:root {
  --bg-dark: #0b0f17;
  --bg-card: rgba(18, 26, 42, 0.7);
  --bg-card-hover: rgba(28, 38, 60, 0.85);
  --border-color: rgba(255, 255, 255, 0.1);
  --border-glow: rgba(16, 185, 129, 0.3);
  
  --primary-emerald: #10b981;
  --primary-glow: #059669;
  --accent-cyan: #06b6d4;
  --accent-amber: #f59e0b;
  --accent-purple: #8b5cf6;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --font-heading: 'Outfit', system-ui, -apple-system, sans-serif;
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-family);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4, .font-heading {
  font-family: var(--font-heading);
  letter-spacing: -0.02em;
}

.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Glassmorphism Cards */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.glass-card:hover {
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(11, 15, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 14px 0;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

.nav-logo-img {
  height: 38px;
  width: auto;
  display: block;
}

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

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-emerald), #059669);
  color: #fff;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.5);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.3);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.05rem;
  border-radius: 12px;
}

.btn-xl {
  padding: 18px 36px;
  font-size: 1.15rem;
  border-radius: 14px;
}

.shadow-glow {
  box-shadow: 0 0 25px rgba(16, 185, 129, 0.4);
}

/* Hero Section */
.hero-section {
  position: relative;
  padding-top: 150px;
  padding-bottom: 90px;
  overflow: hidden;
}

.hero-bg-glow {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 500px;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.18) 0%, rgba(6, 182, 212, 0.1) 40%, rgba(11, 15, 23, 0) 70%);
  pointer-events: none;
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 30px;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--primary-emerald);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary-emerald);
  box-shadow: 0 0 10px var(--primary-emerald);
}

.hero-title {
  font-size: 3.2rem;
  line-height: 1.15;
  font-weight: 800;
  margin-bottom: 20px;
}

.gradient-text {
  background: linear-gradient(135deg, #10b981 0%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  max-width: 540px;
}

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

.hero-stats {
  display: flex;
  align-items: center;
  gap: 24px;
}

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

.stat-num {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-main);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.stat-divider {
  width: 1px;
  height: 36px;
  background: var(--border-color);
}

/* Hero Card Preview */
.card-header-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-color);
  background: rgba(0, 0, 0, 0.2);
  border-top-left-radius: 16px;
  border-top-right-radius: 16px;
}

.window-dots {
  display: flex;
  gap: 6px;
}

.window-dots .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.window-dots .red { background: #ef4444; }
.window-dots .yellow { background: #f59e0b; }
.window-dots .green { background: #10b981; }

.card-title-text {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.card-body-preview {
  padding: 24px;
}

.score-main-display {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.score-ring-container {
  position: relative;
  width: 100px;
  height: 100px;
}

.score-ring-svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.ring-bg {
  fill: none;
  stroke: rgba(255, 255, 255, 0.1);
  stroke-width: 8;
}

.ring-progress {
  fill: none;
  stroke: var(--primary-emerald);
  stroke-width: 8;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.8s ease;
}

.ring-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

.score-val {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
}

.score-max {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.grade-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.badge-green {
  background: rgba(16, 185, 129, 0.15);
  color: var(--primary-emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.mini-breakdown-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mini-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
}

.mini-name {
  color: var(--text-muted);
  width: 50%;
}

.mini-bar-bg {
  flex: 1;
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 3px;
  margin: 0 12px;
  overflow: hidden;
}

.mini-bar-fill {
  height: 100%;
  background: var(--primary-emerald);
  border-radius: 3px;
}

.mini-val {
  font-weight: 600;
  color: var(--text-main);
}

/* Sections */
.section-padding {
  padding: 90px 0;
}

.section-header {
  margin-bottom: 48px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
}

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

/* Demo Interactive Calculator */
.demo-section {
  background: radial-gradient(circle at center, rgba(16, 185, 129, 0.05) 0%, transparent 70%);
}

.demo-calculator-card {
  padding: 36px;
}

.demo-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 36px;
}

.controls-title {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.controls-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.slider-group {
  margin-bottom: 20px;
}

.slider-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.weight-val {
  color: var(--primary-emerald);
}

.custom-slider {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.1);
  outline: none;
  -webkit-appearance: none;
}

.custom-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary-emerald);
  cursor: pointer;
  box-shadow: 0 0 10px var(--primary-emerald);
  transition: transform 0.1s;
}

.custom-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.demo-output {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 12px;
  padding: 24px;
  border: 1px solid var(--border-color);
}

.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.location-tag {
  font-size: 0.85rem;
  color: var(--accent-cyan);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.calc-score-badge {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-emerald);
}

.formula-box {
  background: rgba(11, 15, 23, 0.8);
  border: 1px solid var(--border-color);
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 20px;
}

.formula-title {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
}

.formula-box code {
  font-family: monospace;
  font-size: 0.85rem;
  color: var(--primary-emerald);
  word-break: break-all;
}

.transparent-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.transparent-table th, .transparent-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.transparent-table th {
  color: var(--text-dim);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.75rem;
}

/* Feature Grid */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.feature-card {
  padding: 32px;
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.icon-emerald { background: rgba(16, 185, 129, 0.15); color: var(--primary-emerald); }
.icon-amber { background: rgba(245, 158, 11, 0.15); color: var(--accent-amber); }
.icon-cyan { background: rgba(6, 182, 212, 0.15); color: var(--accent-cyan); }
.icon-purple { background: rgba(139, 92, 246, 0.15); color: var(--accent-purple); }

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 10px;
}

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

/* CTA */
.cta-card {
  padding: 60px;
  text-align: center;
  background: radial-gradient(circle at center, rgba(16, 185, 129, 0.12) 0%, rgba(18, 26, 42, 0.8) 100%);
  border: 1px solid var(--border-glow);
}

.cta-title {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.cta-desc {
  color: var(--text-muted);
  font-size: 1.15rem;
  max-width: 600px;
  margin: 0 auto 32px auto;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
  margin-top: 60px;
  font-size: 0.9rem;
  color: var(--text-dim);
}

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

.footer-logo {
  height: 30px;
  margin-bottom: 8px;
}

@media (max-width: 900px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }

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

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

  .demo-grid {
    grid-template-columns: 1fr;
  }

  .footer-container {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }
}