:root {
  --primary: #007AFF;
  --secondary: #5856D6;
  --accent: #FF9500;
  --success: #34C759;
  --warning: #FFCC00;
  --error: #FF3B30;

  --bg: #FFFFFF;
  --bg-secondary: #F2F2F7;
  --label: #000000;
  --label-secondary: rgba(60, 60, 67, 0.7);
  --label-tertiary: rgba(60, 60, 67, 0.5);
  --separator: rgba(60, 60, 67, 0.18);

  --xs: 4px;
  --sm: 8px;
  --md: 16px;
  --lg: 24px;
  --xl: 32px;
  --xxl: 48px;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --content-width: 720px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04), 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary: #0A84FF;
    --secondary: #5E5CE6;
    --accent: #FF9F0A;
    --success: #30D158;
    --warning: #FFD60A;
    --error: #FF453A;

    --bg: #000000;
    --bg-secondary: #1C1C1E;
    --label: #FFFFFF;
    --label-secondary: rgba(235, 235, 245, 0.7);
    --label-tertiary: rgba(235, 235, 245, 0.5);
    --separator: rgba(84, 84, 88, 0.65);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4), 0 1px 3px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5), 0 2px 4px rgba(0, 0, 0, 0.4);
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--label);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: clamp(16px, 1rem + 0.1vw, 18px);
  line-height: 1.6;
  -webkit-tap-highlight-color: transparent;
}

a {
  color: var(--primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease, opacity 0.15s ease;
}

a:hover,
a:focus-visible {
  border-bottom-color: currentColor;
}

a:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: 2px;
}

main {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--lg) var(--md) var(--xxl);
}

.site-header {
  border-bottom: 1px solid var(--separator);
  background: var(--bg);
}

.site-header-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--md);
  display: flex;
  align-items: center;
  gap: var(--sm);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--sm);
  color: var(--label);
  font-weight: 600;
  font-size: 1.125rem;
  letter-spacing: -0.01em;
  border: none;
}

.brand:hover,
.brand:focus-visible {
  border: none;
  opacity: 0.85;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: block;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 var(--sm);
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--bg-secondary);
  color: var(--label-secondary);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(1.75rem, 1.4rem + 1.4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 var(--sm);
  line-height: 1.15;
}

h2 {
  font-size: clamp(1.25rem, 1.1rem + 0.6vw, 1.5rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: var(--xl) 0 var(--sm);
  line-height: 1.25;
}

h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin: var(--lg) 0 var(--xs);
}

p {
  margin: 0 0 var(--md);
  color: var(--label);
}

.lead {
  font-size: 1.0625rem;
  color: var(--label-secondary);
  margin-bottom: var(--lg);
}

ul,
ol {
  padding-left: 1.25em;
  margin: 0 0 var(--md);
}

li {
  margin-bottom: var(--xs);
}

li > strong {
  color: var(--label);
}

code,
.mono {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, monospace;
  font-size: 0.9em;
  background: var(--bg-secondary);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  color: var(--label);
}

.callout {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--md) var(--lg);
  margin: var(--lg) 0;
  border-left: 3px solid var(--primary);
}

.callout p:last-child {
  margin-bottom: 0;
}

.muted {
  color: var(--label-secondary);
  font-size: 0.9375rem;
}

.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  margin-right: var(--xs);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.tag-no {
  background: rgba(52, 199, 89, 0.12);
  color: var(--success);
}

.tag-yes {
  background: rgba(255, 149, 0, 0.14);
  color: var(--accent);
}

@media (prefers-color-scheme: dark) {
  .tag-no {
    background: rgba(48, 209, 88, 0.18);
  }
  .tag-yes {
    background: rgba(255, 159, 10, 0.2);
  }
}

.event-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--xs);
  margin: var(--md) 0 var(--lg);
}

.event-grid code {
  display: block;
  text-align: center;
  font-size: 0.8125rem;
  padding: var(--xs) var(--sm);
}

.faq details {
  border-bottom: 1px solid var(--separator);
  padding: var(--md) 0;
}

.faq details:last-of-type {
  border-bottom: none;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--md);
  color: var(--label);
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "+";
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--label-secondary);
  line-height: 1;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.faq details[open] summary::after {
  transform: rotate(45deg);
}

.faq details[open] summary {
  margin-bottom: var(--sm);
}

.contact-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--lg);
  margin: var(--lg) 0;
  display: flex;
  flex-direction: column;
  gap: var(--xs);
}

.contact-card .label {
  font-size: 0.8125rem;
  color: var(--label-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
}

.contact-card .email {
  font-size: 1.25rem;
  font-weight: 600;
}

.site-footer {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--lg) var(--md) var(--xl);
  border-top: 1px solid var(--separator);
  color: var(--label-secondary);
  font-size: 0.875rem;
  display: flex;
  flex-wrap: wrap;
  gap: var(--md);
  justify-content: space-between;
  align-items: center;
}

.site-footer nav {
  display: flex;
  gap: var(--md);
}

/* ==============================
   Landing (index.html)
   ============================== */

.hero {
  text-align: center;
  padding: var(--xxl) 0 var(--xl);
}

.hero-logo {
  width: 112px;
  height: 112px;
  border-radius: 24px;
  display: block;
  margin: 0 auto var(--lg);
  box-shadow: var(--shadow-md);
}

.hero h1 {
  font-size: clamp(2.5rem, 1.8rem + 2.5vw, 3.75rem);
  letter-spacing: -0.03em;
  margin-bottom: var(--sm);
  background: linear-gradient(135deg, var(--label), var(--primary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-tagline {
  font-size: clamp(1.0625rem, 1rem + 0.4vw, 1.25rem);
  color: var(--label-secondary);
  max-width: 520px;
  margin: 0 auto var(--lg);
  line-height: 1.5;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--md);
  justify-content: center;
  align-items: center;
  margin-bottom: var(--xl);
}

.app-store-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sm);
  background: var(--label);
  color: var(--bg);
  padding: 12px 22px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  border: none;
  transition: transform 0.15s ease, opacity 0.15s ease, box-shadow 0.15s ease;
  box-shadow: var(--shadow-sm);
}

.app-store-badge:hover,
.app-store-badge:focus-visible {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  border: none;
}

.app-store-badge .symbol {
  font-size: 1.4rem;
  line-height: 1;
}

.app-store-badge .label {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.1;
}

.app-store-badge .label small {
  font-size: 0.6875rem;
  font-weight: 500;
  opacity: 0.75;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.cta-secondary {
  color: var(--label-secondary);
  font-size: 0.9375rem;
  border: none;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--md);
  margin: var(--xl) 0;
}

.feature {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--lg);
  border: 1px solid var(--separator);
}

.feature-icon {
  display: inline-flex;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--primary);
  color: #fff;
  font-size: 1.25rem;
  margin-bottom: var(--sm);
}

.feature-icon.accent { background: var(--accent); }
.feature-icon.success { background: var(--success); }
.feature-icon.secondary { background: var(--secondary); }

.feature h3 {
  margin: 0 0 var(--xs);
  font-size: 1.0625rem;
}

.feature p {
  margin: 0;
  color: var(--label-secondary);
  font-size: 0.9375rem;
  line-height: 1.5;
}

.section {
  margin: var(--xxl) 0;
}

.section-title {
  text-align: center;
  margin: 0 0 var(--lg);
  font-size: clamp(1.5rem, 1.3rem + 0.7vw, 1.75rem);
}

.disclaimer {
  text-align: center;
  color: var(--label-tertiary);
  font-size: 0.8125rem;
  margin-top: var(--xl);
}

/* ==============================
   404
   ============================== */

.notfound {
  text-align: center;
  padding: var(--xxl) 0;
}

.notfound-code {
  font-size: clamp(4rem, 3rem + 5vw, 7rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--label-tertiary);
  line-height: 1;
  margin: 0 0 var(--md);
}

@media (max-width: 480px) {
  main {
    padding: var(--md) var(--md) var(--xl);
  }
  .site-header-inner {
    padding: var(--sm) var(--md);
  }
  h1 {
    margin-bottom: var(--xs);
  }
  .hero {
    padding: var(--xl) 0 var(--lg);
  }
  .hero-logo {
    width: 96px;
    height: 96px;
    border-radius: 20px;
  }
}