/* ============================================================
   WEB AR — MODUL MATEMATIKA DEFORESTASI (SDGs)
   Desain Modern, Mobile-First, Bersih, Nuansa Alam Hijau
   ============================================================ */

:root {
  --primary-dark: #0f2d1a;
  --green-deep:    #164426;
  --green-main:    #23733f;
  --green-vibrant: #2ecc71;
  --green-soft:    #eaf5ee;
  --green-border:  #c2e3cc;
  --gold-accent:   #f59e0b;
  --gold-soft:     #fef3c7;
  
  --text-primary:  #1e293b;
  --text-muted:    #64748b;
  --text-light:    #94a3b8;
  --bg-page:       #f8faf9;
  --bg-surface:    #ffffff;
  --bg-alt:        #f1f5f2;

  --font-base:     'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --radius-sm:     8px;
  --radius-md:     14px;
  --radius-lg:     24px;
  --shadow-sm:     0 2px 8px rgba(15, 45, 26, 0.06);
  --shadow-md:     0 8px 24px rgba(15, 45, 26, 0.08);
  --shadow-lg:     0 20px 40px rgba(15, 45, 26, 0.12);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-base);
  background-color: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
  transition: all 0.2s ease;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ============================================================
   NAVBAR & NAVIGATION
   ============================================================ */
.navbar {
  position: sticky;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(22, 68, 38, 0.08);
  z-index: 1000;
  transition: background 0.3s;
}

.nav-container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  font-size: 1.8rem;
  line-height: 1;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--primary-dark);
  letter-spacing: -0.02em;
}

.logo-sub {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--green-main);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-muted);
  position: relative;
  padding: 4px 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--green-main);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2.5px;
  background: var(--green-main);
  border-radius: 2px;
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-nav {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--green-main);
  color: white !important;
  padding: 9px 18px;
  border-radius: 50px;
  font-size: 0.88rem;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(35, 115, 63, 0.25);
  transition: transform 0.2s, background 0.2s;
}

.btn-nav:hover {
  background: var(--green-deep);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2.5px;
  background: var(--primary-dark);
  border-radius: 2px;
  transition: 0.3s;
}

/* Mobile Dropdown Menu */
.mobile-menu {
  display: none;
  flex-direction: column;
  background: white;
  padding: 16px 20px 24px;
  border-bottom: 1px solid var(--green-border);
  box-shadow: var(--shadow-md);
}

.mobile-menu.show {
  display: flex;
}

.mobile-link {
  padding: 12px 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 1px solid rgba(0,0,0,0.05);
}

.mobile-cta {
  margin-top: 16px;
}

/* ============================================================
   BUTTONS & BADGES
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--green-main) 0%, var(--green-deep) 100%);
  color: white !important;
  box-shadow: 0 6px 20px rgba(22, 68, 38, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(22, 68, 38, 0.4);
}

.btn-secondary {
  background: white;
  color: var(--primary-dark) !important;
  border: 1.5px solid var(--green-border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--green-soft);
  border-color: var(--green-main);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1rem;
}

.btn-outline-sm {
  display: inline-block;
  text-align: center;
  padding: 8px 16px;
  background: var(--green-soft);
  color: var(--green-deep) !important;
  font-weight: 700;
  font-size: 0.85rem;
  border-radius: 50px;
  border: 1px solid var(--green-border);
  margin-top: 12px;
}

.btn-outline-sm:hover {
  background: var(--green-main);
  color: white !important;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: 50px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.pill-green {
  background: var(--green-soft);
  color: var(--green-deep);
  border: 1px solid var(--green-border);
}

.pill-gold {
  background: var(--gold-soft);
  color: #92400e;
  border: 1px solid #fde68a;
}

/* ============================================================
   HERO PREMIUM SECTION
   ============================================================ */
.hero-premium {
  position: relative;
  overflow: hidden;
  background: radial-gradient(circle at 10% 20%, #eaf5ee 0%, #f8faf9 70%);
  padding: 60px 20px 80px;
}

.hero-grid {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
}

.hero-tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.hero-title {
  font-size: clamp(2.2rem, 4.5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--primary-dark);
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.text-gradient {
  background: linear-gradient(135deg, var(--green-main) 0%, #10b981 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 580px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-top: 24px;
  border-top: 1px solid rgba(0,0,0,0.08);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--green-deep);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 600;
}

.stat-divider {
  width: 1px;
  height: 36px;
  background: rgba(0,0,0,0.1);
}

/* Hero Feature Box / Video Live Card */
.hero-preview-box {
  position: relative;
}

.preview-badge {
  position: absolute;
  top: -12px;
  right: 20px;
  background: var(--gold-accent);
  color: #000;
  padding: 4px 14px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 800;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.35);
  z-index: 10;
}

.card-glass {
  background: white;
  border-radius: var(--radius-lg);
  padding: 14px;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(22, 68, 38, 0.1);
  overflow: hidden;
}

.preview-video-box {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #000;
  aspect-ratio: 16 / 10;
}

.hero-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-overlay-tag {
  position: absolute;
  bottom: 12px;
  left: 12px;
  background: rgba(0,0,0,0.65);
  backdrop-filter: blur(4px);
  color: white;
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
}

.preview-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 8px 8px;
}

.preview-text h4 {
  font-size: 0.95rem;
  color: var(--primary-dark);
  font-weight: 700;
}

.preview-text p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.btn-circle {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--green-main);
  color: white !important;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
  transition: transform 0.2s, background 0.2s;
}

.btn-circle:hover {
  background: var(--green-deep);
  transform: scale(1.08);
}

/* ============================================================
   FEATURES BAR
   ============================================================ */
.features-bar {
  background: white;
  border-top: 1px solid var(--green-border);
  border-bottom: 1px solid var(--green-border);
  padding: 24px 0;
}

.feature-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 16px;
}

.feat-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--green-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.feature-item h4 {
  font-size: 0.95rem;
  color: var(--primary-dark);
  font-weight: 700;
  margin-bottom: 2px;
}

.feature-item p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ============================================================
   SECTIONS GENERAL
   ============================================================ */
.section {
  padding: 80px 0;
}

.bg-light {
  background-color: var(--bg-alt);
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--green-main);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 3vw, 2.3rem);
  font-weight: 800;
  color: var(--primary-dark);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-header p {
  font-size: 1rem;
  color: var(--text-muted);
}

.grid-cards-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

/* ============================================================
   COURSE / MATERI CARDS
   ============================================================ */
.course-card {
  background: white;
  border-radius: var(--radius-md);
  padding: 32px 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0,0,0,0.06);
  display: flex;
  flex-direction: column;
  transition: transform 0.2s, box-shadow 0.2s;
}

.course-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.card-icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 20px;
}

.card-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--green-main);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.course-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 12px;
  line-height: 1.4;
}

.course-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 24px;
  flex-grow: 1;
}

.link-arrow {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--green-main);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.link-arrow:hover {
  color: var(--green-deep);
  gap: 8px;
}

/* ============================================================
   MARKER CARDS
   ============================================================ */
.marker-box {
  background: white;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0,0,0,0.06);
  display: flex;
  flex-direction: column;
  transition: transform 0.2s, box-shadow 0.2s;
}

.marker-box:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.marker-img-wrap {
  position: relative;
  height: 200px;
  background: #eee;
  overflow: hidden;
}

.marker-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}

.marker-box:hover .marker-img-wrap img {
  transform: scale(1.05);
}

.marker-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.4);
  opacity: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.2s;
}

.marker-img-wrap:hover .marker-overlay {
  opacity: 1;
}

.btn-marker-zoom {
  background: white;
  color: var(--primary-dark);
  padding: 8px 16px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 700;
}

.marker-meta {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.marker-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--green-deep);
  background: var(--green-soft);
  padding: 2px 10px;
  border-radius: 50px;
  margin-bottom: 8px;
  width: fit-content;
}

.marker-meta h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 6px;
}

.marker-meta p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

/* ============================================================
   STEPS GRID (01, 02, 03)
   ============================================================ */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.step-card {
  background: white;
  border-radius: var(--radius-md);
  padding: 32px 24px;
  border: 1px solid rgba(0,0,0,0.06);
  position: relative;
}

.step-num {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--green-soft);
  line-height: 1;
  margin-bottom: 16px;
  letter-spacing: -0.04em;
}

.step-body h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 10px;
}

.step-body p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ============================================================
   ABOUT / SDGs CARD
   ============================================================ */
.about-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--green-border);
}

.about-header {
  margin-bottom: 32px;
  border-bottom: 1px solid rgba(0,0,0,0.06);
  padding-bottom: 24px;
}

.about-header h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary-dark);
  margin: 12px 0 8px;
}

.about-lead {
  font-size: 1rem;
  color: var(--text-muted);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.about-col h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--green-deep);
  margin-bottom: 16px;
}

.about-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.about-list li {
  font-size: 0.9rem;
  color: var(--text-primary);
  line-height: 1.5;
}

/* ============================================================
   SITE FOOTER
   ============================================================ */
.site-footer {
  background: var(--primary-dark);
  color: white;
  padding: 60px 0 24px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  margin-bottom: 24px;
}

.footer-left p {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.65);
  max-width: 440px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: rgba(255,255,255,0.8);
  font-size: 0.9rem;
  font-weight: 600;
}

.footer-links a:hover {
  color: var(--green-vibrant);
}

.footer-bottom {
  text-align: center;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.45);
}

/* ============================================================
   RESPONSIVE DESIGN (TABLETS & PHONES)
   ============================================================ */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .feature-row {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .grid-cards-3,
  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

@media (max-width: 768px) {
  .nav-menu,
  .nav-cta .btn-nav {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
  .grid-cards-3,
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .hero-actions {
    flex-direction: column;
  }
  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }
  .footer-content {
    flex-direction: column;
    gap: 24px;
    text-align: center;
  }
}