/* HanaNote Landing Page — Design System Tokens from DESIGN.md */

:root {
  --color-bg: #FFF8F1;
  --color-primary: #864E5A;
  --color-primary-container: #FFB7C5;
  --color-secondary: #745475;
  --color-secondary-container: #FCD3FB;
  --color-tertiary: #AC332A;
  --color-on-surface: #1E1B17;
  --color-on-surface-variant: #514345;
  --color-surface-low: #F9F3EB;
  --color-surface-lowest: #FFFBFF;
  --color-outline-variant: rgba(81, 67, 69, 0.15);
  --color-on-primary: #FFF8F1;
  --font-heading: 'Plus Jakarta Sans', system-ui, sans-serif;
  --font-body: 'Be Vietnam Pro', system-ui, sans-serif;
  --radius: 16px;
  --radius-full: 9999px;
  --shadow-ambient: 0 8px 24px rgba(134, 78, 90, 0.06);
}

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

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

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-on-surface);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Navigation ── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 248, 241, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-outline-variant);
}

.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-icon {
  border-radius: 8px;
}

.nav-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 18px;
  color: var(--color-primary);
  letter-spacing: -0.5px;
}

.nav-lang {
  display: flex;
  gap: 4px;
}

.lang-btn {
  background: transparent;
  border: 1px solid var(--color-outline-variant);
  border-radius: var(--radius-full);
  padding: 4px 12px;
  font-size: 12px;
  font-family: var(--font-body);
  color: var(--color-on-surface-variant);
  cursor: pointer;
  transition: all 0.2s;
}

.lang-btn:hover,
.lang-btn.active {
  background: var(--color-primary);
  color: var(--color-on-primary);
  border-color: var(--color-primary);
}

/* ── Hero ── */
.hero {
  padding: 140px 0 80px;
  text-align: center;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(40px, 8vw, 64px);
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -1.5px;
  margin-bottom: 12px;
}

.hero-tagline {
  font-size: clamp(18px, 3vw, 24px);
  color: var(--color-secondary);
  font-weight: 500;
  margin-bottom: 20px;
}

.hero-desc {
  max-width: 560px;
  margin: 0 auto 32px;
  color: var(--color-on-surface-variant);
  font-size: 15px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-version {
  margin-top: 16px;
  font-size: 13px;
  color: var(--color-on-surface-variant);
  opacity: 0.7;
}

/* ── Buttons ── */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius-full);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  transition: all 0.25s ease;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary-container), var(--color-secondary-container));
  color: var(--color-primary);
  border: none;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(134, 78, 90, 0.2);
}

.btn-secondary {
  background: var(--color-surface-lowest);
  color: var(--color-primary);
  border: 1px solid var(--color-outline-variant);
}

.btn-secondary:hover {
  background: var(--color-surface-low);
}

.btn-lg {
  padding: 16px 40px;
  font-size: 17px;
}

/* ── Features ── */
.features {
  padding: 80px 0;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 800;
  color: var(--color-primary);
  text-align: center;
  margin-bottom: 48px;
  letter-spacing: -0.5px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--color-surface-lowest);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform 0.2s;
  box-shadow: var(--shadow-ambient);
}

.feature-card:hover {
  transform: translateY(-4px);
}

.feature-emoji {
  font-size: 32px;
  margin-bottom: 14px;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-container);
  border-radius: 14px;
  opacity: 0.9;
}

.feature-card h3 {
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 700;
  color: var(--color-on-surface);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--color-on-surface-variant);
  line-height: 1.6;
}

/* ── Privacy ── */
.privacy {
  padding: 80px 0;
  background: var(--color-primary);
  color: var(--color-on-primary);
}

.section-title--light {
  color: var(--color-on-primary);
}

.privacy-grid {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.privacy-stat {
  text-align: center;
}

.privacy-number {
  font-family: var(--font-heading);
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 800;
  opacity: 0.95;
}

.privacy-label {
  font-size: 14px;
  opacity: 0.8;
  margin-top: 4px;
}

.privacy-desc {
  text-align: center;
  max-width: 480px;
  margin: 0 auto;
  font-size: 15px;
  opacity: 0.85;
  line-height: 1.7;
}

/* ── Download ── */
.download {
  padding: 80px 0;
  text-align: center;
}

.download-box {
  max-width: 400px;
  margin: 0 auto;
}

.download-meta {
  margin-top: 16px;
  font-size: 13px;
  color: var(--color-on-surface-variant);
}

.download-note {
  margin-top: 8px;
  font-size: 12px;
  color: var(--color-on-surface-variant);
  opacity: 0.6;
}

/* ── Footer ── */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--color-outline-variant);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

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

.footer-links a {
  font-size: 13px;
  color: var(--color-on-surface-variant);
  text-decoration: none;
  transition: color 0.2s;
}

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

.footer-copy {
  font-size: 12px;
  color: var(--color-on-surface-variant);
  opacity: 0.6;
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .hero { padding: 120px 0 60px; }
  .features, .privacy, .download { padding: 60px 0; }
  .privacy-grid { gap: 32px; }
  .features-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; text-align: center; }
  .hero-actions { flex-direction: column; align-items: center; }
}