:root{--color-bg: #f5f4f2;--color-surface: #ffffff;--color-border: #e4e1dc;--color-text: #22201d;--color-text-muted: #77726a;--color-primary: #2f4f3f;--color-primary-dark: #1f362a;--color-danger: #b23b3b;--color-warning: #b8862c;--color-success: #2f7a4f;--radius: 8px;--shadow: 0 1px 2px rgba(0, 0, 0, .06), 0 1px 6px rgba(0, 0, 0, .04)}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--color-bg);color:var(--color-text)}h1,h2{font-weight:600;margin:0 0 16px}h1{font-size:22px}h2{font-size:16px;margin-top:32px}.app-shell{display:flex;min-height:100vh}.sidebar{width:230px;background:var(--color-primary-dark);color:#f2f0ec;display:flex;flex-direction:column;padding:24px 16px;flex-shrink:0}.sidebar-brand{font-weight:700;font-size:16px}.sidebar-subtitle{font-size:12px;opacity:.7;margin-bottom:24px}.nav-link{display:block;padding:10px 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10px;border-radius:999px;font-size:11px;font-weight:600}.badge-offen{background:#eee7d8;color:#8a6d1e}.badge-teilweise_bezahlt{background:#dbe8f5;color:#2c5a87}.badge-bezahlt{background:#dcefe1;color:var(--color-success)}.badge-in_mahnung{background:#f5dede;color:var(--color-danger)}.badge-versendet{background:#dcefe1;color:var(--color-success)}.badge-fehler{background:#f5dede;color:var(--color-danger)}.badge-storniert{background:#efece7;color:var(--color-text-muted)}.badge-freigegeben,.badge-entwurf{background:#eee7d8;color:#8a6d1e}.tab-bar{display:flex;gap:4px;border-bottom:1px solid var(--color-border);margin-bottom:20px}.tab-button{background:none;border:none;border-bottom:2px solid transparent;padding:10px 4px;margin-right:20px;font-size:14px;font-weight:500;color:var(--color-text-muted);cursor:pointer}.tab-button.active{color:var(--color-primary);border-bottom-color:var(--color-primary)}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--color-primary-dark)}.login-card{background:var(--color-surface);padding:40px;border-radius:12px;width:340px;display:flex;flex-direction:column;gap:12px;box-shadow:0 10px 40px #0000004d}.login-card h1{font-size:18px;margin-bottom:0}.login-subtitle{color:var(--color-text-muted);font-size:13px;margin:0 0 12px}.login-card label{display:flex;flex-direction:column;font-size:13px;gap:4px}.login-card input,.detail-grid input,textarea{padding:9px 10px;border-radius:var(--radius);border:1px solid 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