:root{
  --bg:#f6f9ff;--card:#fff;--text:#161c22;--muted:#5d6574;--border:#dde3eb;--soft:#eef4fc;
  --primary:#1f6feb;--primary-strong:#0057c3;--primary-text:#fff;--secondary:#e3e9f1;
  --danger:#ba1a1a;--ok:#2e7d32;--warn:#e08a00;
  --liq-ok-1:#3b8cf5;--liq-ok-2:#0b55c9;--liq-low-1:#ffb43a;--liq-low-2:#e08a00;
  --tank-bg:#edf2f9;--tank-border:#c9d2df;--tank-cap:#5d6574;
  --radius:14px;--shadow:0 1px 2px rgba(22,28,34,.04),0 4px 14px rgba(22,28,34,.05);
}
@media (prefers-color-scheme: dark){
  :root{--bg:#0f1318;--card:#171d25;--text:#e6e9ee;--muted:#9aa5b4;--border:#29313c;--soft:#1d2530;
    --primary:#3b82f6;--primary-strong:#3b82f6;--secondary:#252d38;--danger:#ef5350;--ok:#66bb6a;--warn:#ffb300;
    --liq-ok-1:#4f97ff;--liq-ok-2:#1d5fd0;--liq-low-1:#ffc260;--liq-low-2:#e08a00;
    --tank-bg:#1d2530;--tank-border:#38424f;--tank-cap:#7c8797;--shadow:none;}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);
  font:16px/1.45 Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--primary)}
h1{font-size:1.5rem;margin:.2rem 0 1rem;letter-spacing:-.01em}
h2{font-size:1.15rem;margin:.2rem 0 .6rem}
h3{font-size:1rem;margin:0 0 .6rem}
.ico{flex:none;vertical-align:middle}
main{max-width:1100px;margin:0 auto;padding:16px}
main.narrow{max-width:400px;padding-top:6vh}

/* ---------- Kopfzeile */
.topbar{position:sticky;top:0;z-index:5;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:6px 16px;padding:10px 16px;background:var(--card);border-bottom:1px solid var(--border)}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;text-decoration:none;color:var(--text);font-size:1.1rem}
.logo{display:grid;place-items:center;width:32px;height:32px;border-radius:9px;background:var(--primary);color:#fff}
.topbar nav{display:flex;flex-wrap:wrap;align-items:center;gap:2px}
.topbar nav a,.navbtn{display:flex;align-items:center;gap:6px;padding:8px 12px;border-radius:9px;text-decoration:none;
  color:var(--text);font-size:.95rem;background:none;border:0;cursor:pointer;font-family:inherit;min-height:0;font-weight:500}
.topbar nav a:hover,.navbtn:hover{background:var(--soft)}
.topbar nav a.active{background:var(--primary);color:#fff}

/* ---------- Grundbausteine */
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px;margin-bottom:14px;box-shadow:var(--shadow)}
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}
.grid>.card{margin:0}
.row{display:flex;gap:8px;align-items:center}
.between{justify-content:space-between}.wrap{flex-wrap:wrap}
.muted{color:var(--muted)}.small{font-size:.875rem}.center{text-align:center}
.inline{display:inline}
.empty{text-align:center;padding:32px;color:var(--muted)}
.empty .button{margin-top:4px}
label{display:block;font-size:.9rem;color:var(--muted);margin-bottom:10px}
label.check{display:flex;gap:8px;align-items:center;color:var(--text)}
input,select{display:block;width:100%;margin-top:4px;padding:12px;font-size:16px;color:var(--text);font-family:inherit;
  background:var(--soft);border:1px solid var(--border);border-radius:10px}
input[type=checkbox]{width:auto;margin:0;transform:scale(1.2)}
input:focus,select:focus{outline:2px solid var(--primary);outline-offset:1px}
button,.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 16px;font-size:16px;
  font-weight:600;font-family:inherit;border:0;border-radius:10px;cursor:pointer;text-decoration:none;min-height:46px}
button.primary,.button.primary{background:var(--primary);color:var(--primary-text)}
button.primary:hover{background:var(--primary-strong)}
button.secondary{background:var(--secondary);color:var(--text)}
button.danger{background:transparent;color:var(--danger);border:1px solid var(--danger)}
button.small{padding:6px 12px;min-height:34px;font-size:.875rem}
button.block{width:100%;margin-top:12px}
button:active{transform:translateY(1px)}
.iconbtn{display:grid;place-items:center;width:36px;height:36px;border-radius:9px;color:var(--muted);text-decoration:none}
.iconbtn:hover{background:var(--soft);color:var(--primary)}
.badge{display:inline-block;padding:3px 9px;border-radius:999px;font-size:.75rem;font-weight:700;background:var(--secondary);color:var(--muted)}
.badge.warn{background:#fff1d6;color:#8a5300}
.badge.danger{background:#ffdad6;color:#93000a}
@media (prefers-color-scheme: dark){.badge.warn{background:#3d2c0b;color:#ffc260}.badge.danger{background:#3d1414;color:#ff8a80}}

/* ---------- Meldungen */
.flash{display:flex;align-items:center;gap:10px;padding:12px 14px;border-radius:10px;margin-bottom:14px;
  background:var(--card);border:1px solid var(--border);border-left-width:5px;box-shadow:var(--shadow);transition:opacity .6s}
.flash.success{border-left-color:var(--ok)}.flash.success .ico{color:var(--ok)}
.flash.error{border-left-color:var(--danger)}.flash.error .ico{color:var(--danger)}
.flash.info{border-left-color:var(--primary)}.flash.info .ico{color:var(--primary)}
.flash.fade{opacity:0;pointer-events:none}

/* ---------- Tank-Grafik */
.tank{position:relative;width:104px;height:156px;flex:none}
.tank-cap{position:absolute;top:0;left:calc(50% - 9px);transform:translateX(-50%);width:34px;height:9px;border-radius:3px;background:var(--tank-cap)}
.tank-body{position:absolute;top:11px;bottom:0;left:0;right:18px;overflow:hidden;
  border:2px solid var(--tank-border);border-radius:14px 14px 18px 18px;background:var(--tank-bg)}
.liquid{position:absolute;left:0;right:0;bottom:0;height:calc(var(--pct) * 1%);
  background:linear-gradient(90deg,var(--liq-ok-1),var(--liq-ok-2));transition:height .7s ease}
.wave{position:absolute;left:0;top:-7px;width:200%;height:8px;background:var(--liq-ok-1);
  -webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 8'%3E%3Cpath d='M0 4 Q10 0 20 4 T40 4 V8 H0z'/%3E%3C/svg%3E") repeat-x 0 0/40px 8px;
  mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 8'%3E%3Cpath d='M0 4 Q10 0 20 4 T40 4 V8 H0z'/%3E%3C/svg%3E") repeat-x 0 0/40px 8px;
  animation:wave 6s linear infinite}
@keyframes wave{to{transform:translateX(-50%)}}
.liquid::after{content:"";position:absolute;top:6px;bottom:8px;left:12%;width:6px;border-radius:3px;background:rgba(255,255,255,.22)}
.warnline{position:absolute;left:0;right:0;bottom:calc(var(--warnp) * 1%);border-top:2px dashed var(--warn);z-index:1}
.tank-scale{position:absolute;top:11px;bottom:0;right:0;width:12px}
.tank-scale i{position:absolute;right:0;width:8px;height:2px;margin-bottom:-1px;background:var(--tank-border);border-radius:1px}
.tank-scale i:nth-child(odd){width:12px}
.tank.st-low .liquid{background:linear-gradient(90deg,var(--liq-low-1),var(--liq-low-2))}
.tank.st-low .wave{background:var(--liq-low-1)}
.tank.st-empty .wave{display:none}
.tank.st-empty .tank-body{border-color:var(--danger)}
.tank-sm{width:22px;height:32px;margin-right:10px;vertical-align:middle;display:inline-block}
.tank-sm .tank-cap{left:50%;width:10px;height:4px;border-radius:1px}
.tank-sm .tank-body{top:5px;right:0;border-width:1.5px;border-radius:4px 4px 5px 5px}
.tank-sm .wave,.tank-sm .liquid::after{display:none}
@media (prefers-reduced-motion: reduce){.wave{animation:none}.liquid{transition:none}}

/* ---------- Behälter-Karte */
.tankcard{border-top:4px solid var(--primary)}
.tankcard.st-low{border-top-color:var(--warn)}
.tankcard.st-empty{border-top-color:var(--danger)}
.tankcard h2{margin:0;font-size:1.25rem}
.tankrow{display:flex;align-items:center;gap:22px;margin:14px 0 6px;padding:16px;border-radius:12px;background:var(--soft)}
.readout{min-width:0}
.readout .big{font-size:2.8rem;font-weight:700;line-height:1;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.readout .big small{font-size:1.1rem;font-weight:600;color:var(--primary);margin-left:4px}
.tankcard.st-low .readout .big small{color:var(--warn)}
.readout .muted{margin-top:6px}
.readout .pct{margin-top:2px;font-weight:600;color:var(--primary);font-variant-numeric:tabular-nums}
.tankcard.st-low .readout .pct{color:var(--warn)}
.tankcard.st-empty .readout .pct{color:var(--danger)}
form.book{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:12px}
.chips{grid-column:1/-1;display:flex;gap:6px}
.chip{flex:1;min-height:38px;padding:6px 10px;font-size:.9rem;font-weight:600;background:var(--card);color:var(--text);
  border:1px solid var(--border);border-radius:9px}
.chip:hover{border-color:var(--primary);color:var(--primary)}
form.book .amount{grid-column:1/-1;position:relative;margin:0}
form.book .amount input{font-size:1.25rem;padding-right:48px;margin:0}
form.book .amount span{position:absolute;right:14px;top:50%;transform:translateY(-50%);color:var(--muted)}

/* ---------- Login / PIN */
.login{text-align:center;padding:28px 22px}
.login h1{margin:10px 0 18px}
.login-logo{display:inline-grid;place-items:center;width:58px;height:58px;border-radius:16px;background:var(--soft);color:var(--primary)}
.login.admin .login-logo{background:var(--primary);color:#fff}
.login form.left{text-align:left}
.pin-display{text-align:center;font-size:1.8rem;letter-spacing:.5em;padding:12px 12px 12px calc(12px + .5em);margin:0 0 14px}
.pin-display::placeholder{color:var(--tank-border);letter-spacing:.5em}
.keys{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.keys button{min-height:58px;font-size:1.4rem;font-weight:500;background:var(--soft);color:var(--text);border-radius:12px}
.keys button:hover{background:var(--secondary)}
.keys .key-alt{background:var(--secondary);color:var(--muted);font-size:1.1rem}

/* ---------- Verlauf */
.history{list-style:none;padding:0;margin:0}
.history li{padding:12px 14px;margin-bottom:8px}
.history li .row+.row{margin-top:4px}
.history li.undone{opacity:.55}
.kind{display:inline-block;font-size:.75rem;font-weight:700;padding:2px 8px;border-radius:6px;margin-right:6px;background:var(--secondary)}
.kind.entnahme{color:var(--danger)}.kind.auffuellen{color:var(--ok)}.kind.korrektur{color:var(--warn)}
select{width:auto;min-width:180px}

/* ---------- Admin */
.subnav{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}
.subnav a{padding:6px 12px;border:1px solid var(--border);border-radius:999px;text-decoration:none;font-size:.9rem;background:var(--card)}
section{margin-bottom:28px;scroll-margin-top:70px}
details>summary{cursor:pointer;padding:2px 0;display:flex;align-items:center;gap:6px;list-style:none}
details>summary::-webkit-details-marker{display:none}
details>summary .muted{margin-left:auto;font-variant-numeric:tabular-nums}
details[open]>summary{margin-bottom:12px}
.form-grid{display:grid;gap:0 14px;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));align-items:end}
.form-grid .full{grid-column:1/-1}
.form-grid>button{margin-bottom:10px}
details form+form{margin-top:4px}

@media (max-width:520px){
  main{padding:12px}
  .topbar{padding:8px 12px}
  .topbar nav a span,.navbtn span{display:none}
  .topbar nav a,.navbtn{padding:9px 11px}
  .readout .big{font-size:2.5rem}
}
.tankcard.st-empty .readout .big small{color:var(--danger)}