:root {
    --bg: #f3f5f8;
    --panel: #ffffff;
    --text: #20242a;
    --muted: #67707d;
    --header: #101820;
    --header-text: #ffffff;
    --accent: #135ccd;
    --border: #e2e8f0;
    --shadow: rgba(0,0,0,0.06);
}

:root[data-theme="dark"] {
    --bg: #0f172a;
    --panel: #111827;
    --text: #e5e7eb;
    --muted: #94a3b8;
    --header: #020617;
    --header-text: #ffffff;
    --accent: #38bdf8;
    --border: #334155;
    --shadow: rgba(0,0,0,0.32);
}

*{box-sizing:border-box}
body{margin:0;font-family:Segoe UI,Arial,sans-serif;background:var(--bg);color:var(--text)}
header{background:var(--header);color:var(--header-text);padding:18px 28px;display:flex;justify-content:space-between;align-items:center}
header h1{margin:0 0 4px 0;font-size:24px}
header span{color:#c9d1d9}
nav{display:flex;gap:16px;align-items:center}
nav a{color:white;text-decoration:none}
.nav-button{background:transparent;border:1px solid rgba(255,255,255,.35);padding:8px 10px}
main{max-width:1300px;margin:24px auto;padding:0 18px}
.controls{display:flex;gap:18px;align-items:flex-end;background:var(--panel);padding:18px;border-radius:14px;box-shadow:0 4px 18px var(--shadow);margin-bottom:18px}
.controls div{display:flex;flex-direction:column}
.select-panel select{height:auto;min-width:320px}
label{font-size:13px;color:var(--muted);margin-bottom:6px}
select,input{padding:10px 12px;border:1px solid var(--border);border-radius:10px;min-width:220px;background:var(--panel);color:var(--text)}
button{padding:11px 18px;border:none;background:var(--accent);color:white;border-radius:10px;cursor:pointer;font-weight:600}
button:hover{filter:brightness(.94)}
.small-actions{display:flex!important;flex-direction:row!important;gap:8px;margin-top:8px}
.small-actions button{padding:8px 10px}
.button-stack{display:flex!important;gap:10px}
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:18px}
.card,.chart-card,.table-card{background:var(--panel);border-radius:14px;box-shadow:0 4px 18px var(--shadow);padding:18px;border:1px solid var(--border)}
.card .label{font-size:13px;color:var(--muted)}
.card .value{font-size:34px;font-weight:700;margin-top:8px}
.chart-card{height:520px;margin-bottom:18px}
.chart-card h2,.table-card h2{margin:0 0 12px 0}
.table-card{margin-bottom:18px}
.login-body{min-height:100vh;display:grid;place-items:center}
.login-card{width:380px;background:var(--panel);padding:28px;border-radius:18px;box-shadow:0 10px 35px var(--shadow)}
.login-card h1{margin-top:0}
.login-card form{display:flex;flex-direction:column;gap:10px}
.login-card input{min-width:100%}
.hint{color:var(--muted);margin-top:14px;font-size:13px}
.flash{padding:10px 12px;border-radius:10px;margin-bottom:12px}
.flash.error{background:#ffe3e3;color:#9b1c1c}
.flash.ok{background:#e4ffe9;color:#166534}
.user-form{display:flex;flex-direction:column;gap:10px;max-width:420px}
.checkbox{display:flex;align-items:center;gap:8px}
.checkbox input{min-width:auto}
table{width:100%;border-collapse:collapse}
th,td{padding:10px 8px;border-bottom:1px solid var(--border);text-align:left}
@media(max-width:900px){.controls{flex-direction:column;align-items:stretch}.cards{grid-template-columns:1fr}header{flex-direction:column;gap:12px;align-items:flex-start}nav{flex-wrap:wrap}.select-panel select{min-width:100%;width:100%}}

.help-text{color:var(--muted);margin-top:0}.wide-input{width:100%;min-width:260px}.form-actions{margin-top:16px}
code{background:rgba(127,127,127,.12);padding:3px 6px;border-radius:6px}

.custom-range{display:none;gap:8px;align-items:flex-start}
.custom-range input{min-width:190px}
.link-button{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;padding:8px 10px;border-radius:8px;font-weight:600}
.inline-form{display:inline}
.danger-button{background:#b91c1c;padding:8px 10px;margin-left:6px}

.ranking-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.heatmap{overflow-x:auto}
.heatmap-table{border-collapse:collapse;min-width:900px;width:100%}
.heatmap-table th,.heatmap-table td{border:1px solid var(--border);padding:5px;text-align:center;font-size:12px}
.heatmap-table td{color:#111;font-weight:600;min-width:34px}
:root[data-theme="dark"] .heatmap-table td{color:#fff}
@media(max-width:900px){.ranking-grid{grid-template-columns:1fr}.button-stack{align-items:stretch}.custom-range{flex-direction:column!important}}