/* ==========================================================================
   1. RESET & BASE STYLES
   ========================================================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #0056b3;     /* Biru Utama Tulus Water */
  --primary-hover: #003d80;
  --secondary-color: #00a8ec;   /* Biru Cerah/Cyan */
  --accent-color: #00d2ff;
  --text-dark: #222222;
  --text-muted: #666666;
  --bg-light: #f4f8fb;
  --bg-white: #ffffff;
  --border-color: #e2e8f0;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 15px rgba(0, 86, 179, 0.08);
  --radius: 12px;
  --transition: all 0.3s ease;
}

html {
  scroll-behavior: smooth;
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-dark);
  line-height: 1.6;
}

body {
  background-color: var(--bg-white);
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

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

/* ==========================================================================
   2. LAYOUT & CONTAINERS
   ========================================================================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section-padding {
  padding: 80px 0;
}

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

.text-center {
  text-align: center;
}

.section-title {
  margin-bottom: 40px;
}

.section-title h2 {
  font-size: 2.2rem;
  color: var(--primary-color);
  margin-bottom: 12px;
  font-weight: 800;
}

.section-title p {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 700px;
  margin: 0 auto;
}

/* GRIDS */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.grid-5 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

/* ==========================================================================
   3. BUTTONS & BADGES
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 24px;
  font-weight: 700;
  border-radius: 50px;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-size: 0.95rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(0, 168, 236, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-hover), var(--primary-color));
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0, 168, 236, 0.4);
}

.btn-outline {
  background: transparent;
  color: #ffffff;
  border: 2px solid #ffffff;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.1rem;
}

.badge {
  display: inline-block;
  background-color: rgba(0, 168, 236, 0.12);
  color: var(--primary-color);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}

/* ==========================================================================
   4. NAVBAR
   ========================================================================== */
.navbar {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  box-shadow: var(--shadow-sm);
  padding: 15px 0;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo img {
  height: 45px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  font-weight: 600;
  color: var(--text-dark);
  transition: var(--transition);
  font-size: 0.95rem;
}

.nav-links a:hover {
  color: var(--secondary-color);
}


/* ==========================================================================
   6. ABOUT SECTION & CONCEPT FLOW
   ========================================================================== */
.concept-card {
  background: #ffffff;
  border-radius: var(--radius);
  padding: 40px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  margin-top: 30px;
  text-align: center;
}

.concept-card h3 {
  color: var(--primary-color);
  margin-bottom: 30px;
  font-size: 1.4rem;
}

.concept-flow {
  display: flex;
  align-items: center;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 15px;
  margin-bottom: 25px;
}

.flow-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 140px;
}

.flow-icon {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  background: var(--bg-light);
  color: var(--secondary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  box-shadow: var(--shadow-sm);
}

.flow-step span {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--primary-color);
}

.flow-arrow {
  color: var(--secondary-color);
  font-size: 1.2rem;
}

.concept-note {
  font-style: italic;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ==========================================================================
   7. BENEFITS SECTION
   ========================================================================== */
.benefit-card {
  background: #ffffff;
  padding: 30px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.benefit-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--secondary-color);
}

.b-icon {
  width: 55px;
  height: 55px;
  background: rgba(0, 168, 236, 0.1);
  color: var(--secondary-color);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.benefit-card h3 {
  font-size: 1.2rem;
  color: var(--primary-color);
  margin-bottom: 10px;
}

.benefit-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ==========================================================================
   8. TARGET AUDIENCE SECTION
   ========================================================================== */
.target-item {
  background: #ffffff;
  padding: 20px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  gap: 15px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.target-item i {
  font-size: 1.5rem;
  color: var(--secondary-color);
}

.target-item span {
  font-weight: 600;
  font-size: 0.95rem;
}

.highlight-banner {
  margin-top: 40px;
  background: rgba(0, 168, 236, 0.1);
  border-left: 4px solid var(--secondary-color);
  padding: 20px 30px;
  border-radius: 8px;
  text-align: center;
  font-size: 1.1rem;
  color: var(--primary-color);
}

/* ==========================================================================
   9. STEPS / HOW TO JOIN
   ========================================================================== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-bottom: 50px;
}

.step-card {
  background: #ffffff;
  padding: 35px 25px;
  border-radius: var(--radius);
  position: relative;
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.step-num {
  width: 50px;
  height: 50px;
  background: var(--primary-color);
  color: #ffffff;
  font-weight: 800;
  font-size: 1.2rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.step-card h3 {
  color: var(--primary-color);
  margin-bottom: 10px;
}

.cta-banner {
  background: linear-gradient(135deg, var(--primary-color), #003d80);
  color: #ffffff;
  padding: 45px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

.cta-banner h3 {
  font-size: 1.8rem;
  margin-bottom: 20px;
}

.cta-banner .disclaimer {
  margin-top: 15px;
  font-size: 0.85rem;
  opacity: 0.8;
}

/* ==========================================================================
   10. PRODUCTS SECTION
   ========================================================================== */
.product-card {
  background: #ffffff;
  border-radius: var(--radius);
  padding: 25px 15px;
  border: 1px solid var(--border-color);
  text-align: center;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.product-card:hover {
  border-color: var(--secondary-color);
  box-shadow: var(--shadow-md);
}

.product-img {
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 15px;
}

.product-img img {
  max-height: 100%;
  object-fit: contain;
}

.product-card h4 {
  font-size: 1.2rem;
  color: var(--primary-color);
  margin-bottom: 8px;
}

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

/* ==========================================================================
   11. WHY TULUS WATER
   ========================================================================== */
.why-card {
  background: #ffffff;
  padding: 30px;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  text-align: center;
}

.why-card i {
  font-size: 2.2rem;
  color: var(--secondary-color);
  margin-bottom: 15px;
}

.why-card h4 {
  color: var(--primary-color);
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.why-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ==========================================================================
   12. FAQ ACCORDION
   ========================================================================== */
.faq-accordion {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 18px 24px;
  box-shadow: var(--shadow-sm);
}

.faq-item summary {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--primary-color);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary i {
  transition: transform 0.3s ease;
  font-size: 0.9rem;
  color: var(--secondary-color);
}

.faq-item[open] summary i {
  transform: rotate(180deg);
}

.faq-answer {
  margin-top: 12px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ==========================================================================
   13. FINAL CTA & CONTACT
   ========================================================================== */
.final-cta-section {
  background: linear-gradient(180deg, #eef7ff 0%, #0056b3 100%);
  color: #ffffff;
  padding: 80px 0;
}

.final-cta-section h2 {
  font-size: 2.4rem;
  margin-bottom: 20px;
}

.final-cta-list {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 30px;
  flex-wrap: wrap;
  margin-bottom: 30px;
  font-size: 1.1rem;
}

.final-cta-list i {
  color: var(--accent-color);
}

.final-cta-section h3 {
  font-size: 1.5rem;
  margin-bottom: 30px;
  letter-spacing: 1px;
}

.contact-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 25px;
  flex-wrap: wrap;
}

.contact-btn {
  background: rgba(255, 255, 255, 0.15);
  padding: 10px 20px;
  border-radius: 30px;
  color: #ffffff;
  font-size: 0.95rem;
  backdrop-filter: blur(5px);
  transition: var(--transition);
}

.contact-btn:hover {
  background: #ffffff;
  color: var(--primary-color);
}

/* ==========================================================================
   14. FOOTER
   ========================================================================== */
.footer {
  background: #002e60;
  color: #ffffff;
  padding: 40px 0 20px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 30px;
  margin-bottom: 20px;
}

.footer-brand p {
  font-size: 0.85rem;
  opacity: 0.7;
  margin-top: 5px;
}

.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-links a {
  font-size: 0.9rem;
  opacity: 0.8;
  transition: var(--transition);
}

.footer-links a:hover {
  opacity: 1;
  color: var(--accent-color);
}

.footer-bottom {
  font-size: 0.85rem;
  opacity: 0.6;
}

/* ==========================================================================
   15. RESPONSIVE BREAKPOINTS
   ========================================================================== */
@media (max-width: 992px) {
  .hero-container {
    flex-direction: column;
    text-align: center;
  }

  .hero-content p {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-cta-group {
    align-items: center;
  }

  .hero-image {
    justify-content: center;
  }

  .hero-image img {
    max-height: 320px;
  }

  .nav-links {
    display: none;
  }
}

@media (max-width: 768px) {
  .section-padding {
    padding: 50px 0;
  }

  .hero-content h1 {
    font-size: 2.1rem;
  }

  .flow-arrow {
    transform: rotate(90deg);
    margin: 5px 0;
  }

  .concept-flow {
    flex-direction: column;
  }

  .final-cta-list {
    flex-direction: column;
    gap: 10px;
  }
}