/* ==========================================================================
   EduHub — design tokens
   Navy       #14213D   primary / headings / dark surfaces
   Gold       #F5A623   accent — CTAs, achievement, certificates
   Background #FFFFFF / #F5F7FC
   Text       #14213D / muted #5B6478
   ========================================================================== */

:root {
  --navy: #14213d;
  --navy-soft: #1f2e52;
  --gold: #f5a623;
  --gold-dark: #d9880f;
  --bg: #ffffff;
  --bg-tint: #f5f7fc;
  --text: #14213d;
  --text-muted: #5b6478;
  --border: rgba(20, 33, 61, 0.09);
  --success: #2fa36b;
}

* { box-sizing: border-box; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

h1, h2, h3, h4, h5 {
  font-family: 'Sora', sans-serif;
  color: var(--navy);
  margin: 0;
}

a { text-decoration: none; }

.section { padding: 96px 0; }
.section-tint { background: var(--bg-tint); }

.section-heading {
  max-width: 640px;
  margin: 0 auto 56px;
}

.section-eyebrow {
  display: inline-block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold-dark);
  margin-bottom: 10px;
}

.section-heading h2 {
  font-size: 2.1rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.section-heading p {
  color: var(--text-muted);
  font-size: 1.02rem;
  margin: 0;
}

/* ---------------------------------- Buttons ---------------------------------- */

.btn-cta {
  background: var(--gold);
  color: var(--navy);
  font-weight: 700;
  border: none;
  padding: 12px 26px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-cta:hover { background: var(--gold-dark); color: var(--navy); }

.btn-ghost {
  background: transparent;
  border: 1.5px solid var(--border);
  color: var(--navy);
  font-weight: 600;
  padding: 12px 24px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-ghost:hover { border-color: var(--navy); color: var(--navy); background: var(--bg-tint); }

.btn-login {
  color: var(--navy);
  font-weight: 600;
  padding: 10px 16px;
}

.btn-login:hover { color: var(--gold-dark); }

/* ---------------------------------- Navbar ---------------------------------- */

#mainNav {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  padding: 14px 0;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

#mainNav.scrolled {
  border-color: var(--border);
  box-shadow: 0 4px 20px rgba(20, 33, 61, 0.05);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: 'Sora', sans-serif;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--navy);
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--navy);
  color: var(--gold);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.navbar-nav .nav-link {
  color: var(--text);
  font-weight: 500;
  font-size: 0.92rem;
  padding: 8px 16px !important;
}

.navbar-nav .nav-link:hover { color: var(--gold-dark); }

.nav-cta { align-items: center; }

/* ---------------------------------- Hero ---------------------------------- */

.hero {
  padding: 168px 0 90px;
  background: radial-gradient(circle at top right, #eef1fb 0%, #ffffff 55%);
}

.eyebrow-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: #fff5e4;
  color: var(--gold-dark);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 7px 14px;
  border-radius: 999px;
  margin-bottom: 20px;
}

.hero-title {
  font-size: 2.7rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero-lead {
  font-size: 1.08rem;
  color: var(--text-muted);
  max-width: 520px;
  margin-bottom: 30px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}

.hero-trust {
  font-size: 0.84rem;
  color: var(--text-muted);
}

.hero-trust i { color: var(--success); margin-right: 3px; }

/* ---------------------------------- Hero visual wrap ---------------------------------- */

.hero-visual-wrap {
  position: relative;
}

.hero-blobs {
  position: absolute;
  top: -60px;
  right: -60px;
  width: 130%;
  max-width: 560px;
  z-index: 0;
  pointer-events: none;
}

.hero-visual-wrap .quiz-mock {
  position: relative;
}

/* ---------------------------------- Hero quiz mockup ---------------------------------- */

.quiz-mock {
  background: #fff;
  border-radius: 20px;
  padding: 26px;
  box-shadow: 0 30px 70px rgba(20, 33, 61, 0.16);
  border: 1px solid var(--border);
  position: relative;
  z-index: 2;
}

.quiz-mock-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.quiz-mock-progress {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 600;
}

.quiz-mock-timer {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.85rem;
  font-weight: 600;
  background: #fff5e4;
  color: var(--gold-dark);
  padding: 5px 12px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.quiz-mock-progressbar {
  height: 6px;
  border-radius: 999px;
  margin-bottom: 22px;
  background: var(--border);
}

.quiz-mock-progressbar .progress-bar {
  background: var(--navy);
}

.quiz-mock-question {
  font-family: 'Sora', sans-serif;
  font-weight: 600;
  font-size: 1.08rem;
  margin-bottom: 16px;
}

.quiz-mock-options { display: flex; flex-direction: column; gap: 10px; margin-bottom: 20px; }

.quiz-mock-option {
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 11px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
}

.quiz-mock-option .opt-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--bg-tint);
  font-size: 0.72rem;
  font-weight: 700;
  margin-right: 10px;
}

.quiz-mock-option.is-correct {
  border-color: var(--success);
  background: rgba(47, 163, 107, 0.07);
  color: #1f7a4d;
}

.quiz-mock-option.is-correct i { color: var(--success); }

.quiz-mock-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.badge-autosave {
  font-size: 0.76rem;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.quiz-mock-floater {
  position: absolute;
  bottom: -26px;
  left: -18px;
  background: var(--navy);
  color: #fff;
  border-radius: 14px;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 20px 40px rgba(20, 33, 61, 0.25);
  z-index: 3;
}

.quiz-mock-floater i {
  font-size: 1.5rem;
  color: var(--gold);
}

.quiz-mock-floater strong {
  display: block;
  font-size: 0.84rem;
}

.quiz-mock-floater span {
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.65);
}

/* ---------------------------------- Stats strip ---------------------------------- */

.stats-strip {
  background: var(--navy);
  padding: 46px 0;
}

.stat-num {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 2.1rem;
  font-weight: 600;
  color: var(--gold);
}

.stat-label {
  color: rgba(255, 255, 255, 0.65);
  font-size: 0.82rem;
  margin-top: 4px;
}

/* ---------------------------------- Feature panels ---------------------------------- */

.feature-panel {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 32px;
  height: 100%;
}

.feature-panel-head {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 26px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--border);
}

.feature-panel-icon {
  width: 50px;
  height: 50px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.admin-icon { background: var(--navy); }
.participant-icon { background: #fff5e4; }

.feature-panel-icon img {
  width: 30px;
  height: 30px;
}

.feature-panel-head h3 { font-size: 1.2rem; margin-bottom: 4px; }
.feature-panel-head p { color: var(--text-muted); font-size: 0.86rem; margin: 0; }

.feature-list { list-style: none; margin: 0; padding: 0; }

.feature-list li {
  display: flex;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.feature-list li:last-child { border-bottom: none; padding-bottom: 0; }
.feature-list li:first-child { padding-top: 0; }

.feature-list li > i {
  font-size: 1.15rem;
  color: var(--gold-dark);
  margin-top: 3px;
  flex-shrink: 0;
  width: 22px;
}

.feature-list h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.feature-list p {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin: 0;
}

/* ---------------------------------- Flow / how it works ---------------------------------- */

.flow-track {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}

.flow-step {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px 20px;
  position: relative;
}

.flow-num {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--gold-dark);
  background: #fff5e4;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.flow-step h4 { font-size: 0.95rem; margin-bottom: 8px; }
.flow-step p { font-size: 0.82rem; color: var(--text-muted); margin: 0; }

/* ---------------------------------- Audience cards ---------------------------------- */

.audience-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 16px;
  text-align: center;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.audience-card:hover { transform: translateY(-3px); border-color: var(--gold); }

.audience-card i {
  font-size: 1.6rem;
  color: var(--navy);
  margin-bottom: 12px;
  display: block;
}

.audience-card h4 { font-size: 0.92rem; font-weight: 600; margin: 0; }

/* ---------------------------------- CTA banner ---------------------------------- */

.cta-banner {
  background: linear-gradient(135deg, var(--navy), var(--navy-soft));
  padding: 76px 0;
  color: #fff;
}

.cta-banner h2 {
  color: #fff;
  font-size: 2rem;
  margin-bottom: 12px;
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 28px;
}

.cta-illustration {
  width: 100%;
  max-width: 340px;
}

/* ---------------------------------- FAQ ---------------------------------- */

.faq-accordion { max-width: 760px; margin: 0 auto; }

.accordion-item {
  border: 1px solid var(--border);
  border-radius: 12px !important;
  margin-bottom: 12px;
  overflow: hidden;
}

.accordion-button {
  font-family: 'Sora', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--navy);
  background: #fff;
}

.accordion-button:not(.collapsed) {
  background: var(--bg-tint);
  color: var(--navy);
  box-shadow: none;
}

.accordion-button:focus { box-shadow: none; border-color: var(--border); }

.accordion-body {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ---------------------------------- Footer ---------------------------------- */

.site-footer {
  background: var(--navy);
  color: rgba(255, 255, 255, 0.65);
  padding: 64px 0 30px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: 'Sora', sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  color: #fff;
  margin-bottom: 14px;
}

.site-footer p { font-size: 0.86rem; max-width: 300px; }

.site-footer h5 {
  color: #fff;
  font-size: 0.86rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.site-footer ul { list-style: none; padding: 0; margin: 0; }

.site-footer ul li { margin-bottom: 10px; }

.site-footer ul li a {
  color: rgba(255, 255, 255, 0.65);
  font-size: 0.86rem;
}

.site-footer ul li a:hover { color: var(--gold); }

.social-row { display: flex; gap: 10px; margin-top: 18px; }

.social-row a {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.social-row a:hover { background: var(--gold); color: var(--navy); }

.site-footer hr { border-color: rgba(255, 255, 255, 0.12); margin: 40px 0 20px; }

.footer-bottom { font-size: 0.8rem; margin: 0; }

/* ---------------------------------- Responsive ---------------------------------- */

@media (max-width: 991.98px) {
  .hero { padding: 140px 0 70px; }
  .hero-title { font-size: 2.1rem; }
  .flow-track { grid-template-columns: repeat(2, 1fr); }
  .quiz-mock-floater { left: 8px; }
  .navbar-collapse { background: #fff; padding: 16px; border-radius: 12px; margin-top: 10px; box-shadow: 0 10px 30px rgba(20,33,61,0.1); }
  .nav-cta { margin-top: 10px; }
}

@media (max-width: 575.98px) {
  .section { padding: 64px 0; }
  .flow-track { grid-template-columns: 1fr; }
  .hero-title { font-size: 1.8rem; }
  .quiz-mock-floater { position: static; margin-top: 16px; }
}