* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #ec4899;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --dark: #1e293b;
    --light: #f8fafc;
    --gray: #64748b;
    --border: #e2e8f0;
    --shadow: 0 10px 30px rgba(0,0,0,0.1);
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

body {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    color: var(--dark);
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 260px;
    height: 100vh;
    background: var(--gradient);
    padding: 30px 20px;
    box-shadow: var(--shadow);
    z-index: 100;
    overflow-y: auto;
}

.sidebar .logo {
    color: white;
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 40px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar .logo::before {
    content: "🛒";
    font-size: 30px;
}

.sidebar nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    color: rgba(255,255,255,0.85);
    text-decoration: none;
    padding: 14px 18px;
    border-radius: 12px;
    margin-bottom: 8px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.sidebar nav a:hover,
.sidebar nav a.active {
    background: rgba(255,255,255,0.2);
    color: white;
    transform: translateX(5px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.sidebar nav a .icon {
    font-size: 20px;
}

/* Main Content */
.main-content {
    margin-left: 260px;
    padding: 30px;
    min-height: 100vh;
}

.header {
    background: white;
    padding: 20px 30px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    font-size: 28px;
    color: var(--dark);
    font-weight: 700;
}

.header .date {
    color: var(--gray);
    font-size: 14px;
}

/* Cards */
.card {
    background: white;
    border-radius: 16px;
    padding: 25px;
    box-shadow: var(--shadow);
    margin-bottom: 25px;
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-3px);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border);
}

.card-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    padding: 25px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient);
}

.stat-card.warning::before { background: linear-gradient(135deg, #f59e0b, #f97316); }
.stat-card.danger::before { background: linear-gradient(135deg, #ef4444, #dc2626); }
.stat-card.success::before { background: linear-gradient(135deg, #10b981, #059669); }

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
}

.stat-card .icon {
    font-size: 40px;
    margin-bottom: 10px;
}

.stat-card .value {
    font-size: 32px;
    font-weight: 800;
    color: var(--dark);
    margin: 5px 0;
}

.stat-card .label {
    color: var(--gray);
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
}

.btn-success {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
}

.btn-warning {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white;
}

.btn-sm {
    padding: 8px 14px;
    font-size: 12px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark);
    font-size: 14px;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 14px;
    transition: all 0.3s ease;
    background: var(--light);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    background: white;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

/* Tables */
.table-container {
    overflow-x: auto;
    border-radius: 12px;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

table thead {
    background: var(--gradient);
    color: white;
}

table th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 1px;
}

table td {
    padding: 15px;
    border-bottom: 1px solid var(--border);
}

table tbody tr {
    transition: background 0.2s ease;
}

table tbody tr:hover {
    background: var(--light);
}

/* Badges */
.badge {
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    display: inline-block;
}

.badge-success { background: #d1fae5; color: #065f46; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-info { background: #dbeafe; color: #1e40af; }

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(5px);
}

.modal.active {
    display: flex;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: white;
    border-radius: 16px;
    padding: 30px;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease;
}

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

@keyframes slideUp {
    from { transform: translateY(50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* Scanner */
.scanner-input {
    font-size: 24px;
    padding: 20px;
    text-align: center;
    border: 3px dashed var(--primary);
    background: linear-gradient(135deg, #eef2ff, #fce7f3);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { border-color: var(--primary); }
    50% { border-color: var(--secondary); }
}

/* PDV */
.pdv-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 25px;
}

.cart-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: var(--light);
    border-radius: 10px;
    margin-bottom: 10px;
    transition: all 0.3s ease;
}

.cart-item:hover {
    background: #e0e7ff;
    transform: translateX(5px);
}

.cart-total {
    background: var(--gradient);
    color: white;
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    margin-top: 20px;
}

.cart-total .value {
    font-size: 36px;
    font-weight: 800;
}

/* Alerts */
.alert {
    padding: 15px 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { transform: translateX(-20px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.alert-warning {
    background: #fef3c7;
    color: #92400e;
    border-left: 4px solid #f59e0b;
}

.alert-danger {
    background: #fee2e2;
    color: #991b1b;
    border-left: 4px solid #ef4444;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border-left: 4px solid #10b981;
}

/* Search */
.search-box {
    position: relative;
    margin-bottom: 20px;
}

.search-box input {
    width: 100%;
    padding: 14px 20px 14px 50px;
    border: 2px solid var(--border);
    border-radius: 12px;
    font-size: 15px;
    transition: all 0.3s ease;
}

.search-box::before {
    content: "🔍";
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 18px;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
    }
    .main-content {
        margin-left: 0;
    }
    .pdv-layout {
        grid-template-columns: 1fr;
    }
}