/* ============================================================
   Breath Launcher — Shared Stylesheet
   Design System: Ocean Night Theme
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* --- CSS Custom Properties --- */
:root {
  /* Color palette */
  --bg-primary:     #07101F;
  --bg-surface:     #0E1D32;
  --bg-elevated:    #152641;
  --bg-card:        #0E1D32;
  --bg-card-hover:  #152641;

  --text-primary:   #F0F4FF;
  --text-secondary: #6B82A0;
  --text-muted:     #3D5470;

  --accent:         #4E94FF;
  --accent-dim:     #2760C2;
  --accent-glow:    rgba(78, 148, 255, 0.18);
  --accent-glow-lg: rgba(78, 148, 255, 0.10);

  --teal:           #27C99A;
  --teal-glow:      rgba(39, 201, 154, 0.15);

  --divider:        #18304D;

  /* Spacing scale (8px base) */
  --space-xs:   4px;
  --space-sm:   8px;
  --space-md:   16px;
  --space-lg:   24px;
  --space-xl:   32px;
  --space-xxl:  48px;
  --space-3xl:  72px;
  --space-4xl:  96px;

  /* Typography */
  --font-sans:    'Inter', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.75rem;
  --font-size-5xl: 3.75rem;
  --font-size-6xl: 5rem;

  /* Radii */
  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  16px;
  --radius-xl:  24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md:  0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg:  0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(78, 148, 255, 0.12);

  /* Transitions */
  --transition-fast:   150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow:   400ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --max-width:        1200px;
  --max-width-narrow: 760px;
  --nav-height:       80px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-md);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

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

ul {
  list-style: none;
}

/* --- Typography Scale --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

h1 { font-size: clamp(2.5rem, 6vw, var(--font-size-6xl)); font-weight: 800; }
h2 { font-size: clamp(1.75rem, 4vw, var(--font-size-4xl)); }
h3 { font-size: clamp(1.25rem, 2.5vw, var(--font-size-2xl)); }
h4 { font-size: var(--font-size-xl); font-weight: 600; }

p {
  color: var(--text-secondary);
  line-height: 1.75;
}

/* --- Layout Utilities --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.container--narrow {
  max-width: var(--max-width-narrow);
}

.section {
  padding: var(--space-4xl) 0;
}

.section--lg {
  padding: 120px 0;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 100;
  transition: background-color var(--transition-normal), backdrop-filter var(--transition-normal), border-color var(--transition-normal);
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background-color: rgba(7, 16, 31, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom-color: var(--divider);
}

.nav > .container {
  height: 100%;
}

.nav__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
}

.nav__wordmark {
  font-size: var(--font-size-xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.nav__link:hover {
  color: var(--text-primary);
}

.nav__cta {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-primary);
  background: var(--accent);
  padding: 8px 20px;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.nav__cta:hover {
  background: #6BA8FF;
  color: var(--text-primary);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(78, 148, 255, 0.35);
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--space-sm);
  background: none;
  border: none;
  outline: none;
}

.nav__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
  transform-origin: center;
}

.nav__hamburger.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav__hamburger.is-open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav__hamburger.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu */
.nav__mobile-menu {
  display: none;
  flex-direction: column;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background-color: rgba(7, 16, 31, 0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--divider);
  padding: var(--space-lg) var(--space-xl);
  gap: var(--space-md);
  z-index: 99;
  transform: translateY(-10px);
  opacity: 0;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
  pointer-events: none;
}

.nav__mobile-menu.is-open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: all;
}

.nav__mobile-menu .nav__link {
  font-size: var(--font-size-lg);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--divider);
}

.nav__mobile-menu .nav__cta {
  margin-top: var(--space-sm);
  text-align: center;
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-md);
}

/* --- Breathing Ring Logo --- */
.breath-logo {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.breath-logo__rings {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.breath-logo__ring {
  position: absolute;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--accent);
}

.breath-logo__dot {
  border-radius: var(--radius-full);
  background-color: var(--accent);
  position: relative;
  z-index: 1;
}

/* Nav logo — small */
.breath-logo--sm .breath-logo__rings {
  width: 28px;
  height: 28px;
}
.breath-logo--sm .breath-logo__ring:nth-child(1) { width: 28px; height: 28px; opacity: 0.25; }
.breath-logo--sm .breath-logo__ring:nth-child(2) { width: 20px; height: 20px; opacity: 0.5; }
.breath-logo--sm .breath-logo__ring:nth-child(3) { width: 12px; height: 12px; opacity: 0.85; }
.breath-logo--sm .breath-logo__dot { width: 4px; height: 4px; }

/* Hero logo — large */
.breath-logo--hero .breath-logo__rings {
  width: 120px;
  height: 120px;
  animation: breathe 4s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}
.breath-logo--hero .breath-logo__ring:nth-child(1) { width: 120px; height: 120px; opacity: 0.15; }
.breath-logo--hero .breath-logo__ring:nth-child(2) { width: 86px; height: 86px; opacity: 0.35; }
.breath-logo--hero .breath-logo__ring:nth-child(3) { width: 52px; height: 52px; opacity: 0.70; }
.breath-logo--hero .breath-logo__dot { width: 14px; height: 14px; }

/* Medium logo — for cards etc */
.breath-logo--md .breath-logo__rings {
  width: 56px;
  height: 56px;
}
.breath-logo--md .breath-logo__ring:nth-child(1) { width: 56px; height: 56px; opacity: 0.15; }
.breath-logo--md .breath-logo__ring:nth-child(2) { width: 40px; height: 40px; opacity: 0.35; }
.breath-logo--md .breath-logo__ring:nth-child(3) { width: 24px; height: 24px; opacity: 0.70; }
.breath-logo--md .breath-logo__dot { width: 6px; height: 6px; }

@keyframes breathe {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.08); }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-family: var(--font-sans);
  font-weight: 600;
  cursor: pointer;
  border: none;
  outline: none;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-md);
  box-shadow: 0 2px 16px rgba(78, 148, 255, 0.25);
}

.btn--primary:hover {
  background: #6BA8FF;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(78, 148, 255, 0.4);
}

.btn--primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 10px rgba(78, 148, 255, 0.2);
}

.btn--outline {
  background: transparent;
  color: var(--text-secondary);
  padding: 13px 28px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-md);
  border: 1.5px solid var(--divider);
}

.btn--outline:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
  background: var(--bg-elevated);
}

.btn--lg {
  padding: 16px 36px;
  font-size: var(--font-size-lg);
}

/* Google Play badge button */
.btn--play {
  background: var(--bg-elevated);
  color: var(--text-primary);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: var(--font-size-md);
  border: 1px solid var(--divider);
  gap: 12px;
  min-width: 200px;
}

.btn--play:hover {
  background: #1D3555;
  color: var(--text-primary);
  border-color: var(--accent-dim);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--play .play-label-small {
  font-size: var(--font-size-xs);
  font-weight: 400;
  opacity: 0.7;
  display: block;
  line-height: 1;
}

.btn--play .play-label-large {
  font-size: var(--font-size-md);
  font-weight: 700;
  display: block;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

/* --- Cards --- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--divider);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-normal);
}

.card--interactive {
  cursor: default;
}

.card--interactive:hover {
  background: var(--bg-card-hover);
  border-color: rgba(78, 148, 255, 0.25);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md), 0 0 0 1px rgba(78, 148, 255, 0.1);
}

/* --- Badges / Tags --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: var(--radius-full);
}

.badge--accent {
  background: var(--accent-glow);
  color: var(--accent);
  border: 1px solid rgba(78, 148, 255, 0.2);
}

.badge--teal {
  background: var(--teal-glow);
  color: var(--teal);
  border: 1px solid rgba(39, 201, 154, 0.2);
}

/* --- Section Header --- */
.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-header__eyebrow {
  font-size: var(--font-size-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-md);
}

.section-header__title {
  margin-bottom: var(--space-md);
}

.section-header__subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

/* --- Dividers --- */
.divider {
  height: 1px;
  background: var(--divider);
  border: none;
  margin: 0;
}

/* --- Scroll Fade-in Animation --- */
.fade-in-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in-up.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-up--delay-1 { transition-delay: 80ms; }
.fade-in-up--delay-2 { transition-delay: 160ms; }
.fade-in-up--delay-3 { transition-delay: 240ms; }
.fade-in-up--delay-4 { transition-delay: 320ms; }
.fade-in-up--delay-5 { transition-delay: 400ms; }
.fade-in-up--delay-6 { transition-delay: 480ms; }
.fade-in-up--delay-7 { transition-delay: 560ms; }
.fade-in-up--delay-8 { transition-delay: 640ms; }

/* --- Footer --- */
.footer {
  padding: var(--space-3xl) 0 var(--space-xxl);
  border-top: 1px solid var(--divider);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  text-align: center;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
}

.footer__wordmark {
  font-size: var(--font-size-xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-secondary);
}

.footer__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
  justify-content: center;
}

.footer__link {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--text-secondary);
}

.footer__caption {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

/* --- Policy / Terms Page Layout --- */
.policy-page {
  padding-top: calc(var(--nav-height) + var(--space-4xl));
  padding-bottom: var(--space-4xl);
}

.policy-header {
  margin-bottom: var(--space-3xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--divider);
}

.policy-header__eyebrow {
  font-size: var(--font-size-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-md);
}

.policy-header__title {
  margin-bottom: var(--space-md);
}

.policy-header__meta {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.policy-content {
  color: var(--text-secondary);
}

.policy-content h2 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-top: var(--space-3xl);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--divider);
}

.policy-content h2:first-of-type {
  margin-top: 0;
}

.policy-content h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

.policy-content p {
  margin-bottom: var(--space-md);
  line-height: 1.8;
}

.policy-content ul {
  list-style: none;
  margin-bottom: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.policy-content ul li {
  padding-left: var(--space-lg);
  position: relative;
  line-height: 1.7;
}

.policy-content ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 11px;
  width: 5px;
  height: 5px;
  border-radius: var(--radius-full);
  background: var(--accent);
  opacity: 0.6;
}

.policy-content strong {
  color: var(--text-primary);
  font-weight: 600;
}

.policy-content a {
  color: var(--accent);
}

.policy-content a:hover {
  color: var(--text-primary);
}

.policy-highlight {
  background: var(--bg-elevated);
  border: 1px solid var(--divider);
  border-left: 3px solid var(--teal);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.policy-highlight p {
  margin: 0;
  color: var(--text-secondary);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-lg);
  }

  .section {
    padding: var(--space-3xl) 0;
  }

  .section--lg {
    padding: var(--space-4xl) 0;
  }

  .nav__links {
    display: none;
  }

  .nav__hamburger {
    display: flex;
  }

  .nav__mobile-menu {
    display: flex;
  }

  .footer__links {
    gap: var(--space-lg);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }
}

/* --- Noise texture overlay (subtle depth) --- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-size: 200px 200px;
}