:root{
  --bg-start: #dff4ff;
  --bg-end: #eadcff;
  --surface: rgba(255,255,255,0.82);
  --surface-strong: rgba(255,255,255,0.92);
  --card-border: rgba(255,255,255,0.75);
  --text-main: #22252f;
  --text-sub: #667085;
  --primary: #6c63ff;
  --primary-2: #4f8df7;
  --primary-soft: #f1efff;
  --danger: #ff6b6b;
  --warning: #ffb347;
  --success: #42c79a;
  --shadow-sm: 0 8px 20px rgba(43, 53, 88, 0.08);
  --shadow-md: 0 14px 35px rgba(43, 53, 88, 0.12);
  --radius-xl: 30px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 14px;
  --nav-height: 86px;
}

*{
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html{
  height: 100%;
}

body{
  margin: 0;
  min-height: 100%;
  font-family: "Segoe UI", "Hiragino Sans", "Yu Gothic UI", sans-serif;
  color: var(--text-main);
  background:
    radial-gradient(circle at top left, rgba(255,255,255,0.6), transparent 35%),
    linear-gradient(180deg, var(--bg-start), var(--bg-end));
}

button,
input,
select,
textarea{
  font: inherit;
}

button{
  border: none;
  background: none;
  cursor: pointer;
}

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

.app-shell{
  width: 100%;
  max-width: 520px;
  min-height: 100vh;
  margin: 0 auto;
  position: relative;
  padding-bottom: calc(var(--nav-height) + env(safe-area-inset-bottom) + 14px);
  background:
    radial-gradient(circle at top right, rgba(255,255,255,0.45), transparent 30%),
    linear-gradient(180deg, var(--bg-start), var(--bg-end));
}

.topbar{
  padding: 18px 18px 10px;
  position: sticky;
  top: 0;
  z-index: 20;
  background: linear-gradient(
    180deg,
    rgba(223,244,255,0.9) 0%,
    rgba(223,244,255,0.72) 60%,
    rgba(223,244,255,0) 100%
  );
  backdrop-filter: blur(10px);
}

.brand{
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 24px;
  background: rgba(255,255,255,0.72);
  border: 1px solid rgba(255,255,255,0.86);
  box-shadow: var(--shadow-sm);
}

.brand-logo{
  width: 52px;
  height: 52px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  font-size: 24px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  box-shadow: 0 10px 18px rgba(108, 99, 255, 0.28);
  flex-shrink: 0;
}

.brand h1{
  margin: 0;
  font-size: 22px;
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.brand p{
  margin: 4px 0 0;
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.4;
}

.main-content{
  padding: 8px 18px 22px;
}

.screen{
  display: none;
  animation: fadeIn 0.22s ease;
}

.screen.active{
  display: block;
}

@keyframes fadeIn{
  from{
    opacity: 0;
    transform: translateY(4px);
  }
  to{
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-card{
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-xl);
  padding: 24px 20px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary-2), var(--primary));
  box-shadow: var(--shadow-md);
}

.hero-card::after{
  content: "";
  position: absolute;
  width: 180px;
  height: 180px;
  right: -50px;
  top: -40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.12);
}

.hero-badge{
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 28px;
  padding: 6px 12px;
  margin-bottom: 14px;
  border-radius: 999px;
  background: rgba(255,255,255,0.16);
  border: 1px solid rgba(255,255,255,0.16);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.hero-card h2{
  margin: 0 0 10px;
  font-size: 28px;
  line-height: 1.25;
  font-weight: 800;
  max-width: 280px;
  position: relative;
  z-index: 1;
}

.hero-card p{
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255,255,255,0.94);
  position: relative;
  z-index: 1;
}

.card-list{
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.feature-wide-card{
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  text-align: left;
  padding: 20px 18px;
  border-radius: 24px;
  background: var(--surface);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(12px);
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.feature-wide-card:active{
  transform: scale(0.985);
}

.feature-wide-card:hover{
  box-shadow: var(--shadow-md);
  background: var(--surface-strong);
}

.feature-wide-card .emoji{
  width: 50px;
  height: 50px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  font-size: 24px;
  border-radius: 18px;
  background: linear-gradient(135deg, #f5f3ff, #e7f0ff);
}

.feature-wide-card .label{
  font-size: 20px;
  line-height: 1.35;
  font-weight: 800;
  color: #2c3140;
}

.section-title{
  margin: 6px 0 16px;
  font-size: 26px;
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.feature-grid{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.feature-card{
  min-height: 158px;
  padding: 18px 14px;
  border-radius: 26px;
  background: var(--surface);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  backdrop-filter: blur(12px);
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.feature-card:hover{
  background: var(--surface-strong);
  box-shadow: var(--shadow-md);
}

.feature-card:active{
  transform: scale(0.985);
}

.feature-card .icon{
  width: 62px;
  height: 62px;
  display: grid;
  place-items: center;
  border-radius: 20px;
  margin-bottom: 12px;
  font-size: 34px;
  background: linear-gradient(135deg, #f4f0ff, #ebf7ff);
}

.feature-card .title{
  font-size: 18px;
  line-height: 1.35;
  font-weight: 800;
  color: #6a57bb;
  word-break: keep-all;
}

.settings-card,
.info-card{
  background: var(--surface);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm);
  border-radius: 24px;
  padding: 18px 16px;
  backdrop-filter: blur(12px);
}

.settings-card{
  display: grid;
  gap: 14px;
}

.setting-row{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(102, 112, 133, 0.14);
}

.setting-row:last-child{
  border-bottom: none;
  padding-bottom: 0;
}

.setting-row span:first-child{
  font-weight: 700;
}

.value{
  color: var(--text-sub);
  font-weight: 700;
  text-align: right;
}

.info-card{
  margin-top: 16px;
}

.info-card h3{
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.3;
  font-weight: 800;
}

.info-card p{
  margin: 0;
  color: var(--text-sub);
  font-size: 14px;
  line-height: 1.7;
}

.bottom-nav{
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 30;
  width: 100%;
  max-width: 520px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding: 10px 12px calc(10px + env(safe-area-inset-bottom));
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(16px);
  border-top: 1px solid rgba(50, 60, 90, 0.08);
  box-shadow: 0 -8px 30px rgba(43,53,88,0.06);
}

.nav-item{
  min-height: 58px;
  border-radius: 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  color: #5f6475;
  transition: background 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.nav-item.active{
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 800;
}

.nav-item:active{
  transform: scale(0.97);
}

.nav-icon{
  font-size: 20px;
  line-height: 1;
}

.nav-text{
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.01em;
}

.hidden{
  display: none !important;
}

/* 共通カードを後から増やしやすいように追加 */
.card{
  background: var(--surface);
  border: 1px solid var(--card-border);
  border-radius: 24px;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(12px);
  padding: 18px 16px;
}

.card + .card{
  margin-top: 14px;
}

/* 後から危険度カードを追加しやすい枠 */
.status-card{
  border-radius: 24px;
  padding: 18px 16px;
  background: linear-gradient(135deg, #fff8ec, #fff1f1);
  border: 1px solid rgba(255,255,255,0.7);
  box-shadow: var(--shadow-sm);
}

.status-card h3{
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 800;
}

.status-card p{
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-sub);
}

/* アクセシビリティ */
:focus-visible{
  outline: 3px solid rgba(79,141,247,0.35);
  outline-offset: 3px;
  border-radius: 18px;
}

@media (max-width: 360px){
  .brand h1{
    font-size: 20px;
  }

  .hero-card h2{
    font-size: 24px;
  }

  .feature-wide-card .label{
    font-size: 18px;
  }

  .feature-card{
    min-height: 144px;
    border-radius: 22px;
  }

  .feature-card .title{
    font-size: 16px;
  }
}

@media (min-width: 768px){
  body{
    padding: 18px 0;
  }

  .app-shell{
    border-radius: 34px;
    overflow: hidden;
    min-height: calc(100vh - 36px);
    box-shadow: 0 18px 60px rgba(43,53,88,0.14);
  }

  .main-content{
    padding: 10px 20px 24px;
  }

  .feature-grid{
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .bottom-nav{
    border-radius: 22px 22px 0 0;
  }
}