:root {
  --bg: #f2f7ff;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #d1d5db;
  --primary: #2563eb;
  --primary-soft: #dbeafe;
  --red: #ef4444;
  --radius: 16px;
  --shadow: 0 8px 20px rgba(15, 23, 42, 0.08);
  --max: 960px;
}

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

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans JP",
    "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.7;
  color: var(--text);
  background: linear-gradient(180deg, #e0f2fe 0%, #f2f7ff 100%);
}

/* ===== LAYOUT ===== */
.container_header {
  max-width: var(--max);
  padding: 0 16px;
  margin: 20px auto;
  text-align: center;
}

.container_panel {
  max-width: var(--max);
  padding: 0;
  margin: 20px auto;
}

/* ===== WEATHER ===== */
.Box2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 10px;
}

@media (min-width: 720px) {
  .Box2 {
    grid-template-columns: 240px 1fr;
  }
}

.Box2-1 {
  display: grid;
  gap: 10px;
  justify-items: center;
  text-align: center;
}

/* ===== ICON ===== */
#emoji img {
  max-width: 220px;
  width: 100%;
  height: auto;
  filter: drop-shadow(0 12px 24px rgba(0,0,0,0.15));
}

@media (max-width: 490px) {
  #emoji img {
    max-width: 160px;
  }
}

/* ===== DATA CARD ===== */
.Box2-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  border-radius: 14px;
  padding: 10px;
  background: rgba(255,255,255,0.55);
  backdrop-filter: blur(6px);
}

@media (min-width: 520px) {
  .Box2-2 {
    grid-template-columns: 1fr 1fr;
  }
}

/* ===== ITEM ===== */
.Box2-2-1 > div {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px;
  border-radius: 12px;
  background: rgba(255,255,255,0.8);
}

/* ===== NUMBER ===== */
.kyouchou {
  font-size: 2em;
  font-weight: 800;
}

#wbgt .kyouchou,
#wbgt-sisuu .kyouchou {
  font-size: 2.6em;
  color: #dc2626;
}

/* ===== LABEL ===== */
#ondo,
#shitudo,
#wbgt,
#taikan,
#wind,
#lat_text,
#lon_text {
  font-size: 0.85rem;
  color: var(--muted);
}

/* ===== HEADER ===== */
.site-header {
  padding: 28px 0;
  text-align: center;
}

.badge {
  font-size: 12px;
  font-weight: 800;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.06);
  border: 1px solid rgba(37, 99, 235, 0.3);
  color: #1d4ed8;
}

.site-header h1 {
  margin: 14px 0 10px;
  font-size: clamp(22px, 4.2vw, 30px);
}

.lead {
  font-size: 14px;
}

/* ===== PANEL ===== */
.panel {
  margin-top: 20px;
  padding: 20px;
  border-radius: var(--radius);
  background: rgba(255,255,255,0.95);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.panel.danger {
  border-color: #bfdbfe;
  box-shadow: 0 12px 28px rgba(191, 219, 254, 0.6);
}

/* ===== WBGT ===== */
.wbgt-panel {
  display: grid;
  gap: 12px;
  margin-top: 10px;
}

@media (min-width: 720px) {
  .wbgt-panel {
    grid-template-columns: 240px 1fr;
  }
}

.wbgt-naiyou {
  background: rgba(255,255,255,0.85);
  border-radius: 14px;
  padding: 16px;
}

#shisuu {
  font-size: 1.6rem;
  font-weight: 900;
}

#chuui {
  font-size: 1rem;
}

/* ===== NOTE ===== */
.Box3 {
  font-size: 12px;
  color: var(--muted);
  margin-top: 12px;
}

/* ============================= */
/* 🔥 ホームに戻るボタン（改善版） */
/* ============================= */

.center{
  text-align:center;
  margin:32px auto 16px;
}

.home-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;

  width:260px;
  padding:14px;

  border-radius:14px;
  text-decoration:none;

  font-size:15px;
  font-weight:700;

  color:#2563eb;
  background:#ffffff;

  border:2px solid #2563eb;

  box-shadow:0 8px 18px rgba(37,99,235,0.15);

  transition: all .2s ease;
}

/* 押したとき（スマホ重要） */
.home-btn:active{
  transform:scale(0.97);
  background:#2563eb;
  color:#ffffff;
}

/* ============================= */

/* ===== MOBILE ===== */
@media (max-width: 600px) {
  .panel {
    padding: 16px;
  }

  .site-header h1 {
    font-size: 22px;
  }

  .lead {
    font-size: 13px;
  }

  .home-btn{
    width:100%;
    max-width:320px;
  }
}