/* ==========================================================
   CSS Stylesheet - Kampanye Konservasi & Hemat Energi
   ESD (Education for Sustainable Development)
   Refined for Ultra-Smooth Interactions, Warm Aesthetic, & Polished Transitions
   ========================================================== */

:root {
  --primary-color: #0d9488;      /* Deep Teal */
  --primary-dark: #0f766e;
  --primary-light: #f0fdfa;
  --primary-border: #ccfbf1;
  --accent-color: #b45309;       /* Deep Solar Ochre */
  --text-main: #0f172a;          /* Slate 900 */
  --text-muted: #334155;         /* Slate 700 - WCAG AAA / AA compliant */
  --text-light: #64748b;         /* Slate 500 */
  --bg-main: #fbfdfc;            /* Clean warm paper white */
  --bg-card: #ffffff;
  --bg-subtle: #f8fafc;
  --border-color: #e2e8f0;
  --border-strong: #cbd5e1;
  --font-heading: 'Newsreader', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.04), 0 1px 2px rgba(15, 23, 42, 0.02);
  --shadow-md: 0 4px 16px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
  --shadow-hover: 0 10px 25px -4px rgba(15, 23, 42, 0.08), 0 4px 10px -2px rgba(15, 23, 42, 0.04);
  --ease-smooth: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.2s var(--ease-smooth);
  --transition-normal: all 0.35s var(--ease-smooth);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--text-main);
  background-color: var(--bg-main);
  line-height: 1.65;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ================= ACCESSIBILITY (R-32) ================= */
:focus-visible {
  outline: 2.5px solid #0f766e;
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  top: -50px;
  left: 1rem;
  background: var(--primary-dark);
  color: #ffffff;
  padding: 8px 16px;
  z-index: 9999;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  transition: top 0.25s var(--ease-smooth);
}

.skip-link:focus {
  top: 1rem;
}

.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ================= SVG ICON HELPER ================= */
.icon-svg {
  display: inline-block;
  width: 1.2em;
  height: 1.2em;
  vertical-align: -0.2em;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ================= HEADER & NAVIGATION ================= */
.site-header {
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition-normal);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
  transition: transform 0.25s var(--ease-smooth);
}

.brand-logo:hover {
  transform: scale(1.02);
}

.brand-symbol {
  width: 36px;
  height: 36px;
  background-color: var(--primary-dark);
  color: #ffffff;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(15, 118, 110, 0.2);
  transition: var(--transition-fast);
}

.brand-symbol svg {
  width: 18px;
  height: 18px;
}

.brand-title {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.brand-title span {
  color: var(--primary-dark);
  font-style: italic;
}

.nav-menu {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 0.5rem;
}

.nav-link {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.92rem;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

.nav-link:hover {
  color: var(--primary-dark);
  background-color: var(--primary-light);
  transform: translateY(-1px);
}

.nav-link.active {
  color: var(--primary-dark);
  background-color: var(--primary-light);
  font-weight: 600;
}

.badge-phase {
  font-size: 0.68rem;
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  background-color: #f1f5f9;
  color: #475569;
  margin-left: 0.4rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border: 1px solid #e2e8f0;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0.5rem;
  min-width: 44px;
  min-height: 44px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--text-main);
  margin: 4px 0;
  border-radius: 1px;
  transition: var(--transition-fast);
}

/* ================= BUTTONS ================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  cursor: pointer;
  border: 1px solid transparent;
  min-height: 44px;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background-color: var(--primary-dark);
  color: #ffffff;
  box-shadow: 0 2px 6px rgba(15, 118, 110, 0.2);
}

.btn-primary:hover {
  background-color: #115e59;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(15, 118, 110, 0.3);
}

.btn-secondary {
  background-color: #ffffff;
  color: var(--text-main);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: #f8fafc;
  border-color: var(--text-muted);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ================= HERO SECTION ================= */
.hero-section {
  padding: 4.5rem 0 4rem;
  background: linear-gradient(180deg, #f0fdfa 0%, #ffffff 100%);
  border-bottom: 1px solid var(--border-color);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 3.5rem;
  align-items: start;
}

.hero-kicker {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--primary-dark);
  margin-bottom: 0.75rem;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 2.9rem;
  line-height: 1.15;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.hero-title em {
  font-style: italic;
  font-weight: 400;
  color: var(--primary-dark);
}

.hero-tagline {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
}

/* ================= INTERACTIVE SIMULATOR CARD ================= */
.hero-interactive-card {
  background: #ffffff;
  padding: 1.85rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  transition: var(--transition-normal);
}

.hero-interactive-card:hover {
  box-shadow: var(--shadow-hover);
  border-color: #cbd5e1;
}

.card-header-sim {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
  margin-bottom: 1.25rem;
}

.card-header-sim h3 {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  color: var(--text-main);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card-header-sim p {
  font-size: 0.86rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.calc-checklist {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.calc-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0.95rem;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--text-main);
  cursor: pointer;
  transition: var(--transition-fast);
}

.calc-item:hover {
  background-color: #ffffff;
  border-color: var(--primary-dark);
  transform: translateX(3px);
  box-shadow: var(--shadow-sm);
}

.calc-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--primary-dark);
  margin-left: 0.75rem;
  transition: transform 0.2s var(--ease-smooth);
}

.calc-item input[type="checkbox"]:active {
  transform: scale(0.9);
}

.calc-result-box {
  margin-top: 1.25rem;
  padding: 1.15rem;
  background: linear-gradient(135deg, #f0fdfa 0%, #e6fcf5 100%);
  border: 1px solid #99f6e4;
  border-radius: var(--radius-sm);
  text-align: center;
  transition: var(--transition-normal);
}

.calc-result-box .result-title {
  font-size: 0.75rem;
  color: var(--primary-dark);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.calc-result-box .result-value {
  font-family: var(--font-heading);
  font-size: 1.65rem;
  font-weight: 700;
  color: #042f2e;
  margin: 0.15rem 0;
  transition: transform 0.25s var(--ease-smooth), color 0.25s var(--ease-smooth);
}

.calc-result-box.is-updating .result-value {
  transform: scale(1.06);
  color: var(--primary-dark);
}

.calc-result-box .result-desc {
  font-size: 0.82rem;
  color: #0f766e;
  line-height: 1.45;
}

/* ================= SECTION STYLES ================= */
.section {
  padding: 5rem 0;
}

.section-alt {
  background-color: #ffffff;
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  max-width: 680px;
  margin: 0 auto 3.5rem;
  text-align: center;
}

.section-kicker {
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--primary-dark);
  margin-bottom: 0.5rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* ================= CARDS & GRIDS ================= */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.feature-card {
  background: var(--bg-card);
  padding: 2rem 1.75rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: var(--transition-normal);
}

.feature-card:hover {
  border-color: #99f6e4;
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.feature-icon-wrap {
  width: 44px;
  height: 44px;
  background-color: var(--primary-light);
  color: var(--primary-dark);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  border: 1px solid var(--primary-border);
  transition: var(--transition-fast);
}

.feature-card:hover .feature-icon-wrap {
  background-color: var(--primary-dark);
  color: #ffffff;
  transform: scale(1.05);
}

.feature-icon-wrap svg {
  width: 22px;
  height: 22px;
}

.feature-card h3 {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  margin-bottom: 0.65rem;
  color: var(--text-main);
  font-weight: 700;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.65;
}

/* ================= ABOUT / PURPOSE SECTION ================= */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3.5rem;
  align-items: start;
}

.about-content h2 {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 1.1rem;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

.about-content p {
  color: var(--text-muted);
  margin-bottom: 1.1rem;
  font-size: 0.98rem;
  line-height: 1.7;
}

.about-list {
  list-style: none;
  margin: 1.5rem 0;
}

.about-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  margin-bottom: 1rem;
  color: var(--text-main);
  font-size: 0.95rem;
  line-height: 1.6;
}

.check-mark {
  width: 20px;
  height: 20px;
  color: var(--primary-dark);
  flex-shrink: 0;
  margin-top: 0.15rem;
}

.team-badge-box {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  padding: 1.75rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.team-badge-box h4 {
  font-family: var(--font-heading);
  color: var(--text-main);
  margin-bottom: 0.6rem;
  font-size: 1.25rem;
  font-weight: 700;
}

.team-info-list {
  list-style: none;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.team-info-list li {
  margin-bottom: 0.6rem;
}

.team-info-list strong {
  color: var(--text-main);
}

.mapel-card {
  padding: 0.7rem 0.9rem;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.86rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: var(--transition-fast);
}

.mapel-card:hover {
  border-color: var(--primary-dark);
  transform: translateX(3px);
}

.mapel-card svg {
  width: 17px;
  height: 17px;
  color: var(--primary-dark);
  flex-shrink: 0;
}

/* ================= TEASER / ROADMAP SECTION ================= */
.teaser-box {
  background: #042f2e;
  color: #ffffff;
  border-radius: var(--radius-lg);
  padding: 3.5rem 2.5rem;
  text-align: center;
  box-shadow: var(--shadow-md);
}

.teaser-box h2 {
  font-family: var(--font-heading);
  font-size: 2.3rem;
  margin-bottom: 0.75rem;
  font-weight: 700;
}

.teaser-box p {
  font-size: 1.05rem;
  color: #ccfbf1;
  max-width: 600px;
  margin: 0 auto 2rem;
}

.phases-preview {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  text-align: left;
}

.phase-item {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 1.4rem;
  border-radius: var(--radius-md);
  transition: var(--transition-normal);
}

.phase-item:hover {
  background: rgba(255, 255, 255, 0.09);
  transform: translateY(-2px);
}

.phase-item.current {
  background: #ffffff;
  color: var(--text-main);
  border-color: #ffffff;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.phase-item.current .phase-num {
  background-color: var(--primary-dark);
  color: #ffffff;
}

.phase-item.current h4 {
  color: var(--text-main);
}

.phase-item.current p {
  color: var(--text-muted);
}

.phase-num {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.2);
  margin-bottom: 0.6rem;
  letter-spacing: 0.04em;
}

.phase-item h4 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  margin-bottom: 0.35rem;
  color: #ffffff;
  font-weight: 700;
}

.phase-item p {
  font-size: 0.85rem;
  color: #ccfbf1;
  line-height: 1.55;
}

/* ================= PLACEHOLDER SECTION ================= */
.placeholder-card {
  text-align: center;
  padding: 3.5rem 2rem;
  background: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}

.placeholder-card:hover {
  box-shadow: var(--shadow-md);
}

.placeholder-icon-wrap {
  width: 56px;
  height: 56px;
  background-color: var(--primary-light);
  color: var(--primary-dark);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
  border: 1px solid var(--primary-border);
  transition: transform 0.3s var(--ease-smooth);
}

.placeholder-card:hover .placeholder-icon-wrap {
  transform: scale(1.08);
}

.placeholder-icon-wrap svg {
  width: 28px;
  height: 28px;
}

/* ================= FOOTER ================= */
.site-footer {
  background-color: #0f172a;
  color: #94a3b8;
  padding: 3.5rem 0 2rem;
  margin-top: auto;
  border-top: 1px solid #1e293b;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 2.5rem;
}

.footer-brand .brand-title {
  color: #ffffff;
  font-size: 1.35rem;
  margin-bottom: 0.6rem;
}

.footer-brand p {
  font-size: 0.88rem;
  line-height: 1.65;
  max-width: 360px;
}

.footer-links h4 {
  color: #f8fafc;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  margin-bottom: 0.85rem;
  font-weight: 700;
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.4rem;
}

.footer-links a {
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.88rem;
  transition: var(--transition-fast);
  display: inline-block;
  padding: 0.15rem 0;
}

.footer-links a:hover {
  color: #5eead4;
  transform: translateX(2px);
}

.footer-bottom {
  padding-top: 1.75rem;
  border-top: 1px solid #1e293b;
  text-align: center;
  font-size: 0.82rem;
}

/* ================= SCROLL REVEAL ANIMATIONS (SMOOTH & SUBTLE) ================= */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s var(--ease-smooth), transform 0.6s var(--ease-smooth);
  will-change: opacity, transform;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ================= RESPONSIVE DESIGN (R-03) ================= */
@media (max-width: 900px) {
  .hero-grid,
  .about-grid,
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .grid-3,
  .phases-preview {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: 2.35rem;
  }

  .section-title {
    font-size: 2rem;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-menu {
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    align-items: flex-start;
    padding: 1.25rem;
    gap: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
    display: none;
    transform: translateY(-8px);
    opacity: 0;
    transition: transform 0.25s var(--ease-smooth), opacity 0.25s var(--ease-smooth);
  }

  .nav-menu.is-active {
    display: flex;
    transform: translateY(0);
    opacity: 1;
  }

  .nav-link {
    width: 100%;
    padding: 0.75rem;
  }
}