/* ===========================
   cocoair — top page (design/top.png)
   =========================== */
:root{
  --blue:#1a5fd6;
  --blue-d:#0d47a1;
  --blue-l:#e3edfb;
  --bg:#eef3fa;
  --card:#ffffff;
  --text:#1e2a3a;
  --text2:#5a6b80;
  --text3:#93a3b8;
  --border:#e3eaf4;
  --good:#43a047;
  --mod:#f0b429;
  --usg:#fb8c00;
  --bad:#e53935;
  --vbad:#8e24aa;
  --shadow:0 4px 20px rgba(30,60,110,.08);
  --radius:16px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:'Noto Sans JP',sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img,svg{max-width:100%}

/* ===== header ===== */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
}
.header-in{
  max-width:1200px;margin:0 auto;padding:10px 20px;
  display:flex;align-items:center;gap:24px;
}
.logo-wrap{flex-shrink:0}
.logo{display:flex;align-items:center;gap:8px;font-size:1.5rem;font-weight:900;color:var(--blue-d);letter-spacing:.5px}
.logo .logo-mark{width:30px;height:30px;flex-shrink:0}
.logo-tag{font-size:.68rem;color:var(--blue);font-weight:500;margin-top:-2px}
.gnav{display:flex;gap:4px;margin-left:auto}
.gnav a{
  font-size:.85rem;font-weight:500;color:var(--text);
  padding:8px 13px;border-radius:8px;white-space:nowrap;
  transition:background .15s,color .15s;
}
.gnav a:hover{background:var(--blue-l);color:var(--blue)}
.hd-search{
  width:38px;height:38px;border-radius:50%;border:none;cursor:pointer;
  background:var(--blue-l);color:var(--blue-d);font-size:15px;flex-shrink:0;
}
.hd-search:hover{background:#d3e3f8}
.search-drop{
  display:none;max-width:1200px;margin:0 auto;padding:0 20px 12px;
  gap:8px;
}
.search-drop.open{display:flex}
.search-drop input{
  flex:1;padding:10px 16px;border:1px solid var(--border);border-radius:10px;
  font-size:.9rem;font-family:inherit;outline:none;background:#fff;
}
.search-drop input:focus{border-color:var(--blue)}
.search-drop button{
  padding:10px 22px;border:none;border-radius:10px;background:var(--blue);
  color:#fff;font-weight:700;font-size:.85rem;cursor:pointer;font-family:inherit;
}
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}
.hamburger span{width:22px;height:2px;background:var(--text);border-radius:2px;transition:.2s}

/* ===== hero ===== */
.hero{
  position:relative;overflow:hidden;
  background:url("img/hero-bg.png") center/cover no-repeat,
    linear-gradient(180deg,#aecdf0 0%,#cfe2f6 45%,#e9f2fb 100%);
}
.hero::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(90deg,rgba(255,255,255,.55) 0%,rgba(255,255,255,.25) 45%,rgba(255,255,255,0) 70%);
  pointer-events:none;
}
.hero::after{
  content:"";position:absolute;top:-80px;left:-80px;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,255,255,.75),rgba(255,255,255,0) 65%);
  pointer-events:none;
}
.hero-in{
  position:relative;z-index:1;
  max-width:1200px;margin:0 auto;padding:36px 20px 48px;
  display:grid;grid-template-columns:1fr 560px;gap:36px;align-items:center;
}
.hero-copy h1{
  font-size:2.15rem;font-weight:900;line-height:1.45;color:#20334c;
  text-shadow:0 1px 0 rgba(255,255,255,.6);
}
.hero-copy h1 .em{color:var(--blue)}
.hero-lead{margin:18px 0 26px;font-size:.92rem;color:#3d5270;max-width:420px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.btn-p,.btn-s{
  display:inline-flex;align-items:center;gap:8px;
  padding:13px 26px;border-radius:999px;font-size:.9rem;font-weight:700;
  cursor:pointer;border:none;font-family:inherit;transition:transform .15s,box-shadow .15s;
}
.btn-p{background:var(--blue);color:#fff;box-shadow:0 6px 16px rgba(26,95,214,.35)}
.btn-s{background:rgba(255,255,255,.85);color:var(--blue-d);border:1px solid rgba(26,95,214,.35)}
.btn-p:hover,.btn-s:hover{transform:translateY(-2px)}
.hero-update{
  display:flex;justify-content:flex-end;align-items:center;gap:14px;
  font-size:.72rem;color:#3d5270;margin-bottom:8px;
}
.live-dot{display:inline-flex;align-items:center;gap:5px}
.live-dot::before{
  content:"";width:8px;height:8px;border-radius:50%;background:#2e9e4f;
  animation:pulse 2s infinite;
}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}

/* ===== map card ===== */
.map-card{
  background:rgba(255,255,255,.94);border-radius:20px;box-shadow:var(--shadow);
  padding:20px 22px 16px;
}
.map-hd{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}
.map-hd h2{font-size:1.05rem;font-weight:900}
.link-more{font-size:.78rem;color:var(--blue);font-weight:700}
.link-more:hover{text-decoration:underline}
.map-body{position:relative}
.map-body svg{display:block;width:100%;height:auto}
.map-chip{
  position:absolute;transform:translate(-50%,-50%);
  background:#fff;border:1px solid var(--border);border-radius:10px;
  box-shadow:0 3px 10px rgba(30,60,110,.14);
  padding:5px 10px;text-align:left;line-height:1.3;min-width:74px;
}
.map-chip .r{font-size:.68rem;font-weight:700;color:var(--text)}
.map-chip .v{font-size:.62rem;color:var(--text2)}
.map-chip .v b{font-size:.95rem;font-weight:900;color:var(--text);margin-left:3px}
.map-chip .lv{display:flex;align-items:center;gap:4px;font-size:.62rem;color:var(--text2)}
.map-chip .lv i{width:7px;height:7px;border-radius:50%;display:inline-block;background:#ccc}
.map-legend{
  display:flex;flex-wrap:wrap;gap:14px;justify-content:center;
  border:1px solid var(--border);border-radius:12px;
  padding:9px 12px;margin-top:10px;background:#fff;
}
.map-legend span{display:inline-flex;align-items:center;gap:6px;font-size:.68rem;color:var(--text2)}
.map-legend i{width:9px;height:9px;border-radius:50%;display:inline-block}

/* ===== sections / cards ===== */
.wrap{max-width:1200px;margin:0 auto;padding:0 20px}
.sec{margin-top:28px}
.card{
  background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);
  padding:22px 24px;
}
.card-hd{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px;flex-wrap:wrap}
.card-hd h2{font-size:1.02rem;font-weight:900;display:flex;align-items:center;gap:8px}
.card-hd h2 .ico{
  width:26px;height:26px;border-radius:8px;background:var(--blue-l);
  display:inline-flex;align-items:center;justify-content:center;font-size:13px;color:var(--blue-d);
}
.grid-2{display:grid;grid-template-columns:1.6fr 1fr;gap:20px}
.grid-2r{display:grid;grid-template-columns:1fr 1.25fr;gap:20px}

/* tabs */
.tabs{display:flex;gap:4px;background:var(--bg);border-radius:999px;padding:3px}
.tabs button{
  border:none;background:none;font-family:inherit;cursor:pointer;
  font-size:.72rem;font-weight:700;color:var(--text2);
  padding:5px 14px;border-radius:999px;transition:.15s;
}
.tabs button.on{background:var(--blue);color:#fff}

/* charts */
.chart-box{position:relative}
.chart-box svg{display:block;width:100%;height:auto}
.chart-note{font-size:.68rem;color:var(--text3);text-align:right;margin-top:4px}
.chart-tip{
  position:absolute;pointer-events:none;display:none;z-index:5;
  background:#16233a;color:#fff;border-radius:10px;padding:8px 12px;
  font-size:.68rem;line-height:1.6;box-shadow:0 6px 18px rgba(0,0,0,.25);white-space:nowrap;
}
.chart-tip b{font-weight:700}
.chart-legend{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:6px}
.chart-legend span{display:inline-flex;align-items:center;gap:6px;font-size:.7rem;color:var(--text2)}
.chart-legend i{width:8px;height:8px;border-radius:50%;display:inline-block}

/* national trend + current value */
.trend-flex{display:flex;gap:18px;align-items:stretch}
.trend-flex .chart-box{flex:1;min-width:0}
.now-box{
  flex-shrink:0;width:170px;align-self:center;
  border:1px solid var(--border);border-radius:14px;padding:16px 14px;text-align:center;
  background:#fff;
}
.now-box .t{font-size:.68rem;color:var(--text2);font-weight:700}
.now-box .n{font-size:2.6rem;font-weight:900;line-height:1.15}
.now-box .l{font-size:.85rem;font-weight:900}

/* current location panel */
.loc-hd{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.loc-hd h2{font-size:1.02rem;font-weight:900}
.loc-city{display:flex;align-items:center;gap:7px;font-size:.9rem;font-weight:700;margin-bottom:12px;color:var(--text)}
.loc-city .pin{color:var(--blue)}
.loc-flex{display:flex;gap:16px;align-items:center}
.aqi-ring{position:relative;width:150px;height:150px;flex-shrink:0}
.aqi-ring svg{transform:rotate(-90deg)}
.aqi-ring .in{
  position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;
}
.aqi-ring .in .t{font-size:.7rem;font-weight:700;color:var(--text2)}
.aqi-ring .in .n{font-size:2.3rem;font-weight:900;line-height:1.1}
.aqi-ring .in .l{font-size:.8rem;font-weight:900}
.poll-list{flex:1;min-width:0}
.poll-list .row{
  display:flex;align-items:baseline;gap:8px;
  padding:7px 0;border-bottom:1px solid var(--border);font-size:.8rem;
}
.poll-list .row:last-child{border-bottom:none}
.poll-list .k{color:var(--text2);font-weight:500;flex:1}
.poll-list .v{font-weight:900;font-size:.95rem}
.poll-list .u{font-size:.66rem;color:var(--text3)}
.loc-upd{display:flex;align-items:center;gap:8px;font-size:.7rem;color:var(--text3);margin-top:10px}
.loc-upd button{
  border:none;background:none;cursor:pointer;font-size:.82rem;color:var(--blue);padding:0 2px;
}

/* featured areas */
.area-scroll{
  display:grid;grid-auto-flow:column;grid-auto-columns:172px;gap:14px;
  overflow-x:auto;padding:2px 2px 10px;scroll-snap-type:x mandatory;
}
.area-scroll::-webkit-scrollbar{height:8px}
.area-scroll::-webkit-scrollbar-thumb{background:#c8d6e8;border-radius:4px}
.area-card{
  scroll-snap-align:start;border-radius:14px;overflow:hidden;background:#fff;
  border:1px solid var(--border);box-shadow:0 2px 10px rgba(30,60,110,.06);
  transition:transform .15s,box-shadow .15s;display:block;
}
.area-card:hover{transform:translateY(-3px);box-shadow:0 8px 20px rgba(30,60,110,.14)}
.area-img{
  height:88px;position:relative;
  background-image:var(--skyline),linear-gradient(180deg,var(--sky1,#8fc1ee),var(--sky2,#d9ebfb));
  background-repeat:repeat-x,no-repeat;background-position:bottom center,center;background-size:auto 68%,cover;
}
.area-img img{width:100%;height:100%;object-fit:cover;display:block}
.area-body{padding:9px 12px 11px}
.area-name{display:flex;justify-content:space-between;align-items:center;font-size:.88rem;font-weight:900}
.area-name .ar{color:var(--text3);font-size:.75rem}
.area-aqi{display:flex;align-items:center;gap:6px;font-size:.72rem;color:var(--text2);margin-top:3px}
.area-aqi b{font-size:1rem;font-weight:900}
.area-aqi .dot{width:8px;height:8px;border-radius:50%;background:#ccc;flex-shrink:0}

/* ranking */
.rank-list{display:flex;flex-direction:column}
.rank-row{
  display:flex;align-items:center;gap:12px;
  padding:11px 4px;border-bottom:1px solid var(--border);font-size:.85rem;
}
.rank-row:last-child{border-bottom:none}
.rank-badge{
  width:30px;height:30px;border-radius:50%;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  font-weight:900;font-size:.8rem;background:var(--bg);color:var(--text2);
}
.rank-badge.r1{background:linear-gradient(135deg,#ffd54f,#ffb300);color:#7a4f00;font-size:.95rem}
.rank-badge.r2{background:linear-gradient(135deg,#e0e6ee,#b8c4d4);color:#4a5a70}
.rank-badge.r3{background:linear-gradient(135deg,#d7a86e,#b97b3d);color:#5c3410}
.rank-name{flex:1;font-weight:700;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rank-bar{flex:1.1;height:7px;background:var(--bg);border-radius:4px;overflow:hidden}
.rank-bar i{display:block;height:100%;border-radius:4px;background:var(--good);width:0;transition:width .6s}
.rank-num{width:34px;text-align:right;font-weight:900;font-size:1rem}
.rank-lv{width:56px;text-align:right;font-size:.72rem;font-weight:700}

/* news */
.news-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:14px}
.news-card{
  background:#fff;border:1px solid var(--border);border-radius:12px;padding:14px 16px;
  transition:border-color .15s,transform .15s;display:block;
}
.news-card:hover{border-color:var(--blue);transform:translateY(-2px)}
.news-meta{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.news-tag{
  font-size:.62rem;font-weight:700;color:#fff;background:var(--blue);
  border-radius:5px;padding:2px 8px;
}
.news-tag.c2{background:#2e9e4f}
.news-tag.c3{background:#f57c00}
.news-date{font-size:.66rem;color:var(--text3)}
.news-title{font-size:.82rem;font-weight:700;line-height:1.55}

/* features */
.feat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.feat{
  background:#fff;border-radius:14px;box-shadow:var(--shadow);
  padding:18px;display:flex;gap:13px;align-items:flex-start;
}
.feat .ic{
  width:44px;height:44px;border-radius:50%;background:var(--blue-l);flex-shrink:0;
  display:flex;align-items:center;justify-content:center;font-size:20px;
}
.feat b{font-size:.85rem;font-weight:900;display:block;margin-bottom:3px}
.feat p{font-size:.72rem;color:var(--text2);line-height:1.6}

/* SEO directory & info */
.dir-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px}
.dir-grid h3{font-size:.82rem;margin-bottom:6px}
.dir-grid .links{display:flex;flex-wrap:wrap;gap:6px;font-size:.76rem;color:var(--text2)}
.dir-grid .links a{color:var(--blue)}
.dir-grid .links a:hover{text-decoration:underline}
.scale-table{width:100%;border-collapse:collapse;font-size:.8rem}
.scale-table th,.scale-table td{padding:8px 10px;border-bottom:1px solid var(--border);text-align:left}
.scale-table th{color:var(--text2);font-size:.72rem}
.scale-dot{width:11px;height:11px;border-radius:50%;display:inline-block}
.about-p{font-size:.82rem;color:var(--text2)}
.sister-row{display:flex;gap:12px;flex-wrap:wrap}
.sister-row a{
  display:flex;gap:9px;align-items:center;font-size:.78rem;
  border:1px solid var(--border);border-radius:10px;padding:9px 14px;background:#fff;
}
.sister-row a:hover{border-color:var(--blue)}
.sister-row b{color:var(--blue-d)}

/* footer */
footer{margin-top:44px;background:#16233a;color:#c6d2e2;padding:34px 20px 26px}
.footer-in{max-width:1200px;margin:0 auto;text-align:center}
.footer-logo{font-size:1.3rem;font-weight:900;color:#fff;margin-bottom:14px}
.footer-logo span{color:#6ea8ff}
.footer-links{display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:center;font-size:.76rem;margin-bottom:16px}
.footer-links a:hover{color:#fff;text-decoration:underline}
.footer-copy{font-size:.7rem;color:#7f8fa6}

/* aqi colors */
.c-good{color:var(--good)}.c-mod{color:var(--mod)}.c-usg{color:var(--usg)}.c-bad{color:var(--bad)}.c-vbad{color:var(--vbad)}
.b-good{background:var(--good)}.b-mod{background:var(--mod)}.b-usg{background:var(--usg)}.b-bad{background:var(--bad)}.b-vbad{background:var(--vbad)}
.loading-text{color:var(--text3);font-size:.8rem}

/* ===== モバイル固定フッターメニュー（スマホのみ） ===== */
.mobile-fnav{display:none}
@media(max-width:640px){
  .mobile-fnav{
    display:flex;position:fixed;left:0;right:0;bottom:0;z-index:900;
    background:#fff;border-top:1px solid var(--border);
    box-shadow:0 -2px 14px rgba(30,60,110,.12);
    padding-bottom:env(safe-area-inset-bottom,0);
  }
  .mobile-fnav a{
    flex:1;display:flex;flex-direction:column;align-items:center;
    justify-content:center;gap:3px;padding:8px 2px 7px;
    color:var(--text2);font-size:.62rem;font-weight:600;line-height:1.1;
    transition:color .2s;
  }
  .mobile-fnav a .mf-ico{font-size:1.15rem;line-height:1}
  .mobile-fnav a.active,.mobile-fnav a:active{color:var(--blue)}
  body{padding-bottom:60px}
}

/* ===== responsive ===== */
@media(max-width:1020px){
  .hero-in{grid-template-columns:1fr;padding-top:28px}
  .hero-copy{text-align:center}
  .hero-lead{margin-left:auto;margin-right:auto}
  .hero-btns{justify-content:center}
  .grid-2,.grid-2r{grid-template-columns:1fr}
}
@media(max-width:760px){
  .gnav{
    display:none;position:absolute;top:100%;right:12px;
    flex-direction:column;background:#fff;border:1px solid var(--border);
    border-radius:12px;box-shadow:var(--shadow);padding:8px;min-width:180px;
  }
  .gnav.open{display:flex}
  .hamburger{display:flex}
  .hero-copy h1{font-size:1.55rem}
  .trend-flex{flex-direction:column}
  .now-box{width:100%}
  .loc-flex{flex-direction:column}
  .rank-bar{display:none}
  .map-chip{min-width:58px;padding:3px 7px}
  .map-chip .v b{font-size:.8rem}
}