/* ============================================================
   STYLES.CSS — C-Family Ultimate Reference Website Design System
   ============================================================ */

:root {
  --bg:        #0a0b0f;
  --bg2:       #10121a;
  --bg3:       #161925;
  --bg-card-head: #141724;
  --border:    #1e2235;
  --border2:   #2a2f4a;
  --border3:   #3a4268;
  --text:      #e2e6ff;
  --text-dim:  #a5accb;
  --muted:     #6b7094;
  --accent1:   #7c6aff;
  --accent2:   #00d4ff;
  --accent3:   #ff6b9d;
  --accent4:   #ffd166;
  --accent5:   #06d6a0;
  --red:       #ff4757;
  --orange:    #ff7c43;
  --green:     #06d6a0;

  /* Level Colors */
  --lvl1: #06d6a0;
  --lvl2: #00d4ff;
  --lvl3: #7c6aff;
  --lvl4: #ff6b9d;
  --lvl5: #ffd166;
  --lvl6: #ff4757;

  /* Language Branding */
  --c-color:   #00d4ff;
  --cpp-color: #0075c9;
  --cpp-glow:  #00d4ff;
  --cs-color:  #b388ff;
  --cs-glow:   #ff6b9d;
}

/* Page Theme Overrides */
body.theme-cpp {
  --accent1: #00d4ff;
  --accent2: #7c6aff;
  --accent3: #ff6b9d;
}

body.theme-cs {
  --accent1: #b388ff;
  --accent2: #ff6b9d;
  --accent3: #ffd166;
}

body.theme-compare {
  --accent1: #00d4ff;
  --accent2: #b388ff;
  --accent3: #06d6a0;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* ── GLOBAL TOP NAVIGATION ── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 11, 15, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border2);
  padding: 10px 24px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 20px;
  transition: all .2s ease;
}

.nav-links {
  display: flex;
  grid-column: 2;
  justify-self: center;
  align-items: center;
  gap: 8px;
  list-style: none;
  flex-wrap: wrap;
}

.nav-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 8px;
  font-size: .82rem;
  font-weight: 600;
  color: var(--text-dim);
  text-decoration: none;
  border: 1px solid transparent;
  transition: all .15s ease;
}

.nav-item:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--border2);
  transform: translateY(-1px);
}

.nav-item.active {
  color: #fff;
  background: rgba(124, 106, 255, 0.15);
  border-color: rgba(124, 106, 255, 0.4);
  box-shadow: 0 0 16px rgba(124, 106, 255, 0.2);
}

.nav-item.tab-c.active {
  background: rgba(6, 214, 160, 0.12);
  border-color: rgba(6, 214, 160, 0.4);
  color: #06d6a0;
  box-shadow: 0 0 16px rgba(6, 214, 160, 0.25);
}

.nav-item.tab-cpp.active {
  background: rgba(0, 212, 255, 0.12);
  border-color: rgba(0, 212, 255, 0.4);
  color: #00d4ff;
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.25);
}

.nav-item.tab-cs.active {
  background: rgba(179, 136, 255, 0.12);
  border-color: rgba(179, 136, 255, 0.4);
  color: #b388ff;
  box-shadow: 0 0 16px rgba(179, 136, 255, 0.25);
}

.nav-search-container {
  display: flex;
  grid-column: 3;
  justify-self: end;
  align-items: center;
  position: relative;
  min-width: 240px;
}

.nav-search-input {
  width: 100%;
  background: var(--bg2);
  border: 1px solid var(--border2);
  color: var(--text);
  font-family: inherit;
  font-size: .8rem;
  padding: 7px 32px 7px 12px;
  border-radius: 8px;
  outline: none;
  transition: all .2s;
}

.nav-search-input:focus {
  border-color: var(--accent1);
  box-shadow: 0 0 12px rgba(124, 106, 255, 0.3);
  background: var(--bg3);
}

.nav-search-input::placeholder {
  color: var(--muted);
}

.search-shortcut-hint {
  position: absolute;
  right: 8px;
  font-size: .68rem;
  font-weight: 700;
  color: var(--muted);
  background: var(--bg3);
  border: 1px solid var(--border);
  padding: 2px 5px;
  border-radius: 4px;
  pointer-events: none;
}

/* ── HEADER / HERO ── */
.hero {
  background: linear-gradient(135deg, #0a0b0f 0%, #0d1124 40%, #0a0f1e 100%);
  border-bottom: 1px solid var(--border2);
  padding: 56px 24px 44px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(124,106,255,.18) 0%, transparent 70%);
  pointer-events: none;
}

.theme-cpp .hero::before {
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(0,212,255,.18) 0%, transparent 70%);
}

.theme-cs .hero::before {
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(179,136,255,.18) 0%, transparent 70%);
}

.theme-compare .hero::before {
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(255,107,157,.15) 0%, transparent 70%);
}

.hero-badge {
  display: inline-block;
  background: rgba(124,106,255,.15);
  border: 1px solid rgba(124,106,255,.4);
  color: var(--accent1);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: 5px 14px;
  border-radius: 100px;
  margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.15;
  background: linear-gradient(135deg, #fff 30%, var(--accent1) 70%, var(--accent2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 14px;
}
.hero p {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 680px;
  margin: 0 auto 24px;
  line-height: 1.6;
}

/* level pills */
.level-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 10px;
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 100px;
  font-size: .78rem;
  font-weight: 600;
  border: 1px solid;
  cursor: pointer;
  transition: transform .15s, box-shadow .15s, filter .15s;
  text-decoration: none;
}
.pill:hover { transform: translateY(-2px); box-shadow: 0 4px 20px rgba(0,0,0,.4); filter: brightness(1.15); }
.pill-1 { color: var(--lvl1); border-color: rgba(6,214,160,.3); background: rgba(6,214,160,.08); }
.pill-2 { color: var(--lvl2); border-color: rgba(0,212,255,.3); background: rgba(0,212,255,.08); }
.pill-3 { color: var(--lvl3); border-color: rgba(124,106,255,.3); background: rgba(124,106,255,.08); }
.pill-4 { color: var(--lvl4); border-color: rgba(255,107,157,.3); background: rgba(255,107,157,.08); }
.pill-5 { color: var(--lvl5); border-color: rgba(255,209,102,.3); background: rgba(255,209,102,.08); }
.pill-6 { color: var(--lvl6); border-color: rgba(255,71,87,.3); background: rgba(255,71,87,.08); }

/* Quick Search Status Bar */
.search-results-bar {
  display: none;
  max-width: 1300px;
  margin: 20px auto 0;
  padding: 10px 18px;
  background: var(--bg2);
  border: 1px solid var(--border2);
  border-radius: 10px;
  align-items: center;
  justify-content: space-between;
  font-size: .85rem;
  color: var(--text-dim);
}
.search-results-bar.active { display: flex; }
.search-clear-btn {
  background: none;
  border: 1px solid var(--border2);
  color: var(--muted);
  cursor: pointer;
  padding: 3px 10px;
  border-radius: 6px;
  font-size: .75rem;
  transition: all .15s;
}
.search-clear-btn:hover { color: #fff; border-color: var(--accent1); }

/* ── LAYOUT ── */
.wrapper {
  max-width: 1300px;
  margin: 0 auto;
  padding: 20px 20px 80px;
}

/* ── SECTION HEADER ── */
.section-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 56px 0 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border2);
}
.section-num {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-size: 1.05rem;
  font-weight: 900;
  flex-shrink: 0;
}
.s1 .section-num { background: rgba(6,214,160,.15);  color: var(--lvl1); }
.s2 .section-num { background: rgba(0,212,255,.15);  color: var(--lvl2); }
.s3 .section-num { background: rgba(124,106,255,.15); color: var(--lvl3); }
.s4 .section-num { background: rgba(255,107,157,.15); color: var(--lvl4); }
.s5 .section-num { background: rgba(255,209,102,.15); color: var(--lvl5); }
.s6 .section-num { background: rgba(255,71,87,.15);   color: var(--lvl6); }

.section-title { font-size: 1.5rem; font-weight: 800; }
.section-label {
  margin-left: auto;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 100px;
  border: 1px solid;
  flex-shrink: 0;
}
.s1 .section-label { color: var(--lvl1); border-color: rgba(6,214,160,.3); background: rgba(6,214,160,.08); }
.s2 .section-label { color: var(--lvl2); border-color: rgba(0,212,255,.3); background: rgba(0,212,255,.08); }
.s3 .section-label { color: var(--lvl3); border-color: rgba(124,106,255,.3); background: rgba(124,106,255,.08); }
.s4 .section-label { color: var(--lvl4); border-color: rgba(255,107,157,.3); background: rgba(255,107,157,.08); }
.s5 .section-label { color: var(--lvl5); border-color: rgba(255,209,102,.3); background: rgba(255,209,102,.08); }
.s6 .section-label { color: var(--lvl6); border-color: rgba(255,71,87,.3); background: rgba(255,71,87,.08); }

/* ── GRID ── */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(420px, 1fr));
  gap: 20px;
}
.grid.wide { grid-template-columns: 1fr; }

/* ── CARD ── */
.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color .2s, transform .2s, box-shadow .2s;
}
.card:hover {
  border-color: var(--border2);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,0,0,.45);
}
.card.card-highlight {
  border-color: var(--accent1);
  box-shadow: 0 0 20px rgba(124, 106, 255, 0.2);
}
.card.hidden {
  display: none !important;
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 13px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--bg3);
}
.card-head-left {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}
.card-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
}
.card-title {
  font-size: .88rem;
  font-weight: 700;
  color: #c8cef5;
  letter-spacing: .02em;
  white-space: normal;
  line-height: 1.35;
}
.card-body {
  padding: 0;
  display: flex;
  flex-direction: column;
  flex: 1;
}

/* ── CODE BLOCK & WRAPPER ── */
.code-wrap {
  position: relative;
  background: #0d0f16;
}
pre {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: .78rem;
  line-height: 1.75;
  padding: 18px 20px;
  overflow-x: auto;
  tab-size: 4;
  white-space: pre;
}

/* Copy Button */
.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(22, 25, 37, 0.85);
  border: 1px solid var(--border2);
  color: var(--muted);
  font-family: 'Inter', sans-serif;
  font-size: .7rem;
  font-weight: 600;
  padding: 4px 9px;
  border-radius: 6px;
  cursor: pointer;
  opacity: 0;
  transition: opacity .15s ease, background .15s, color .15s, border-color .15s;
  backdrop-filter: blur(4px);
  z-index: 10;
}
.code-wrap:hover .copy-btn {
  opacity: 1;
}
.copy-btn:hover {
  background: var(--bg3);
  color: #fff;
  border-color: var(--accent1);
}
.copy-btn.copied {
  opacity: 1;
  color: var(--green);
  border-color: var(--green);
  background: rgba(6, 214, 160, 0.15);
}

/* Syntax highlight classes */
.kw  { color: #7c6aff; font-weight: 700; }   /* keywords */
.ty  { color: #00d4ff; }                      /* types */
.fn  { color: #ffd166; }                      /* function names */
.cm  { color: #4a5280; font-style: italic; }  /* comments */
.cm.hot { color: #6b7094; }                   /* brighter comments */
.st  { color: #06d6a0; }                      /* strings */
.nm  { color: #ff9f7e; }                      /* numbers */
.pp  { color: #ff6b9d; }                      /* preprocessor / attributes */
.op  { color: #e2e6ff; }                      /* operators/punct */
.va  { color: #e2e6ff; }                      /* variables */
.prop { color: #ff6b9d; }                     /* properties / members */

/* callout inside card */
.callout {
  margin: 12px 18px 16px;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: .8rem;
  border-left: 3px solid;
  line-height: 1.5;
}
.callout.info { background: rgba(0,212,255,.06); border-color: var(--accent2); color: #94d8f5; }
.callout.warn { background: rgba(255,209,102,.06); border-color: var(--accent4); color: #d4ae60; }
.callout.danger { background: rgba(255,71,87,.06); border-color: var(--red); color: #d47a84; }
.callout.tip { background: rgba(6,214,160,.06); border-color: var(--accent5); color: #5fcfb4; }

/* table inside card */
.tbl-wrap { overflow-x: auto; padding: 0 18px 18px; }
table { width: 100%; border-collapse: collapse; font-size: .8rem; }
th {
  text-align: left;
  color: var(--muted);
  font-weight: 600;
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border2);
}
td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
tr:last-child td { border-bottom: none; }
td:first-child { font-family: 'JetBrains Mono', monospace; color: var(--accent2); font-size: .76rem; }
td.desc { color: #9aa4d0; line-height: 1.5; }

/* divider */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0 18px 14px;
}

/* Floating Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  background: var(--bg3);
  border: 1px solid var(--border2);
  color: var(--text);
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all .25s ease;
  z-index: 999;
  box-shadow: 0 4px 20px rgba(0,0,0,.5);
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--accent1);
  color: #fff;
  border-color: var(--accent1);
  transform: translateY(-2px);
}

/* No search results card */
.no-results-card {
  display: none;
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  background: var(--bg2);
  border: 1px dashed var(--border2);
  border-radius: 16px;
  color: var(--muted);
}
.no-results-card h3 {
  font-size: 1.2rem;
  color: var(--text);
  margin-bottom: 8px;
}

/* footer */
footer {
  text-align: center;
  padding: 48px 20px;
  color: var(--muted);
  font-size: .82rem;
  border-top: 1px solid var(--border);
  background: var(--bg);
}
footer span { color: var(--accent1); }
footer a { color: var(--accent2); text-decoration: none; font-weight: 600; }
footer a:hover { text-decoration: underline; }

/* scrollbar */
::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--border3); }

/* Responsive adjustments */
@media (max-width: 900px) {
  .site-nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    padding: 12px 16px;
  }
  .nav-search-container {
    order: 3;
    width: 100%;
    margin-top: 8px;
  }
  .grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .section-label { display: none; }
  .hero { padding: 40px 16px 32px; }
  .level-pills { gap: 6px; }
  .pill { padding: 4px 10px; font-size: .72rem; }
}

/* ============================================================
   CERTIFICATION PRACTICE EXAM ENGINE — Quiz Components
   ============================================================ */

body.theme-aplus {
  --accent1: #06d6a0;
  --accent2: #00d4ff;
  --accent3: #ffd166;
}
body.theme-security {
  --accent1: #ff6b9d;
  --accent2: #ff4757;
  --accent3: #ffd166;
}
body.theme-network {
  --accent1: #00d4ff;
  --accent2: #7c6aff;
  --accent3: #06d6a0;
}

.theme-aplus .hero::before {
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(6,214,160,.18) 0%, transparent 70%);
}
.theme-security .hero::before {
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(255,107,157,.18) 0%, transparent 70%);
}
.theme-network .hero::before {
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(0,212,255,.18) 0%, transparent 70%);
}

.nav-item.tab-aplus.active {
  background: rgba(6, 214, 160, 0.12);
  border-color: rgba(6, 214, 160, 0.4);
  color: #06d6a0;
  box-shadow: 0 0 16px rgba(6, 214, 160, 0.25);
}
.nav-item.tab-security.active {
  background: rgba(255, 107, 157, 0.12);
  border-color: rgba(255, 107, 157, 0.4);
  color: #ff6b9d;
  box-shadow: 0 0 16px rgba(255, 107, 157, 0.25);
}
.nav-item.tab-network.active {
  background: rgba(0, 212, 255, 0.12);
  border-color: rgba(0, 212, 255, 0.4);
  color: #00d4ff;
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.25);
}
.nav-divider {
  width: 1px;
  align-self: stretch;
  background: var(--border2);
  margin: 0 2px;
}

/* Quiz app container */
.quiz-app {
  max-width: 900px;
  margin: 0 auto;
}

.study-resources {
  max-width: 900px;
  margin: 8px auto 42px;
  padding-top: 28px;
  border-top: 1px solid var(--border2);
}
.study-resources-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 16px;
}
.section-kicker {
  color: var(--accent1);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.study-resources h2 {
  font-size: 1.35rem;
  margin: 5px 0;
}
.study-resources-heading p {
  color: var(--muted);
  font-size: .84rem;
  line-height: 1.5;
  margin: 0;
}
.study-resources-note {
  border: 1px solid var(--border2);
  border-radius: 999px;
  color: var(--muted);
  font-size: .7rem;
  padding: 6px 10px;
  white-space: nowrap;
}
.study-resource-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.study-resource-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 18px;
  text-decoration: none;
  transition: border-color .2s, transform .2s;
}
.study-resource-card:hover {
  border-color: var(--accent1);
  transform: translateY(-2px);
}
.study-resource-type {
  color: var(--muted);
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
}
.study-resource-title {
  color: var(--text);
  font-size: 1rem;
  font-weight: 800;
}
.study-resource-description {
  color: var(--text-dim);
  font-size: .78rem;
  line-height: 1.5;
}
.study-resource-link {
  color: var(--accent1);
  font-size: .78rem;
  font-weight: 800;
  margin-top: auto;
}

.quiz-hub-intro {
  text-align: center;
  margin-bottom: 36px;
}
.quiz-hub-intro h2 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 8px;
}
.quiz-hub-intro p {
  color: var(--muted);
  max-width: 640px;
  margin: 0 auto;
  font-size: .92rem;
  line-height: 1.6;
}

.quiz-group { margin-bottom: 36px; }
.quiz-group-label {
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent1);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border2);
}

.quiz-objectives {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  margin-bottom: 18px;
}
.quiz-objectives-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 14px;
}
.quiz-objectives-heading h3 {
  margin: 0;
  font-size: 1rem;
}
.quiz-objectives-heading a {
  color: var(--accent1);
  font-size: .75rem;
  font-weight: 700;
}
.quiz-objectives-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 10px;
}
.quiz-objective {
  border-left: 2px solid var(--accent1);
  padding: 3px 0 3px 12px;
}
.quiz-objective-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}
.quiz-objective h4 {
  margin: 0;
  font-size: .82rem;
}
.quiz-objective-top span {
  color: var(--accent1);
  font-size: .75rem;
  font-weight: 800;
  white-space: nowrap;
}
.quiz-objective p {
  color: var(--muted);
  font-size: .76rem;
  line-height: 1.45;
  margin: 5px 0 0;
}

.quiz-exam-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.quiz-exam-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color .2s, transform .2s;
}
.quiz-exam-card:hover {
  border-color: var(--border2);
  transform: translateY(-2px);
}
.quiz-exam-card-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; }
.quiz-exam-title { font-weight: 700; font-size: .95rem; }
.quiz-exam-count { font-size: .72rem; color: var(--muted); white-space: nowrap; padding-top: 2px; }
.quiz-exam-description { color: var(--text-dim); font-size: .78rem; line-height: 1.45; margin: 10px 0 4px; }
.quiz-best { font-size: .78rem; color: var(--accent1); font-weight: 600; }
.quiz-best-empty { color: var(--muted); font-weight: 500; }
.quiz-exam-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 4px; }

.quiz-btn {
  font-family: inherit;
  font-size: .82rem;
  font-weight: 700;
  padding: 9px 16px;
  border-radius: 9px;
  border: 1px solid var(--border2);
  cursor: pointer;
  background: var(--bg3);
  color: var(--text);
  transition: all .15s ease;
}
.quiz-btn:hover { border-color: var(--accent1); color: #fff; transform: translateY(-1px); }
.quiz-btn:disabled { opacity: .35; cursor: not-allowed; transform: none; }
.quiz-btn-primary {
  background: linear-gradient(135deg, var(--accent1), var(--accent2));
  border-color: transparent;
  color: #05060a;
}
.quiz-btn-primary:hover { filter: brightness(1.1); color: #05060a; }
.quiz-btn-ghost { background: transparent; }

/* Exam-taking view */
.quiz-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.quiz-progress-label { color: var(--muted); font-size: .82rem; font-weight: 600; }
.quiz-progress-bar {
  height: 6px;
  border-radius: 100px;
  background: var(--bg3);
  overflow: hidden;
  margin-bottom: 22px;
}
.quiz-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent1), var(--accent2));
  transition: width .2s ease;
}

.quiz-question-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  margin-bottom: 20px;
}
.quiz-question-text {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.6;
  margin-bottom: 20px;
}
.quiz-options { display: flex; flex-direction: column; gap: 10px; }
.quiz-option {
  display: flex;
  align-items: center;
  gap: 12px;
  text-align: left;
  padding: 12px 16px;
  border-radius: 10px;
  border: 1px solid var(--border2);
  background: var(--bg3);
  color: var(--text);
  font-family: inherit;
  font-size: .88rem;
  cursor: pointer;
  transition: all .15s ease;
}
.quiz-option:hover { border-color: var(--accent1); }
.quiz-option-selected {
  border-color: var(--accent1);
  background: rgba(124, 106, 255, 0.12);
  box-shadow: 0 0 0 1px var(--accent1) inset;
}
.quiz-option-letter {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: var(--bg);
  border: 1px solid var(--border2);
  display: grid;
  place-items: center;
  font-size: .74rem;
  font-weight: 800;
  color: var(--muted);
}
.quiz-option-selected .quiz-option-letter { color: var(--accent1); border-color: var(--accent1); }
.quiz-option-text { line-height: 1.5; }

.quiz-nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}
.quiz-nav-row-end { justify-content: flex-end; }
.quiz-jump-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  flex: 1;
}
.quiz-jump {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  border: 1px solid var(--border2);
  background: var(--bg3);
  color: var(--muted);
  font-size: .74rem;
  font-weight: 700;
  cursor: pointer;
}
.quiz-jump:hover { border-color: var(--accent1); color: #fff; }
.quiz-jump-answered { color: var(--accent1); border-color: var(--accent1); }
.quiz-jump-current { background: var(--accent1); color: #05060a; border-color: var(--accent1); }

/* Results view */
.quiz-results-card {
  text-align: center;
  background: var(--bg2);
  border: 1px solid var(--border2);
  border-radius: 18px;
  padding: 44px 24px;
  border-top: 4px solid var(--border2);
}
.quiz-results-card.quiz-pass { border-top-color: var(--green); }
.quiz-results-card.quiz-fail { border-top-color: var(--red); }
.quiz-results-title { font-size: 1.1rem; font-weight: 700; color: var(--muted); margin-bottom: 18px; }
.quiz-results-score { font-size: 2.6rem; font-weight: 900; }
.quiz-results-pct { font-size: 1.2rem; font-weight: 700; color: var(--accent1); margin-bottom: 10px; }
.quiz-results-status { color: var(--muted); font-size: .88rem; margin-bottom: 26px; }
.quiz-results-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

/* Review / answer key view */
.quiz-review-item {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--border2);
  border-radius: 14px;
  padding: 18px 20px;
  margin-bottom: 14px;
}
.quiz-review-correct { border-left-color: var(--green); }
.quiz-review-incorrect { border-left-color: var(--red); }
.quiz-review-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.quiz-review-num { font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.quiz-review-status { font-size: .72rem; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; }
.quiz-review-correct .quiz-review-status { color: var(--green); }
.quiz-review-incorrect .quiz-review-status { color: var(--red); }
.quiz-review-question { font-weight: 600; margin-bottom: 14px; line-height: 1.6; }
.quiz-review-options { display: flex; flex-direction: column; gap: 8px; margin-bottom: 12px; }
.quiz-review-opt {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 14px;
  border-radius: 9px;
  border: 1px solid var(--border);
  font-size: .84rem;
  color: var(--text-dim);
}
.quiz-review-opt-correct { border-color: var(--green); color: #7fe8c9; background: rgba(6,214,160,.06); }
.quiz-review-opt-wrong { border-color: var(--red); color: #f2a1a8; background: rgba(255,71,87,.06); }
.quiz-review-explanation {
  font-size: .84rem;
  color: var(--text-dim);
  line-height: 1.6;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}
.quiz-review-explanation strong { color: var(--text); }

.quiz-error { text-align: center; color: var(--muted); padding: 40px; }

@media (max-width: 600px) {
  .quiz-results-score { font-size: 2rem; }
  .study-resources-heading { flex-direction: column; }
  .study-resource-grid { grid-template-columns: 1fr; }
  .quiz-objectives-heading { align-items: flex-start; flex-direction: column; gap: 6px; }
  .quiz-exam-grid { grid-template-columns: 1fr; }
}