:root {
  --blue: #4992F7;
  --blue-glow: rgba(0, 122, 255, 0.15);
  --blue-bg: rgba(0, 122, 255, 0.06);
  --white: #ffffff;
  --gray-50: #f9f9fb;
  --gray-100: #f2f2f7;
  --gray-200: #e5e5ea;
  --gray-300: #c7c7cc;
  --gray-400: #aeaeb2;
  --gray-500: #8e8e93;
  --gray-700: #3a3a3c;
  --gray-900: #1c1c1e;
  --text: #1c1c1e;
  --text2: #3a3a3c;
  --text3: #8e8e93;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 48px rgba(0,0,0,0.10);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--white);
  color: var(--text);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 max(24px, 5vw);
  background: rgba(255,255,255,0.88);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--gray-200);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.nav-logo-icon {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0,122,255,0.3);
  flex-shrink: 0;
}

.nav-logo-icon svg { width: 17px; height: 17px; fill: white; }

.nav-logo-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.nav-brand {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text3);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
  cursor: pointer;
}
.nav-links a:hover { color: var(--blue); }

.hero {
  padding-top: 130px;
  padding-bottom: 80px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-left: max(24px, 5vw);
  padding-right: max(24px, 5vw);
}

.app-icon-wrapper {
  position: relative;
  margin-bottom: 28px;
}

.app-icon-wrapper::before {
  content: '';
  position: absolute;
  inset: -24px;
  border-radius: 40%;
  background: radial-gradient(ellipse at center, rgba(0,122,255,0.10) 0%, transparent 68%);
  pointer-events: none;
}

.app-icon {
  width: 120px;
  height: 120px;
  border-radius: 26.9px;
  overflow: hidden;
  position: relative;
  box-shadow:
    0 4px 12px rgba(0,0,0,0.10),
    0 16px 48px rgba(0,122,255,0.20),
    0 0 0 0.5px rgba(0,0,0,0.05);
  background: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.35s cubic-bezier(.34,1.56,.64,1), box-shadow 0.3s;
}

.app-icon:hover {
  transform: scale(1.06) translateY(-5px);
  box-shadow:
    0 10px 28px rgba(0,0,0,0.12),
    0 28px 64px rgba(0,122,255,0.28),
    0 0 0 0.5px rgba(0,0,0,0.05);
}

.app-icon svg {
  width: 62px;
  height: 62px;
  fill: white;
}

.app-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.app-icon::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 48%;
  background: linear-gradient(180deg, rgba(255,255,255,0.16) 0%, rgba(255,255,255,0) 100%);
  border-radius: 26.9px 26.9px 0 0;
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--blue-bg);
  border: 1px solid rgba(0,122,255,0.14);
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 100px;
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}

.hero-badge span {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--blue);
  display: inline-block;
}

.hero h1 {
  font-size: clamp(2.6rem, 7vw, 3.8rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.05;
  color: var(--text);
  margin-bottom: 14px;
}

.hero p {
  font-size: clamp(1rem, 2.5vw, 1.15rem);
  color: var(--text3);
  font-weight: 400;
  max-width: 400px;
  line-height: 1.65;
  margin-bottom: 36px;
}

.btn-appstore {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--gray-900);
  color: white;
  text-decoration: none;
  padding: 13px 26px;
  border-radius: 14px;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}
.btn-appstore:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.20);
  background: var(--gray-700);
}
.btn-appstore svg { width: 20px; height: 20px; fill: white; flex-shrink: 0; }
.btn-text { display: flex; flex-direction: column; align-items: flex-start; }
.btn-sub { font-size: 0.65rem; font-weight: 400; opacity: 0.7; line-height: 1; margin-bottom: 2px; }
.btn-main { font-size: 0.9rem; font-weight: 700; line-height: 1; }

.features {
  padding: 64px max(24px, 5vw) 80px;
  max-width: 960px;
  margin: 0 auto;
}

.section-label {
  text-align: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--blue);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}

.section-title {
  text-align: center;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 40px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
}

.feature-card {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 18px;
  padding: 26px 22px;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: rgba(0,122,255,0.18);
}

.feature-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  box-shadow: 0 4px 12px rgba(0,122,255,0.22);
}
.feature-icon svg { width: 22px; height: 22px; fill: white; }

.feature-card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}
.feature-card p {
  font-size: 0.855rem;
  color: var(--text3);
  line-height: 1.55;
}

footer {
  border-top: 1px solid var(--gray-200);
  padding: 28px max(24px, 5vw) 32px;
}

.footer-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  cursor: pointer;
}
.footer-logo-icon {
  width: 26px; height: 26px;
  border-radius: 7px;
  background: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
}
.footer-logo-icon svg { width: 15px; height: 15px; fill: white; }
.footer-logo span { font-size: 0.95rem; font-weight: 700; color: var(--text); }

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px 22px;
  list-style: none;
}
.footer-links a {
  text-decoration: none;
  color: var(--text3);
  font-size: 0.84rem;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--blue); }

.footer-copy { font-size: 0.78rem; color: var(--gray-400); }

.policy-page {
  display: none;
  padding: 90px max(24px, 5vw) 80px;
}
.policy-page.active { display: block; animation: fadeUp 0.3s ease forwards; }
.main-content.hidden { display: none; }

.policy-inner {
  max-width: 680px;
  margin: 0 auto;
}

.policy-back {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--blue);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  margin-bottom: 28px;
  transition: opacity 0.2s;
  border: none;
  background: none;
  padding: 0;
}
.policy-back:hover { opacity: 0.65; }
.policy-back svg { width: 16px; height: 16px; fill: none; stroke: var(--blue); stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; }

.policy-page h1 {
  font-size: clamp(1.8rem, 5vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 6px;
}
.policy-date { color: var(--text3); font-size: 0.875rem; margin-bottom: 36px; }
.policy-page h2 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin: 26px 0 8px;
}
.policy-page p {
  font-size: 0.93rem;
  color: var(--text2);
  line-height: 1.72;
  margin-bottom: 10px;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero { animation: fadeUp 0.4s ease forwards; }
.features { animation: fadeUp 0.5s 0.1s ease both; }

@media (max-width: 600px) {
  nav { padding: 0 20px; }
  .nav-links { display: none; }

  .hero { padding-top: 100px; }
  .app-icon { width: 100px; height: 100px; border-radius: 22.4px; }
  .app-icon svg { width: 52px; height: 52px; }

  .features { padding: 48px 20px 64px; }
  .features-grid { grid-template-columns: 1fr; }
  .policy-page { padding: 85px 20px 60px; }
}

@media (max-width: 600px) {
  .nav-policy-mobile {
    display: flex;
    gap: 14px;
  }
  .nav-policy-mobile a {
    color: var(--text3);
    text-decoration: none;
    font-size: 0.78rem;
    font-weight: 500;
  }
}
@media (min-width: 601px) {
  .nav-policy-mobile { display: none; }
}