/* =============================================================================
   Leo Book Shop - POS System
   Hand-written responsive stylesheet (no CSS framework).
   ============================================================================= */

:root {
    --bg:          #0f172a;   /* page background (deep slate) */
    --surface:     #ffffff;
    --surface-2:   #f1f5f9;
    --ink:         #0f172a;
    --ink-soft:    #475569;
    --muted:       #94a3b8;
    --border:      #e2e8f0;

    --brand:       #1d4ed8;
    --brand-dark:  #1e3a8a;
    --accent:      #0891b2;
    --success:     #16a34a;
    --success-bg:  #dcfce7;
    --danger:      #dc2626;
    --danger-bg:   #fee2e2;
    --warning:     #d97706;
    --warning-bg:  #fef3c7;
    --cash:        #16a34a;
    --card:        #2563eb;

    --radius:      14px;
    --radius-sm:   9px;
    --shadow:      0 1px 2px rgba(15, 23, 42, .06), 0 8px 24px rgba(15, 23, 42, .06);
    --shadow-soft: 0 1px 3px rgba(15, 23, 42, .08);
    --sidebar-w:   248px;
    --font:        system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

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

body {
    font-family: var(--font);
    color: var(--ink);
    background: var(--surface-2);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3 { margin: 0 0 .25rem; line-height: 1.25; }

/* ---------------------------------------------------------------------------
   App shell: sidebar + main column
   ------------------------------------------------------------------------- */
.layout { display: flex; min-height: 100vh; }

.sidebar {
    width: var(--sidebar-w);
    flex: 0 0 var(--sidebar-w);
    background: linear-gradient(180deg, var(--brand-dark), #0b1f4d);
    color: #e2e8f0;
    display: flex;
    flex-direction: column;
    padding: 1.25rem 1rem;
    position: sticky;
    top: 0;
    height: 100vh;
}

.brand { display: flex; align-items: center; gap: .7rem; padding: .25rem .25rem 1.25rem; }
.brand-mark { font-size: 1.7rem; line-height: 1; }
.brand-text { display: flex; flex-direction: column; }
.brand-text strong { font-size: 1.05rem; color: #fff; }
.brand-text small { color: #acc0e6; font-size: .72rem; }

.nav { display: flex; flex-direction: column; gap: .25rem; margin-top: .5rem; }
.nav-link {
    display: flex; align-items: center; gap: .75rem;
    padding: .6rem .75rem;
    border-radius: var(--radius-sm);
    color: #cbd5e1;
    font-weight: 500;
    transition: background .15s, color .15s;
}
.nav-link:hover { background: rgba(255,255,255,.08); color: #fff; text-decoration: none; }
.nav-link.is-active { background: rgba(255,255,255,.16); color: #fff; }
.nav-icon { width: 1.25rem; text-align: center; }

.sidebar-foot { margin-top: auto; padding-top: 1rem; border-top: 1px solid rgba(255,255,255,.12); }

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

/* ---------------------------------------------------------------------------
   Top bar
   ------------------------------------------------------------------------- */
.topbar {
    display: flex; align-items: center; gap: 1rem;
    padding: .9rem 1.5rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 20;
}
.page-title { font-size: 1.25rem; margin: 0; }
.menu-toggle {
    display: none; border: 0; background: transparent;
    font-size: 1.4rem; cursor: pointer; color: var(--ink);
}
.user-chip { display: flex; align-items: center; gap: .6rem; margin-left: auto; }
.user-avatar {
    width: 2.2rem; height: 2.2rem; border-radius: 50%;
    background: var(--brand); color: #fff;
    display: grid; place-items: center; font-weight: 700;
}
.user-meta { display: flex; flex-direction: column; line-height: 1.15; }
.user-meta small { color: var(--muted); font-size: .72rem; }

.content { padding: 1.5rem; flex: 1 1 auto; }

.page-foot {
    display: flex; justify-content: space-between; flex-wrap: wrap; gap: .5rem;
    padding: 1rem 1.5rem; color: var(--muted); font-size: .8rem;
    border-top: 1px solid var(--border); background: var(--surface);
}

/* ---------------------------------------------------------------------------
   Generic building blocks
   ------------------------------------------------------------------------- */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-soft);
    padding: 1.25rem;
}
.card + .card { margin-top: 1.25rem; }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; flex-wrap: wrap; }
.card-head h2 { font-size: 1.05rem; }
.card-sub { color: var(--muted); font-size: .85rem; }

.grid { display: grid; gap: 1.25rem; }
.section-gap { margin-top: 1.25rem; }

/* Stat cards */
.stats { display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }
.stat {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.1rem 1.2rem;
    box-shadow: var(--shadow-soft);
    position: relative;
    overflow: hidden;
}
.stat::before {
    content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
    background: var(--brand);
}
.stat.is-cash::before    { background: var(--cash); }
.stat.is-card::before    { background: var(--card); }
.stat.is-expense::before { background: var(--danger); }
.stat.is-profit::before  { background: var(--accent); }
.stat.is-pending::before { background: var(--warning); }
.stat.is-overdue::before { background: var(--danger); }
.stat-label { color: var(--ink-soft); font-size: .82rem; font-weight: 600; text-transform: uppercase; letter-spacing: .03em; }
.stat-value { font-size: 1.6rem; font-weight: 700; margin-top: .35rem; }
.stat-note { color: var(--muted); font-size: .78rem; margin-top: .25rem; }
.stat-value.neg { color: var(--danger); }
.stat-value.pos { color: var(--success); }

/* Two-column responsive layout for charts */
.cols-2 { display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }

/* Chart wrappers keep canvases at a sensible height */
.chart-box { position: relative; height: 300px; }
.chart-box.tall { height: 340px; }

/* ---------------------------------------------------------------------------
   Tables
   ------------------------------------------------------------------------- */
.table-wrap { overflow-x: auto; }
table.data {
    width: 100%; border-collapse: collapse; font-size: .9rem;
}
table.data th, table.data td {
    padding: .65rem .75rem; text-align: left; border-bottom: 1px solid var(--border);
    white-space: nowrap;
}
table.data th {
    font-size: .75rem; text-transform: uppercase; letter-spacing: .03em;
    color: var(--ink-soft); background: var(--surface-2);
}
table.data tbody tr:hover { background: #f8fafc; }
table.data td.num, table.data th.num { text-align: right; font-variant-numeric: tabular-nums; }
table.data tfoot td { font-weight: 700; border-top: 2px solid var(--border); }
.empty-row td { text-align: center; color: var(--muted); padding: 2rem; }

/* Badges */
.badge {
    display: inline-block; padding: .15rem .55rem; border-radius: 999px;
    font-size: .73rem; font-weight: 600;
}
.badge-cash      { background: var(--success-bg); color: #166534; }
.badge-card      { background: #dbeafe; color: #1e40af; }
.badge-cat       { background: var(--surface-2); color: var(--ink-soft); }
.badge-pending   { background: #fef9c3; color: #854d0e; }
.badge-overdue   { background: var(--danger-bg);  color: #991b1b; }
.badge-cleared   { background: var(--success-bg); color: #166534; }
.badge-bounced   { background: var(--danger-bg);  color: #991b1b; }
.badge-cancelled { background: var(--surface-2);  color: var(--ink-soft); }

/* ---------------------------------------------------------------------------
   Forms
   ------------------------------------------------------------------------- */
.form-grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.field { display: flex; flex-direction: column; gap: .35rem; }
.field label { font-size: .82rem; font-weight: 600; color: var(--ink-soft); }
.field input, .field select, .field textarea {
    font: inherit; padding: .55rem .7rem;
    border: 1px solid #cbd5e1; border-radius: var(--radius-sm);
    background: #fff; color: var(--ink); width: 100%;
}
.field input:focus, .field select:focus, .field textarea:focus {
    outline: none; border-color: var(--brand);
    box-shadow: 0 0 0 3px rgba(29, 78, 216, .15);
}
.form-actions { display: flex; gap: .75rem; align-items: flex-end; }

.btn {
    display: inline-flex; align-items: center; gap: .45rem; justify-content: center;
    font: inherit; font-weight: 600; cursor: pointer;
    padding: .58rem 1.1rem; border-radius: var(--radius-sm);
    border: 1px solid transparent; background: var(--brand); color: #fff;
    transition: background .15s, transform .05s;
    text-decoration: none;
}
.btn:hover { background: var(--brand-dark); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn-ghost { background: #fff; color: var(--ink); border-color: #cbd5e1; }
.btn-ghost:hover { background: var(--surface-2); }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #b91c1c; }
.btn-sm { padding: .35rem .7rem; font-size: .8rem; }
.btn-block { width: 100%; }

/* Filter / toolbar row */
.toolbar {
    display: flex; flex-wrap: wrap; gap: .75rem; align-items: flex-end;
    margin-bottom: 1.25rem;
}
.toolbar .field { min-width: 150px; }

/* ---------------------------------------------------------------------------
   Alerts
   ------------------------------------------------------------------------- */
.alert {
    padding: .75rem 1rem; border-radius: var(--radius-sm);
    margin-bottom: 1rem; font-weight: 500; border: 1px solid transparent;
}
.alert-success { background: var(--success-bg); color: #166534; border-color: #bbf7d0; }
.alert-error   { background: var(--danger-bg);  color: #991b1b; border-color: #fecaca; }
.alert-info    { background: #e0f2fe; color: #075985; border-color: #bae6fd; }
.alert-warning { background: var(--warning-bg); color: #92400e; border-color: #fde68a; }

/* ---------------------------------------------------------------------------
   Login screen
   ------------------------------------------------------------------------- */
.auth {
    min-height: 100vh; display: grid; place-items: center;
    background: radial-gradient(1200px 600px at 20% -10%, #1e3a8a, var(--bg));
    padding: 1.5rem;
}
.auth-card {
    width: 100%; max-width: 400px; background: var(--surface);
    border-radius: var(--radius); box-shadow: var(--shadow); padding: 2rem;
}
.auth-brand { text-align: center; margin-bottom: 1.5rem; }
.auth-brand .mark { font-size: 2.4rem; }
.auth-brand h1 { font-size: 1.4rem; margin-top: .5rem; }
.auth-brand p { color: var(--muted); font-size: .85rem; margin: .25rem 0 0; }
.auth-card .field { margin-bottom: 1rem; }
.auth-hint { margin-top: 1.25rem; font-size: .78rem; color: var(--muted); text-align: center; }

.legend { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: .75rem; font-size: .82rem; color: var(--ink-soft); }
.legend span { display: inline-flex; align-items: center; gap: .4rem; }
.dot { width: .7rem; height: .7rem; border-radius: 50%; display: inline-block; }

/* ---------------------------------------------------------------------------
   End-of-day cash count
   ------------------------------------------------------------------------- */
.reconcile-box {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}
.reconcile-row {
    display: flex; justify-content: space-between; align-items: center;
    padding: .6rem .85rem;
    font-size: .9rem;
    border-bottom: 1px solid var(--border);
}
.reconcile-row:last-child { border-bottom: none; }
.reconcile-row small { color: var(--muted); font-size: .75rem; margin-left: .2rem; }
.reconcile-variance {
    background: var(--surface-2);
    font-weight: 600;
}
.variance-zero { color: var(--success); }
.variance-over { color: var(--warning); }
.neg           { color: var(--danger);  }

/* ---------------------------------------------------------------------------
   Cheque calendar
   ------------------------------------------------------------------------- */
.cal-nav {
    display: flex; align-items: center; justify-content: space-between; gap: 1rem;
    margin-bottom: 1rem; flex-wrap: wrap;
}
.cal-nav h2 { font-size: 1.1rem; margin: 0; }

.cal {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.cal-hdr {
    background: var(--surface-2);
    text-align: center;
    padding: .45rem .25rem;
    font-size: .72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--ink-soft);
}

.cal-day {
    background: var(--surface);
    min-height: 82px;
    padding: .35rem .4rem;
}
.cal-day.cal-empty   { background: var(--surface-2); }
.cal-day.cal-today   { background: #eff6ff; }

.cal-day-num {
    display: inline-flex; align-items: center; justify-content: center;
    width: 1.5rem; height: 1.5rem; border-radius: 50%;
    font-size: .78rem; font-weight: 700; color: var(--ink-soft);
    margin-bottom: .25rem;
}
.cal-today .cal-day-num { background: var(--brand); color: #fff; }

.cal-chip {
    display: block;
    padding: .1rem .3rem;
    border-radius: 3px;
    font-size: .63rem;
    font-weight: 600;
    margin-bottom: .15rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.45;
    border-left: 2px solid transparent;
    cursor: default;
}
.cal-chip-pending   { background: #fef9c3; color: #854d0e; border-left-color: #ca8a04; }
.cal-chip-overdue   { background: var(--danger-bg);  color: #991b1b; border-left-color: var(--danger); }
.cal-chip-cleared   { background: var(--success-bg); color: #166534; border-left-color: var(--success); }
.cal-chip-bounced   { background: var(--danger-bg);  color: #991b1b; border-left-color: var(--danger); }
.cal-chip-cancelled { background: var(--surface-2);  color: var(--muted); border-left-color: var(--border); }

@media (max-width: 700px) {
    .cal-day { min-height: 56px; padding: .2rem; }
    .cal-chip { display: none; }
    .cal-day-num { font-size: .7rem; }
}

/* ---------------------------------------------------------------------------
   Responsive behaviour
   ------------------------------------------------------------------------- */
@media (max-width: 860px) {
    .sidebar {
        position: fixed; left: 0; top: 0; z-index: 40;
        transform: translateX(-100%); transition: transform .2s ease;
        box-shadow: 0 0 40px rgba(0,0,0,.4);
    }
    .sidebar.open { transform: translateX(0); }
    .menu-toggle { display: inline-block; }
    .content { padding: 1rem; }
}

@media print {
    .sidebar, .topbar, .page-foot, .toolbar, .btn, .menu-toggle { display: none !important; }
    body { background: #fff; }
    .card { box-shadow: none; border-color: #ddd; }
}