:root {
  --bg-warm: #FFFDF9;
  --primary-sky: #D8ECFF;
  --primary-sky-dark: #2B6CB0;
  --accent-mint: #D4F4E2;
  --accent-mint-dark: #276749;
  --accent-lavender: #E9D8FD;
  --accent-lavender-dark: #553C9A;
  --accent-butter: #FEFCBF;
  --accent-butter-dark: #975A16;
  --accent-peach: #FED7E2;
  --accent-peach-dark: #97266D;
  --text-main: #2D3748;
  --text-muted: #5A677D;
  --card-bg: rgba(255, 255, 255, 0.94);
  --border-light: rgba(102, 126, 234, 0.2);
  --shadow-soft: 0 12px 28px -6px rgba(66, 153, 225, 0.12), 0 4px 12px -2px rgba(0, 0, 0, 0.04);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-pill: 999px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Quicksand', 'Nunito', sans-serif;
  background-color: var(--bg-warm);
  background-image:
    radial-gradient(#D8ECFF 1.4px, transparent 1.4px),
    radial-gradient(#FED7E2 1.4px, var(--bg-warm) 1.4px);
  background-size: 36px 36px;
  background-position: 0 0, 18px 18px;
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
}

.navbar {
  position: sticky;
  top: 14px;
  z-index: 100;
  max-width: 1140px;
  margin: 14px auto 0;
  padding: 12px 24px;
  background: rgba(255, 253, 249, 0.9);
  backdrop-filter: blur(12px);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-soft);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--text-main);
  text-decoration: none;
}

.brand-tag {
  background: linear-gradient(135deg, var(--primary-sky), var(--accent-mint));
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--primary-sky-dark);
}

.nav-links {
  display: flex;
  gap: 6px;
  list-style: none;
  flex-wrap: wrap;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 7px 13px;
  border-radius: var(--radius-pill);
  transition: all 0.2s ease;
}

.nav-links a:hover {
  background: var(--primary-sky);
  color: var(--primary-sky-dark);
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 22px;
}

section {
  padding: 60px 0;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 40px;
}

.pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.badge-sky { background: var(--primary-sky); color: var(--primary-sky-dark); }
.badge-mint { background: var(--accent-mint); color: var(--accent-mint-dark); }
.badge-lavender { background: var(--accent-lavender); color: var(--accent-lavender-dark); }
.badge-butter { background: var(--accent-butter); color: var(--accent-butter-dark); }
.badge-peach { background: var(--accent-peach); color: var(--accent-peach-dark); }

.section-title {
  font-size: clamp(1.75rem, 3.2vw, 2.4rem);
  font-weight: 800;
  margin-bottom: 10px;
  line-height: 1.25;
}

.section-subtitle {
  font-size: 1.02rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* HERO SECTION */
.hero-card {
  background: linear-gradient(135deg, rgba(216, 236, 255, 0.55) 0%, rgba(255, 253, 249, 0.96) 50%, rgba(212, 244, 226, 0.55) 100%);
  border: 2.5px solid rgba(66, 153, 225, 0.25);
  border-radius: 30px;
  padding: 44px 36px;
  box-shadow: var(--shadow-soft);
  display: grid;
  grid-template-columns: 1.35fr 0.95fr;
  gap: 32px;
  align-items: center;
}

.hero-title {
  font-size: clamp(2rem, 3.8vw, 2.85rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}

.hero-title span {
  background: linear-gradient(120deg, var(--primary-sky), var(--accent-lavender));
  padding: 2px 12px;
  border-radius: 12px;
}

.hero-desc {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, #4299E1, #667EEA);
  color: white;
  font-weight: 800;
  font-size: 1.05rem;
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  text-decoration: none;
  box-shadow: 0 10px 22px rgba(66, 153, 225, 0.35);
  transition: transform 0.25s ease;
}

.cta-btn:hover {
  transform: translateY(-3px);
}

.hero-mascot-card {
  background: white;
  border-radius: 24px;
  padding: 24px;
  border: 2px solid var(--border-light);
  box-shadow: var(--shadow-soft);
  text-align: center;
}

.student-quote-box {
  margin-top: 12px;
  background: #F7FAFC;
  border-left: 4px solid #4299E1;
  padding: 12px 14px;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 700;
  text-align: left;
}

/* SECTION 1: EXPLAIN GENERATIVE AI IN MY OWN WORDS */
.explain-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 26px;
}

.explain-card {
  background: var(--card-bg);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-soft);
}

.explain-card h3 {
  font-size: 1.3rem;
  font-weight: 800;
  margin: 10px 0;
}

.analogy-banner {
  background: linear-gradient(135deg, var(--accent-butter), var(--accent-peach));
  border-radius: 22px;
  padding: 24px 28px;
  border: 2px solid rgba(151, 90, 22, 0.2);
  box-shadow: var(--shadow-soft);
}

.analogy-banner h4 {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 8px;
}

/* SECTION 2: REAL STUDY TASK + PROMPT + GEMINI OUTPUT */
.subject-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 26px;
}

.subj-btn {
  background: white;
  border: 2px solid var(--border-light);
  padding: 12px 22px;
  border-radius: var(--radius-pill);
  font-family: inherit;
  font-weight: 800;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.subj-btn.active {
  background: linear-gradient(135deg, var(--primary-sky), var(--accent-lavender));
  border-color: var(--primary-sky-dark);
  transform: translateY(-2px);
}

.study-workspace {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 24px;
}

.prompt-panel,
.output-panel {
  background: var(--card-bg);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow-soft);
}

.bad-prompt-box {
  background: #FFF5F5;
  border: 1.5px dashed #FC8181;
  border-radius: 14px;
  padding: 12px 15px;
  margin-bottom: 16px;
  font-size: 0.9rem;
}

.good-prompt-box {
  background: #F0FFF4;
  border: 2px solid #68D391;
  border-radius: 16px;
  padding: 16px;
  margin-bottom: 14px;
  font-size: 0.93rem;
}

.formula-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin: 10px 0;
}

.formula-tag {
  font-size: 0.76rem;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: white;
  border: 1px solid rgba(0,0,0,0.1);
}

.action-btn {
  background: #3182CE;
  color: white;
  border: none;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  font-family: inherit;
  font-weight: 800;
  font-size: 0.88rem;
  cursor: pointer;
  transition: all 0.2s;
}

.action-btn:hover {
  background: #2B6CB0;
  transform: scale(1.03);
}

.gemini-result-box {
  background: #F8FAFC;
  border-radius: 16px;
  padding: 18px;
  border: 1.5px solid #E2E8F0;
  font-size: 0.93rem;
  margin-bottom: 14px;
}

.gemini-result-box ul {
  padding-left: 18px;
  margin-top: 8px;
}

.gemini-result-box li {
  margin-bottom: 6px;
}

/* Highlighted Fact-check spans */
.fact-verified {
  background: transparent;
  transition: all 0.3s ease;
  padding: 2px 4px;
  border-radius: 6px;
}

.fact-verified.checked-green {
  background: #C6F6D5;
  color: #22543D;
  font-weight: 800;
}

.fact-caution {
  background: transparent;
  transition: all 0.3s ease;
  padding: 2px 4px;
  border-radius: 6px;
}

.fact-caution.checked-orange {
  background: #FEEBC8;
  color: #744210;
  font-weight: 800;
}

.fact-check-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  background: #EBF8FF;
  padding: 12px 16px;
  border-radius: 14px;
  border: 1.5px solid #90CDF4;
}

.google-check-btn {
  background: white;
  border: 2px solid #3182CE;
  color: #2B6CB0;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-family: inherit;
  font-weight: 800;
  font-size: 0.86rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
}

.google-check-btn:hover {
  background: #3182CE;
  color: white;
}

/* SECTION 3: SAFETY & FACT-CHECKING RULES */
.safety-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.safety-card {
  background: var(--card-bg);
  border: 2px solid var(--border-light);
  border-radius: 20px;
  padding: 22px;
  box-shadow: var(--shadow-soft);
  transition: transform 0.25s ease;
}

.safety-card:hover {
  transform: translateY(-5px);
}

.safety-icon {
  font-size: 2rem;
  margin-bottom: 10px;
}

.safety-card h4 {
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.safety-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* SECTION 4: NEED <-> SOLUTION MATCHER FOR NEW LEARNERS */
.matcher-bar {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.need-btn {
  background: white;
  border: 2px solid var(--border-light);
  padding: 12px 20px;
  border-radius: var(--radius-pill);
  font-family: inherit;
  font-weight: 800;
  font-size: 0.92rem;
  cursor: pointer;
  transition: all 0.2s;
}

.need-btn.active {
  background: var(--accent-mint);
  border-color: var(--accent-mint-dark);
  color: var(--accent-mint-dark);
  transform: translateY(-2px);
}

.matcher-card {
  background: var(--card-bg);
  border: 2.5px solid var(--border-light);
  border-radius: 26px;
  padding: 30px;
  box-shadow: var(--shadow-soft);
  max-width: 880px;
  margin: 0 auto;
}

/* SECTION 5: RUBRIC IMPACT & ROADMAP */
.rubric-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.rubric-box {
  background: var(--card-bg);
  border: 2px solid var(--border-light);
  border-radius: 22px;
  padding: 24px;
  box-shadow: var(--shadow-soft);
}

.rubric-box h3 {
  font-size: 1.15rem;
  font-weight: 800;
  margin: 10px 0;
}

.rubric-box ul {
  padding-left: 18px;
  font-size: 0.9rem;
  font-weight: 600;
}

.rubric-box li {
  margin-bottom: 8px;
}

/* MINI QUIZ & CELEBRATION */
.quiz-card {
  background: linear-gradient(135deg, rgba(216, 236, 255, 0.65), rgba(233, 216, 253, 0.65));
  border-radius: 28px;
  padding: 38px 28px;
  text-align: center;
  max-width: 820px;
  margin: 0 auto;
  border: 2px solid white;
  box-shadow: var(--shadow-soft);
}

.quiz-options {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin: 20px 0;
}

.quiz-opt-btn {
  background: white;
  border: 2px solid var(--border-light);
  padding: 12px 20px;
  border-radius: 16px;
  font-family: inherit;
  font-weight: 700;
  font-size: 0.92rem;
  cursor: pointer;
  transition: all 0.2s;
}

.quiz-opt-btn:hover {
  border-color: #3182CE;
  transform: translateY(-2px);
}

#confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 999;
}

@media (max-width: 920px) {
  .hero-card,
  .explain-grid,
  .study-workspace,
  .safety-grid,
  .rubric-grid {
    grid-template-columns: 1fr;
  }
  .navbar {
    flex-direction: column;
    border-radius: 20px;
  }
}