:root {
  --bg-deep: #07090F;
  --bg-card: #0D1117;
  --surface-elevated: #131929;
  --surface-highlight: #1A2035;
  --card-stroke: #1E2A45;
  --divider: #1A2035;

  --primary-purple: #7C4DFF;
  --primary-purple-light: #B39DDB;
  --secondary-blue: #448AFF;
  --secondary-blue-light: #82B1FF;
  --glow-teal: #26C6DA;
  --mint-green: #69F0AE;
  --pro-gold: #FFD54F;

  --text-primary: #E8EAF6;
  --text-secondary: #90A4AE;
  --text-accent: #B39DDB;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  --shadow-glow: 0 0 40px rgba(124, 77, 255, 0.25);
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.5);
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-deep);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Ambient cosmic backdrop */
body::before {
  content: "";
  position: fixed;
  top: -20vh;
  left: 20%;
  width: 60vw;
  height: 60vh;
  background: radial-gradient(circle, rgba(124, 77, 255, 0.12) 0%, rgba(68, 138, 255, 0.05) 50%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  filter: blur(60px);
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* Header & Navigation */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(7, 9, 15, 0.75);
  border-bottom: 1px solid rgba(30, 42, 69, 0.6);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary-purple), var(--secondary-blue));
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(124, 77, 255, 0.4);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

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

.btn-nav-pro {
  background: linear-gradient(135deg, #7C4DFF, #448AFF);
  color: #FFFFFF;
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: transform 0.2s, box-shadow 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-nav-pro:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(124, 77, 255, 0.45);
}

/* Hero Section */
.hero {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 24px 60px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 48px;
  z-index: 1;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.time-greeting-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(124, 77, 255, 0.15);
  border: 1px solid rgba(179, 157, 219, 0.3);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  color: var(--primary-purple-light);
  font-size: 0.88rem;
  font-weight: 600;
  width: fit-content;
}

.hero-title {
  font-size: 3.4rem;
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(180deg, #FFFFFF 20%, #B39DDB 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 520px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 12px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-purple), var(--secondary-blue));
  color: #FFFFFF;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  font-size: 1rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 8px 24px rgba(124, 77, 255, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(124, 77, 255, 0.5);
}

.btn-secondary {
  background: var(--surface-elevated);
  border: 1px solid var(--card-stroke);
  color: var(--text-primary);
  padding: 14px 26px;
  border-radius: var(--radius-full);
  font-size: 1rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: background 0.2s, border-color 0.2s;
}

.btn-secondary:hover {
  background: var(--surface-highlight);
  border-color: var(--primary-purple-light);
}

/* Hero Live Simulator Box */
.hero-preview {
  position: relative;
  display: flex;
  justify-content: center;
}

.app-frame {
  width: 100%;
  max-width: 380px;
  background: linear-gradient(180deg, #0D1117 0%, #07090F 100%);
  border: 2px solid var(--card-stroke);
  border-radius: 36px;
  padding: 24px;
  box-shadow: var(--shadow-card), 0 0 50px rgba(124, 77, 255, 0.2);
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.app-frame::after {
  content: "";
  position: absolute;
  top: 12px;
  width: 90px;
  height: 4px;
  border-radius: 2px;
  background: var(--surface-highlight);
}

.hero-breathing-demo {
  margin-top: 24px;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.breathing-circle-wrapper {
  position: relative;
  width: 240px;
  height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 16px 0;
}

.breathing-circle {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: radial-gradient(circle, #7C4DFF 0%, #448AFF 100%);
  box-shadow: 0 0 60px rgba(124, 77, 255, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: transform 3s cubic-bezier(0.45, 0.05, 0.55, 0.95);
}

.breathing-circle-inner {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(4px);
}

.breathing-progress-ring {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.breathing-progress-ring circle {
  fill: none;
  stroke: #B39DDB;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-dasharray: 690;
  stroke-dashoffset: 690;
}

.phase-label {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.04em;
}

.cycle-counter {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* Section Common */
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 90px 24px;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--glow-teal);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

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

/* Activity Grid */
.activity-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.activity-card {
  background: var(--bg-card);
  border: 1px solid var(--card-stroke);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  cursor: pointer;
  overflow: hidden;
}

.activity-card:hover {
  transform: translateY(-4px);
  border-color: rgba(124, 77, 255, 0.4);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.6);
}

.activity-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.activity-icon-box {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
}

.badge {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.badge-free {
  background: rgba(105, 240, 174, 0.15);
  color: var(--mint-green);
  border: 1px solid rgba(105, 240, 174, 0.3);
}

.badge-pro {
  background: rgba(255, 213, 79, 0.15);
  color: var(--pro-gold);
  border: 1px solid rgba(255, 213, 79, 0.3);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.activity-title {
  font-size: 1.18rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.activity-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.45;
  margin-bottom: 18px;
  flex-grow: 1;
}

.activity-try-btn {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary-purple-light);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.2s;
}

.activity-card:hover .activity-try-btn {
  gap: 10px;
  color: #FFFFFF;
}

/* Interactive Simulator Modal / Section */
.interactive-section {
  background: linear-gradient(180deg, var(--bg-deep) 0%, var(--surface-elevated) 50%, var(--bg-deep) 100%);
  border-top: 1px solid var(--divider);
  border-bottom: 1px solid var(--divider);
  padding: 90px 24px;
}

.sim-container {
  max-width: 960px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--card-stroke);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.sim-tabs-header {
  display: flex;
  overflow-x: auto;
  background: var(--surface-elevated);
  border-bottom: 1px solid var(--card-stroke);
  padding: 8px;
  gap: 6px;
  scrollbar-width: thin;
}

.sim-tab-btn {
  padding: 10px 18px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: background 0.2s, color 0.2s;
}

.sim-tab-btn.active {
  background: var(--surface-highlight);
  color: var(--text-primary);
}

.sim-tab-btn:hover:not(.active) {
  color: var(--text-primary);
}

.sim-viewport {
  position: relative;
  width: 100%;
  height: 480px;
  background: var(--bg-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  user-select: none;
}

.sim-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.sim-overlay-controls {
  position: absolute;
  top: 18px;
  left: 20px;
  right: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  pointer-events: none;
}

.sim-overlay-controls > * {
  pointer-events: auto;
}

.sim-status-pill {
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid var(--card-stroke);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  color: var(--text-primary);
}

.sim-action-btn {
  background: rgba(124, 77, 255, 0.2);
  border: 1px solid rgba(179, 157, 219, 0.35);
  color: var(--text-primary);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  transition: background 0.2s;
}

.sim-action-btn:hover {
  background: rgba(124, 77, 255, 0.4);
}

.sim-hint {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(7, 9, 15, 0.8);
  backdrop-filter: blur(8px);
  border: 1px solid var(--card-stroke);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  color: var(--text-secondary);
  pointer-events: none;
}

/* Settings Logic Section */
.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.settings-card {
  background: var(--bg-card);
  border: 1px solid var(--card-stroke);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.settings-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.settings-card-title {
  font-size: 1.15rem;
  font-weight: 700;
}

.settings-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Switch toggle */
.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 28px;
  flex-shrink: 0;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: var(--surface-highlight);
  border: 1px solid var(--card-stroke);
  transition: 0.3s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 3px;
  bottom: 3px;
  background-color: var(--text-secondary);
  transition: 0.3s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--primary-purple);
  border-color: var(--primary-purple-light);
}

input:checked + .slider:before {
  transform: translateX(22px);
  background-color: #FFFFFF;
}

/* Timer Chip Group */
.chip-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.chip-btn {
  background: var(--surface-highlight);
  border: 1px solid var(--card-stroke);
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  transition: all 0.2s;
}

.chip-btn.active {
  background: var(--primary-purple);
  color: #FFFFFF;
  border-color: var(--primary-purple-light);
}

/* SleepFlow Pro Pricing Section */
.pro-section {
  position: relative;
  padding: 100px 24px;
  background: radial-gradient(circle at 50% 30%, rgba(124, 77, 255, 0.1) 0%, transparent 70%);
}

.pro-emblem-wrapper {
  width: 64px;
  height: 64px;
  border-radius: 20px;
  background: linear-gradient(135deg, rgba(255, 213, 79, 0.2), rgba(124, 77, 255, 0.2));
  border: 1px solid rgba(255, 213, 79, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  box-shadow: 0 0 30px rgba(255, 213, 79, 0.2);
}

.pro-features-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 540px;
  margin: 0 auto 40px;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.pro-features-list li {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.pro-features-list li span {
  color: var(--pro-gold);
}

.pricing-cards-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
}

.plan-card {
  background: var(--bg-card);
  border: 1px solid var(--card-stroke);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: transform 0.25s, border-color 0.25s;
  cursor: pointer;
}

.plan-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary-purple-light);
}

.plan-card.featured {
  border: 2px solid var(--primary-purple);
  box-shadow: 0 10px 40px rgba(124, 77, 255, 0.35);
  background: linear-gradient(180deg, #131929 0%, #0D1117 100%);
}

.plan-badge-popular {
  position: absolute;
  top: -12px;
  background: linear-gradient(135deg, var(--pro-gold), #FF8A65);
  color: #07090F;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  padding: 4px 14px;
  border-radius: var(--radius-full);
}

.plan-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.plan-price {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.plan-card.featured .plan-price {
  color: var(--pro-gold);
}

.plan-period {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.plan-card.featured .plan-period {
  color: var(--primary-purple-light);
}

.btn-plan {
  width: 100%;
  padding: 12px;
  border-radius: var(--radius-full);
  font-size: 0.92rem;
  font-weight: 600;
  background: var(--surface-highlight);
  border: 1px solid var(--card-stroke);
  color: var(--text-primary);
  transition: all 0.2s;
}

.plan-card.featured .btn-plan {
  background: linear-gradient(135deg, var(--primary-purple), var(--secondary-blue));
  border: none;
  color: #FFFFFF;
  box-shadow: 0 4px 16px rgba(124, 77, 255, 0.4);
}

.btn-plan:hover {
  transform: translateY(-1px);
}

/* Footer */
.footer {
  border-top: 1px solid var(--divider);
  padding: 48px 24px;
  background: #04060A;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-copy {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

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

.footer-links a {
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--text-primary);
}

/* Privacy Policy Page Specific Styles */
.policy-page {
  max-width: 820px;
  margin: 0 auto;
  padding: 60px 24px 100px;
}

.policy-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 32px;
  transition: color 0.2s;
}

.policy-back-btn:hover {
  color: var(--text-primary);
}

.policy-card {
  background: var(--bg-card);
  border: 1px solid var(--card-stroke);
  border-radius: var(--radius-lg);
  padding: 44px;
  box-shadow: var(--shadow-card);
}

.policy-title {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.policy-updated {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--divider);
}

.policy-section {
  margin-bottom: 32px;
}

.policy-section h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.policy-section p, .policy-section li {
  font-size: 0.95rem;
  color: #B0BEC5;
  line-height: 1.7;
  margin-bottom: 10px;
}

.policy-section ul {
  padding-left: 24px;
  margin-bottom: 12px;
}

.policy-highlight-box {
  background: rgba(124, 77, 255, 0.08);
  border-left: 3px solid var(--primary-purple);
  padding: 16px 20px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 16px 0;
}

/* Responsive adjustments */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
    padding-top: 50px;
  }

  .hero-content {
    align-items: center;
  }

  .hero-title {
    font-size: 2.6rem;
  }

  .pricing-cards-row {
    grid-template-columns: 1fr;
    max-width: 360px;
  }
}

@media (max-width: 600px) {
  .hero-title {
    font-size: 2.1rem;
  }

  .nav-links {
    display: none;
  }

  .sim-viewport {
    height: 380px;
  }

  .policy-card {
    padding: 24px;
  }
}