/* LPG KHATA ERP - Design System */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

:root {
  --sidebar-w: 260px;
  --sidebar-collapsed: 72px;
  --topbar-h: 64px;
  --brand: #3B82F6;
  --brand-dark: #1D4ED8;
  --brand-light: #DBEAFE;
  --sidebar-bg: #0F172A;
  --sidebar-hover: #1E293B;
  --sidebar-active: rgba(59,130,246,0.15);
  --sidebar-text: #94A3B8;
  --sidebar-text-active: #F1F5F9;
  --bg: #F1F5F9;
  --card: #FFFFFF;
  --text: #0F172A;
  --text-sec: #64748B;
  --text-muted: #94A3B8;
  --border: #E2E8F0;
  --green: #10B981;
  --green-bg: #D1FAE5;
  --red: #EF4444;
  --red-bg: #FEE2E2;
  --amber: #F59E0B;
  --amber-bg: #FEF3C7;
  --purple: #8B5CF6;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --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);
  --shadow-lg: 0 10px 15px rgba(0,0,0,.1), 0 4px 6px rgba(0,0,0,.05);
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --transition: .2s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { font-family: 'Inter', system-ui, sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; -webkit-font-smoothing: antialiased; }

/* ===== SIDEBAR ===== */
.sidebar { position: fixed; top: 0; left: 0; bottom: 0; width: var(--sidebar-w); background: var(--sidebar-bg); z-index: 100; display: flex; flex-direction: column; transition: width .3s ease; overflow: hidden; }
.sidebar.collapsed { width: var(--sidebar-collapsed); }
.sidebar__brand { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; border-bottom: 1px solid rgba(255,255,255,.06); min-height: 64px; transition: var(--transition); }
.sidebar__logo { display: flex; align-items: center; gap: 12px; transition: var(--transition); }
.sidebar__brand-text { font-size: 18px; font-weight: 800; color: #F1F5F9; letter-spacing: .5px; white-space: nowrap; }
.sidebar.collapsed .sidebar__brand { padding: 16px 0; justify-content: center; }
.sidebar.collapsed .sidebar__brand-text, .sidebar.collapsed .sidebar__logo { display: none; }
.sidebar.collapsed .sidebar__toggle svg { transform: rotate(180deg); }
.sidebar__toggle { background: none; border: none; color: var(--sidebar-text); cursor: pointer; padding: 4px; border-radius: 6px; transition: var(--transition); display: flex; align-items: center; justify-content: center; }
.sidebar__toggle:hover { background: var(--sidebar-hover); color: #fff; }

.sidebar__nav { flex: 1; overflow-y: auto; overflow-x: hidden; padding: 12px 8px; }
.sidebar__nav::-webkit-scrollbar { width: 4px; }
.sidebar__nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,.1); border-radius: 2px; }

.sidebar__divider { height: 1px; background: rgba(255,255,255,.06); margin: 12px 8px; }
.sidebar__section-label { font-size: 10px; font-weight: 700; color: rgba(148,163,184,.5); text-transform: uppercase; letter-spacing: 2px; padding: 8px 16px 4px; white-space: nowrap; }

.sidebar__link { display: flex; align-items: center; gap: 12px; padding: 10px 16px; border-radius: var(--radius); color: var(--sidebar-text); text-decoration: none; font-size: 14px; font-weight: 500; transition: var(--transition); white-space: nowrap; }
.sidebar__link:hover { background: var(--sidebar-hover); color: var(--sidebar-text-active); }
.sidebar__link.active { background: var(--sidebar-active); color: var(--brand); font-weight: 600; }
.sidebar__link svg { flex-shrink: 0; }

.sidebar__group-btn { display: flex; align-items: center; gap: 12px; width: 100%; padding: 10px 16px; border-radius: var(--radius); color: var(--sidebar-text); font-size: 14px; font-weight: 500; background: none; border: none; cursor: pointer; transition: var(--transition); text-align: left; white-space: nowrap; }
.sidebar__group-btn:hover { background: var(--sidebar-hover); color: var(--sidebar-text-active); }
.sidebar__group-btn svg:first-child { flex-shrink: 0; }
.sidebar__group-btn span { flex: 1; }
.sidebar__chevron { transition: transform .2s; margin-left: auto; flex-shrink: 0; }
.sidebar__group.open > .sidebar__group-btn .sidebar__chevron { transform: rotate(180deg); }
.sidebar__group.open > .sidebar__group-btn { color: var(--sidebar-text-active); }

.sidebar__submenu { display: none; padding-left: 20px; }
.sidebar__group.open > .sidebar__submenu { display: block; }
.sidebar__sublink { display: block; padding: 8px 16px 8px 28px; font-size: 13px; color: var(--sidebar-text); text-decoration: none; border-radius: 6px; transition: var(--transition); position: relative; white-space: nowrap; }
.sidebar__sublink::before { content: ''; position: absolute; left: 14px; top: 50%; width: 4px; height: 4px; border-radius: 50%; background: var(--sidebar-text); transform: translateY(-50%); transition: var(--transition); }
.sidebar__sublink:hover { color: var(--sidebar-text-active); background: var(--sidebar-hover); }
.sidebar__sublink.active { color: var(--brand); font-weight: 600; }
.sidebar__sublink.active::before { background: var(--brand); }

.sidebar.collapsed .sidebar__section-label, .sidebar.collapsed .sidebar__submenu, .sidebar.collapsed .sidebar__group-btn span, .sidebar.collapsed .sidebar__chevron, .sidebar.collapsed .sidebar__link span { display: none; }
.sidebar.collapsed .sidebar__group-btn, .sidebar.collapsed .sidebar__link { justify-content: center; padding: 10px; }

/* ===== MAIN WRAPPER ===== */
.main-wrapper { margin-left: var(--sidebar-w); min-height: 100vh; transition: margin-left .3s ease; display: flex; flex-direction: column; }
.sidebar.collapsed ~ .main-wrapper { margin-left: var(--sidebar-collapsed); }

/* ===== TOPBAR ===== */
.topbar { height: var(--topbar-h); background: var(--card); border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; padding: 0 24px; position: sticky; top: 0; z-index: 50; }
.topbar__left { display: flex; align-items: center; gap: 16px; }
.topbar__menu-btn { display: none; background: none; border: none; color: var(--text-sec); cursor: pointer; padding: 6px; border-radius: 6px; }
.topbar__menu-btn:hover { background: var(--bg); }
.topbar__breadcrumb { display: flex; align-items: center; gap: 8px; }
.topbar__breadcrumb-module { font-size: 16px; font-weight: 700; color: var(--text); }
.topbar__breadcrumb-page { font-size: 14px; font-weight: 500; color: var(--text-sec); }
.topbar__right { display: flex; align-items: center; gap: 12px; }
.topbar__search { display: flex; align-items: center; gap: 8px; background: var(--bg); border-radius: var(--radius); padding: 8px 14px; }
.topbar__search svg { color: var(--text-muted); flex-shrink: 0; }
.topbar__search-input { border: none; background: none; font-family: inherit; font-size: 14px; color: var(--text); outline: none; width: 200px; }
.topbar__icon-btn { position: relative; background: none; border: none; color: var(--text-sec); cursor: pointer; padding: 8px; border-radius: var(--radius); transition: var(--transition); }
.topbar__icon-btn:hover { background: var(--bg); color: var(--text); }
.topbar__badge { position: absolute; top: 2px; right: 2px; width: 18px; height: 18px; border-radius: 50%; background: var(--red); color: #fff; font-size: 10px; font-weight: 700; display: flex; align-items: center; justify-content: center; }
.topbar__user { display: flex; align-items: center; gap: 10px; cursor: pointer; padding: 6px 10px; border-radius: var(--radius); transition: var(--transition); }
.topbar__user:hover { background: var(--bg); }
.topbar__avatar { width: 34px; height: 34px; border-radius: 50%; background: linear-gradient(135deg, var(--brand), var(--purple)); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 13px; }
.topbar__user-name { font-size: 14px; font-weight: 600; }

/* ===== CONTENT ===== */
.content { padding: 24px; position: relative; }

/* ===== ALERTS ===== */
.alert { display: flex; align-items: center; gap: 12px; padding: 14px 20px; border-radius: var(--radius); margin-bottom: 20px; font-size: 14px; font-weight: 500; animation: slideDown .3s ease; }
.alert--success { background: var(--green-bg); color: #065F46; border: 1px solid #A7F3D0; }
.alert--error { background: var(--red-bg); color: #991B1B; border: 1px solid #FECACA; }
.alert__close { margin-left: auto; background: none; border: none; font-size: 20px; cursor: pointer; color: inherit; opacity: .6; }
@keyframes slideDown { from { transform: translateY(-10px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

/* ===== DASHBOARD ===== */
.dashboard { max-width: 1400px; }
.dash-welcome { display: flex; align-items: center; justify-content: space-between; margin-bottom: 28px; }
.dash-welcome__title { font-size: 26px; font-weight: 800; color: var(--text); }
.dash-welcome__subtitle { font-size: 14px; color: var(--text-sec); margin-top: 4px; }
.dash-welcome__date { display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 500; color: var(--text-sec); background: var(--card); padding: 10px 18px; border-radius: var(--radius); border: 1px solid var(--border); }

.dash-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 28px; }
.dash-stat-card { background: var(--card); border-radius: var(--radius-lg); padding: 24px; border: 1px solid var(--border); display: flex; gap: 16px; transition: var(--transition); box-shadow: var(--shadow-sm); }
.dash-stat-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.dash-stat-card__icon { width: 48px; height: 48px; border-radius: var(--radius); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.dash-stat-card--sales .dash-stat-card__icon { background: var(--green-bg); color: var(--green); }
.dash-stat-card--purchase .dash-stat-card__icon { background: var(--brand-light); color: var(--brand); }
.dash-stat-card--receivable .dash-stat-card__icon { background: var(--amber-bg); color: var(--amber); }
.dash-stat-card--stock .dash-stat-card__icon { background: #EDE9FE; color: var(--purple); }
.dash-stat-card__info { flex: 1; }
.dash-stat-card__label { font-size: 12px; font-weight: 600; color: var(--text-sec); text-transform: uppercase; letter-spacing: .5px; }
.dash-stat-card__value { font-size: 24px; font-weight: 800; color: var(--text); display: block; margin: 4px 0; }
.dash-stat-card__change { font-size: 12px; font-weight: 500; color: var(--text-muted); display: flex; align-items: center; gap: 4px; }
.dash-stat-card__change--up { color: var(--green); }
.dash-stat-card__change--warn { color: var(--amber); }

.dash-row { display: grid; grid-template-columns: 2fr 1fr; gap: 20px; margin-bottom: 28px; }
.dash-row:last-child { grid-template-columns: repeat(3, 1fr); }
.dash-card { background: var(--card); border-radius: var(--radius-lg); border: 1px solid var(--border); box-shadow: var(--shadow-sm); overflow: hidden; }
.dash-card--wide { grid-column: span 1; }
.dash-card__header { display: flex; align-items: center; justify-content: space-between; padding: 20px 24px 16px; border-bottom: 1px solid var(--border); }
.dash-card__title { font-size: 16px; font-weight: 700; display: flex; align-items: center; gap: 8px; }
.dash-card__title--warn { color: var(--amber); }
.dash-card__link { font-size: 13px; font-weight: 600; color: var(--brand); text-decoration: none; }
.dash-card__link:hover { text-decoration: underline; }

/* Dashboard Table */
.dash-table-wrap { overflow-x: auto; }
.dash-table { width: 100%; border-collapse: collapse; }
.dash-table th { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: .5px; color: var(--text-sec); padding: 12px 16px; text-align: left; background: var(--bg); }
.dash-table td { padding: 14px 16px; font-size: 14px; border-bottom: 1px solid var(--border); }
.dash-table tr:hover td { background: #F8FAFC; }
.dash-table__code { font-weight: 600; color: var(--brand); }
.dash-table__amount { font-weight: 700; }
.dash-table__empty { text-align: center; color: var(--text-muted); padding: 32px 16px !important; }
.dash-table__empty a { color: var(--brand); text-decoration: none; font-weight: 600; }

.status-badge { padding: 4px 10px; border-radius: 20px; font-size: 11px; font-weight: 600; }
.status-badge--paid { background: var(--green-bg); color: #065F46; }
.status-badge--unpaid { background: var(--red-bg); color: #991B1B; }
.status-badge--partial { background: var(--amber-bg); color: #92400E; }
.status-badge--pending { background: var(--amber-bg); color: #92400E; }
.status-badge--completed { background: var(--green-bg); color: #065F46; }
.status-badge--cancelled { background: #F3F4F6; color: #6B7280; }

/* Quick Actions */
.dash-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; padding: 16px 20px; }
.dash-action-btn { display: flex; align-items: center; gap: 10px; padding: 14px 16px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--card); font-size: 13px; font-weight: 600; color: var(--text); text-decoration: none; transition: var(--transition); cursor: pointer; }
.dash-action-btn:hover { border-color: var(--brand); color: var(--brand); background: var(--brand-light); }
.dash-action-btn--primary { background: var(--brand); color: #fff; border-color: var(--brand); grid-column: span 2; justify-content: center; }
.dash-action-btn--primary:hover { background: var(--brand-dark); color: #fff; }

/* Alerts & Cash Summary */
.dash-alerts { padding: 12px 20px; max-height: 300px; overflow-y: auto; }
.dash-alert-item { display: flex; align-items: center; justify-content: space-between; padding: 12px 0; border-bottom: 1px solid var(--border); }
.dash-alert-item:last-child { border-bottom: none; }
.dash-alert-item__name { font-size: 14px; font-weight: 600; }
.dash-alert-item__meta { font-size: 12px; color: var(--text-muted); display: block; margin-top: 2px; }
.dash-alert-item__badge { padding: 4px 10px; border-radius: 20px; font-size: 11px; font-weight: 700; background: var(--red-bg); color: var(--red); }
.dash-alert-item__amount { font-size: 14px; font-weight: 700; color: var(--text); }
.dash-empty-state { text-align: center; padding: 32px 16px; color: var(--text-muted); }
.dash-empty-state svg { margin: 0 auto 12px; color: var(--green); }
.dash-empty-state p { font-size: 14px; }

.dash-cash-summary { padding: 20px 24px; }
.dash-cash-row { display: flex; justify-content: space-between; padding: 12px 0; }
.dash-cash-row__label { font-size: 14px; color: var(--text-sec); }
.dash-cash-row__value { font-size: 16px; font-weight: 700; }
.dash-cash-row--in .dash-cash-row__value { color: var(--green); }
.dash-cash-row--out .dash-cash-row__value { color: var(--red); }
.dash-cash-row--net { padding-top: 16px; }
.dash-cash-row--net .dash-cash-row__label { font-weight: 600; color: var(--text); }
.dash-cash-row--net .dash-cash-row__value { font-size: 20px; color: var(--brand); }
.dash-cash-divider { height: 1px; background: var(--border); }

/* ===== PAGE HEADER ===== */
.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; }
.page-header__title { font-size: 24px; font-weight: 800; }
.page-header__actions { display: flex; gap: 10px; }

/* ===== BUTTONS ===== */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 20px; border-radius: var(--radius); font-family: inherit; font-size: 14px; font-weight: 600; cursor: pointer; border: 1px solid transparent; transition: var(--transition); text-decoration: none; white-space: nowrap; }
.btn--primary { background: var(--brand); color: #fff; }
.btn--primary:hover { background: var(--brand-dark); }
.btn--success { background: var(--green); color: #fff; }
.btn--success:hover { background: #059669; }
.btn--danger { background: var(--red); color: #fff; }
.btn--danger:hover { background: #DC2626; }
.btn--outline { background: var(--card); color: var(--text); border-color: var(--border); }
.btn--outline:hover { border-color: var(--brand); color: var(--brand); }
.btn--sm { padding: 6px 14px; font-size: 13px; }
.btn--icon { padding: 8px; }

/* ===== FORM ELEMENTS ===== */
.form-group { margin-bottom: 18px; }
.form-label { display: block; font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 6px; }
.form-input, .form-select, .form-textarea { width: 100%; padding: 10px 14px; border: 1px solid var(--border); border-radius: var(--radius); font-family: inherit; font-size: 14px; color: var(--text); background: var(--card); outline: none; transition: var(--transition); }
.form-input:focus, .form-select:focus, .form-textarea:focus { border-color: var(--brand); box-shadow: 0 0 0 3px rgba(59,130,246,.1); }
.form-textarea { min-height: 80px; resize: vertical; }
.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }
.form-error { font-size: 12px; color: var(--red); margin-top: 4px; }

/* ===== DATA TABLE ===== */
.data-card { background: var(--card); border-radius: var(--radius-lg); border: 1px solid var(--border); box-shadow: var(--shadow-sm); }
.data-card__header { display: flex; align-items: center; justify-content: space-between; padding: 20px 24px; border-bottom: 1px solid var(--border); flex-wrap: wrap; gap: 12px; }
.data-card__title { font-size: 18px; font-weight: 700; }
.data-card__filters { display: flex; gap: 10px; align-items: center; }
.data-card__search { display: flex; align-items: center; gap: 8px; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 8px 14px; }
.data-card__search input { border: none; background: none; font-family: inherit; font-size: 14px; outline: none; width: 200px; }

.data-table { width: 100%; border-collapse: collapse; }
.data-table th { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .5px; color: var(--text-sec); padding: 14px 16px; text-align: left; background: var(--bg); border-bottom: 1px solid var(--border); position: sticky; top: 0; }
.data-table td { padding: 14px 16px; font-size: 14px; border-bottom: 1px solid var(--border); }
.data-table tr:hover td { background: #F8FAFC; }
.data-table__actions { display: flex; gap: 6px; }

/* ===== VOUCHER FORM ===== */
.voucher-card { background: var(--card); border-radius: var(--radius-lg); border: 1px solid var(--border); padding: 28px; box-shadow: var(--shadow-sm); }
.voucher-card__title { font-size: 20px; font-weight: 700; margin-bottom: 24px; padding-bottom: 16px; border-bottom: 1px solid var(--border); }
.voucher-items-table { width: 100%; border-collapse: collapse; margin: 20px 0; }
.voucher-items-table th { font-size: 12px; font-weight: 600; text-transform: uppercase; color: var(--text-sec); padding: 10px 12px; text-align: left; background: var(--bg); border: 1px solid var(--border); }
.voucher-items-table td { padding: 8px 12px; border: 1px solid var(--border); }
.voucher-items-table input, .voucher-items-table select { width: 100%; padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px; font-family: inherit; font-size: 14px; }
.voucher-items-table input:focus, .voucher-items-table select:focus { border-color: var(--brand); outline: none; }
.voucher-totals { display: flex; flex-direction: column; align-items: flex-end; gap: 8px; margin-top: 20px; }
.voucher-total-row { display: flex; gap: 20px; align-items: center; }
.voucher-total-row span:first-child { font-size: 14px; color: var(--text-sec); min-width: 120px; text-align: right; }
.voucher-total-row span:last-child { font-size: 16px; font-weight: 700; min-width: 140px; text-align: right; }
.voucher-total-row--net span:last-child { font-size: 22px; color: var(--brand); }
.voucher-actions { display: flex; gap: 12px; justify-content: flex-end; margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--border); }

/* ===== TOAST ===== */
.toast-container { position: fixed; top: 80px; right: 24px; z-index: 300; }
.toast { padding: 14px 24px; border-radius: var(--radius); color: #fff; font-size: 14px; font-weight: 500; margin-bottom: 8px; box-shadow: var(--shadow-lg); animation: toastIn .3s ease, toastOut .3s ease 2.7s forwards; }
@keyframes toastIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes toastOut { from { opacity: 1; } to { opacity: 0; transform: translateY(-10px); } }
.toast--success { background: var(--green); }
.toast--error { background: var(--red); }

/* ===== PRINT ===== */
@media print { .sidebar, .topbar, .page-header__actions, .voucher-actions { display: none !important; } .main-wrapper { margin-left: 0 !important; } .content { padding: 0; height: auto; overflow: visible; } }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .dash-stats { grid-template-columns: repeat(2, 1fr); }
  .dash-row, .dash-row:last-child { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); width: var(--sidebar-w); }
  .sidebar.mobile-open { transform: translateX(0); }
  .main-wrapper { margin-left: 0 !important; }
  .topbar__menu-btn { display: flex; }
  .topbar__search { display: none; }
  .dash-stats { grid-template-columns: 1fr; }
  .dash-actions { grid-template-columns: 1fr; }
  .dash-action-btn--primary { grid-column: span 1; }
}

/* ===== SCROLLBAR ===== */
.content::-webkit-scrollbar { width: 6px; }
.content::-webkit-scrollbar-track { background: transparent; }
.content::-webkit-scrollbar-thumb { background: #CBD5E1; border-radius: 3px; }
.content::-webkit-scrollbar-thumb:hover { background: #94A3B8; }