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

:root {
    --primary: #2563eb;
    --secondary: #64748b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --dark: #1e293b;
    --light: #f8fafc;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--light);
    color: var(--dark);
}

/* ===== LOGIN ===== */
.login-body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary) 0%, #1e40af 100%);
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-card {
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    padding: 40px 30px;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header i {
    font-size: 3em;
    color: var(--primary);
    margin-bottom: 10px;
}

.login-header h1 {
    font-size: 1.8em;
    color: var(--dark);
    margin: 10px 0 5px;
}

.login-header p {
    color: var(--secondary);
    font-size: 0.9em;
    font-weight: 600;
    letter-spacing: 2px;
}

.login-form {
    margin-bottom: 20px;
}

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

.form-group label {
    display: block;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 8px;
    font-size: 0.95em;
}

.form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 1em;
    transition: all 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.password-container {
    position: relative;
    display: flex;
    align-items: center;
}

.password-container input {
    padding-right: 45px;
    margin-bottom: 0;
}

.toggle-password {
    position: absolute;
    right: 12px;
    background: none;
    border: none;
    color: var(--secondary);
    cursor: pointer;
    font-size: 1.1em;
    transition: color 0.3s;
}

.toggle-password:hover {
    color: var(--primary);
}

.btn-login {
    width: 100%;
    padding: 12px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-login:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.alert {
    padding: 12px 15px;
    border-radius: 6px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.login-footer {
    text-align: center;
    color: var(--secondary);
    font-size: 0.85em;
}

/* ===== LAYOUT PRINCIPAL ===== */
.navbar {
    background: white;
    border-bottom: 1px solid var(--border);
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.toggle-sidebar {
    background: none;
    border: none;
    font-size: 1.5em;
    color: var(--dark);
    cursor: pointer;
    display: none;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.3em;
    font-weight: 700;
    color: var(--primary);
}

.navbar-right {
    display: flex;
    align-items: center;
}

.user-menu {
    position: relative;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.user-name {
    font-weight: 600;
    color: var(--dark);
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    margin-top: 10px;
    min-width: 200px;
    z-index: 1000;
    overflow: hidden;
}

.user-menu:hover .dropdown-menu {
    display: block;
}

.dropdown-menu a {
    display: block;
    padding: 12px 20px;
    color: var(--dark);
    text-decoration: none;
    transition: background 0.3s;
    display: flex;
    align-items: center;
    gap: 10px;
}

.dropdown-menu a:hover {
    background: var(--light);
}

.dropdown-menu hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 0;
}

.main-container {
    display: flex;
    min-height: calc(100vh - 60px);
}

/* ===== SIDEBAR ===== */
.sidebar {
    width: 260px;
    background: white;
    border-right: 1px solid var(--border);
    padding: 20px 0;
    overflow-y: auto;
}

.sidebar-nav ul {
    list-style: none;
}

.sidebar-nav li {
    padding: 0 15px;
    margin-bottom: 8px;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 15px;
    color: var(--secondary);
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.3s;
    font-weight: 500;
}

.sidebar-nav a:hover {
    background: var(--light);
    color: var(--primary);
}

.sidebar-nav a.active {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary);
    border-left: 4px solid var(--primary);
    padding-left: 11px;
}

.sidebar-title {
    padding: 15px 15px 5px;
    color: var(--secondary);
    font-size: 0.85em;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.sidebar-nav i {
    font-size: 1.2em;
}

/* ===== CONTENT ===== */
.content {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
}

.content-header {
    margin-bottom: 30px;
}

.content-header h1 {
    font-size: 2em;
    color: var(--dark);
    margin-bottom: 5px;
}

.content-header p {
    color: var(--secondary);
    font-size: 0.95em;
}

/* ===== STATS CARDS ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
    border-left: 4px solid var(--border);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8em;
    color: white;
}

.icon-productos {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    border-left-color: #2563eb;
}

.icon-categorias {
    background: linear-gradient(135deg, #10b981, #059669);
    border-left-color: #059669;
}

.icon-movimientos {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    border-left-color: #d97706;
}

.icon-usuarios {
    background: linear-gradient(135deg, #8b5cf6, #7c3aed);
    border-left-color: #7c3aed;
}

.stat-content h3 {
    font-size: 0.9em;
    color: var(--secondary);
    font-weight: 500;
    margin-bottom: 8px;
}

.stat-number {
    font-size: 2em;
    font-weight: 700;
    color: var(--dark);
}

/* ===== QUICK ACTIONS ===== */
.quick-actions {
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow);
}

.quick-actions h2 {
    font-size: 1.3em;
    color: var(--dark);
    margin-bottom: 20px;
}

.actions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 15px;
}

.action-btn {
    background: linear-gradient(135deg, var(--primary), #1d4ed8);
    color: white;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    text-decoration: none;
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.action-btn:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.action-btn i {
    font-size: 1.8em;
}

.action-btn span {
    font-weight: 600;
    font-size: 0.95em;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .navbar {
        padding: 12px 15px;
    }

    .toggle-sidebar {
        display: block;
    }

    .navbar-brand span {
        display: none;
    }

    .sidebar {
        position: fixed;
        left: 0;
        top: 60px;
        width: 260px;
        height: calc(100vh - 60px);
        z-index: 999;
        transform: translateX(-100%);
        transition: transform 0.3s;
        box-shadow: var(--shadow-lg);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-container {
        flex-direction: column;
    }

    .content {
        padding: 20px 15px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .stat-card {
        flex-direction: column;
        text-align: center;
    }

    .actions-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .login-card {
        padding: 30px 20px;
    }
}

@media (max-width: 480px) {
    .stat-icon {
        width: 50px;
        height: 50px;
        font-size: 1.5em;
    }

    .stat-number {
        font-size: 1.5em;
    }

    .actions-grid {
        grid-template-columns: 1fr;
    }

    .user-name {
        display: none;
    }
}