@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800;900&family=DM+Sans:ital,wght@0,300;0,400;0,500;0,600;1,400&family=Space+Mono:wght@400;700&display=swap');

/* ═══════════════════════════════════════════
   EDUHUB – DESIGN SYSTEM
   Pure HTML + CSS, PHP-ready template
═══════════════════════════════════════════ */

:root {
  --primary:        #5C33F6;
  --primary-light:  #7B5FF8;
  --primary-dark:   #4220D4;
  --primary-faint:  rgba(92,51,246,0.08);
  --yellow:         #FFD94A;
  --yellow-dark:    #F0C300;
  --yellow-faint:   rgba(255,217,74,0.18);
  --coral:          #FF6B6B;
  --coral-faint:    rgba(255,107,107,0.1);
  --green:          #3DDC84;
  --green-dark:     #28B869;
  --green-faint:    rgba(61,220,132,0.12);
  --bg:             #F7F7F2;
  --surface:        #FFFFFF;
  --navy:           #1A1A3E;
  --slate:          #6B7280;
  --slate-light:    #D1D5DB;
  --border:         #E5E7EB;
  --shadow-sm:      0 2px 8px rgba(26,26,62,0.07);
  --shadow-md:      0 4px 20px rgba(26,26,62,0.11);
  --shadow-lg:      0 8px 40px rgba(26,26,62,0.15);
  --radius-sm:      8px;
  --radius-md:      14px;
  --radius-lg:      20px;
  --radius-xl:      28px;
  --radius-pill:    100px;
  --font-display:   'Nunito', sans-serif;
  --font-body:      'DM Sans', sans-serif;
  --font-mono:      'Space Mono', monospace;
  --nav-h:          68px;
  --sidebar-w:      255px;
  --transition:     0.2s cubic-bezier(.4,0,.2,1);
}

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: var(--font-body); background: var(--bg); color: var(--navy); line-height: 1.6; min-height: 100vh; }
a  { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; font-family: var(--font-body); border: none; background: none; }
input, select, textarea { font-family: var(--font-body); }

/* ── TYPOGRAPHY ── */
h1,h2,h3,h4,h5 { font-family: var(--font-display); font-weight: 800; line-height: 1.2; color: var(--navy); }
h1 { font-size: clamp(1.9rem,5vw,3.2rem); }
h2 { font-size: clamp(1.4rem,3.5vw,2.2rem); }
h3 { font-size: clamp(1.05rem,2.5vw,1.35rem); }
h4 { font-size: 1.05rem; }
p  { color: var(--slate); font-size: .97rem; line-height: 1.7; }

.section-label {
  font-family: var(--font-display); font-weight: 800; font-size: .75rem;
  letter-spacing: .12em; text-transform: uppercase; color: var(--primary);
  background: var(--primary-faint); display: inline-block;
  padding: 4px 14px; border-radius: var(--radius-pill);
}

/* ── LAYOUT ── */
.container    { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.container-sm { max-width: 760px;  margin: 0 auto; padding: 0 24px; }

/* ── UTILITY ── */
.flex               { display: flex; }
.flex-col           { flex-direction: column; }
.items-center       { align-items: center; }
.justify-between    { justify-content: space-between; }
.text-center        { text-align: center; }
.w-full             { width: 100%; }
.font-mono          { font-family: var(--font-mono); }
.text-primary       { color: var(--primary); }
.text-green         { color: var(--green-dark); }
.text-coral         { color: var(--coral); }
.text-slate         { color: var(--slate); }
.mt-8  { margin-top: 8px; }   .mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }  .mt-32 { margin-top: 32px; }
.mb-8  { margin-bottom: 8px; }.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px;}.mb-32 { margin-bottom: 32px; }
.gap-8  { gap: 8px; }  .gap-12 { gap: 12px; }
.gap-16 { gap: 16px; } .gap-24 { gap: 24px; }

/* ── GRID ── */
.grid-2    { display: grid; grid-template-columns: repeat(2,1fr); gap: 20px; }
.grid-3    { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.grid-4    { display: grid; grid-template-columns: repeat(4,1fr); gap: 20px; }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fill,minmax(280px,1fr)); gap: 20px; }

/* ── BUTTONS ── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 24px; border-radius: var(--radius-pill);
  font-family: var(--font-display); font-weight: 700; font-size: .92rem;
  transition: all var(--transition); white-space: nowrap; cursor: pointer;
}
.btn-primary {
  background: var(--primary); color: #fff;
  box-shadow: 0 4px 14px rgba(92,51,246,.28);
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(92,51,246,.36); }
.btn-yellow  { background: var(--yellow); color: var(--navy); box-shadow: 0 4px 14px rgba(255,217,74,.32); }
.btn-yellow:hover  { background: var(--yellow-dark); transform: translateY(-2px); }
.btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
.btn-ghost   { background: transparent; color: var(--slate); padding: 10px 18px; }
.btn-ghost:hover   { background: var(--border); color: var(--navy); }
.btn-sm { padding: 7px 16px; font-size: .82rem; }
.btn-lg { padding: 15px 34px; font-size: 1.02rem; }
.btn-danger { background: var(--coral); color: #fff; }
.btn-danger:hover { background: #e05555; transform: translateY(-2px); }

/* ── CARD ── */
.card {
  background: var(--surface); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm); border: 1.5px solid var(--border); padding: 24px;
  transition: box-shadow var(--transition), transform var(--transition);
}
.card:hover { box-shadow: var(--shadow-md); }
.card-hover:hover { transform: translateY(-3px); }
.card-accent-left   { border-left: 4px solid var(--primary); }
.card-accent-yellow { border-left: 4px solid var(--yellow); }
.card-accent-green  { border-left: 4px solid var(--green); }
.card-accent-coral  { border-left: 4px solid var(--coral); }

/* ── BADGE ── */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 11px; border-radius: var(--radius-pill);
  font-size: .75rem; font-weight: 700; font-family: var(--font-display);
}
.badge-primary { background: var(--primary-faint);  color: var(--primary); }
.badge-yellow  { background: var(--yellow-faint);   color: #7a5500; }
.badge-green   { background: var(--green-faint);    color: var(--green-dark); }
.badge-coral   { background: var(--coral-faint);    color: #b02020; }
.badge-navy    { background: var(--navy);            color: #fff; }

/* ── PROGRESS BAR ── */
.progress-bar  { height: 10px; background: var(--border); border-radius: var(--radius-pill); overflow: hidden; }
.progress-fill { height: 100%; border-radius: var(--radius-pill); background: linear-gradient(90deg,var(--primary),var(--primary-light)); transition: width .6s ease; }
.progress-fill.yellow { background: linear-gradient(90deg,var(--yellow-dark),var(--yellow)); }
.progress-fill.green  { background: linear-gradient(90deg,var(--green-dark),var(--green)); }
.progress-fill.coral  { background: linear-gradient(90deg,#d94040,var(--coral)); }

/* ── FORMS ── */
.form-group   { margin-bottom: 18px; }
.form-label   { display: block; font-family: var(--font-display); font-weight: 700; font-size: .87rem; color: var(--navy); margin-bottom: 6px; }
.form-input, .form-select, .form-textarea {
  width: 100%; padding: 11px 15px;
  border: 1.5px solid var(--border); border-radius: var(--radius-md);
  font-family: var(--font-body); font-size: .93rem; color: var(--navy);
  background: var(--surface); outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--primary); box-shadow: 0 0 0 3px rgba(92,51,246,.1);
}
.form-textarea { min-height: 100px; resize: vertical; }
.form-hint     { font-size: .78rem; color: var(--slate); margin-top: 5px; }
.form-error    { font-size: .78rem; color: var(--coral); margin-top: 5px; font-weight: 600; }

/* ── ALERT ── */
.alert { padding: 12px 16px; border-radius: var(--radius-md); font-size: .88rem; display: flex; align-items: flex-start; gap: 9px; margin-bottom: 14px; }
.alert-success { background: var(--green-faint);  border: 1.5px solid rgba(61,220,132,.3);  color: #1a6640; }
.alert-warning { background: var(--yellow-faint); border: 1.5px solid rgba(255,193,7,.4);   color: #7a5500; }
.alert-info    { background: var(--primary-faint); border: 1.5px solid rgba(92,51,246,.18); color: var(--primary-dark); }
.alert-danger  { background: var(--coral-faint);  border: 1.5px solid rgba(255,107,107,.3); color: #b02020; }

/* ── STAT CARD ── */
.stat-card { background: var(--surface); border-radius: var(--radius-lg); border: 1.5px solid var(--border); padding: 20px 22px; display: flex; align-items: flex-start; gap: 14px; box-shadow: var(--shadow-sm); }
.stat-icon { width: 46px; height: 46px; border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; font-size: 1.3rem; flex-shrink: 0; }
.stat-icon.purple { background: var(--primary-faint); }
.stat-icon.yellow { background: var(--yellow-faint); }
.stat-icon.green  { background: var(--green-faint); }
.stat-icon.coral  { background: var(--coral-faint); }
.stat-value { font-family: var(--font-mono); font-size: 1.7rem; font-weight: 700; color: var(--navy); line-height: 1; }
.stat-label { font-size: .82rem; color: var(--slate); margin-top: 3px; }
.stat-delta { font-size: .75rem; font-weight: 700; color: var(--green-dark); margin-top: 4px; }

/* ── TABLE ── */
.table-wrapper { overflow-x: auto; border-radius: var(--radius-lg); border: 1.5px solid var(--border); }
.data-table { width: 100%; border-collapse: collapse; background: var(--surface); }
.data-table th { background: var(--bg); font-family: var(--font-display); font-weight: 800; font-size: .75rem; letter-spacing: .06em; text-transform: uppercase; color: var(--slate); padding: 13px 18px; text-align: left; border-bottom: 1.5px solid var(--border); }
.data-table td { padding: 13px 18px; border-bottom: 1px solid var(--border); font-size: .9rem; }
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: rgba(92,51,246,.03); }

/* ── PAGINATION ── */
.pagination { display: flex; align-items: center; gap: 5px; justify-content: center; margin-top: 28px; flex-wrap: wrap; }
.page-btn { width: 36px; height: 36px; border-radius: var(--radius-sm); border: 1.5px solid var(--border); background: var(--surface); font-family: var(--font-display); font-weight: 700; font-size: .85rem; color: var(--slate); display: flex; align-items: center; justify-content: center; transition: all var(--transition); }
.page-btn:hover  { border-color: var(--primary); color: var(--primary); }
.page-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ── AI ELEMENTS ── */
.ai-dot   { width: 8px; height: 8px; border-radius: 50%; background: var(--green); animation: pulse 1.5s ease-in-out infinite; display: inline-block; }
.ai-label { display: inline-flex; align-items: center; gap: 6px; font-family: var(--font-display); font-weight: 800; font-size: .78rem; color: var(--primary); background: var(--primary-faint); padding: 4px 12px; border-radius: var(--radius-pill); }
.ai-panel { background: linear-gradient(135deg,rgba(92,51,246,.05),rgba(255,107,107,.03)); border: 1.5px solid rgba(92,51,246,.18); border-radius: var(--radius-lg); padding: 22px; }
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:.5;transform:scale(.8)} }

/* ── LB ROW ── */
.lb-avatar { width: 38px; height: 38px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-family: var(--font-display); font-weight: 800; font-size: .82rem; color: #fff; flex-shrink: 0; }

/* ════════════════════════════════════════
   NAVBAR
════════════════════════════════════════ */
.navbar {
  position: sticky; top: 0; z-index: 200;
  height: var(--nav-h);
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(14px);
  border-bottom: 1.5px solid var(--border);
}
.navbar .container { display: flex; align-items: center; justify-content: space-between; height: 100%; }

.nav-logo {
  font-family: var(--font-display); font-weight: 900; font-size: 1.5rem;
  color: var(--primary); display: flex; align-items: center; gap: 6px; flex-shrink: 0;
}
.nav-logo .logo-hub { color: var(--navy); }
.nav-logo .logo-dot { width: 9px; height: 9px; background: var(--yellow); border-radius: 50%; display: inline-block; }

.nav-links { display: flex; align-items: center; gap: 2px; }
.nav-links a {
  font-family: var(--font-display); font-weight: 700; font-size: .9rem;
  color: var(--slate); padding: 8px 13px; border-radius: var(--radius-sm);
  transition: all var(--transition); position: relative;
}
.nav-links a:hover  { color: var(--primary); background: var(--primary-faint); }
.nav-links a.active { color: var(--primary); }
.nav-links a.active::after {
  content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
  width: 18px; height: 3px; background: var(--yellow); border-radius: var(--radius-pill);
}

.nav-actions { display: flex; align-items: center; gap: 8px; }
.nav-avatar  { width: 36px; height: 36px; border-radius: 50%; background: linear-gradient(135deg,var(--primary),var(--coral)); display: flex; align-items: center; justify-content: center; color: #fff; font-family: var(--font-display); font-weight: 800; font-size: .82rem; border: 2px solid var(--yellow); }

/* ── HAMBURGER ── */
.hamburger {
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  width: 38px; height: 38px; padding: 6px; border-radius: var(--radius-sm);
  cursor: pointer; transition: background var(--transition);
}
.hamburger:hover { background: var(--primary-faint); }
.hamburger span  { display: block; height: 2.5px; background: var(--navy); border-radius: 2px; transition: all .3s ease; }
.hamburger.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* ── MOBILE NAV DRAWER ── */
.mobile-nav {
  display: none; /* shown via JS */
  position: fixed; top: var(--nav-h); left: 0; right: 0; bottom: 0;
  background: rgba(26,26,62,.5); z-index: 190;
  backdrop-filter: blur(4px);
}
.mobile-nav-inner {
  background: var(--surface); width: 280px; height: 100%;
  padding: 24px 16px; overflow-y: auto;
  border-right: 1.5px solid var(--border);
  transform: translateX(-100%); transition: transform .3s ease;
}
.mobile-nav.open .mobile-nav-inner { transform: translateX(0); }
.mobile-nav-section { font-family: var(--font-display); font-weight: 800; font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--slate-light); padding: 6px 12px; margin-top: 16px; }
.mobile-nav-link { display: flex; align-items: center; gap: 12px; padding: 11px 14px; border-radius: var(--radius-md); color: var(--slate); font-family: var(--font-display); font-weight: 700; font-size: .92rem; transition: all var(--transition); margin-bottom: 2px; }
.mobile-nav-link .icon { font-size: 1.1rem; width: 22px; text-align: center; }
.mobile-nav-link:hover  { background: var(--primary-faint); color: var(--primary); }
.mobile-nav-link.active { background: var(--primary-faint); color: var(--primary); }
.mobile-nav-divider { height: 1px; background: var(--border); margin: 12px 0; }
.mobile-nav-user { display: flex; align-items: center; gap: 12px; padding: 14px; background: var(--bg); border-radius: var(--radius-md); margin-bottom: 20px; }
.mobile-nav-user .nav-avatar { width: 42px; height: 42px; font-size: .9rem; }
.mobile-nav-user-name  { font-family: var(--font-display); font-weight: 800; font-size: .92rem; color: var(--navy); }
.mobile-nav-user-email { font-size: .75rem; color: var(--slate); }

/* ════════════════════════════════════════
   SIDEBAR LAYOUT
════════════════════════════════════════ */
.app-layout { display: flex; min-height: calc(100vh - var(--nav-h)); }
.sidebar {
  width: var(--sidebar-w); background: var(--surface);
  border-right: 1.5px solid var(--border); padding: 24px 14px;
  flex-shrink: 0; position: sticky; top: var(--nav-h);
  height: calc(100vh - var(--nav-h)); overflow-y: auto;
}
.sidebar-section-title { font-family: var(--font-display); font-weight: 800; font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--slate-light); padding: 8px 12px 5px; margin-top: 14px; }
.sidebar-link { display: flex; align-items: center; gap: 11px; padding: 10px 13px; border-radius: var(--radius-md); color: var(--slate); font-family: var(--font-display); font-weight: 700; font-size: .9rem; transition: all var(--transition); margin-bottom: 2px; }
.sidebar-link .icon { font-size: 1.1rem; width: 20px; text-align: center; }
.sidebar-link:hover  { background: var(--primary-faint); color: var(--primary); }
.sidebar-link.active { background: var(--primary-faint); color: var(--primary); }
.sidebar-badge { margin-left: auto; background: var(--primary); color: #fff; font-size: .68rem; font-weight: 700; padding: 2px 7px; border-radius: var(--radius-pill); font-family: var(--font-mono); }
.page-content { flex: 1; padding: 32px 36px; overflow-x: hidden; min-width: 0; }

/* ════════════════════════════════════════
   COURSE CARD
════════════════════════════════════════ */
.course-card { background: var(--surface); border-radius: var(--radius-lg); border: 1.5px solid var(--border); overflow: hidden; transition: all var(--transition); box-shadow: var(--shadow-sm); }
.course-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.course-card-header { padding: 26px 22px 18px; position: relative; overflow: hidden; }
.course-card-body   { padding: 18px 22px 20px; }
.course-card-footer { display: flex; align-items: center; justify-content: space-between; padding: 12px 22px; border-top: 1px solid var(--border); background: var(--bg); gap: 8px; flex-wrap: wrap; }
.course-emoji { font-size: 2.2rem; margin-bottom: 10px; }
.course-card-header.purple { background: linear-gradient(135deg,rgba(92,51,246,.1),rgba(92,51,246,.04)); }
.course-card-header.yellow { background: linear-gradient(135deg,rgba(255,217,74,.18),rgba(255,217,74,.06)); }
.course-card-header.green  { background: linear-gradient(135deg,rgba(61,220,132,.15),rgba(61,220,132,.04)); }
.course-card-header.coral  { background: linear-gradient(135deg,rgba(255,107,107,.12),rgba(255,107,107,.04)); }
.course-card-header.teal   { background: linear-gradient(135deg,rgba(0,188,212,.12),rgba(0,188,212,.04)); }
.course-card-header.navy   { background: linear-gradient(135deg,rgba(26,26,62,.08),rgba(26,26,62,.02)); }

/* ════════════════════════════════════════
   TABS (JS-powered)
════════════════════════════════════════ */
.tabs { display: flex; gap: 3px; border-bottom: 2px solid var(--border); margin-bottom: 24px; flex-wrap: wrap; }
.tab-link { font-family: var(--font-display); font-weight: 700; font-size: .9rem; color: var(--slate); padding: 9px 16px; border-radius: var(--radius-sm) var(--radius-sm) 0 0; transition: all var(--transition); position: relative; bottom: -2px; border-bottom: 2px solid transparent; cursor: pointer; }
.tab-link:hover  { color: var(--primary); }
.tab-link.active { color: var(--primary); border-bottom-color: var(--primary); background: rgba(92,51,246,.04); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ════════════════════════════════════════
   QUIZ PAGE — reference style
   Full-screen card, 2×2 option grid
════════════════════════════════════════ */
.quiz-page-body { background: linear-gradient(135deg,#f0edff 0%,#fff9ec 100%); min-height: calc(100vh - var(--nav-h)); }

/* Top bar */
.quiz-topbar { background: rgba(255,255,255,.94); backdrop-filter: blur(12px); border-bottom: 1.5px solid var(--border); padding: 14px 0; }
.quiz-topbar-inner { max-width: 820px; margin: 0 auto; padding: 0 20px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.quiz-course-label { font-family: var(--font-display); font-weight: 800; font-size: .85rem; color: var(--primary); flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.quiz-timer { display: flex; align-items: center; gap: 6px; background: rgba(255,107,107,.1); color: var(--coral); border: 1.5px solid rgba(255,107,107,.25); padding: 7px 14px; border-radius: var(--radius-pill); font-family: var(--font-mono); font-weight: 700; font-size: .95rem; flex-shrink: 0; }

/* Progress strip */
.quiz-progress-strip { height: 5px; background: var(--border); }
.quiz-progress-fill  { height: 100%; background: linear-gradient(90deg,var(--primary),var(--yellow)); transition: width .4s ease; }

/* Main card */
.quiz-main { max-width: 820px; margin: 0 auto; padding: 32px 20px 60px; }
.quiz-card { background: var(--surface); border-radius: var(--radius-xl); box-shadow: var(--shadow-lg); border: 1.5px solid var(--border); overflow: hidden; }
.quiz-card-head {
  background: linear-gradient(135deg,var(--primary) 0%,var(--primary-light) 100%);
  padding: 28px 32px 24px;
  position: relative; overflow: hidden;
}
.quiz-card-head::before {
  content: ''; position: absolute; width: 260px; height: 260px;
  border-radius: 50%; background: rgba(255,255,255,.06);
  top: -80px; right: -60px;
}
.quiz-q-label { font-family: var(--font-display); font-weight: 800; font-size: .75rem; letter-spacing: .12em; text-transform: uppercase; color: rgba(255,255,255,.7); margin-bottom: 10px; }
.quiz-q-text  { font-family: var(--font-display); font-weight: 800; font-size: clamp(1.05rem,2.5vw,1.3rem); color: #fff; line-height: 1.45; position: relative; }
.quiz-q-nav   { display: flex; gap: 10px; margin-top: 18px; flex-wrap: wrap; align-items: center; }
.q-dot-nav    { width: 28px; height: 28px; border-radius: 50%; border: 2px solid rgba(255,255,255,.4); background: transparent; display: flex; align-items: center; justify-content: center; font-family: var(--font-mono); font-size: .7rem; color: rgba(255,255,255,.7); font-weight: 700; cursor: pointer; transition: all var(--transition); flex-shrink: 0; }
.q-dot-nav.done    { background: rgba(255,255,255,.25); border-color: rgba(255,255,255,.6); color: #fff; }
.q-dot-nav.current { background: var(--yellow); border-color: var(--yellow); color: var(--navy); }

/* Options — 2×2 grid */
.quiz-card-body { padding: 28px 32px 32px; }
.quiz-options-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.quiz-option {
  display: flex; align-items: center; gap: 14px;
  padding: 16px 18px; border: 2px solid var(--border);
  border-radius: var(--radius-md); cursor: pointer;
  transition: all var(--transition); background: var(--surface);
  user-select: none;
}
.quiz-option:hover { border-color: var(--primary); background: var(--primary-faint); }
.quiz-option input[type="radio"] { display: none; }
.quiz-option:has(input:checked) { border-color: var(--primary); background: var(--primary-faint); }
.option-bubble {
  width: 36px; height: 36px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-weight: 800; font-size: .88rem;
  background: var(--bg); color: var(--slate);
  border: 2px solid var(--border); transition: all var(--transition);
}
.quiz-option:hover .option-bubble      { background: var(--primary-faint); border-color: var(--primary); color: var(--primary); }
.quiz-option:has(input:checked) .option-bubble { background: var(--primary); border-color: var(--primary); color: #fff; }
.option-text { font-family: var(--font-display); font-weight: 700; font-size: .9rem; color: var(--navy); line-height: 1.4; }
.quiz-option.correct { border-color: var(--green); background: var(--green-faint); }
.quiz-option.correct .option-bubble   { background: var(--green); border-color: var(--green); color: #fff; }
.quiz-option.wrong   { border-color: var(--coral); background: var(--coral-faint); }
.quiz-option.wrong .option-bubble     { background: var(--coral); border-color: var(--coral); color: #fff; }

/* Hint */
.quiz-hint { background: rgba(255,217,74,.12); border: 1.5px solid rgba(255,193,7,.35); border-radius: var(--radius-md); padding: 12px 16px; font-size: .87rem; color: #7a5500; display: flex; gap: 9px; align-items: flex-start; margin-top: 20px; }
.quiz-ai-btn { display: inline-flex; align-items: center; gap: 7px; color: var(--primary); font-family: var(--font-display); font-weight: 700; font-size: .86rem; padding: 8px 16px; border-radius: var(--radius-pill); border: 1.5px solid rgba(92,51,246,.22); background: var(--primary-faint); margin-top: 16px; cursor: pointer; transition: all var(--transition); }
.quiz-ai-btn:hover { background: rgba(92,51,246,.14); }
.quiz-nav-btns { display: flex; align-items: center; justify-content: space-between; margin-top: 24px; flex-wrap: wrap; gap: 10px; }

/* Score circle */
.score-circle { width: 136px; height: 136px; border-radius: 50%; border: 8px solid var(--border); display: flex; flex-direction: column; align-items: center; justify-content: center; margin: 0 auto; background: var(--surface); }
.score-circle.high   { border-color: var(--green); box-shadow: 0 0 0 6px var(--green-faint); }
.score-circle.medium { border-color: var(--yellow); box-shadow: 0 0 0 6px var(--yellow-faint); }
.score-circle.low    { border-color: var(--coral);  box-shadow: 0 0 0 6px var(--coral-faint); }
.score-pct  { font-family: var(--font-mono); font-size: 1.9rem; font-weight: 700; color: var(--navy); line-height: 1; }
.score-text { font-size: .75rem; color: var(--slate); margin-top: 3px; }

/* ════════════════════════════════════════
   ACCORDION (JS-powered)
════════════════════════════════════════ */
.accordion-item { border: 1.5px solid var(--border); border-radius: var(--radius-md); margin-bottom: 8px; overflow: hidden; }
.accordion-header { display: flex; align-items: center; justify-content: space-between; padding: 15px 18px; cursor: pointer; background: var(--surface); transition: background var(--transition); user-select: none; gap: 12px; }
.accordion-header:hover  { background: var(--primary-faint); }
.accordion-header.open   { background: var(--primary-faint); }
.accordion-title  { font-family: var(--font-display); font-weight: 700; font-size: .92rem; color: var(--navy); flex: 1; }
.accordion-arrow  { font-size: .85rem; color: var(--slate); transition: transform .3s ease; flex-shrink: 0; }
.accordion-header.open .accordion-arrow { transform: rotate(180deg); }
.accordion-body   { display: none; padding: 0 18px 16px; font-size: .88rem; color: var(--slate); line-height: 1.65; }
.accordion-body.open { display: block; }

/* ════════════════════════════════════════
   FILTER CHIPS (JS-powered)
════════════════════════════════════════ */
.filter-chips { display: flex; gap: 7px; flex-wrap: wrap; }
.filter-chip {
  padding: 7px 15px; border-radius: var(--radius-pill);
  border: 1.5px solid var(--border); background: var(--surface);
  font-family: var(--font-display); font-weight: 700; font-size: .8rem;
  color: var(--slate); cursor: pointer; transition: all var(--transition);
}
.filter-chip:hover  { border-color: var(--primary); color: var(--primary); }
.filter-chip.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ════════════════════════════════════════
   FOOTER
════════════════════════════════════════ */
.footer { background: var(--navy); color: rgba(255,255,255,.65); padding: 56px 0 28px; margin-top: 72px; }
.footer-logo    { font-family: var(--font-display); font-weight: 900; font-size: 1.55rem; color: #fff; }
.footer-tagline { font-size: .85rem; color: rgba(255,255,255,.45); margin-top: 5px; }
.footer-heading { font-family: var(--font-display); font-weight: 800; font-size: .82rem; color: #fff; margin-bottom: 12px; letter-spacing: .06em; text-transform: uppercase; }
.footer-links a { display: block; color: rgba(255,255,255,.5); font-size: .88rem; margin-bottom: 7px; transition: color var(--transition); }
.footer-links a:hover { color: var(--yellow); }
.footer-divider { border: none; border-top: 1px solid rgba(255,255,255,.09); margin: 32px 0 20px; }
.footer-bottom  { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; font-size: .8rem; }

/* ════════════════════════════════════════
   ANIMATIONS
════════════════════════════════════════ */
@keyframes fadeInUp  { from{opacity:0;transform:translateY(22px)} to{opacity:1;transform:translateY(0)} }
@keyframes fadeIn    { from{opacity:0} to{opacity:1} }
@keyframes float1 { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-12px)} }
@keyframes float2 { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-8px)} }
@keyframes float3 { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-15px)} }
.anim-fade-up { animation: fadeInUp .5s ease both; }
.anim-fade    { animation: fadeIn .4s ease both; }
.delay-1 { animation-delay: .1s; } .delay-2 { animation-delay: .2s; }
.delay-3 { animation-delay: .3s; } .delay-4 { animation-delay: .4s; }
.delay-5 { animation-delay: .5s; }

/* ════════════════════════════════════════
   RESPONSIVE BREAKPOINTS
════════════════════════════════════════ */

/* 1024px – collapse 4-col grids, tighten page-content */
@media (max-width: 1024px) {
  .grid-4       { grid-template-columns: repeat(2,1fr); }
  .grid-3       { grid-template-columns: repeat(2,1fr); }
  .page-content { padding: 24px 20px; }
}

/* 768px – hide sidebar + desktop nav, show hamburger */
@media (max-width: 768px) {
  .sidebar      { display: none; }
  .nav-links    { display: none; }
  .nav-actions .btn { display: none; }
  .hamburger    { display: flex; }
  .grid-2,.grid-3,.grid-4 { grid-template-columns: 1fr; }
  .quiz-options-grid { grid-template-columns: 1fr; }
  .page-content { padding: 18px 14px; }
  .container,.container-sm { padding: 0 14px; }
  .btn-lg       { padding: 13px 26px; }
  h1 { font-size: 1.85rem; }
  h2 { font-size: 1.4rem; }
  .quiz-card-head { padding: 22px 20px 18px; }
  .quiz-card-body { padding: 20px 20px 24px; }
  .footer { margin-top: 40px; }
  .footer .grid-4 { grid-template-columns: 1fr 1fr; gap: 28px; }
}

/* 480px – further tighten */
@media (max-width: 480px) {
  :root { --nav-h: 60px; }
  .navbar { height: 60px; }
  .nav-logo { font-size: 1.3rem; }
  .stat-card { flex-direction: column; gap: 8px; }
  .stat-value { font-size: 1.5rem; }
  .quiz-topbar-inner { gap: 10px; }
  .quiz-timer { padding: 6px 10px; font-size: .85rem; }
  .footer .grid-4 { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}