:root {
  --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", system-ui, sans-serif;

  --bg-color: #ffffff;
  --bg-color-rgb: 255, 255, 255;
  --bg-secondary: #f8f9fa;
  --text-primary: #1a1a1a;
  --text-secondary: #5e5e5e;
  --accent-color: #007aff;
  --accent-hover: #0062cc;

  --border-color: #e5e5ea;
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.1);
  --shadow-device: 0 24px 48px rgba(0, 0, 0, 0.12);

  --star-color: #F5A623;
  --shield-color: #007AFF;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;

  --border-radius-sm: 8px;
  --border-radius-md: 16px;
  --border-radius-lg: 24px;

  --ease-emphasized: cubic-bezier(0.22, 1, 0.36, 1);
}

[data-theme="dark"] {
  --bg-color: #000000;
  --bg-color-rgb: 0, 0, 0;
  --bg-secondary: #121212;
  --text-primary: #f5f5f7;
  --text-secondary: #86868b;
  --accent-color: #0a84ff;
  --accent-hover: #409cff;
  --border-color: #333336;
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.4);
  --shadow-device: 0 24px 48px rgba(0, 0, 0, 0.5);

  --star-color: #FFD700;
  --shield-color: #0A84FF;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 17px;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-color);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: opacity 0.2s;
}

a:hover { opacity: 0.85; }

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

/* Typography scale */
h1, h2 {
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--text-primary);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

@media (min-width: 768px) {
  .container { padding: 0 var(--spacing-md); }
}

/* Sticky nav — glass */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(var(--bg-color-rgb), 0.72);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
  padding: 0.625rem 0;
}

.nav-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
}

.brand-wrapper {
  display: flex;
  align-items: center;
}

.brand {
  font-weight: 600;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

/* Theme toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  transition: background-color 0.2s ease;
}
.theme-toggle:hover,
.theme-toggle:focus-visible {
  background-color: var(--border-color);
  outline: none;
}
.theme-toggle svg { display: block; }

/* Lang selector — flags only */
.lang-selector {
  position: relative;
}
.lang-selector select {
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 0 0.5rem;
  height: 40px;
  min-width: 44px;
  border-radius: 8px;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  text-align: center;
  text-align-last: center;
}
.lang-selector select:hover,
.lang-selector select:focus-visible {
  background-color: var(--bg-secondary);
  outline: none;
}

/* Hero */
#hero-premium {
  padding: clamp(2.5rem, 6vw, 5rem) 0;
  overflow: hidden;
  position: relative;
}

.hero-grid {
  display: grid;
  gap: clamp(2rem, 5vw, 4rem);
}

.hero-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1rem;
}

.hero-text h1 {
  font-size: clamp(2.125rem, 5.5vw + 0.5rem, 3.75rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.025em;
}

.hero-text p {
  font-size: clamp(1.0625rem, 1.2vw + 0.6rem, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.5;
  max-width: 34rem;
}

.hero-text .cta-buttons {
  margin-top: 0.75rem;
}

/* Hero stage — static iPad behind + iPhone front */
.hero-stage {
  position: relative;
  min-height: 380px;
  display: flex;
  justify-content: center;
  align-items: center;
}

@media (min-width: 768px) {
  .hero-stage { min-height: 500px; }
}

@media (min-width: 1024px) {
  .hero-grid {
    grid-template-columns: 5fr 7fr;
    align-items: center;
  }
  .hero-stage { min-height: 600px; }
}

/* Device frames — motion composed via CSS vars */
.device-frame {
  --pos-x: 0px;
  --pos-y: 0px;
  --parallax: 0px;
  --rot-x: 0deg;
  --rot-y: 0deg;
  will-change: transform;
  transition: transform 220ms ease-out;
  transform: translate3d(var(--pos-x), calc(var(--pos-y) + var(--parallax)), 0)
             perspective(1200px)
             rotateY(var(--rot-y))
             rotateX(var(--rot-x));
}

.device-frame--iphone {
  width: 210px;
  border-radius: 32px;
  border: 8px solid #1c1c1e;
  background: #000000;
  box-shadow: var(--shadow-device);
  overflow: hidden;
  position: absolute;
  z-index: 2;
  top: 50%;
  left: 50%;
  aspect-ratio: 9 / 19.5;
  --pos-x: -50%;
  --pos-y: -50%;
}

.device-frame--iphone::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 22px;
  background-color: #000;
  border-bottom-left-radius: 14px;
  border-bottom-right-radius: 14px;
  z-index: 10;
}

.device-frame--iphone img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: #fff;
}

.device-frame--ipad {
  display: none;
  width: 380px;
  aspect-ratio: 4 / 3;
  border-radius: 20px;
  border: 10px solid #1c1c1e;
  background: #000000;
  box-shadow: var(--shadow-device);
  overflow: hidden;
  position: absolute;
  z-index: 1;
  top: 50%;
  left: 50%;
  --pos-x: -22%;
  --pos-y: -60%;
}

.device-frame--ipad img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: #fff;
}

@media (min-width: 768px) {
  .device-frame--iphone {
    width: 240px;
    --pos-x: -80%;
    --pos-y: -40%;
  }
  .device-frame--ipad { display: block; }
}

@media (min-width: 1024px) {
  .device-frame--iphone {
    width: 280px;
    --pos-x: -120%;
    --pos-y: -50%;
  }
  .device-frame--ipad {
    width: 640px;
    --pos-x: -22%;
    --pos-y: -55%;
  }
}

/* Trust strip */
#trust-strip {
  padding: var(--spacing-md) 0;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.trust-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
}

.trust-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9375rem;
}

/* Feature stories */
#feature-stories {
  padding-top: clamp(3rem, 8vw, 6rem);
  padding-bottom: clamp(3rem, 8vw, 6rem);
  display: grid;
  gap: clamp(3rem, 7vw, 6rem);
}

.feature-story {
  display: grid;
  gap: var(--spacing-md);
  align-items: center;
}

.feature-story__content h2 {
  font-size: clamp(1.5rem, 2.4vw + 0.5rem, 2.125rem);
  font-weight: 600;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.feature-story__content p {
  font-size: clamp(1rem, 0.8vw + 0.7rem, 1.125rem);
  color: var(--text-secondary);
  line-height: 1.5;
  max-width: 36rem;
}

.feature-story__media {
  display: flex;
  justify-content: center;
  position: relative;
}

.feature-story__media .device-frame--iphone {
  position: relative;
  top: auto;
  left: auto;
  width: 260px;
  --pos-x: 0;
  --pos-y: 0;
}

.feature-story__media .device-frame--ipad {
  position: relative;
  top: auto;
  left: auto;
  width: 100%;
  max-width: 900px;
  display: block;
  --pos-x: 0;
  --pos-y: 0;
}

@media (min-width: 1024px) {
  .feature-story {
    grid-template-columns: 4fr 8fr;
    gap: var(--spacing-xl);
  }
  .feature-story:nth-child(even) {
    grid-template-columns: 8fr 4fr;
  }
  .feature-story:nth-child(even) .feature-story__content { order: 2; }
  .feature-story:nth-child(even) .feature-story__media { order: 1; }
}

/* CTA buttons */
.cta-buttons {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  background-color: var(--accent-color);
  color: #fff;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  transition: background-color 0.2s, transform 0.2s;
}
.btn-primary:hover {
  background-color: var(--accent-hover);
  color: #fff;
  opacity: 1;
  transform: scale(1.02);
}
.btn-primary:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 3px;
}
.btn-primary .apple-logo { flex-shrink: 0; }

/* QR block */
.qr-download-container {
  display: none;
  background: transparent;
  text-align: center;
  align-items: center;
  flex-direction: column;
  gap: 0.5rem;
}
.qr-card {
  background: #fff;
  padding: 0.5rem;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(0, 0, 0, 0.05);
  display: inline-block;
}
.qr-card--large { padding: 1rem; border-radius: 16px; }
.qr-card img { border-radius: 4px; }
.qr-caption { color: var(--text-primary); display: inline-flex; }

/* Final CTA */
#cta-final {
  background-color: var(--bg-secondary);
  padding: clamp(3rem, 8vw, 6rem) 0;
  text-align: center;
}
#cta-final h2 {
  font-size: clamp(1.5rem, 3vw + 0.5rem, 2.25rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  max-width: 32rem;
  margin: 0 auto;
}
.cta-final-content {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
}

/* Footer */
footer {
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
}
.footer-tagline {
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  font-size: 0.9375rem;
  letter-spacing: -0.01em;
}

/* Motion — entry fade (opacity only, transform stays under CSS var control) */
.device-frame[data-motion="tilt"] {
  opacity: 0;
  transition: opacity 600ms ease-out, transform 220ms ease-out;
}
.device-frame[data-motion="tilt"].is-visible {
  opacity: 1;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .device-frame,
  .device-frame[data-motion="tilt"],
  .device-frame[data-motion="tilt"].is-visible {
    opacity: 1 !important;
    --parallax: 0px !important;
    --rot-x: 0deg !important;
    --rot-y: 0deg !important;
    transition: none !important;
  }
}