/* ============================================================
   Business CRM - Premium Design System
   ============================================================ */

/* ─── Google Fonts ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ─── CSS Custom Properties ────────────────────────────────── */
:root {
    /* Primary palette */
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --primary-glow: rgba(99, 102, 241, 0.15);
    
    /* Accent */
    --accent: #06b6d4;
    --accent-light: #22d3ee;
    
    /* Success / Warning / Danger */
    --success: #10b981;
    --success-light: #34d399;
    --warning: #f59e0b;
    --warning-light: #fbbf24;
    --danger: #ef4444;
    --danger-light: #f87171;
    
    /* Dark mode colors */
    --bg-body: #0f1117;
    --bg-sidebar: #151823;
    --bg-card: #1a1d2e;
    --bg-card-hover: #1e2235;
    --bg-input: #1e2235;
    --bg-modal: #1a1d2e;
    
    /* Borders */
    --border-color: rgba(255,255,255,0.06);
    --border-light: rgba(255,255,255,0.1);
    
    /* Text */
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-dark: #0f172a;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a78bfa 100%);
    --gradient-accent: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #34d399 100%);
    --gradient-warm: linear-gradient(135deg, #f59e0b 0%, #f97316 100%);
    --gradient-danger: linear-gradient(135deg, #ef4444 0%, #f97316 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.02) 100%);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.25);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.35);
    --shadow-glow: 0 0 20px rgba(99,102,241,0.15);
    
    /* Layout */
    --sidebar-width: 260px;
    --sidebar-collapsed: 70px;
    --topbar-height: 65px;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s ease;
}

/* ─── Reset & Base ─────────────────────────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 15px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
    background: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--primary-light);
    text-decoration: none;
    transition: var(--transition-fast);
}
a:hover { color: var(--accent-light); }

img { max-width: 100%; }

/* ─── Scrollbar ────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* ─── Layout ───────────────────────────────────────────────── */
.app-wrapper {
    display: flex;
    min-height: 100vh;
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding-top: var(--topbar-height);
    transition: var(--transition);
    min-height: 100vh;
}

.content-area {
    padding: 28px;
    max-width: 1400px;
}

body.sidebar-collapsed .main-content {
    margin-left: var(--sidebar-collapsed);
}

/* ─── Sidebar ──────────────────────────────────────────────── */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
}

body.sidebar-collapsed .sidebar {
    width: var(--sidebar-collapsed);
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 65px;
}

.sidebar-logo {
    width: 36px;
    height: 36px;
    background: var(--gradient-primary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 16px;
    color: white;
    flex-shrink: 0;
}

.sidebar-brand {
    font-weight: 700;
    font-size: 17px;
    white-space: nowrap;
    overflow: hidden;
    transition: var(--transition);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

body.sidebar-collapsed .sidebar-brand { opacity: 0; width: 0; }

.sidebar-nav {
    padding: 12px 10px;
    flex: 1;
}

.nav-section {
    margin-bottom: 8px;
}

.nav-section-title {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--text-muted);
    padding: 8px 14px 6px;
    white-space: nowrap;
    overflow: hidden;
}

body.sidebar-collapsed .nav-section-title { opacity: 0; height: 0; padding: 0; margin: 0; }

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition-fast);
    white-space: nowrap;
    position: relative;
    margin-bottom: 2px;
}

.nav-item:hover {
    background: rgba(99, 102, 241, 0.08);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--primary-glow);
    color: var(--primary-light);
}

.nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 20px;
    background: var(--primary);
    border-radius: 0 3px 3px 0;
}

.nav-icon {
    font-size: 18px;
    width: 24px;
    text-align: center;
    flex-shrink: 0;
}

body.sidebar-collapsed .nav-item span:not(.nav-icon) {
    opacity: 0;
    width: 0;
    overflow: hidden;
}

/* ─── Topbar ───────────────────────────────────────────────── */
.topbar {
    position: fixed;
    top: 0;
    left: var(--sidebar-width);
    right: 0;
    height: var(--topbar-height);
    background: rgba(15, 17, 23, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 28px;
    transition: var(--transition);
}

body.sidebar-collapsed .topbar {
    left: var(--sidebar-collapsed);
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.topbar-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 20px;
    cursor: pointer;
    padding: 6px;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}
.topbar-toggle:hover {
    background: rgba(255,255,255,0.05);
    color: var(--text-primary);
}

.topbar-title {
    font-size: 18px;
    font-weight: 600;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 14px;
    border-radius: var(--radius);
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition-fast);
}
.topbar-user:hover { background: rgba(255,255,255,0.07); }

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 13px;
    color: white;
}

.user-info { line-height: 1.3; }
.user-name { font-size: 13px; font-weight: 600; }
.user-role { font-size: 11px; color: var(--text-muted); }

/* ─── Page Header ──────────────────────────────────────────── */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 28px;
    flex-wrap: wrap;
    gap: 16px;
}

.page-title {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.3px;
}

.page-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.page-actions {
    display: flex;
    gap: 10px;
    align-items: center;
}

/* ─── Cards ────────────────────────────────────────────────── */
.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    padding: 24px;
    transition: var(--transition);
}

.card:hover {
    border-color: var(--border-light);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 16px;
    font-weight: 600;
}

/* ─── Stat Cards ───────────────────────────────────────────── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 28px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    padding: 24px;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-light);
}
.stat-card:hover::before { opacity: 1; }

.stat-card.gradient-1::before { background: var(--gradient-primary); opacity: 1; }
.stat-card.gradient-2::before { background: var(--gradient-accent); opacity: 1; }
.stat-card.gradient-3::before { background: var(--gradient-success); opacity: 1; }
.stat-card.gradient-4::before { background: var(--gradient-warm); opacity: 1; }

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 16px;
}

.stat-icon.purple { background: rgba(99,102,241,0.12); color: var(--primary-light); }
.stat-icon.cyan { background: rgba(6,182,212,0.12); color: var(--accent); }
.stat-icon.green { background: rgba(16,185,129,0.12); color: var(--success); }
.stat-icon.amber { background: rgba(245,158,11,0.12); color: var(--warning); }
.stat-icon.red { background: rgba(239,68,68,0.12); color: var(--danger); }

.stat-value {
    font-size: 28px;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ─── Buttons ──────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    font-family: inherit;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 2px 8px rgba(99,102,241,0.25);
}
.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(99,102,241,0.35);
    color: white;
}

.btn-success {
    background: var(--gradient-success);
    color: white;
}
.btn-success:hover { transform: translateY(-1px); color: white; }

.btn-danger {
    background: var(--danger);
    color: white;
}
.btn-danger:hover { background: var(--danger-light); color: white; }

.btn-warning {
    background: var(--gradient-warm);
    color: white;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-light);
    color: var(--text-secondary);
}
.btn-outline:hover {
    background: rgba(255,255,255,0.05);
    color: var(--text-primary);
    border-color: var(--primary);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
}

/* ─── Forms ────────────────────────────────────────────────── */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
    letter-spacing: 0.3px;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: var(--transition-fast);
    outline: none;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.form-control::placeholder {
    color: var(--text-muted);
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.form-check {
    display: flex;
    align-items: center;
    gap: 8px;
}

.form-check input[type="checkbox"] {
    accent-color: var(--primary);
    width: 16px;
    height: 16px;
}

/* ─── Tables ───────────────────────────────────────────────── */
.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.table th {
    background: rgba(255,255,255,0.03);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--text-muted);
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

.table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.table tr:last-child td {
    border-bottom: none;
}

.table tr:hover td {
    background: rgba(99,102,241,0.03);
}

.table .actions {
    display: flex;
    gap: 6px;
}

/* ─── Badges ───────────────────────────────────────────────── */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.3px;
}

.badge-success { background: rgba(16,185,129,0.12); color: var(--success-light); }
.badge-warning { background: rgba(245,158,11,0.12); color: var(--warning-light); }
.badge-danger { background: rgba(239,68,68,0.12); color: var(--danger-light); }
.badge-primary { background: var(--primary-glow); color: var(--primary-light); }
.badge-info { background: rgba(6,182,212,0.12); color: var(--accent-light); }

/* ─── Alerts / Flash Messages ──────────────────────────────── */
.alert {
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: slideIn 0.3s ease;
}

.alert-success {
    background: rgba(16,185,129,0.1);
    border: 1px solid rgba(16,185,129,0.2);
    color: var(--success-light);
}

.alert-error {
    background: rgba(239,68,68,0.1);
    border: 1px solid rgba(239,68,68,0.2);
    color: var(--danger-light);
}

.alert-warning {
    background: rgba(245,158,11,0.1);
    border: 1px solid rgba(245,158,11,0.2);
    color: var(--warning-light);
}

.alert-info {
    background: rgba(6,182,212,0.1);
    border: 1px solid rgba(6,182,212,0.2);
    color: var(--accent-light);
}

.alert-close {
    margin-left: auto;
    background: none;
    border: none;
    color: inherit;
    opacity: 0.6;
    cursor: pointer;
    font-size: 18px;
}
.alert-close:hover { opacity: 1; }

/* ─── Modal ────────────────────────────────────────────────── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}
.modal-overlay.active { opacity: 1; visibility: visible; }

.modal {
    background: var(--bg-modal);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px;
    width: 90%;
    max-width: 560px;
    max-height: 85vh;
    overflow-y: auto;
    transform: scale(0.95);
    transition: var(--transition);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.modal-title {
    font-size: 18px;
    font-weight: 700;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 22px;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
}
.modal-close:hover { color: var(--text-primary); }

/* ─── Search Bar ───────────────────────────────────────────── */
.search-bar {
    position: relative;
    max-width: 350px;
}

.search-bar input {
    padding-left: 40px;
}

.search-bar .search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 16px;
}

/* ─── Empty State ──────────────────────────────────────────── */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.4;
}

.empty-state-text {
    font-size: 16px;
    margin-bottom: 8px;
}

/* ─── Auth Pages ───────────────────────────────────────────── */
.auth-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: var(--bg-body);
    position: relative;
    overflow: hidden;
}

.auth-wrapper::before {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(99,102,241,0.12) 0%, transparent 70%);
    top: -100px;
    right: -100px;
    border-radius: 50%;
}

.auth-wrapper::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(6,182,212,0.08) 0%, transparent 70%);
    bottom: -100px;
    left: -100px;
    border-radius: 50%;
}

.auth-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    width: 100%;
    max-width: 440px;
    position: relative;
    z-index: 1;
    box-shadow: var(--shadow-lg);
}

.auth-logo {
    text-align: center;
    margin-bottom: 32px;
}

.auth-logo-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 14px;
    background: var(--gradient-primary);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: white;
    box-shadow: 0 4px 16px rgba(99,102,241,0.3);
}

.auth-logo h1 {
    font-size: 22px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.auth-logo p {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 4px;
}

.auth-form .btn {
    width: 100%;
    justify-content: center;
    padding: 12px;
    font-size: 15px;
    margin-top: 6px;
}

.auth-footer {
    text-align: center;
    margin-top: 22px;
    font-size: 14px;
    color: var(--text-muted);
}

.auth-footer a {
    color: var(--primary-light);
    font-weight: 600;
}

/* ─── Invoice Print Styles ─────────────────────────────────── */
.invoice-page {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    color: #1a1a2e;
    padding: 40px;
    border-radius: var(--radius-lg);
}

.invoice-page * { color: #1a1a2e; }

.invoice-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 32px;
    padding-bottom: 20px;
    border-bottom: 2px solid #e2e8f0;
}

.invoice-brand h2 {
    font-size: 24px;
    color: #4f46e5;
    margin-bottom: 4px;
}

.invoice-brand p { font-size: 13px; color: #64748b; }

.invoice-meta { text-align: right; }
.invoice-meta h3 { font-size: 20px; color: #64748b; text-transform: uppercase; letter-spacing: 2px; }
.invoice-meta p { font-size: 13px; color: #64748b; margin-top: 4px; }

.invoice-parties {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-bottom: 32px;
}

.invoice-party h4 {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #94a3b8;
    margin-bottom: 8px;
}
.invoice-party p { font-size: 14px; line-height: 1.6; }

.invoice-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 24px;
}

.invoice-table th {
    background: #f1f5f9;
    padding: 12px 16px;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: #64748b;
    text-align: left;
    border-bottom: 2px solid #e2e8f0;
}

.invoice-table td {
    padding: 12px 16px;
    border-bottom: 1px solid #f1f5f9;
    font-size: 14px;
}

.invoice-total {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 32px;
}

.invoice-total table {
    width: 280px;
}

.invoice-total td {
    padding: 8px 16px;
    font-size: 14px;
}

.invoice-total .grand-total td {
    font-size: 18px;
    font-weight: 700;
    color: #4f46e5;
    border-top: 2px solid #4f46e5;
    padding-top: 12px;
}

.invoice-footer {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #e2e8f0;
    color: #94a3b8;
    font-size: 13px;
}

.invoice-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 24px;
}

@media print {
    body { background: white !important; }
    .sidebar, .topbar, .invoice-actions { display: none !important; }
    .main-content { margin: 0 !important; padding: 0 !important; }
    .content-area { padding: 0 !important; }
    .invoice-page { box-shadow: none !important; padding: 20px !important; }
}

/* ─── Animations ───────────────────────────────────────────── */
@keyframes slideIn {
    from { transform: translateY(-10px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.fade-in { animation: fadeIn 0.4s ease; }

/* ─── Grid Helpers ─────────────────────────────────────────── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

/* ─── Utility Classes ──────────────────────────────────────── */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-muted) !important; }
.text-success { color: var(--success) !important; }
.text-danger { color: var(--danger) !important; }
.text-warning { color: var(--warning) !important; }
.text-primary { color: var(--primary-light) !important; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.d-flex { display: flex; }
.gap-2 { gap: 16px; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }

/* ─── Responsive ───────────────────────────────────────────── */
@media (max-width: 992px) {
    .sidebar {
        transform: translateX(-100%);
    }
    body.sidebar-open .sidebar {
        transform: translateX(0);
    }
    .main-content {
        margin-left: 0 !important;
    }
    .topbar {
        left: 0 !important;
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }
    .invoice-parties {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .content-area { padding: 16px; }
    .stats-grid { grid-template-columns: 1fr; }
    .page-header { flex-direction: column; align-items: flex-start; }
    .auth-card { padding: 28px 20px; }
    .table th, .table td { padding: 10px 12px; font-size: 13px; }
}

/* ─── Low Stock Indicator ──────────────────────────────────── */
.stock-low {
    color: var(--danger);
    font-weight: 600;
}

.stock-ok {
    color: var(--success);
}

/* ─── Checkbox Select All ──────────────────────────────────── */
.customer-select {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 8px;
    max-height: 300px;
    overflow-y: auto;
    padding: 12px;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.customer-select label {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: 14px;
}

.customer-select label:hover {
    background: rgba(99,102,241,0.08);
}

/* ─── Dynamic Line Items ───────────────────────────────────── */
.line-items-table {
    width: 100%;
    border-collapse: collapse;
}

.line-items-table th {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    padding: 8px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.line-items-table td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-color);
}

.line-items-table input,
.line-items-table select {
    width: 100%;
    padding: 8px 10px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 13px;
    font-family: inherit;
}

.line-items-table .btn-remove {
    background: rgba(239,68,68,0.1);
    color: var(--danger);
    border: none;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
}
.line-items-table .btn-remove:hover { background: rgba(239,68,68,0.2); }

.line-total {
    text-align: right;
    padding: 8px 12px;
    font-weight: 600;
    min-width: 100px;
}

#add-item-btn {
    margin-top: 12px;
}