/* =============================
   cocochart — style.css
   ============================= */

/* --- Variables --- */
:root {
  --bg:        #ffffff;
  --bg2:       #f7f7f5;
  --bg3:       #efefeb;
  --card:      #ffffff;
  --border:    rgba(0,0,0,0.09);
  --border2:   rgba(0,0,0,0.16);
  --txt:       #1a1a18;
  --txt2:      #5c5c58;
  --txt3:      #9a9a94;
  --accent:    #e84c3a;
  --accent-bg: #fdf0ee;
  --up:        #2a9e58;
  --down:      #3a7ee8;
  --new-color: #e84c3a;
  --gold:      #e8a800;
  --silver:    #909090;
  --bronze:    #b87840;
  --nav-bg:    rgba(255,255,255,0.94);
  --footer-bg: #18181a;
  --footer-txt:#a0a09a;
  --shadow:    0 1px 4px rgba(0,0,0,0.07);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.10);
  --radius:    10px;
  --radius-sm: 6px;
}

[data-theme="dark"] {
  --bg:        #16161a;
  --bg2:       #1e1e22;
  --bg3:       #26262c;
  --card:      #1e1e22;
  --border:    rgba(255,255,255,0.08);
  --border2:   rgba(255,255,255,0.15);
  --txt:       #eeeee8;
  --txt2:      #a0a09a;
  --txt3:      #606060;
  --accent:    #ff6654;
  --accent-bg: #281e1c;
  --up:        #3aba6e;
  --down:      #5a9cff;
  --new-color: #ff6654;
  --nav-bg:    rgba(22,22,26,0.94);
  --footer-bg: #0e0e10;
  --footer-txt:#606060;
  --shadow:    0 1px 4px rgba(0,0,0,0.3);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.4);
}

/* --- Reset --- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Hiragino Sans','Noto Sans JP','Yu Gothic UI',sans-serif;
  background:var(--bg);
  color:var(--txt);
  line-height:1.6;
  transition:background .3s,color .3s;
  min-height:100vh;
}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{cursor:pointer;font-family:inherit}

/* --- Nav --- */
.nav{
  position:sticky;top:0;z-index:200;
  background:var(--nav-bg);
  border-bottom:0.5px solid var(--border);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
}
.nav-inner{
  max-width:1200px;margin:0 auto;padding:0 20px;
  height:56px;display:flex;align-items:center;gap:20px;
}
.nav-logo{
  font-size:19px;font-weight:800;letter-spacing:-0.5px;
  color:var(--accent);flex-shrink:0;
}
.nav-links{
  display:flex;gap:2px;flex:1;overflow-x:auto;scrollbar-width:none;
}
.nav-links::-webkit-scrollbar{display:none}
.nav-link{
  white-space:nowrap;font-size:13px;padding:6px 12px;
  border-radius:20px;color:var(--txt2);transition:all .2s;
}
.nav-link:hover,.nav-link.active{background:var(--bg3);color:var(--txt)}
.nav-right{display:flex;align-items:center;gap:8px;flex-shrink:0}
.icon-btn{
  width:34px;height:34px;border-radius:50%;
  border:0.5px solid var(--border);background:var(--bg3);
  color:var(--txt2);font-size:16px;
  display:flex;align-items:center;justify-content:center;
  transition:all .2s;
}
.icon-btn:hover{border-color:var(--border2);color:var(--txt)}
.ham-btn{display:none}

/* mobile nav */
.mobile-menu{
  display:none;
  position:fixed;top:56px;left:0;right:0;bottom:0;
  background:var(--bg);z-index:190;
  padding:20px;overflow-y:auto;
}
.mobile-menu.open{display:block}
.mobile-menu a{
  display:block;padding:14px 0;
  border-bottom:0.5px solid var(--border);
  font-size:15px;color:var(--txt2);
}
.mobile-menu a:hover{color:var(--txt)}

/* --- Hero --- */
.hero{
  background:var(--bg2);
  border-bottom:0.5px solid var(--border);
  padding:52px 20px 44px;text-align:center;
}
.hero-badge{
  display:inline-block;font-size:11px;font-weight:700;
  letter-spacing:.1em;text-transform:uppercase;
  color:var(--accent);background:var(--accent-bg);
  border:0.5px solid var(--accent);border-radius:20px;
  padding:3px 12px;margin-bottom:16px;
}
.hero h1{
  font-size:clamp(26px,5vw,44px);font-weight:800;
  letter-spacing:-1px;line-height:1.15;margin-bottom:12px;
}
.hero h1 span{color:var(--accent)}
.hero-sub{
  font-size:14px;color:var(--txt2);
  max-width:480px;margin:0 auto 28px;
}
.hero-stats{display:flex;justify-content:center;gap:40px;flex-wrap:wrap}
.stat-num{display:block;font-size:26px;font-weight:800;color:var(--accent)}
.stat-lbl{font-size:11px;color:var(--txt3)}

/* --- Container / Layout --- */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.main-layout{
  display:grid;grid-template-columns:1fr 300px;
  gap:32px;padding:36px 0 64px;
}

/* --- Section header --- */
.sec-head{
  display:flex;align-items:center;justify-content:space-between;
  margin-bottom:16px;
}
.sec-title{
  font-size:15px;font-weight:700;
  display:flex;align-items:center;gap:8px;
}
.sec-title::before{
  content:'';display:inline-block;
  width:3px;height:15px;
  background:var(--accent);border-radius:2px;
}
.sec-meta{font-size:11px;color:var(--txt3)}

/* --- Genre tabs --- */
.genre-tabs{
  display:flex;gap:8px;margin-bottom:20px;
  overflow-x:auto;scrollbar-width:none;padding-bottom:2px;
}
.genre-tabs::-webkit-scrollbar{display:none}
.gtab{
  white-space:nowrap;font-size:12px;
  padding:5px 14px;border-radius:20px;
  border:0.5px solid var(--border);
  background:var(--card);color:var(--txt2);
  transition:all .2s;flex-shrink:0;
}
.gtab:hover{border-color:var(--accent);color:var(--accent)}
.gtab.active{
  background:var(--accent);color:#fff;
  border-color:var(--accent);font-weight:600;
}

/* --- Chart list --- */
.chart-list{display:flex;flex-direction:column;gap:6px}
.chart-item{
  display:grid;
  grid-template-columns:44px 52px 1fr auto;
  align-items:center;gap:12px;
  background:var(--card);
  border:0.5px solid var(--border);
  border-radius:var(--radius);
  padding:10px 14px;
  transition:all .2s;
  cursor:pointer;
}
.chart-item:hover{
  border-color:var(--border2);
  box-shadow:var(--shadow-lg);
  transform:translateX(2px);
}
.rank-num{
  font-size:20px;font-weight:800;
  text-align:center;line-height:1;
  color:var(--txt3);
  min-width:36px;
}
.rank-num.r1{color:var(--gold)}
.rank-num.r2{color:var(--silver)}
.rank-num.r3{color:var(--bronze)}
.artwork{
  width:52px;height:52px;border-radius:8px;
  object-fit:cover;background:var(--bg3);
  flex-shrink:0;
}
.artwork-placeholder{
  width:52px;height:52px;border-radius:8px;
  background:var(--bg3);display:flex;
  align-items:center;justify-content:center;
  font-size:20px;flex-shrink:0;
}
.song-info{min-width:0}
.song-title{
  font-size:14px;font-weight:600;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
  margin-bottom:3px;
}
.song-artist{
  font-size:12px;color:var(--txt2);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.song-meta{display:flex;align-items:center;gap:6px;margin-top:4px}
.badge{
  font-size:10px;font-weight:700;
  padding:2px 6px;border-radius:4px;
  letter-spacing:.04em;
}
.badge-new{background:var(--accent-bg);color:var(--new-color)}
.rank-change{
  font-size:12px;font-weight:700;
  text-align:right;min-width:32px;
}
.rank-up{color:var(--up)}
.rank-down{color:var(--down)}
.rank-same{color:var(--txt3)}

/* loading / error */
.loading-state,.error-state{
  padding:60px 20px;text-align:center;
  color:var(--txt3);font-size:14px;
}
.spinner{
  width:32px;height:32px;border:3px solid var(--border);
  border-top-color:var(--accent);border-radius:50%;
  animation:spin .8s linear infinite;
  margin:0 auto 12px;
}
@keyframes spin{to{transform:rotate(360deg)}}

/* --- Sidebar --- */
.sidebar{display:flex;flex-direction:column;gap:24px}
.sidebar-card{
  background:var(--card);
  border:0.5px solid var(--border);
  border-radius:var(--radius);
  padding:16px;
}
.sidebar-card-title{
  font-size:13px;font-weight:700;
  margin-bottom:12px;
  display:flex;align-items:center;gap:6px;
}
/* top5 mini list */
.mini-list{display:flex;flex-direction:column;gap:8px}
.mini-item{
  display:flex;align-items:center;gap:10px;
  font-size:13px;
}
.mini-rank{
  font-size:13px;font-weight:800;
  width:20px;text-align:center;
  color:var(--txt3);flex-shrink:0;
}
.mini-rank.r1{color:var(--gold)}
.mini-rank.r2{color:var(--silver)}
.mini-rank.r3{color:var(--bronze)}
.mini-art{
  width:36px;height:36px;border-radius:6px;
  object-fit:cover;background:var(--bg3);flex-shrink:0;
}
.mini-info{min-width:0}
.mini-title{
  font-size:12px;font-weight:600;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.mini-artist{font-size:11px;color:var(--txt2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* genre dist */
.genre-bars{display:flex;flex-direction:column;gap:8px}
.genre-bar-row{display:flex;align-items:center;gap:8px;font-size:12px}
.genre-bar-label{width:80px;color:var(--txt2);flex-shrink:0;font-size:11px}
.genre-bar-track{flex:1;height:6px;background:var(--bg3);border-radius:3px;overflow:hidden}
.genre-bar-fill{height:100%;background:var(--accent);border-radius:3px;transition:width .6s ease}
.genre-bar-pct{width:28px;text-align:right;color:var(--txt3);font-size:11px}

/* related sites */
.related-links{display:flex;flex-direction:column;gap:6px}
.related-link{
  display:flex;align-items:center;gap:8px;
  padding:8px 10px;border-radius:var(--radius-sm);
  border:0.5px solid var(--border);
  font-size:12px;color:var(--txt2);
  transition:all .2s;
}
.related-link:hover{border-color:var(--border2);color:var(--txt)}

/* --- About section --- */
.about-section{
  background:var(--bg2);
  border-top:0.5px solid var(--border);
  padding:48px 20px;
}
.about-grid{
  display:grid;grid-template-columns:repeat(3,1fr);
  gap:20px;margin-top:28px;
}
.about-card{
  background:var(--card);
  border:0.5px solid var(--border);
  border-radius:var(--radius);
  padding:20px;
}
.about-icon{font-size:24px;margin-bottom:10px}
.about-card h3{font-size:14px;font-weight:700;margin-bottom:6px}
.about-card p{font-size:13px;color:var(--txt2);line-height:1.6}

/* --- Footer --- */
.footer{
  background:var(--footer-bg);
  color:var(--footer-txt);
  padding:40px 20px 24px;
  border-top:0.5px solid rgba(255,255,255,0.06);
}
.footer-inner{max-width:1200px;margin:0 auto}
.footer-top{
  display:grid;grid-template-columns:1fr 1fr 1fr;
  gap:32px;margin-bottom:32px;
}
.footer-logo{
  font-size:20px;font-weight:800;
  color:#fff;letter-spacing:-0.5px;margin-bottom:8px;
}
.footer-desc{font-size:12px;line-height:1.7}
.footer-col h4{font-size:12px;font-weight:700;color:#fff;margin-bottom:10px}
.footer-col a{
  display:block;font-size:12px;
  color:var(--footer-txt);padding:3px 0;
  transition:color .2s;
}
.footer-col a:hover{color:#fff}
.footer-bottom{
  border-top:0.5px solid rgba(255,255,255,0.08);
  padding-top:20px;
  display:flex;justify-content:space-between;align-items:center;
  flex-wrap:wrap;gap:8px;
  font-size:11px;
}

/* --- Responsive --- */
@media(max-width:900px){
  .main-layout{grid-template-columns:1fr}
  .sidebar{display:grid;grid-template-columns:1fr 1fr;gap:20px}
  .about-grid{grid-template-columns:1fr 1fr}
  .footer-top{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .nav-links{display:none}
  .ham-btn{display:flex}
  .hero{padding:36px 16px 32px}
  .hero-stats{gap:24px}
  .main-layout{padding:24px 0 48px}
  .chart-item{grid-template-columns:36px 44px 1fr auto;gap:8px;padding:8px 10px}
  .rank-num{font-size:16px}
  .artwork{width:44px;height:44px}
  .artwork-placeholder{width:44px;height:44px}
  .song-title{font-size:13px}
  .sidebar{grid-template-columns:1fr}
  .about-grid{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr}
}