:root{
  --bg:#f4f6f9;--card:#fff;--ink:#1d2433;--muted:#6b7385;--line:#e3e7ee;
  --primary:#0f6e6e;--primary-ink:#fff;--primary-soft:#e3f2f1;
  --green:#1f8a4c;--green-soft:#e4f5ea;--red:#c0392b;--red-soft:#fbe9e7;
  --amber:#b7791f;--amber-soft:#fdf3e1;--blue:#2563eb;--blue-soft:#e7eefd;--purple:#7c3aed;--purple-soft:#f0e9fe;
  --radius:10px;--side:220px;
}
*{box-sizing:border-box}
html,body{margin:0}
body{font:14px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans Kannada",sans-serif;background:var(--bg);color:var(--ink)}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
h1{font-size:22px;margin:0 0 4px}
h2{font-size:17px;margin:0 0 12px}
h3{font-size:15px;margin:0 0 8px}
code{background:#eef1f5;padding:1px 5px;border-radius:4px}
.muted{color:var(--muted)}.small{font-size:12px}.right{text-align:right}.center{text-align:center}.nowrap{white-space:nowrap}
.red{color:var(--red)}.green{color:var(--green)}.bold{font-weight:600}

/* layout */
.topbar{position:fixed;top:0;left:0;right:0;height:56px;background:var(--card);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:12px;padding:0 16px;z-index:30}
.brand{font-weight:700;font-size:16px;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topbar-right{margin-left:auto;display:flex;gap:8px;align-items:center}
.menu-toggle{display:none;background:none;border:0;font-size:22px;cursor:pointer;color:var(--ink)}
.sidebar{position:fixed;top:56px;bottom:0;left:0;width:var(--side);background:var(--card);border-right:1px solid var(--line);padding:12px 8px;overflow-y:auto;z-index:20}
.sidebar a{display:flex;gap:10px;align-items:center;padding:9px 12px;border-radius:8px;color:var(--ink);margin-bottom:2px}
.sidebar a:hover{background:var(--bg);text-decoration:none}
.sidebar a.active{background:var(--primary-soft);color:var(--primary);font-weight:600}
.content{margin-left:var(--side);padding:76px 24px 40px;max-width:1300px}
.nav-backdrop{display:none}
@media (max-width:900px){
  .menu-toggle{display:block}
  .sidebar{transform:translateX(-100%);transition:transform .2s}
  body.nav-open .sidebar{transform:none}
  body.nav-open .nav-backdrop{display:block;position:fixed;inset:56px 0 0 0;background:rgba(0,0,0,.3);z-index:15}
  .content{margin-left:0;padding:72px 12px 32px}
  .topbar-right .muted{display:none}
}

/* page head */
.page-head{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;margin-bottom:16px}
.page-head .actions{display:flex;flex-wrap:wrap;gap:8px}

/* cards & grid */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;margin-bottom:16px}
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}.g3{grid-template-columns:repeat(3,minmax(0,1fr))}.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media (max-width:900px){.g3,.g4{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:600px){.g2,.g3,.g4{grid-template-columns:1fr}}
.stat{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px}
.stat .lbl{color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.04em}
.stat .val{font-size:22px;font-weight:700;margin-top:4px}
.stat .sub{font-size:12px;color:var(--muted)}
.kv{display:grid;grid-template-columns:140px 1fr;gap:6px 12px}
.kv dt{color:var(--muted)}.kv dd{margin:0}

/* forms */
label{display:block;font-size:12px;color:var(--muted);font-weight:600;margin-bottom:10px}
input,select,textarea{display:block;width:100%;margin-top:4px;padding:8px 10px;border:1px solid #cfd6e0;border-radius:8px;font:inherit;color:var(--ink);background:#fff}
input:focus,select:focus,textarea:focus{outline:2px solid var(--primary-soft);border-color:var(--primary)}
textarea{min-height:70px;resize:vertical}
input[type=checkbox],input[type=radio]{display:inline-block;width:auto;margin:0 6px 0 0;vertical-align:middle}
.check{display:flex;align-items:center;font-weight:500;color:var(--ink);font-size:14px}
.form-row{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(170px,1fr))}
.inline-form{display:flex;flex-wrap:wrap;gap:8px;align-items:flex-end}
.inline-form label{margin:0}
.inline-form input,.inline-form select{min-width:140px}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border-radius:8px;border:1px solid #cfd6e0;background:#fff;color:var(--ink);font:inherit;font-weight:600;cursor:pointer;white-space:nowrap}
.btn:hover{background:var(--bg);text-decoration:none}
.btn-primary{background:var(--primary);border-color:var(--primary);color:var(--primary-ink)}
.btn-primary:hover{background:#0c5a5a}
.btn-green{background:var(--green);border-color:var(--green);color:#fff}
.btn-wa{background:#25d366;border-color:#25d366;color:#fff}.btn-wa:hover{background:#1ebe5a}
.btn-danger{color:var(--red);border-color:#e9b8b2}
.btn-sm{padding:5px 10px;font-size:13px}
.btn-block{width:100%;justify-content:center}

/* tables */
.table-wrap{overflow-x:auto}
table.tbl{width:100%;border-collapse:collapse;background:var(--card)}
.tbl th,.tbl td{padding:9px 10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.tbl th{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.03em;background:#fafbfc}
.tbl tr:hover td{background:#fafcff}
.tbl td.num,.tbl th.num{text-align:right;white-space:nowrap}
.tbl tfoot td{font-weight:700;background:#fafbfc}

/* badges & alerts */
.badge{display:inline-block;padding:2px 9px;border-radius:99px;font-size:12px;font-weight:600;white-space:nowrap}
.badge-green{background:var(--green-soft);color:var(--green)}.badge-red{background:var(--red-soft);color:var(--red)}
.badge-amber{background:var(--amber-soft);color:var(--amber)}.badge-blue{background:var(--blue-soft);color:var(--blue)}
.badge-purple{background:var(--purple-soft);color:var(--purple)}.badge-grey{background:#eef0f3;color:#555}
.alert{padding:10px 14px;border-radius:8px;margin-bottom:14px;font-weight:500}
.alert-ok{background:var(--green-soft);color:var(--green)}.alert-err{background:var(--red-soft);color:var(--red)}.alert-warn{background:var(--amber-soft);color:var(--amber)}

.pager{display:flex;gap:16px;align-items:center;justify-content:center;padding:12px}
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:12px}
.tabs a{padding:6px 12px;border-radius:99px;background:var(--card);border:1px solid var(--line);color:var(--ink);font-size:13px}
.tabs a.active{background:var(--primary);border-color:var(--primary);color:#fff}
.timeline{list-style:none;margin:0;padding:0}
.timeline li{padding:8px 0 8px 18px;border-left:2px solid var(--line);position:relative}
.timeline li::before{content:"";position:absolute;left:-6px;top:13px;width:10px;height:10px;border-radius:50%;background:var(--primary)}

/* invoice editor */
.lines th,.lines td{padding:6px}
.lines input,.lines select{margin:0;padding:6px 8px}
.lines .c-desc{min-width:220px}.lines .c-sm{width:80px}.lines .c-md{width:105px}
.totals{max-width:360px;margin-left:auto}
.totals div{display:flex;justify-content:space-between;padding:4px 0}
.totals .grand{font-size:20px;font-weight:700;border-top:2px solid var(--ink);padding-top:8px;margin-top:6px}
.suggest{position:absolute;z-index:40;background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:0 8px 24px rgba(0,0,0,.12);max-height:260px;overflow:auto;min-width:280px}
.suggest div{padding:8px 10px;cursor:pointer;border-bottom:1px solid var(--line)}
.suggest div:hover,.suggest div.on{background:var(--primary-soft)}
.rel{position:relative}
.type-toggle{display:inline-flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.type-toggle label{margin:0;padding:8px 14px;cursor:pointer;color:var(--ink);font-size:14px}
.type-toggle input{display:none}
.type-toggle label:has(input:checked){background:var(--primary);color:#fff}

/* auth */
.auth-page{display:flex;min-height:100vh;align-items:center;justify-content:center;padding:16px}
.auth-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:28px;width:100%;max-width:380px;box-shadow:0 10px 30px rgba(0,0,0,.06)}
.brand-mark{font-size:36px}

@media print{.topbar,.sidebar,.no-print{display:none!important}.content{margin:0;padding:0}}

/* GST on/off switch */
.gst-switch{display:inline-flex;align-items:center;gap:10px;margin:0;padding:8px 14px;border:1px solid var(--line);border-radius:99px;background:var(--card);cursor:pointer;color:var(--ink);font-size:14px}
.gst-switch .sw-label{font-weight:800;letter-spacing:.04em}
.gst-switch .sw-state{font-weight:600;color:var(--primary);min-width:120px}
.gst-switch.off .sw-state{color:var(--muted)}
.switch{position:relative;display:inline-block;width:46px;height:26px;flex:none}
.switch input{opacity:0;width:0;height:0;position:absolute}
.switch .slider{position:absolute;inset:0;background:#c5ccd6;border-radius:99px;transition:.2s}
.switch .slider::before{content:"";position:absolute;width:20px;height:20px;left:3px;top:3px;background:#fff;border-radius:50%;box-shadow:0 1px 3px rgba(0,0,0,.25);transition:.2s}
.switch input:checked+.slider{background:var(--primary)}
.switch input:checked+.slider::before{transform:translateX(20px)}
.switch input:focus-visible+.slider{outline:2px solid var(--primary);outline-offset:2px}
.setting-switch{display:flex;align-items:flex-start;gap:12px;padding:12px 0;border-bottom:1px solid var(--line);margin:0;color:var(--ink);font-size:14px;font-weight:500;cursor:pointer}
.setting-switch small{display:block;color:var(--muted);font-weight:400;font-size:12px}
.logo-preview{max-height:64px;max-width:200px;border:1px solid var(--line);border-radius:6px;padding:4px;background:#fff}

.btn-bt{background:#2563eb;border-color:#2563eb;color:#fff}.btn-bt:hover{background:#1d4fd8}
.bt-banner{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.bt-banner .btn{font-size:16px;padding:10px 18px}