:root{
  --bg:#EEF0EA;
  --surface:#FFFFFF;
  --surface-2:#E4E7DE;
  --ink:#1F2D2A;
  --ink-soft:#4B5A54;
  --muted:#7C877F;
  --line:#C9CFC2;
  --accent-debit:#2B4C6F;
  --accent-debit-bg:#E4EAF0;
  --accent-credit:#24604F;
  --accent-credit-bg:#E1EBE6;
  --error:#8C3B2E;
  --error-bg:#F3E4DF;
  --font-display:'Fraunces', serif;
  --font-body:'IBM Plex Sans', system-ui, sans-serif;
  --font-mono:'IBM Plex Mono', monospace;
  --radius:6px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto;} *{animation-duration:.001ms !important; transition-duration:.001ms !important;}}

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-body);
  line-height:1.6;
  background-image:repeating-linear-gradient(to bottom, rgba(31,45,42,0.035) 0px, rgba(31,45,42,0.035) 1px, transparent 1px, transparent 34px);
}

.wrap{max-width:1080px;margin:0 auto;padding:0 24px;}

a{color:inherit;}

/* header */
.site-header{background:var(--ink);color:var(--bg);}
.header-inner{display:flex;justify-content:space-between;align-items:flex-end;padding:28px 24px 18px;flex-wrap:wrap;gap:12px;}
.eyebrow{display:block;font-family:var(--font-mono);font-size:12px;letter-spacing:0.08em;text-transform:uppercase;color:#9FB0A8;margin-bottom:4px;}
.wordmark h1{font-family:var(--font-display);font-weight:600;font-size:34px;margin:0;letter-spacing:-0.01em;}
.header-nav{display:flex;gap:22px;align-items:center;font-size:14px;}
.header-nav a{text-decoration:none;color:#D7DED9;border-bottom:1px solid transparent;padding-bottom:2px;}
.header-nav a:hover, .header-nav a:focus-visible{border-color:#D7DED9;}
.gh-link{color:#EFEAD9 !important;}
.ledger-rule{height:6px;background:repeating-linear-gradient(90deg, var(--accent-credit) 0 18px, transparent 18px 26px);opacity:.55;}

/* intro */
.intro{padding:34px 24px 8px;}
.intro-text{max-width:620px;color:var(--ink-soft);font-size:16px;margin:0 0 20px;}
.stat-row{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:8px;}
.stat-chip{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:10px 16px;display:flex;flex-direction:column;min-width:110px;}
.stat-num{font-family:var(--font-mono);font-size:20px;font-weight:500;}
.stat-label{font-size:12px;color:var(--muted);}

/* tool section */
.tool-section{padding:28px 24px 60px;}
.tool-controls{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:14px;margin-bottom:20px;}
.category-picker{display:flex;gap:8px;flex-wrap:wrap;}
.cat-btn{font-family:var(--font-body);font-size:14px;padding:8px 14px;border-radius:var(--radius);border:1px solid var(--line);background:var(--surface);color:var(--ink-soft);cursor:pointer;}
.cat-btn:hover{border-color:var(--accent-credit);}
.cat-btn.is-active{background:var(--ink);color:var(--bg);border-color:var(--ink);}
.bilanz-toggle{font-size:14px;color:var(--ink-soft);display:flex;gap:8px;align-items:center;cursor:pointer;}

.tool-grid{display:grid;grid-template-columns:1.35fr 1fr;gap:24px;align-items:start;}
@media (max-width:820px){.tool-grid{grid-template-columns:1fr;}}

.case-panel{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:22px 24px;}
.case-meta{display:flex;justify-content:space-between;font-size:13px;color:var(--muted);margin-bottom:12px;font-family:var(--font-mono);}
.case-card{background:var(--surface-2);border-radius:var(--radius);padding:16px 18px;margin-bottom:20px;min-height:64px;display:flex;align-items:center;}
#case-text{margin:0;font-size:16px;}

/* T-account form */
.t-account{display:flex;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin-bottom:16px;}
.t-side{flex:1;padding:14px 16px;display:flex;flex-direction:column;gap:10px;}
.t-side[data-side="soll"]{background:var(--accent-debit-bg);}
.t-side[data-side="haben"]{background:var(--accent-credit-bg);}
.t-side-label{font-family:var(--font-mono);font-size:12px;text-transform:uppercase;letter-spacing:.06em;font-weight:500;}
.t-side[data-side="soll"] .t-side-label{color:var(--accent-debit);}
.t-side[data-side="haben"] .t-side-label{color:var(--accent-credit);}
.t-divider{width:2px;background:var(--ink);opacity:.7;}

.posting-row{display:flex;gap:8px;margin-bottom:4px;flex-wrap:wrap;}
.posting-row select{flex:1.3;min-width:140px;}
.posting-row input{flex:1;min-width:90px;font-family:var(--font-mono);}

select, input[type="number"]{
  font-family:var(--font-body);
  font-size:14px;
  padding:8px 10px;
  min-height:40px;
  border-radius:4px;
  border:1px solid var(--line);
  background:var(--surface);
  color:var(--ink);
  max-width:100%;
}
select{text-overflow:ellipsis;}
.btn-primary, .btn-secondary, .cat-btn{min-height:40px;}
select:focus-visible, input:focus-visible, button:focus-visible{outline:2px solid var(--accent-credit);outline-offset:2px;}

.add-row-btn{align-self:flex-start;background:none;border:none;font-size:12px;color:var(--ink-soft);cursor:pointer;padding:2px 0;text-decoration:underline;}

.form-actions{display:flex;gap:10px;flex-wrap:wrap;}
button{font-family:var(--font-body);cursor:pointer;}
.btn-primary{background:var(--ink);color:var(--bg);border:1px solid var(--ink);padding:10px 18px;border-radius:var(--radius);font-size:14px;font-weight:500;}
.btn-primary:hover{background:var(--accent-credit);border-color:var(--accent-credit);}
.btn-secondary{background:var(--surface);color:var(--ink);border:1px solid var(--line);padding:10px 18px;border-radius:var(--radius);font-size:14px;}
.btn-secondary:disabled{opacity:.4;cursor:not-allowed;}

.feedback{margin-top:14px;font-size:14px;padding:10px 14px;border-radius:var(--radius);display:none;}
.feedback.is-correct{display:block;background:var(--accent-credit-bg);color:var(--accent-credit);}
.feedback.is-wrong{display:block;background:var(--error-bg);color:var(--error);}

/* bilanz panel */
.bilanz-panel{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:20px 22px;}
.bilanz-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;}
.bilanz-header h2{font-family:var(--font-display);font-weight:600;font-size:19px;margin:0;}
.reset-link{background:none;border:none;font-size:12px;color:var(--muted);text-decoration:underline;padding:0;}
.bilanz-columns{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.bilanz-col-label{font-family:var(--font-mono);font-size:12px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);border-bottom:1px solid var(--line);padding-bottom:6px;margin:0 0 8px;}
.bilanz-row{display:flex;justify-content:space-between;font-size:13px;padding:3px 0;color:var(--ink-soft);}
.bilanz-row span:last-child{font-family:var(--font-mono);color:var(--ink);}
.bilanz-total{display:flex;justify-content:space-between;margin-top:14px;padding-top:10px;border-top:2px solid var(--ink);font-family:var(--font-mono);font-size:14px;font-weight:500;}
.balance-check{font-size:12px;margin:10px 0 0;color:var(--muted);}
.balance-check.ok{color:var(--accent-credit);}
.balance-check.off{color:var(--error);}
#bilanz-panel.is-hidden{display:none;}

/* about + footer */
.about{padding:10px 24px 50px;max-width:720px;}
.about h2{font-family:var(--font-display);font-weight:600;}
.about p{color:var(--ink-soft);}

/* mobile */
@media (max-width:600px){
  .wrap{padding:0 16px;}
  .header-inner{padding:20px 16px 14px;align-items:flex-start;flex-direction:column;}
  .wordmark h1{font-size:26px;}
  .header-nav{gap:16px;font-size:13px;}
  .intro{padding:24px 16px 4px;}
  .intro-text{font-size:15px;}
  .stat-chip{min-width:0;flex:1;padding:8px 12px;}
  .tool-section{padding:20px 16px 48px;}
  .tool-controls{flex-direction:column;align-items:flex-start;gap:12px;}
  .case-panel, .bilanz-panel{padding:16px;}
  .case-meta{flex-direction:column;gap:4px;}
  .t-account{flex-direction:column;}
  .t-divider{width:100%;height:2px;}
  .posting-row{flex-direction:column;align-items:stretch;}
  .posting-row select, .posting-row input{width:100%;min-width:0;}
  .form-actions{flex-direction:column;}
  .form-actions button{width:100%;}
  .bilanz-panel{padding:14px;}
  .bilanz-header h2{font-size:16px;}
  .bilanz-columns{grid-template-columns:1fr;gap:14px;}
  .bilanz-col-label{font-size:11px;padding-bottom:4px;margin-bottom:6px;}
  .bilanz-row{font-size:12px;padding:2px 0;}
  .bilanz-total{font-size:13px;margin-top:10px;padding-top:8px;}
  .balance-check{font-size:11px;}
  .legal-page{padding:28px 16px 48px;}
  .footer-inner{flex-direction:column;align-items:flex-start;}
}

/* legal page (Impressum) */
.legal-page{padding:40px 24px 60px;max-width:680px;}
.legal-title{font-family:var(--font-display);font-weight:600;font-size:30px;margin:0 0 24px;}
.legal-section{margin-bottom:26px;}
.legal-section h2{font-family:var(--font-body);font-weight:600;font-size:15px;text-transform:uppercase;letter-spacing:.04em;color:var(--ink-soft);margin:0 0 8px;}
.legal-section p{margin:0;color:var(--ink);}
.site-footer{border-top:1px solid var(--line);padding:20px 0 40px;}
.footer-inner{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;font-size:13px;color:var(--muted);}
.footer-inner a{text-decoration:underline;}