/* ===== CompTIA Security+ SY0-701 Study Hub — Shared Styles ===== */

:root {
  --bg: #0d1117;
  --bg2: #161b22;
  --bg3: #21262d;
  --border: #30363d;
  --accent: #58a6ff;
  --accent2: #3fb950;
  --accent3: #f78166;
  --accent4: #d2a8ff;
  --accent5: #ffa657;
  --text: #e6edf3;
  --text2: #8b949e;
  --text3: #c9d1d9;
  --success: #238636;
  --warning: #9e6a03;
  --danger: #da3633;
  --radius: 10px;
  --shadow: 0 4px 24px rgba(0,0,0,0.5);
}

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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
}

/* ===== Header ===== */
header {
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.05rem;
}

.logo .shield { font-size: 1.4rem; }

nav { display: flex; gap: 0.4rem; flex-wrap: wrap; }

nav a {
  color: var(--text2);
  text-decoration: none;
  padding: 0.3rem 0.7rem;
  border-radius: 6px;
  font-size: 0.85rem;
  transition: all 0.2s;
}

nav a:hover, nav a.active {
  color: var(--accent);
  background: rgba(88,166,255,0.1);
}

/* ===== Page Hero ===== */
.hero {
  background: linear-gradient(135deg, var(--bg2) 0%, #1a2030 100%);
  border-bottom: 1px solid var(--border);
  padding: 3rem 2rem;
  text-align: center;
}

.hero .badge {
  display: inline-block;
  background: rgba(88,166,255,0.15);
  color: var(--accent);
  border: 1px solid rgba(88,166,255,0.3);
  padding: 0.25rem 0.9rem;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 0.6rem;
  background: linear-gradient(135deg, var(--text) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  color: var(--text2);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ===== Main Content ===== */
main { max-width: 1100px; margin: 0 auto; padding: 2.5rem 2rem; }

/* ===== Cards Grid ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: all 0.25s;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent4));
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.card .chapter-num {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.card h3 { font-size: 1.15rem; margin-bottom: 0.5rem; }
.card p { color: var(--text2); font-size: 0.9rem; margin-bottom: 1.2rem; }

.card-links { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.9rem;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

.btn-primary { background: var(--accent); color: #0d1117; }
.btn-primary:hover { background: #79c0ff; }

.btn-outline {
  background: transparent;
  color: var(--text2);
  border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.btn-success { background: var(--accent2); color: #0d1117; }
.btn-success:hover { background: #56d364; }

.btn-purple { background: var(--accent4); color: #0d1117; }
.btn-purple:hover { filter: brightness(1.1); }

.btn-orange { background: var(--accent5); color: #0d1117; }
.btn-orange:hover { filter: brightness(1.1); }

.btn-danger { background: var(--accent3); color: #0d1117; }
.btn-danger:hover { filter: brightness(1.1); }

/* ===== Section Headers ===== */
.section-header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1.5rem;
}

.section-header h2 { font-size: 1.4rem; }

.tag {
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
}

.tag-blue { background: rgba(88,166,255,0.15); color: var(--accent); }
.tag-green { background: rgba(63,185,80,0.15); color: var(--accent2); }
.tag-purple { background: rgba(210,168,255,0.15); color: var(--accent4); }
.tag-orange { background: rgba(255,166,87,0.15); color: var(--accent5); }
.tag-red { background: rgba(247,129,102,0.15); color: var(--accent3); }

/* ===== Page Nav (sub-page links) ===== */
.page-nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding: 1rem 2rem;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
}

.page-nav a {
  color: var(--text2);
  text-decoration: none;
  padding: 0.35rem 0.8rem;
  border-radius: 6px;
  font-size: 0.85rem;
  border: 1px solid transparent;
  transition: all 0.2s;
}

.page-nav a:hover { color: var(--accent); border-color: var(--accent); }
.page-nav a.active { color: var(--accent); border-color: var(--accent); background: rgba(88,166,255,0.08); }

/* ===== Story / Learning Text ===== */
.story-container { max-width: 800px; margin: 0 auto; }

.story-scene {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 1.5rem;
  position: relative;
}

.story-scene::before {
  content: attr(data-label);
  position: absolute;
  top: -12px; left: 20px;
  background: var(--bg);
  color: var(--accent);
  padding: 0 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.story-scene h3 { color: var(--accent4); margin-bottom: 0.8rem; font-size: 1.05rem; }
.story-scene p { color: var(--text3); margin-bottom: 0.8rem; }
.story-scene p:last-child { margin-bottom: 0; }

.callout {
  background: rgba(88,166,255,0.08);
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1rem 1.2rem;
  margin: 1rem 0;
  color: var(--text3);
}

.callout.success { background: rgba(63,185,80,0.08); border-color: var(--accent2); }
.callout.warning { background: rgba(255,166,87,0.08); border-color: var(--accent5); }
.callout.danger { background: rgba(247,129,102,0.08); border-color: var(--accent3); }

.callout strong { display: block; margin-bottom: 0.3rem; }

/* ===== Key Points Box ===== */
.key-points {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.key-points h4 {
  color: var(--accent2);
  margin-bottom: 1rem;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.key-points ul { list-style: none; }

.key-points li {
  padding: 0.4rem 0;
  color: var(--text3);
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.95rem;
}

.key-points li::before { content: '→'; color: var(--accent2); flex-shrink: 0; }

/* ===== Flashcards ===== */
.flashcard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.2rem;
  margin-top: 1.5rem;
}

.flashcard {
  height: 200px;
  perspective: 1000px;
  cursor: pointer;
}

.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.55s cubic-bezier(0.4, 0.2, 0.2, 1);
}

.flashcard.flipped .flashcard-inner { transform: rotateY(180deg); }

.flashcard-front, .flashcard-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  text-align: center;
  border: 1px solid var(--border);
}

.flashcard-front {
  background: var(--bg2);
  border-top: 3px solid var(--accent);
}

.flashcard-back {
  background: var(--bg3);
  border-top: 3px solid var(--accent2);
  transform: rotateY(180deg);
}

.flashcard-front .term {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.flashcard-front .hint {
  font-size: 0.78rem;
  color: var(--text2);
}

.flashcard-back .def {
  font-size: 0.88rem;
  color: var(--text3);
  line-height: 1.6;
}

/* ===== Quiz ===== */
.quiz-section {
  margin-bottom: 2.5rem;
}

.quiz-section h3 {
  color: var(--accent4);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 1.2rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.question-block {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.2rem;
}

.question-text {
  font-size: 0.97rem;
  color: var(--text3);
  margin-bottom: 1.2rem;
  font-weight: 500;
}

.question-num {
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 0.4rem;
  text-transform: uppercase;
}

.options { display: flex; flex-direction: column; gap: 0.6rem; }

.option {
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
  padding: 0.7rem 1rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg3);
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.9rem;
  color: var(--text3);
}

.option:hover { border-color: var(--accent); color: var(--text); }
.option input { margin-top: 2px; flex-shrink: 0; accent-color: var(--accent); }

.option.correct { border-color: var(--accent2) !important; background: rgba(63,185,80,0.1) !important; color: var(--text) !important; }
.option.incorrect { border-color: var(--accent3) !important; background: rgba(247,129,102,0.1) !important; }

.answer-reveal {
  margin-top: 1rem;
  padding: 0.8rem 1rem;
  background: rgba(88,166,255,0.08);
  border-radius: 6px;
  font-size: 0.88rem;
  color: var(--text2);
  display: none;
}

.answer-reveal.visible { display: block; }

.quiz-explanation {
  margin-top: 1rem;
  padding: 0.8rem 1rem;
  background: rgba(88,166,255,0.08);
  border-radius: 6px;
  font-size: 0.88rem;
  color: var(--text2);
  display: none;
}

.quiz-explanation.visible { display: block; }

/* Matching */
.matching-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

.match-item {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.7rem 1rem;
  font-size: 0.88rem;
  cursor: pointer;
  transition: all 0.2s;
  color: var(--text3);
}

.match-item:hover { border-color: var(--accent4); }
.match-item.selected { border-color: var(--accent4); background: rgba(210,168,255,0.1); color: var(--text); }
.match-item.matched { border-color: var(--accent2); background: rgba(63,185,80,0.1); color: var(--text); pointer-events: none; }

/* ===== Tricks page ===== */
.trick-block {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.2rem;
  border-left: 4px solid var(--accent5);
}

.trick-block h4 {
  color: var(--accent5);
  font-size: 0.95rem;
  margin-bottom: 0.7rem;
}

.trick-block p { color: var(--text3); font-size: 0.92rem; }

.spoiler-btn {
  margin-top: 1rem;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text2);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.2s;
  width: 100%;
  text-align: left;
}

.spoiler-btn:hover { border-color: var(--accent5); color: var(--accent5); }

.spoiler-content {
  margin-top: 0.8rem;
  padding: 0.8rem 1rem;
  background: rgba(255,166,87,0.08);
  border-radius: 6px;
  font-size: 0.88rem;
  color: var(--text3);
  display: none;
}

.spoiler-content.visible { display: block; }

/* ===== Glossary ===== */
.glossary-search {
  width: 100%;
  padding: 0.8rem 1.2rem;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  outline: none;
  transition: border-color 0.2s;
}

.glossary-search:focus { border-color: var(--accent); }

.glossary-item {
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
}

.glossary-item:last-child { border-bottom: none; }

.glossary-term {
  font-weight: 700;
  color: var(--accent);
  font-size: 1rem;
  margin-bottom: 0.3rem;
}

.glossary-def {
  color: var(--text3);
  font-size: 0.92rem;
}

/* ===== Examples page ===== */
.example-block {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.2rem;
}

.example-block h4 {
  color: var(--accent);
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.scenario-label {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  margin-bottom: 0.8rem;
}

.scenario-label.real { background: rgba(63,185,80,0.15); color: var(--accent2); }
.scenario-label.breach { background: rgba(247,129,102,0.15); color: var(--accent3); }
.scenario-label.exam { background: rgba(88,166,255,0.15); color: var(--accent); }

/* ===== Concepts page ===== */
.concept-map {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
  padding: 2rem 0;
}

.concept-node {
  background: var(--bg2);
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 1.2rem;
  min-width: 180px;
  max-width: 220px;
  text-align: center;
  position: relative;
  transition: all 0.2s;
}

.concept-node:hover { border-color: var(--accent); transform: scale(1.03); }

.concept-node .node-icon { font-size: 2rem; margin-bottom: 0.5rem; }
.concept-node h4 { font-size: 0.9rem; color: var(--text); margin-bottom: 0.3rem; }
.concept-node p { font-size: 0.78rem; color: var(--text2); }

.relation-line {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text2);
  font-size: 1.2rem;
}

/* ===== Helper link bar ===== */
.helper-bar {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-top: 2.5rem;
}

.helper-bar h4 {
  color: var(--text2);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 1rem;
}

.helper-bar .helper-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

/* ===== Progress bar ===== */
.progress-bar {
  height: 6px;
  background: var(--bg3);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 1rem;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent4));
  border-radius: 3px;
  transition: width 0.4s ease;
}

/* ===== Score display ===== */
.score-display {
  text-align: center;
  padding: 2rem;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-top: 2rem;
  display: none;
}

.score-display.visible { display: block; }
.score-num { font-size: 3rem; font-weight: 800; color: var(--accent); }
.score-label { color: var(--text2); font-size: 0.9rem; margin-top: 0.3rem; }

/* ===== Footer ===== */
footer {
  margin-top: 4rem;
  padding: 2rem;
  text-align: center;
  color: var(--text2);
  font-size: 0.82rem;
  border-top: 1px solid var(--border);
}

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

/* ===== Responsive ===== */
@media (max-width: 700px) {
  header { padding: 0 1rem; }
  main { padding: 1.5rem 1rem; }
  .hero { padding: 2rem 1rem; }
  .page-nav { padding: 0.8rem 1rem; }
  .matching-grid { grid-template-columns: 1fr; }
  nav { display: none; }
}

/* ===== Utility ===== */
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-2 { margin-bottom: 1rem; }
.text-center { text-align: center; }
.text-muted { color: var(--text2); }
.flex-gap { display: flex; gap: 1rem; flex-wrap: wrap; }
.hidden { display: none; }