d0d;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: 0.03em;
  white-space: nowrap;
}
.header-badge.red { background: var(--red); }
.module-counter {
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.03em;
  white-space: nowrap;
}

/* ── THEME TOGGLE ── */
.theme-toggle {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border2);
  background: var(--dark3);
  color: var(--off);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.15s, color 0.15s;
  flex-shrink: 0;
  padding: 0;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.theme-toggle svg { display: none; pointer-events: none; }
/* dark mode: show sun (click to go light) */
:root .theme-toggle .icon-sun { display: block; }
/* light mode: show moon (click to go dark) */
[data-theme="light"] .theme-toggle .icon-moon { display: block; }
[data-theme="light"] .theme-toggle .icon-sun  { display: none; }

/* ── THEME TRANSITION ── */
html.theme-transitioning,
html.theme-transitioning *,
html.theme-transitioning *::before,
html.theme-transitioning *::after {
  transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease, filter 0.25s ease !important;
}

/* ── WRAPPER ── */
.wrapper {
  max-width: 860px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
}
@media (min-width: 1440px) {
  .wrapper { max-width: 960px; }
}

/* ── PROGRESS ── */
.progress-wrap { margin-bottom: 2.5rem; }
.progress-steps { display: flex; gap: 5px; margin-bottom: 10px; }
.p-step {
  flex: 1; height: 3px; border-radius: 2px;
  background: var(--dark3);
  transition: background 0.35s ease;
}
.p-step.done   { background: var(--teal); }
.p-step.active { background: var(--accent); }
.progress-meta { display: flex; justify-content: space-between; align-items: center; }
.progress-label { font-size: 12px; color: var(--muted); }
.progress-title { font-size: 12px; color: var(--off); font-weight: 500; }

/* ── SECTION ANIM ── */
.section { display: none; }
.section.active { display: block; animation: fadeUp 0.22s ease; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── SECTION HEADER ── */
.section-eyebrow { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.eyebrow-pill {
  font-size: 11px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
  background: var(--accent); color: #0d0d0d;
  padding: 3px 9px; border-radius: 20px;
}
.eyebrow-label { font-size: 12px; color: var(--muted); }

h1 {
  font-size: 32px; font-weight: 700;
  letter-spacing: -0.03em; margin-bottom: 12px;
  line-height: 1.2; color: var(--white);
}
h2 {
  font-size: 22px; font-weight: 700;
  letter-spacing: -0.02em; margin-bottom: 8px;
  color: var(--white);
}
.lead {
  font-size: 16px; color: var(--off);
  margin-bottom: 2rem; line-height: 1.7;
}

/* ── SECTION LABEL (hub) ── */
.section-label {
  font-size: 11px; font-weight: 700; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--muted); margin-bottom: 12px;
}

/* ── CARDS ── */
.card {
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  margin-bottom: 1rem;
}
.card-label {
  font-size: 11px; font-weight: 700; letter-spacing: 0.07em;
  color: var(--muted); text-transform: uppercase;
  margin-bottom: 12px; display: flex; align-items: center; gap: 6px;
}
.badge-tag {
  font-size: 10px; font-weight: 600;
  background: var(--dark3); color: var(--off);
  border: 1px solid var(--border2); padding: 2px 8px;
  border-radius: 20px; letter-spacing: 0.03em;
}
.badge-tag.accent {
  background: var(--accent-bg2); color: var(--accent);
  border-color: var(--accent-bd2);
}

/* ── MODULE CARDS (hub) ── */
.modules-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
  margin-bottom: 2.5rem;
}
.module-card {
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  text-decoration: none; color: inherit;
  transition: border-color 0.15s, transform 0.15s;
  display: flex; flex-direction: column; gap: 6px;
}
.module-card:hover { border-color: var(--border2); transform: translateY(-1px); text-decoration: none; }
.module-card.featured {
  border-color: var(--accent-bd2);
  background: linear-gradient(135deg, var(--accent-bg) 0%, var(--dark2) 60%);
}
.module-tag {
  font-size: 11px; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase;
  padding: 2px 8px; border-radius: 20px; display: inline-block; margin-bottom: 4px;
  width: fit-content;
}
.tag-start  { background: var(--accent-bg2); color: var(--accent); border: 1px solid var(--accent-bd2); }
.tag-guide  { background: var(--teal-bg); color: var(--teal); border: 1px solid var(--teal-bd); }
.tag-soon   { background: var(--dark3); color: var(--muted); border: 1px solid var(--border); }
.tag-resource { background: var(--blue-bg); color: var(--blue); border: 1px solid var(--blue-bd); }
.module-title { font-size: 16px; font-weight: 700; color: var(--white); }
.module-desc  { font-size: 13px; color: var(--muted); line-height: 1.55; }
.module-arrow { font-size: 16px; color: var(--muted); margin-top: auto; padding-top: 10px; transition: color 0.15s; }
.module-card:hover .module-arrow { color: var(--accent); }
.module-card.disabled { pointer-events: none; opacity: 0.5; }

/* ── HUB HERO ── */
.hero { margin-bottom: 3rem; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--teal-bg); border: 1px solid var(--teal-bd);
  border-radius: 20px; padding: 4px 12px; margin-bottom: 16px;
}
.hero-eyebrow span {
  font-size: 11px; font-weight: 600; color: var(--teal);
  letter-spacing: 0.04em; text-transform: uppercase;
}
.hero h1 { font-size: 34px; margin-bottom: 12px; }
.hero p { font-size: 16px; color: var(--off); line-height: 1.7; max-width: 580px; }

/* ── STEP LIST ── */
.step-list { list-style: none; counter-reset: sl; }
.step-list li {
  counter-increment: sl;
  display: flex; gap: 12px; align-items: flex-start;
  font-size: 16px; line-height: 1.7; margin-bottom: 14px; color: var(--off);
}
.step-list li:last-child { margin-bottom: 0; }
.step-list li::before {
  content: counter(sl);
  min-width: 22px; height: 22px; border-radius: 50%;
  background: var(--dark3); border: 1px solid var(--border2);
  display: flex; align-items: center; justify-content: center;
  font-size: 10px; font-weight: 700; color: var(--accent);
  flex-shrink: 0; margin-top: 2px;
}
.step-list li strong { color: var(--white); font-weight: 600; }

/* ── BULLET LIST ── */
.bullet-list { list-style: none; }
.bullet-list li {
  display: flex; gap: 10px; align-items: flex-start;
  font-size: 16px; color: var(--off); line-height: 1.7;
  margin-bottom: 8px; padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.bullet-list li:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.bullet-list li::before { content: "—"; color: var(--red); font-weight: 700; flex-shrink: 0; margin-top: 1px; }
.bullet-list li strong { color: var(--white); }

/* ── CODE BLOCKS ── */
.cmd {
  background: var(--code-surface);
  border: 1px solid var(--border2);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 10px; margin-top: 8px;
}
.cmd code {
  font-family: 'JetBrains Mono', monospace; font-size: 14px;
  color: var(--accent); background: none; border: none;
  padding: 0; flex: 1;
}
.copy-btn {
  font-size: 11px; font-weight: 600;
  font-family: 'Inter', sans-serif; letter-spacing: 0.03em;
  padding: 4px 11px; border-radius: 4px;
  border: 1px solid var(--border2);
  background: var(--dark3); color: var(--off);
  cursor: pointer; white-space: nowrap; flex-shrink: 0;
  transition: all 0.15s;
}
.copy-btn:hover { border-color: var(--accent); color: var(--accent); }
.copy-btn.copied { color: var(--teal); border-color: var(--teal-bd); }

code {
  font-family: 'JetBrains Mono', monospace; font-size: 13px;
  color: var(--code-tint-col);
  background: var(--code-tint-bg);
  border: 1px solid var(--code-tint-bd);
  padding: 1px 5px; border-radius: 3px;
}

/* ── CALLOUTS ── */
.callout {
  border-radius: var(--radius-sm); padding: 12px 15px;
  font-size: 14px; line-height: 1.7; margin-bottom: 1rem;
  border-left: 2px solid transparent;
}
.callout.tip     { background: var(--accent-bg); border-left-color: var(--accent); color: var(--tip-text); }
.callout.warn    { background: var(--amber-bg); border-left-color: var(--amber); color: var(--warn-text); }
.callout.success { background: var(--teal-bg); border-left-color: var(--teal); color: var(--success-text); }
.callout.danger  { background: var(--red-bg); border-left-color: var(--red); color: var(--danger-text); }
.callout strong  { color: var(--white); font-weight: 600; }
.callout code    { font-size: 12px; }

/* ── DIVIDER ── */
.divider { height: 1px; background: var(--border); margin: 1.5rem 0; }

/* ── CHEAT GRID ── */
.cheat-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px;
  margin-bottom: 1rem;
}
.cheat-card {
  background: var(--dark2); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 12px 14px;
  transition: border-color 0.15s;
}
.cheat-card:hover { border-color: var(--border2); }
.cheat-cmd {
  font-family: 'JetBrains Mono', monospace; font-size: 13px; font-weight: 500;
  color: var(--accent); margin-bottom: 4px;
}
.cheat-desc { font-size: 13px; color: var(--muted); line-height: 1.5; }

/* ── TWO COL ── */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 1rem; }
.mini-card {
  background: var(--dark2); border-radius: var(--radius-sm);
  padding: 14px; border: 1px solid var(--border);
}
.mini-title { font-size: 13px; font-weight: 700; margin-bottom: 8px; color: var(--white); }
.mini-body  { font-size: 13px; color: var(--muted); line-height: 1.65; }
.mini-body strong { color: var(--off); font-weight: 500; }

/* ── PROMPT EXAMPLES ── */
.prompt-row {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 10px;
  background: var(--dark3); border-radius: var(--radius-sm);
  padding: 10px 12px; margin-bottom: 7px;
  font-size: 14px; line-height: 1.65; color: var(--off);
  border: 1px solid var(--border);
}
.prompt-row:last-child { margin-bottom: 0; }
.prompt-row.muted { color: var(--muted); }
.ptag {
  font-size: 11px; font-weight: 700; letter-spacing: 0.04em;
  padding: 2px 8px; border-radius: 20px;
  white-space: nowrap; flex-shrink: 0; margin-top: 2px;
}
.ptag.good     { background: var(--teal-bg);  color: var(--teal); border: 1px solid var(--teal-bd); }
.ptag.bad      { background: var(--red-bg);   color: var(--red);  border: 1px solid var(--red-bd); }
.ptag.terminal { background: var(--accent-bg); color: var(--accent); border: 1px solid var(--accent-bd); }
.ptag.info     { background: var(--blue-bg); color: var(--blue); border: 1px solid var(--blue-bd); }

/* ── FORMULA ── */
.formula-box {
  border: 1px solid var(--border2);
  background: var(--dark2);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem; margin-bottom: 1rem;
}
.formula-title { font-size: 14px; font-weight: 600; color: var(--white); margin-bottom: 12px; }
.formula { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-bottom: 10px; }
.f-part { padding: 5px 14px; border-radius: 20px; font-size: 13px; font-weight: 600; }
.f-ctx  { background: var(--blue-bg); color: var(--blue); border: 1px solid var(--blue-bd); }
.f-act  { background: var(--accent-bg); color: var(--accent); border: 1px solid var(--accent-bd); }
.f-fmt  { background: var(--teal-bg); color: var(--teal); border: 1px solid var(--teal-bd); }
.f-plus { color: var(--muted); font-size: 16px; }
.formula-desc { font-size: 13px; color: var(--muted); line-height: 1.6; margin-top: 8px; }

/* ── ASK CLAUDE CALLOUT ── */
.ask-claude-box {
  background: linear-gradient(135deg, var(--accent-bg) 0%, var(--teal-bg) 100%);
  border: 1px solid var(--accent-bd2);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}
.ask-claude-header { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.ask-icon {
  width: 34px; height: 34px; border-radius: 8px;
  background: var(--accent-bg2);
  border: 1px solid var(--accent-bd2);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.ask-claude-title { font-size: 15px; font-weight: 700; color: var(--white); }
.ask-claude-sub   { font-size: 12px; color: var(--muted); margin-top: 1px; }
.ask-claude-body  { font-size: 14px; color: var(--off); line-height: 1.75; }
.prompt-chip-row  { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 12px; }
.prompt-chip {
  font-size: 12px; font-family: 'JetBrains Mono', monospace;
  background: var(--dark3); border: 1px solid var(--border2);
  color: var(--off); padding: 5px 10px; border-radius: var(--radius-sm);
  cursor: pointer; transition: all 0.15s;
}
.prompt-chip:hover { border-color: var(--accent); color: var(--accent); }
.chip-label { font-size: 12px; color: var(--muted); margin-top: 8px; }

/* ── VISUAL TIP CARDS ── */
.visual-tips { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 1rem 0; }
.vtip {
  background: var(--dark2); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 14px;
}
.vtip-icon  { font-size: 22px; margin-bottom: 8px; }
.vtip-title { font-size: 13px; font-weight: 700; color: var(--white); margin-bottom: 4px; }
.vtip-body  { font-size: 13px; color: var(--muted); line-height: 1.6; }

/* ── SKILL STEPS ── */
.skill-step { display: flex; gap: 14px; margin-bottom: 16px; align-items: flex-start; }
.skill-step:last-child { margin-bottom: 0; }
.skill-num {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--accent-bg);
  border: 1px solid var(--accent-bd2);
  color: var(--accent); font-size: 12px; font-weight: 700;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.skill-content { flex: 1; font-size: 15px; color: var(--off); line-height: 1.7; }
.skill-content p { margin-top: 4px; font-size: 15px; }
.skill-title { font-size: 15px; font-weight: 600; color: var(--white); }
.skill-content strong { color: var(--white); font-weight: 600; }

/* ── ASSIGNMENT ── */
.assignment-hero {
  background: var(--dark2);
  border: 1px solid var(--border2);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}
.assignment-tag {
  font-size: 11px; font-weight: 700; letter-spacing: 0.07em;
  background: var(--accent-bg2); color: var(--accent);
  border: 1px solid var(--accent-bd2);
  padding: 3px 10px; border-radius: 20px;
  display: inline-block; margin-bottom: 12px;
}

/* ── TASK LIST ── */
.task-list { list-style: none; }
.task-item {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  font-size: 15px; line-height: 1.65;
}
.task-item:last-child { border-bottom: none; }
.task-check {
  width: 20px; height: 20px; border-radius: 4px;
  border: 1px solid var(--border2); background: var(--dark3);
  flex-shrink: 0; margin-top: 2px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.15s;
}
.task-check:hover { border-color: var(--accent); }
.task-check.checked { background: var(--accent); border-color: var(--accent); }
.task-check.checked svg { display: block; }
.task-check svg { display: none; width: 12px; height: 12px; }
.task-content { flex: 1; }
.task-title   { font-weight: 600; color: var(--white); margin-bottom: 3px; font-size: 15px; }
.task-desc    { font-size: 13px; color: var(--muted); line-height: 1.65; }
.task-tag {
  display: inline-block; font-size: 10px; font-weight: 700;
  letter-spacing: 0.04em; padding: 2px 8px; border-radius: 20px; margin-top: 6px;
}
.task-tag.install   { background: var(--teal-bg); color: var(--teal); border: 1px solid var(--teal-bd); }
.task-tag.understand { background: var(--blue-bg); color: var(--blue); border: 1px solid var(--blue-bd); }
.task-tag.edit      { background: var(--accent-bg); color: var(--accent); border: 1px solid var(--accent-bd); }
.task-tag.setup     { background: var(--teal-bg); color: var(--teal); border: 1px solid var(--teal-bd); }
.task-tag.verify    { background: var(--blue-bg); color: var(--blue); border: 1px solid var(--blue-bd); }
.task-tag.apply     { background: var(--accent-bg); color: var(--accent); border: 1px solid var(--accent-bd); }
.task-tag.try       { background: var(--accent-bg); color: var(--accent); border: 1px solid var(--accent-bd); }
.task-tag.compare   { background: var(--blue-bg); color: var(--blue); border: 1px solid var(--blue-bd); }
.task-tag.build     { background: var(--teal-bg); color: var(--teal); border: 1px solid var(--teal-bd); }

/* ── HINT BOX ── */
.hint-box {
  background: var(--dark3); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 12px 14px;
  margin-top: 12px;
}
.hint-title {
  font-size: 11px; font-weight: 700; color: var(--accent);
  letter-spacing: 0.05em; margin-bottom: 8px; text-transform: uppercase;
}
.hint-prompt {
  font-family: 'JetBrains Mono', monospace; font-size: 12px;
  color: var(--off); line-height: 1.7;
  background: var(--code-surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 10px 12px;
  margin-bottom: 6px;
}
.hint-prompt:last-child { margin-bottom: 0; }

/* ── COMPLETE BOX ── */
.complete-box {
  background: var(--teal-bg);
  border: 1px solid var(--teal-bd);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  text-align: center; margin-top: 1.5rem;
  display: none;
}
.complete-box.show { display: block; animation: fadeUp 0.3s ease; }
.complete-box h3 { font-size: 17px; font-weight: 700; color: var(--teal); margin-bottom: 6px; }
.complete-box p  { font-size: 14px; color: var(--success-text); }

.progress-counter { font-size: 12px; color: var(--muted); margin-top: 8px; text-align: right; }

/* ── NAV BUTTONS ── */
.nav-row {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 2rem; padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}
.nav-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 18px; border-radius: var(--radius-sm);
  border: 1px solid var(--border2);
  background: transparent; color: var(--off);
  font-family: 'Inter', sans-serif; font-size: 14px; font-weight: 500;
  cursor: pointer; text-decoration: none;
  transition: all 0.15s;
}
.nav-btn:hover { background: var(--dark2); color: var(--white); text-decoration: none; }
.nav-btn.primary {
  background: var(--accent); border-color: var(--accent);
  color: #0d0d0d; font-weight: 700;
}
.nav-btn.primary:hover { background: var(--accent2); border-color: var(--accent2); }
.nav-btn:disabled { opacity: 0.3; pointer-events: none; }
.step-counter { font-size: 12px; color: var(--muted); }

/* ── OS TAB TOGGLE ── */
.os-tabs {
  display: flex;
  gap: 3px;
  background: var(--dark3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 3px;
  margin-bottom: 1.75rem;
  width: fit-content;
}
.os-tab {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 18px;
  border-radius: 6px;
  border: none;
  background: transparent;
  color: var(--off);
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}
.os-tab:hover { color: var(--white); }
.os-tab.active {
  background: var(--dark2);
  color: var(--white);
  box-shadow: 0 1px 4px rgba(0,0,0,0.35);
}
.os-panel { display: none; }
.os-panel.active { display: block; }

/* ── TIER ROWS (security module) ── */
.tier-row {
  display: flex; align-items: flex-start; gap: 14px;
  padding: 14px; border-radius: var(--radius-sm);
  margin-bottom: 8px; border: 1px solid transparent;
}
.tier-row.green  { background: var(--teal-bg); border-color: var(--teal-bd); }
.tier-row.yellow { background: var(--amber-bg); border-color: var(--amber-bd); }
.tier-row.red    { background: var(--red-bg); border-color: var(--red-bd); }
.tier-badge {
  font-size: 10px; font-weight: 700; letter-spacing: 0.05em;
  padding: 3px 10px; border-radius: 20px;
  white-space: nowrap; flex-shrink: 0; margin-top: 2px;
}
.tier-badge.green  { background: rgba(41,98,255,0.15); color: var(--teal); border: 1px solid var(--teal-bd); }
.tier-badge.yellow { background: rgba(245,158,11,0.15); color: var(--amber); border: 1px solid var(--amber-bd); }
.tier-badge.red    { background: rgba(248,113,113,0.15); color: var(--red); border: 1px solid var(--red-bd); }
.tier-body { font-size: 14px; color: var(--off); line-height: 1.65; }
.tier-body strong { color: var(--white); }

/* ── SCENARIO CARDS ── */
.scenario-card {
  background: var(--dark3); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 14px 16px; margin-bottom: 8px;
}
.scenario-label {
  font-size: 10px; font-weight: 700; letter-spacing: 0.05em;
  color: var(--red); text-transform: uppercase; margin-bottom: 6px;
}
.scenario-text { font-size: 14px; color: var(--off); line-height: 1.65; margin-bottom: 8px; }
.scenario-why {
  font-size: 13px; color: var(--muted); line-height: 1.55;
  border-top: 1px solid var(--border); padding-top: 8px;
}
.scenario-why strong { color: var(--amber); }

/* ── SEVERITY BADGES ── */
.severity-badge {
  font-size: 10px; font-weight: 700; letter-spacing: 0.05em;
  padding: 3px 10px; border-radius: 20px;
  white-space: nowrap; flex-shrink: 0; margin-top: 2px; text-transform: uppercase;
}
.severity-badge.low    { background: var(--blue-bg); color: var(--blue); border: 1px solid var(--blue-bd); }
.severity-badge.medium { background: var(--amber-bg); color: var(--amber); border: 1px solid var(--amber-bd); }
.severity-badge.high   { background: var(--red-bg); color: var(--red); border: 1px solid var(--red-bd); }

/* ── FOOTER ── */
.divider-footer { height: 1px; background: var(--border); margin: 2rem 0; }
.footer-note { font-size: 13px; color: var(--muted); text-align: center; line-height: 1.7; }
.footer-note a { color: var(--off); text-decoration: none; border-bottom: 1px solid var(--border2); }
.footer-note a:hover { color: var(--white); }
.footer-internal { font-size: 11px; color: var(--muted); opacity: 0.7; display: block; margin-top: 4px; }

/* ── RESOURCE CARDS ── */
.resources-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
  margin-bottom: 2rem;
}
.resource-card {
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  display: flex; flex-direction: column; gap: 10px;
  transition: border-color 0.15s, transform 0.15s;
}
.resource-card:hover { border-color: var(--border2); transform: translateY(-1px); }
.resource-icon {
  font-size: 28px;
  margin-bottom: 2px;
}
.resource-name {
  font-size: 16px; font-weight: 700; color: var(--white);
}
.resource-what {
  font-size: 14px; color: var(--off); line-height: 1.6;
}
.resource-why {
  font-size: 13px; color: var(--muted); line-height: 1.6;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}
.resource-why strong { color: var(--off); }
.resource-link {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: auto; padding-top: 4px;
  font-size: 13px; font-weight: 600; color: var(--accent);
  text-decoration: none;
  transition: opacity 0.15s;
}
.resource-link:hover { opacity: 0.8; text-decoration: none; }
.resource-link svg { flex-shrink: 0; }

/* ── FULL-WIDTH RESOURCE CARD (Drive) ── */
.resource-card.wide {
  grid-column: 1 / -1;
  flex-direction: row;
  align-items: center;
  gap: 20px;
}
.resource-card.wide .resource-body { flex: 1; }
.resource-card.wide .resource-icon { font-size: 36px; flex-shrink: 0; }

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .resource-card.wide { flex-direction: column; }
}
@media (max-width: 600px) {
  .modules-grid { grid-template-columns: 1fr; }
  .resources-grid { grid-template-columns: 1fr; }
  .two-col, .cheat-grid, .visual-tips { grid-template-columns: 1fr; }
  h1 { font-size: 24px; }
  .hero h1 { font-size: 26px; }
  .site-header { padding: 10px 1rem; }
  .wrapper { padding: 1.5rem 1rem; }
  .breadcrumb { display: none; }
  .module-counter { display: none; }
}