:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --ink: #16202a;
  --ink-2: #5a6b7b;
  --ink-3: #8b9aa8;
  --line: #e2e8ee;
  --brand: #0f766e;
  --brand-dark: #0b5c56;
  --brand-soft: #e6f4f2;
  --danger: #c0392b;
  --danger-soft: #fdecea;
  --warn: #b45309;
  --warn-soft: #fdf3e3;
  --ok: #15803d;
  --ok-soft: #e8f6ec;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 32, 42, .06), 0 6px 20px rgba(16, 32, 42, .06);
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ------------------------------------------------------------------ layout */

.layout { display: flex; min-height: 100vh; }

.sidebar {
  width: 250px; flex: 0 0 250px;
  background: #0d1b26; color: #cfdae3;
  display: flex; flex-direction: column;
  position: sticky; top: 0; height: 100vh;
}

.brand { display: flex; gap: 11px; align-items: center; padding: 18px 18px 16px; border-bottom: 1px solid rgba(255,255,255,.08); }
.brand-mark {
  width: 38px; height: 38px; flex: 0 0 38px; border-radius: 9px;
  background: var(--brand); color: #fff; font-weight: 700; font-size: 19px;
  display: grid; place-items: center;
}
.brand-text { min-width: 0; }
.brand-text strong { display: block; color: #fff; font-size: 13.5px; line-height: 1.25; overflow: hidden; text-overflow: ellipsis; }
.brand-text span { display: block; font-size: 11px; color: #7d8fa0; margin-top: 2px; }

.sidebar nav { padding: 12px 10px; flex: 1; overflow-y: auto; }
.sidebar nav a {
  display: flex; align-items: center; gap: 11px;
  padding: 10px 12px; border-radius: 8px; margin-bottom: 2px;
  color: #b9c7d3; font-size: 14.5px; font-weight: 500; text-decoration: none;
}
.sidebar nav a svg { width: 18px; height: 18px; flex: 0 0 18px; opacity: .8; }
.sidebar nav a:hover { background: rgba(255,255,255,.06); color: #fff; text-decoration: none; }
.sidebar nav a.active { background: var(--brand); color: #fff; }
.sidebar nav a.active svg { opacity: 1; }

.sidebar-foot { padding: 14px 18px; border-top: 1px solid rgba(255,255,255,.08); }
.who span { display: block; color: #fff; font-size: 13.5px; font-weight: 600; }
.who small { color: #7d8fa0; font-size: 11.5px; }
.logout { display: inline-block; margin-top: 8px; font-size: 12.5px; color: #8fb8b3; }

.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }

.topbar {
  background: var(--panel); border-bottom: 1px solid var(--line);
  padding: 0 26px; height: 62px; display: flex; align-items: center; gap: 14px;
  position: sticky; top: 0; z-index: 20;
}
.topbar h1 { font-size: 19px; margin: 0; font-weight: 650; letter-spacing: -.2px; }
.topbar-actions { margin-left: auto; display: flex; gap: 8px; align-items: center; }
.burger { display: none; background: none; border: 0; padding: 6px; cursor: pointer; color: var(--ink); }
.burger svg { width: 22px; height: 22px; }

.content { padding: 22px 26px 40px; flex: 1; }
.foot { padding: 14px 26px 22px; color: var(--ink-3); font-size: 12.5px; }

/* ------------------------------------------------------------------- cards */

.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.card + .card { margin-top: 18px; }
.card-head { padding: 15px 18px; border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.card-head h2 { margin: 0; font-size: 15px; font-weight: 650; }
.card-head .spacer { margin-left: auto; }
.card-body { padding: 18px; }
.card-body.tight { padding: 0; }

.grid { display: grid; gap: 16px; }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }

.stat { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; box-shadow: var(--shadow); }
.stat .label { color: var(--ink-2); font-size: 12.5px; font-weight: 600; text-transform: uppercase; letter-spacing: .5px; }
.stat .value { font-size: 25px; font-weight: 680; margin-top: 7px; letter-spacing: -.5px; }
.stat .sub { color: var(--ink-3); font-size: 12.5px; margin-top: 3px; }

/* ------------------------------------------------------------------ tables */

.table-wrap { overflow-x: auto; }
table.data { width: 100%; border-collapse: collapse; font-size: 14px; }
table.data th {
  text-align: left; padding: 11px 14px; background: #f8fafb; color: var(--ink-2);
  font-size: 11.5px; font-weight: 700; text-transform: uppercase; letter-spacing: .6px;
  border-bottom: 1px solid var(--line); white-space: nowrap;
}
table.data td { padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: middle; }
table.data tbody tr:hover { background: #fafcfc; }
table.data tbody tr:last-child td { border-bottom: 0; }
table.data td.num, table.data th.num { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
table.data td.actions { text-align: right; white-space: nowrap; }
.muted { color: var(--ink-3); }
.strong { font-weight: 620; }
.empty { padding: 44px 18px; text-align: center; color: var(--ink-3); }

/* ------------------------------------------------------------------ inputs */

.field { margin-bottom: 14px; }
.field label { display: block; font-size: 12.5px; font-weight: 650; color: var(--ink-2); margin-bottom: 5px; }
.field .hint { font-size: 12px; color: var(--ink-3); margin-top: 4px; }

input[type=text], input[type=password], input[type=number], input[type=date],
input[type=email], input[type=search], select, textarea {
  width: 100%; padding: 9px 11px; border: 1px solid #cfd8e0; border-radius: 8px;
  font: inherit; font-size: 14px; background: #fff; color: var(--ink);
}
input:focus, select:focus, textarea:focus {
  outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(15,118,110,.13);
}
input[readonly] { background: #f4f6f8; color: var(--ink-2); }
textarea { resize: vertical; min-height: 70px; }
select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8'%3E%3Cpath fill='%23667' d='M1 1l5 5 5-5'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 10px center; background-size: 11px; padding-right: 30px; }

.row { display: grid; gap: 14px; }
.row.c2 { grid-template-columns: 1fr 1fr; }
.row.c3 { grid-template-columns: repeat(3, 1fr); }
.row.c4 { grid-template-columns: repeat(4, 1fr); }

/* ----------------------------------------------------------------- buttons */

.btn {
  display: inline-flex; align-items: center; gap: 7px; justify-content: center;
  padding: 9px 15px; border-radius: 8px; border: 1px solid transparent;
  background: var(--brand); color: #fff; font: inherit; font-size: 14px; font-weight: 600;
  cursor: pointer; text-decoration: none; white-space: nowrap;
}
.btn:hover { background: var(--brand-dark); text-decoration: none; color: #fff; }
.btn svg { width: 16px; height: 16px; }
.btn.ghost { background: #fff; color: var(--ink); border-color: #cfd8e0; }
.btn.ghost:hover { background: #f5f8fa; color: var(--ink); }
.btn.danger { background: var(--danger); }
.btn.danger:hover { background: #a5301f; }
.btn.sm { padding: 6px 11px; font-size: 13px; border-radius: 7px; }
.btn.link { background: none; border: 0; color: var(--brand); padding: 4px 6px; font-weight: 600; }
.btn.link:hover { background: var(--brand-soft); }
.btn.link.del { color: var(--danger); }
.btn.link.del:hover { background: var(--danger-soft); }
.btn[disabled] { opacity: .55; pointer-events: none; }

/* ------------------------------------------------------------------ alerts */

.alert { padding: 11px 15px; border-radius: 9px; margin-bottom: 16px; font-size: 14px; border: 1px solid; }
.alert-success { background: var(--ok-soft); border-color: #bfe3ca; color: #14602f; }
.alert-error   { background: var(--danger-soft); border-color: #f3c6c0; color: #90271a; }
.alert-warning { background: var(--warn-soft); border-color: #f0dcb6; color: #8a4b08; }

.badge { display: inline-block; padding: 3px 9px; border-radius: 20px; font-size: 11.5px; font-weight: 700; letter-spacing: .3px; text-transform: uppercase; }
.badge.issued { background: var(--brand-soft); color: var(--brand-dark); }
.badge.paid { background: var(--ok-soft); color: var(--ok); }
.badge.draft { background: #eef1f4; color: var(--ink-2); }
.badge.cancelled { background: var(--danger-soft); color: var(--danger); }
.badge.igst { background: #ede9fe; color: #5b21b6; }
.badge.cgst { background: #e0f2fe; color: #075985; }

/* ---------------------------------------------------------------- toolbars */

.toolbar { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 16px; }
.toolbar .grow { flex: 1; min-width: 180px; }
.toolbar form { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; flex: 1; }

.pager { display: flex; gap: 6px; align-items: center; padding: 14px 18px; border-top: 1px solid var(--line); font-size: 13.5px; }
.pager a, .pager span { padding: 5px 11px; border-radius: 7px; border: 1px solid var(--line); color: var(--ink-2); }
.pager a:hover { background: #f5f8fa; text-decoration: none; }
.pager .cur { background: var(--brand); border-color: var(--brand); color: #fff; }
.pager .info { border: 0; margin-left: auto; color: var(--ink-3); }

/* ------------------------------------------------------------ invoice form */

table.items { width: 100%; border-collapse: collapse; font-size: 13.5px; }
table.items th { background: #f8fafb; padding: 9px 8px; font-size: 11px; text-transform: uppercase; letter-spacing: .5px; color: var(--ink-2); border-bottom: 1px solid var(--line); text-align: left; }
table.items td { padding: 6px; border-bottom: 1px solid var(--line); vertical-align: middle; }
table.items input, table.items select { padding: 7px 8px; font-size: 13.5px; }
table.items td.num input { text-align: right; }
table.items .rm { background: none; border: 0; color: var(--danger); cursor: pointer; font-size: 18px; line-height: 1; padding: 2px 7px; border-radius: 6px; }
table.items .rm:hover { background: var(--danger-soft); }

.totals { margin-left: auto; width: min(380px, 100%); font-size: 14px; }
.totals div { display: flex; justify-content: space-between; padding: 7px 0; }
.totals div.grand { border-top: 2px solid var(--ink); margin-top: 6px; padding-top: 10px; font-size: 17px; font-weight: 700; }
.totals span:last-child { font-variant-numeric: tabular-nums; }

.form-actions { display: flex; gap: 10px; align-items: center; padding: 16px 18px; border-top: 1px solid var(--line); background: #fbfcfd; border-radius: 0 0 var(--radius) var(--radius); }
.form-actions .spacer { margin-left: auto; }

.section-title { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .7px; color: var(--ink-3); margin: 0 0 12px; }

/* ------------------------------------------------------------------- login */

.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 24px;
  background: linear-gradient(135deg, #0d1b26 0%, #12333a 100%); }
.login-card { background: #fff; border-radius: 14px; padding: 32px 30px; width: 100%; max-width: 400px;
  box-shadow: 0 20px 60px rgba(0,0,0,.3); }
.login-card .brand-mark { width: 48px; height: 48px; border-radius: 12px; font-size: 24px; margin-bottom: 16px;
  background: var(--brand); color: #fff; font-weight: 700; display: grid; place-items: center; }
.login-card h1 { margin: 0 0 4px; font-size: 21px; }
.login-card p.sub { margin: 0 0 22px; color: var(--ink-2); font-size: 13.5px; }
.login-card .btn { width: 100%; padding: 11px; margin-top: 6px; }

/* ------------------------------------------------------- invoice preview/print */

.paper { background: #fff; max-width: 900px; margin: 0 auto; padding: 26px 30px; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.paper h2.doc-title { text-align: center; font-size: 17px; letter-spacing: 2px; text-transform: uppercase; margin: 16px 0; padding: 7px; border: 1px solid var(--ink); }
.paper .co-name { font-size: 21px; font-weight: 700; }
.paper table { width: 100%; border-collapse: collapse; }
.paper table.lines th, .paper table.lines td { border: 1px solid #93a2ae; padding: 6px 7px; font-size: 13px; }
.paper table.lines th { background: #eef2f5; font-size: 11.5px; text-transform: uppercase; letter-spacing: .4px; }
.paper .parties { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border: 1px solid #93a2ae; }
.paper .parties > div { padding: 9px 11px; font-size: 13px; }
.paper .parties > div + div { border-left: 1px solid #93a2ae; }
.paper .party-title { font-size: 11.5px; font-weight: 700; text-transform: uppercase; letter-spacing: .5px; color: var(--ink-2); margin-bottom: 5px; }

/* --------------------------------------------------------------- responsive */

@media (max-width: 980px) {
  .grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
  .grid.cols-3, .grid.cols-2 { grid-template-columns: 1fr; }
  .row.c3, .row.c4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 760px) {
  .sidebar { position: fixed; z-index: 60; left: -260px; transition: left .2s; box-shadow: 0 0 40px rgba(0,0,0,.4); }
  .sidebar.open { left: 0; }
  .burger { display: block; }
  .content, .topbar { padding-left: 15px; padding-right: 15px; }
  .grid.cols-4 { grid-template-columns: 1fr; }
  .row.c2, .row.c3, .row.c4 { grid-template-columns: 1fr; }
  .topbar h1 { font-size: 17px; }
}

@media print {
  .sidebar, .topbar, .foot, .no-print { display: none !important; }
  body { background: #fff; }
  .content { padding: 0; }
  .paper { border: 0; box-shadow: none; max-width: none; padding: 0; }
}