/* Design tokens — derived from app's iOS dark cyan accent + light surface aesthetic. */
:root {
  --color-bg: oklch(98.5% 0.005 240);
  --color-surface: oklch(100% 0 0);
  --color-surface-2: oklch(96% 0.008 240);
  --color-text: oklch(18% 0.02 240);
  --color-text-muted: oklch(45% 0.015 240);
  --color-border: oklch(90% 0.01 240);
  --color-accent: oklch(68% 0.15 210);          /* DR.Memory cyan */
  --color-accent-strong: oklch(58% 0.17 210);
  --color-accent-soft: oklch(95% 0.04 210);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;

  --shadow-sm: 0 1px 2px oklch(20% 0.02 240 / 0.06);
  --shadow-md: 0 8px 24px oklch(20% 0.02 240 / 0.08);
  --shadow-lg: 0 24px 60px oklch(20% 0.02 240 / 0.12);

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 6rem;
  --space-section: clamp(4rem, 3rem + 4vw, 8rem);

  --text-base: clamp(1rem, 0.95rem + 0.2vw, 1.0625rem);
  --text-lead: clamp(1.125rem, 1rem + 0.6vw, 1.375rem);
  --text-h2: clamp(1.75rem, 1.3rem + 1.6vw, 2.75rem);
  --text-hero: clamp(2.5rem, 1.6rem + 4vw, 4.75rem);

  --font-stack: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
                "Pretendard", "Hiragino Kaku Gothic ProN", "Noto Sans KR",
                "Noto Sans JP", system-ui, sans-serif;

  --duration-fast: 150ms;
  --duration-normal: 280ms;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: oklch(15% 0.01 240);
    --color-surface: oklch(19% 0.012 240);
    --color-surface-2: oklch(23% 0.014 240);
    --color-text: oklch(96% 0 0);
    --color-text-muted: oklch(72% 0.01 240);
    --color-border: oklch(28% 0.012 240);
    --color-accent: oklch(78% 0.16 210);
    --color-accent-strong: oklch(86% 0.14 200);
    --color-accent-soft: oklch(28% 0.07 210);
    --shadow-sm: 0 1px 2px oklch(0% 0 0 / 0.4);
    --shadow-md: 0 8px 24px oklch(0% 0 0 / 0.4);
    --shadow-lg: 0 24px 60px oklch(0% 0 0 / 0.5);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-stack);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent-strong); text-decoration: none; transition: color var(--duration-fast) var(--ease-out); }
a:hover { color: var(--color-accent); }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; border-radius: 4px; }

/* Layout primitives */
.container { width: min(1100px, 100% - 2.5rem); margin-inline: auto; }
.stack > * + * { margin-top: var(--space-2); }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  background: oklch(98% 0.005 240 / 0.7);
  border-bottom: 1px solid var(--color-border);
}
@media (prefers-color-scheme: dark) {
  .site-header { background: oklch(15% 0.01 240 / 0.65); }
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  padding-block: var(--space-2);
}
.brand {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-weight: 600; letter-spacing: -0.01em; color: var(--color-text);
}
.brand-mark {
  width: 32px; height: 32px; border-radius: 9px;
  background: conic-gradient(from 200deg, oklch(70% 0.14 210), oklch(75% 0.18 35),
              oklch(70% 0.18 290), oklch(70% 0.14 210));
  box-shadow: var(--shadow-sm);
}
.nav-locales {
  display: flex; gap: 0.4rem; font-size: 0.875rem;
}
.nav-locales a {
  padding: 0.35rem 0.7rem; border-radius: 999px;
  color: var(--color-text-muted);
}
.nav-locales a[aria-current="page"] {
  background: var(--color-accent-soft);
  color: var(--color-accent-strong);
}

/* Hero */
.hero {
  padding-block: var(--space-section);
  position: relative; overflow: hidden;
}
.hero-grid {
  display: grid; gap: var(--space-4);
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  align-items: center;
}
@media (max-width: 760px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
}
.eyebrow {
  display: inline-block; font-size: 0.78rem; font-weight: 600;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--color-accent-strong);
  background: var(--color-accent-soft);
  padding: 0.4rem 0.9rem; border-radius: 999px;
  margin-bottom: var(--space-2);
}
h1.hero-title {
  font-size: var(--text-hero); line-height: 1.05;
  letter-spacing: -0.025em; margin: 0 0 var(--space-2);
  font-weight: 700;
}
.hero-lead {
  font-size: var(--text-lead); color: var(--color-text-muted);
  max-width: 38ch; margin: 0 0 var(--space-3);
}
@media (max-width: 760px) { .hero-lead { margin-inline: auto; } }

.app-store-badge {
  display: inline-flex; align-items: center; gap: 0.6rem;
  padding: 0.85rem 1.4rem; border-radius: 14px;
  background: var(--color-text); color: var(--color-bg);
  font-weight: 600; font-size: 1rem;
  box-shadow: var(--shadow-md);
  transition: transform var(--duration-fast) var(--ease-out);
}
.app-store-badge:hover { transform: translateY(-2px); color: var(--color-bg); }
.app-store-badge svg { width: 22px; height: 22px; }

.hero-visual {
  position: relative; aspect-ratio: 9 / 16;
  max-height: 560px; margin-inline: auto;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, var(--color-accent-soft), var(--color-surface));
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  display: grid; place-items: center;
  font-size: 0.85rem; color: var(--color-text-muted);
}
.hero-visual img {
  width: 100%; height: 100%; object-fit: cover; object-position: top center;
}

/* Sections */
section { padding-block: var(--space-section); }
section h2 {
  font-size: var(--text-h2); letter-spacing: -0.02em; line-height: 1.15;
  margin: 0 0 var(--space-3); font-weight: 700;
}

/* Feature grid */
.features {
  display: grid; gap: var(--space-3);
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  transition: transform var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.feature-card .feature-icon {
  width: 44px; height: 44px; border-radius: 12px;
  display: grid; place-items: center;
  background: var(--color-accent-soft);
  color: var(--color-accent-strong);
  margin-bottom: var(--space-2);
  font-size: 1.4rem;
}
.feature-card h3 {
  font-size: 1.125rem; margin: 0 0 0.5rem;
  letter-spacing: -0.01em;
}
.feature-card p {
  margin: 0; color: var(--color-text-muted); font-size: 0.95rem;
}

/* Privacy stance callout */
.privacy-callout {
  background: linear-gradient(135deg, var(--color-accent-soft), var(--color-surface-2));
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  text-align: center;
}
.privacy-callout h2 { margin-bottom: var(--space-2); }
.privacy-callout p {
  font-size: var(--text-lead); color: var(--color-text);
  max-width: 50ch; margin-inline: auto;
}

/* Long-form pages (privacy, terms) */
.legal {
  padding-block: var(--space-section);
}
.legal-content {
  max-width: 720px; margin-inline: auto;
}
.legal-content h1 {
  font-size: clamp(2rem, 1.4rem + 1.6vw, 2.75rem);
  letter-spacing: -0.02em; line-height: 1.15; margin: 0 0 var(--space-2);
}
.legal-content .last-updated {
  color: var(--color-text-muted); font-size: 0.92rem;
  margin: 0 0 var(--space-4);
}
.legal-content h2 {
  font-size: 1.4rem; margin-top: var(--space-4); margin-bottom: var(--space-2);
  letter-spacing: -0.01em;
}
.legal-content h3 { font-size: 1.1rem; margin-top: var(--space-3); margin-bottom: 0.5rem; }
.legal-content p, .legal-content li { line-height: 1.7; }
.legal-content ul, .legal-content ol { padding-left: 1.4rem; }
.legal-content .meta-table {
  border-collapse: collapse; width: 100%; margin-block: var(--space-2);
  background: var(--color-surface); border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--color-border);
}
.legal-content .meta-table th, .legal-content .meta-table td {
  padding: 0.7rem 1rem; text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.95rem; vertical-align: top;
}
.legal-content .meta-table th {
  background: var(--color-surface-2); width: 32%; font-weight: 600;
}
.legal-content .meta-table tr:last-child th,
.legal-content .meta-table tr:last-child td { border-bottom: none; }

/* Footer */
.site-footer {
  margin-top: var(--space-section);
  padding-block: var(--space-4);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-2);
}
.site-footer .container {
  display: flex; flex-wrap: wrap; gap: var(--space-3);
  justify-content: space-between; align-items: flex-start;
  font-size: 0.9rem; color: var(--color-text-muted);
}
.site-footer nav ul {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-wrap: wrap; gap: 1.2rem;
}
.site-footer nav a { color: var(--color-text-muted); }
.site-footer nav a:hover { color: var(--color-accent); }
.business-info {
  font-size: 0.82rem; line-height: 1.7; margin: 0;
}
.business-info strong { color: var(--color-text); font-weight: 600; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}