:root{
  font-family: system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,"Noto Sans JP","Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;
  color-scheme: light dark;

  --bg: #ffffff;
  --bg-elev: #f8f9fb;
  --text: #1f2328;
  --muted: #57606a;
  --border: #d0d7de;
  --link: #0b57d0;
  --ring: #2f81f7;

  --radius-sm: 8px;
  --radius-md: 12px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.08);

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;

  --sidebar-width: 220px;
  --ease-fast: 150ms ease;
}

@media (prefers-color-scheme: dark){
  :root{
    --bg: #0d1117;
    --bg-elev: #151b23;
    --text: #e6edf3;
    --muted: #9ba7b4;
    --border: #30363d;
    --link: #7fb3ff;
    --ring: #58a6ff;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
  }
}

:root[data-theme="light"]{
  --bg: #ffffff;
  --bg-elev: #f8f9fb;
  --text: #1f2328;
  --muted: #57606a;
  --border: #d0d7de;
  --link: #0b57d0;
  --ring: #2f81f7;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.08);
}

:root[data-theme="dark"]{
  --bg: #0d1117;
  --bg-elev: #151b23;
  --text: #e6edf3;
  --muted: #9ba7b4;
  --border: #30363d;
  --link: #7fb3ff;
  --ring: #58a6ff;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  line-height:1.65;
  background:var(--bg);
  color:var(--text);
  text-rendering:optimizeLegibility;
}

a{
  color:var(--link);
  text-underline-offset:2px;
  transition:color var(--ease-fast);
}
a:hover{text-decoration:underline}
a:focus-visible{text-decoration:underline;text-decoration-thickness:2px}

.app-shell{
  min-height:100vh;
}

.container{
  max-width:1100px;
  margin:0 auto;
  width:100%;
  padding:16px var(--space-5) var(--space-5);
}

.brand a{
  text-decoration:none;
  font-size:clamp(1.2rem, 1.1rem + 0.6vw, 1.6rem);
  font-weight:800;
  letter-spacing:0.008em;
  color:var(--text);
  line-height:1.1;
}

.sidebar{
  position:fixed;
  inset:0 auto 0 0;
  z-index:30;
  width:var(--sidebar-width);
  border-right:1px solid var(--border);
  background:linear-gradient(180deg, color-mix(in oklab, var(--bg-elev) 88%, var(--bg)) 0%, var(--bg) 100%);
  box-shadow:var(--shadow-sm);
  transition:width var(--ease-fast), transform var(--ease-fast);
}

.sidebar-inner{
  display:flex;
  flex-direction:column;
  gap:var(--space-5);
  height:100%;
  padding:var(--space-4);
}

.sidebar-top{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:var(--space-3);
}

.sidebar-nav{
  display:flex;
  flex-direction:column;
  gap:var(--space-2);
}

.sidebar-nav a,
.sidebar-actions .theme-toggle,
.sidebar-actions .logout-button{
  display:flex;
  align-items:center;
  justify-content:flex-start;
  min-height:44px;
  width:100%;
  padding:0 12px;
  border-radius:var(--radius-md);
  text-decoration:none;
  color:var(--text);
  background:transparent;
}

.nav-short{
  display:none;
}

.sidebar-nav a:hover,
.sidebar-actions .theme-toggle:hover,
.sidebar-actions .logout-button:hover,
.sidebar-toggle:hover,
.sidebar-fab:hover{
  background:color-mix(in oklab, var(--bg-elev) 86%, var(--link) 14%);
  text-decoration:none;
}

.sidebar-actions{
  display:grid;
  gap:var(--space-2);
  margin-top:auto;
}

.logout-form{
  margin:0;
}

.sidebar-actions .logout-button{
  border:1px solid var(--border);
  cursor:pointer;
  font:inherit;
  text-align:left;
}

.main-content{
  width:100%;
  min-height:100vh;
  padding-left:var(--sidebar-width);
  transition:padding-left var(--ease-fast);
}

.sidebar-toggle,
.sidebar-fab,
.theme-toggle{
  border:1px solid var(--border);
  background:var(--bg-elev);
  color:var(--text);
  border-radius:var(--radius-sm);
  min-height:40px;
  min-width:40px;
  padding:4px 10px;
  cursor:pointer;
  transition:background var(--ease-fast), border-color var(--ease-fast), transform var(--ease-fast);
}

.sidebar-toggle{
  flex:0 0 auto;
}

.sidebar-fab{
  position:fixed;
  top:16px;
  left:16px;
  z-index:35;
  display:none;
}

.muted{color:var(--muted);font-size:.95em}

.lang-toggle{
  display:flex;
  align-items:center;
  gap:6px;
  padding:3px;
  border:1px solid color-mix(in oklab, var(--border) 76%, transparent);
  border-radius:999px;
  background:color-mix(in oklab, var(--bg) 90%, var(--bg-elev));
}

.lang-btn{
  border:1px solid transparent;
  background:transparent;
  color:color-mix(in oklab, var(--text) 44%, var(--muted));
  border-radius:999px;
  padding:5px 11px;
  font-size:.78rem;
  font-weight:700;
  cursor:pointer;
  transition:border-color var(--ease-fast), background var(--ease-fast), color var(--ease-fast), box-shadow var(--ease-fast);
}

.lang-btn:hover{
  color:var(--text);
  border-color:transparent;
  background:color-mix(in oklab, var(--bg-elev) 82%, var(--bg));
}

.lang-btn.active{
  color:var(--text);
  border-color:color-mix(in oklab, var(--border) 80%, transparent);
  background:color-mix(in oklab, var(--bg) 96%, var(--bg-elev));
  box-shadow:0 1px 2px rgba(15, 23, 42, 0.06);
}

.lang-en{display:none}
:root[data-ui-lang="en"] .lang-ja{display:none}
:root[data-ui-lang="en"] .lang-en{display:inline}

.search-form{
  display:flex;
  flex-wrap:wrap;
  gap:var(--space-3);
  align-items:center;
  margin:var(--space-3) 0 var(--space-5);
}

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

select{
  border:1px solid var(--border);
  background:var(--bg-elev);
  color:var(--text);
  border-radius:var(--radius-sm);
  padding:7px 10px;
  min-height:36px;
  transition:border-color var(--ease-fast), box-shadow var(--ease-fast), background var(--ease-fast);
}
select:hover{border-color:color-mix(in oklab, var(--link) 30%, var(--border))}
select:focus-visible{box-shadow:0 0 0 3px color-mix(in oklab, var(--ring) 20%, transparent)}

:focus-visible{
  outline:2px solid var(--ring);
  outline-offset:2px;
  border-radius:6px;
}

@media (max-width: 760px){
  .sidebar{
    transform:translateX(-100%);
    width:min(78vw, 280px);
  }

  .main-content{
    padding-left:0;
  }

  .sidebar-fab{
    display:inline-flex;
    align-items:center;
    justify-content:center;
  }

}

@media (max-width: 760px){
  .container{padding:var(--space-4)}
  .brand a{
    font-size:1.28rem;
  }
}