/* ============================================================
   ISP Billing System — Main Stylesheet
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary:       #2563eb;
  --primary-dark:  #1d4ed8;
  --primary-light: #dbeafe;
  --success:       #16a34a;
  --success-bg:    #dcfce7;
  --warning:       #d97706;
  --warning-bg:    #fef3c7;
  --danger:        #dc2626;
  --danger-bg:     #fee2e2;
  --info:          #0891b2;
  --info-bg:       #cffafe;
  --purple:        #7c3aed;
  --purple-bg:     #ede9fe;
  --teal:          #0d9488;
  --teal-bg:       #ccfbf1;

  --sidebar-w:     240px;
  --topbar-h:      60px;

  --gray-50:  #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;

  --radius:   8px;
  --shadow:   0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md:0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

body { font-family: var(--font); font-size: 14px; color: var(--gray-800); background: var(--gray-100); line-height: 1.5; }
a    { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
ul   { list-style: none; }

/* ── Login ──────────────────────────────── */
.login-body { background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%); min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 1rem; }
.login-wrapper { width: 100%; max-width: 420px; }
.login-card { background: #fff; border-radius: 12px; padding: 2.5rem 2rem; box-shadow: 0 20px 60px rgba(0,0,0,.3); }
.login-logo { text-align: center; margin-bottom: 1.5rem; }
.logo-icon { font-size: 2.5rem; }
.login-logo h1 { font-size: 1.3rem; font-weight: 700; color: var(--gray-800); margin-top: .5rem; }
.login-tabs { display: flex; gap: 4px; background: var(--gray-100); border-radius: var(--radius); padding: 4px; margin-bottom: 1.5rem; }
.tab-link { flex: 1; text-align: center; padding: .5rem; border-radius: 6px; font-weight: 600; color: var(--gray-500); transition: all .2s; }
.tab-link.active { background: #fff; color: var(--primary); box-shadow: var(--shadow); }
.tab-link:hover { text-decoration: none; color: var(--primary); }
.login-footer { text-align: center; color: var(--gray-400); font-size: .8rem; margin-top: 1.25rem; }

/* ── Layout ─────────────────────────────── */
.layout { display: flex; min-height: 100vh; }
.sidebar { width: var(--sidebar-w); background: var(--gray-900); color: #fff; position: fixed; top: 0; left: 0; height: 100vh; overflow-y: auto; z-index: 100; transition: transform .3s; }
.main-wrapper { margin-left: var(--sidebar-w); flex: 1; display: flex; flex-direction: column; min-height: 100vh; }

/* ── Sidebar ─────────────────────────────── */
.sidebar-brand { display: flex; align-items: center; gap: .75rem; padding: 1.25rem 1rem; border-bottom: 1px solid rgba(255,255,255,.08); }
.brand-icon { font-size: 1.4rem; }
.brand-text { font-weight: 700; font-size: .95rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sidebar-nav { padding: .75rem 0; }
.nav-section { padding: .75rem 1rem .25rem; font-size: .7rem; font-weight: 700; letter-spacing: .1em; color: var(--gray-500); text-transform: uppercase; }
.nav-item { display: flex; align-items: center; gap: .75rem; padding: .65rem 1rem; color: var(--gray-300); border-radius: 0; transition: background .15s, color .15s; white-space: nowrap; }
.nav-item:hover { background: rgba(255,255,255,.07); color: #fff; text-decoration: none; }
.nav-item.active { background: var(--primary); color: #fff; }
.nav-icon { width: 18px; text-align: center; flex-shrink: 0; }
.nav-logout { color: #fca5a5 !important; }
.nav-logout:hover { background: rgba(220,38,38,.2) !important; }

/* ── Topbar ──────────────────────────────── */
.topbar { height: var(--topbar-h); background: #fff; border-bottom: 1px solid var(--gray-200); display: flex; align-items: center; padding: 0 1.5rem; gap: 1rem; position: sticky; top: 0; z-index: 50; box-shadow: var(--shadow); }
.topbar-title { font-weight: 700; font-size: 1rem; color: var(--gray-800); flex: 1; }
.topbar-right { display: flex; align-items: center; gap: .75rem; }
.admin-name { font-size: .85rem; color: var(--gray-600); }
.admin-badge { background: var(--primary-light); color: var(--primary-dark); font-size: .7rem; font-weight: 700; padding: .2rem .5rem; border-radius: 20px; text-transform: uppercase; }
.sidebar-toggle { background: none; border: none; font-size: 1.3rem; cursor: pointer; color: var(--gray-600); display: none; padding: .25rem; }

/* ── Main Content ─────────────────────────── */
.content { flex: 1; padding: 1.5rem; max-width: 100%; }

/* ── Client Portal ───────────────────────── */
.client-body { background: var(--gray-100); }
.client-topbar { background: var(--gray-900); color: #fff; padding: 0 2rem; height: 60px; display: flex; align-items: center; gap: 2rem; position: sticky; top: 0; z-index: 100; }
.client-brand { font-weight: 700; font-size: 1rem; white-space: nowrap; margin-right: auto; }
.client-nav { display: flex; gap: .25rem; }
.client-nav a { color: var(--gray-300); padding: .5rem .85rem; border-radius: var(--radius); font-weight: 500; font-size: .88rem; transition: all .15s; }
.client-nav a:hover, .client-nav a.active { background: rgba(255,255,255,.1); color: #fff; text-decoration: none; }
.logout-link { color: #fca5a5 !important; }
.mobile-nav-toggle { display: none; background: none; border: none; color: #fff; font-size: 1.3rem; cursor: pointer; margin-left: auto; }
.client-wrapper { padding: 1.5rem; }
.client-content { max-width: 1100px; margin: 0 auto; }
.client-page-header { margin-bottom: 1.5rem; }
.client-page-header h2 { font-size: 1.4rem; font-weight: 700; color: var(--gray-800); }
.acct-chip { background: var(--primary-light); color: var(--primary-dark); font-size: .78rem; font-weight: 700; padding: .25rem .75rem; border-radius: 20px; }
.client-footer { text-align: center; padding: 1.5rem; color: var(--gray-400); font-size: .8rem; border-top: 1px solid var(--gray-200); }

/* ── Cards ───────────────────────────────── */
.card { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); margin-bottom: 1.5rem; overflow: hidden; }
.card-narrow { max-width: 760px; }
.card-header { display: flex; align-items: center; justify-content: space-between; padding: 1rem 1.25rem; border-bottom: 1px solid var(--gray-100); }
.card-title { font-size: 1rem; font-weight: 700; color: var(--gray-800); }
.form-body { padding: 1.25rem; }

/* ── Stats Grid ──────────────────────────── */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 1rem; margin-bottom: 1.5rem; }
.stats-grid-2 { grid-template-columns: repeat(2, 1fr); max-width: 520px; }
.stat-card { background: #fff; border-radius: var(--radius); padding: 1.25rem; box-shadow: var(--shadow); display: flex; align-items: center; gap: 1rem; border-left: 4px solid transparent; }
.stat-blue   { border-left-color: var(--primary); }
.stat-green  { border-left-color: var(--success); }
.stat-yellow { border-left-color: var(--warning); }
.stat-red    { border-left-color: var(--danger); }
.stat-teal   { border-left-color: var(--teal); }
.stat-purple { border-left-color: var(--purple); }
.stat-icon { font-size: 1.8rem; }
.stat-value { font-size: 1.4rem; font-weight: 800; color: var(--gray-800); line-height: 1; }
.stat-label { font-size: .75rem; color: var(--gray-500); font-weight: 500; margin-top: .25rem; }

/* ── Two Column Row ──────────────────────── */
.row-2col { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }

/* ── Tables ──────────────────────────────── */
.table-responsive { overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; font-size: .86rem; }
.table th { padding: .65rem 1rem; background: var(--gray-50); text-align: left; font-weight: 600; color: var(--gray-600); border-bottom: 1px solid var(--gray-200); white-space: nowrap; }
.table td { padding: .65rem 1rem; border-bottom: 1px solid var(--gray-100); vertical-align: middle; }
.table-hover tr:hover td { background: var(--gray-50); }
.text-right { text-align: right !important; }
.text-center { text-align: center !important; }
.text-muted  { color: var(--gray-400); }
.text-success { color: var(--success); }
.text-danger  { color: var(--danger); }

/* ── Badges ──────────────────────────────── */
.badge { display: inline-block; padding: .2rem .55rem; border-radius: 20px; font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .03em; }
.badge-success   { background: var(--success-bg);  color: var(--success); }
.badge-warning   { background: var(--warning-bg);  color: var(--warning); }
.badge-danger    { background: var(--danger-bg);   color: var(--danger); }
.badge-secondary { background: var(--gray-200);    color: var(--gray-600); }
.badge-info      { background: var(--info-bg);     color: var(--info); }

/* ── Buttons ─────────────────────────────── */
.btn { display: inline-flex; align-items: center; gap: .4rem; padding: .5rem 1rem; border-radius: var(--radius); font-size: .85rem; font-weight: 600; cursor: pointer; border: 2px solid transparent; transition: all .15s; white-space: nowrap; }
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #fff; }
.btn-success { background: var(--success); color: #fff; border-color: var(--success); }
.btn-success:hover { background: #15803d; color: #fff; }
.btn-warning { background: var(--warning); color: #fff; border-color: var(--warning); }
.btn-warning:hover { background: #b45309; color: #fff; }
.btn-danger  { background: var(--danger);  color: #fff; border-color: var(--danger);  }
.btn-danger:hover  { background: #b91c1c; color: #fff; }
.btn-teal    { background: var(--teal);    color: #fff; border-color: var(--teal); }
.btn-teal:hover    { background: #0f766e; color: #fff; }
.btn-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: var(--primary-light); }
.btn-ghost  { background: transparent; color: var(--gray-600); border-color: var(--gray-300); }
.btn-ghost:hover  { background: var(--gray-100); }
.btn-block  { width: 100%; justify-content: center; }
.btn-sm     { padding: .35rem .75rem; font-size: .8rem; }
.btn-xs     { padding: .2rem .5rem; font-size: .72rem; border-radius: 5px; }
.btn-group  { display: flex; gap: .5rem; }
.actions-cell { white-space: nowrap; }

/* ── Forms ───────────────────────────────── */
.form-group { margin-bottom: 1rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-control { width: 100%; padding: .5rem .75rem; border: 1.5px solid var(--gray-300); border-radius: var(--radius); font-family: var(--font); font-size: .88rem; color: var(--gray-800); background: #fff; transition: border .15s; }
.form-control:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light); }
.form-control:disabled { background: var(--gray-50); color: var(--gray-500); cursor: not-allowed; }
.form-control-sm { padding: .35rem .6rem; font-size: .82rem; }
label { display: block; font-size: .83rem; font-weight: 600; color: var(--gray-700); margin-bottom: .35rem; }
.required { color: var(--danger); }
.form-hint { font-size: .78rem; color: var(--gray-400); margin-top: .25rem; display: block; }
.form-actions { display: flex; gap: .75rem; padding-top: .5rem; }
.form-divider { font-size: .85rem; font-weight: 700; color: var(--gray-500); border-bottom: 1px solid var(--gray-200); padding-bottom: .5rem; margin: 1rem 0; }
textarea.form-control { resize: vertical; }
select.form-control { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%236b7280' d='M1 1l5 5 5-5'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right .75rem center; background-size: 12px; padding-right: 2.25rem; }

/* ── Alerts ──────────────────────────────── */
.alert { padding: .85rem 1rem; border-radius: var(--radius); margin-bottom: 1rem; font-size: .88rem; position: relative; }
.alert-success { background: var(--success-bg); color: #166534; border: 1px solid #bbf7d0; }
.alert-warning { background: var(--warning-bg); color: #92400e; border: 1px solid #fde68a; }
.alert-danger  { background: var(--danger-bg);  color: #991b1b; border: 1px solid #fecaca; }
.alert-info    { background: var(--info-bg);    color: #164e63; border: 1px solid #a5f3fc; }
.alert ul { margin: .35rem 0 0 1.25rem; list-style: disc; }
.alert-dismissible { padding-right: 2.5rem; }
.alert-close { position: absolute; top: .85rem; right: .75rem; background: none; border: none; font-size: 1.1rem; cursor: pointer; color: inherit; line-height: 1; opacity: .7; }
.alert-close:hover { opacity: 1; }

/* ── Filters Bar ─────────────────────────── */
.filters-bar { padding: .75rem 1.25rem; border-bottom: 1px solid var(--gray-100); background: var(--gray-50); }
.filters-form { display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; }

/* ── Pagination ──────────────────────────── */
.pagination { display: flex; gap: .3rem; padding: 1rem 1.25rem; }
.page-link { padding: .35rem .65rem; border-radius: 6px; font-size: .83rem; font-weight: 600; color: var(--primary); background: #fff; border: 1.5px solid var(--gray-200); }
.page-link.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.page-link:hover { background: var(--primary-light); text-decoration: none; }

/* ── Info Box ────────────────────────────── */
.info-box { background: var(--gray-50); border: 1px solid var(--gray-200); border-radius: var(--radius); padding: 1rem 1.25rem; display: flex; flex-direction: column; gap: .35rem; font-size: .88rem; }
.info-box div { color: var(--gray-700); }
.info-box strong { color: var(--gray-900); }

/* ── Info Grid ───────────────────────────── */
.info-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 0; }
.info-item { padding: .75rem 1.25rem; border-bottom: 1px solid var(--gray-100); }
.info-item span { display: block; font-size: .75rem; color: var(--gray-500); font-weight: 600; text-transform: uppercase; letter-spacing: .05em; margin-bottom: .2rem; }
.info-item strong { font-size: .9rem; color: var(--gray-800); }

/* ── Invoice ─────────────────────────────── */
.invoice-block { padding: 1.5rem; }
.invoice-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 1.5rem; }
.invoice-logo { font-size: 1.1rem; font-weight: 800; color: var(--gray-800); }
.invoice-sub { font-size: .78rem; color: var(--gray-400); }
.invoice-number { font-size: 1.1rem; font-weight: 700; color: var(--primary); text-align: right; }
.invoice-parties { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; margin-bottom: 1.5rem; font-size: .88rem; line-height: 1.7; }
.invoice-dates { display: flex; flex-direction: column; gap: .25rem; align-items: flex-end; font-size: .88rem; }
.invoice-dates div { display: flex; gap: .5rem; }
.invoice-dates span { color: var(--gray-500); }
.invoice-items { margin-bottom: 1rem; }
.invoice-notes { font-size: .84rem; color: var(--gray-600); border-top: 1px solid var(--gray-100); padding-top: 1rem; }
.table tfoot td { border-top: 1px solid var(--gray-200); font-size: .88rem; }

/* ── Radio & Checkbox ────────────────────── */
.radio-group { display: flex; gap: 1rem; flex-wrap: wrap; }
.radio-label, .checkbox-label { display: flex; align-items: center; gap: .5rem; font-weight: 500; cursor: pointer; font-size: .88rem; padding: .25rem 0; }
.client-checkbox-list { max-height: 260px; overflow-y: auto; border: 1.5px solid var(--gray-200); border-radius: var(--radius); padding: .5rem .75rem; display: flex; flex-direction: column; gap: .25rem; }

/* ── Misc ────────────────────────────────── */
.mb-0  { margin-bottom: 0 !important; }
.mb-4  { margin-bottom: 1rem !important; }
code   { font-family: 'Consolas', monospace; font-size: .82em; background: var(--gray-100); padding: .15rem .4rem; border-radius: 4px; color: var(--primary-dark); }
.admin-body .content > *:last-child { margin-bottom: 0; }

/* ── Responsive ──────────────────────────── */
@media (max-width: 1024px) {
  .row-2col { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-wrapper { margin-left: 0; }
  .sidebar-toggle { display: block; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .form-row { grid-template-columns: 1fr; }
  .invoice-parties { grid-template-columns: 1fr; gap: 1rem; }
  .invoice-dates { align-items: flex-start; }

  .client-topbar { padding: 0 1rem; }
  .client-nav { display: none; flex-direction: column; position: absolute; top: 60px; left: 0; right: 0; background: var(--gray-900); padding: .5rem 1rem; gap: .25rem; }
  .client-nav.open { display: flex; }
  .mobile-nav-toggle { display: block; }
  .client-wrapper { padding: 1rem; }

  .actions-cell .btn-xs { margin-bottom: 2px; }
  .filters-form { gap: .35rem; }
  .filters-form .form-control-sm { flex: 1; min-width: 120px; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .topbar { padding: 0 1rem; }
  .content { padding: 1rem; }
  .card-header { flex-wrap: wrap; gap: .5rem; }
}