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

:root {
    --primary: #FF6B35;
    --primary-dark: #E85A2D;
    --secondary: #004E89;
    --accent: #1A936F;
    --success: #2ECC71;
    --warning: #F39C12;
    --danger: #E74C3C;
    --info: #3498DB;
    --light: #F8F9FA;
    --dark: #2C3E50;
    --gray: #95A5A6;
    --border: #E0E0E0;
    --pastel-blue: #E3F2FD;
    --pastel-green: #E8F5E9;
    --pastel-orange: #FFF3E0;
    --shadow: 0 4px 6px rgba(0,0,0,0.07);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
    --radius: 12px;
}

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--dark);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.98);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--pastel-blue) 0%, #BBDEFB 100%);
    padding: 25px 20px;
    border-bottom: 4px solid var(--primary);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-img {
    max-height: 80px;
    width: auto;
    object-fit: contain;
}

.logo-fallback {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-fallback i {
    font-size: 3rem;
    color: var(--primary);
}

.logo-fallback h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--secondary);
}

.logo-fallback p {
    color: var(--secondary);
    font-size: 0.9rem;
}

.razon-social {
    text-align: right;
    padding: 10px 20px;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.razon-social strong {
    display: block;
    color: var(--secondary);
    font-size: 1.2rem;
}

.razon-social span {
    color: var(--gray);
    font-size: 0.9rem;
}

/* Formulario */
.formulario {
    padding: 40px 30px;
}

.seccion {
    margin-bottom: 35px;
    padding: 30px;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border-left: 5px solid var(--primary);
}

.seccion-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--pastel-blue);
}

.seccion-header i {
    font-size: 1.8rem;
    color: var(--primary);
}

.seccion-header h2 {
    color: var(--secondary);
    font-size: 1.4rem;
    font-weight: 600;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.full-width {
    grid-column: 1 / -1;
}

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

.form-group.required label::after {
    content: " *";
    color: var(--danger);
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark);
    font-size: 0.95rem;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="date"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.3s;
    background: white;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.1);
}

textarea {
    resize: vertical;
    min-height: 80px;
}

/* Selector de cliente */
.cliente-selector {
    margin-bottom: 20px;
    padding: 15px;
    background: var(--pastel-blue);
    border-radius: 8px;
}

.cliente-selector label {
    margin-bottom: 10px;
}

/* Items */
.items-container {
    margin-bottom: 20px;
}

.item-row {
    background: var(--light);
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    border: 2px solid var(--border);
}

.item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border);
}

.item-number {
    font-weight: 600;
    color: var(--secondary);
    font-size: 1.1rem;
}

.btn-remove-item {
    background: var(--danger);
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s;
}

.btn-remove-item:hover {
    background: #C0392B;
    transform: translateY(-2px);
}

.btn-add-item {
    background: var(--accent);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-add-item:hover {
    background: #148F77;
    transform: translateY(-2px);
}

.subtotal-item {
    background: white;
    padding: 12px 15px;
    border-radius: 8px;
    font-weight: 600;
    color: var(--secondary);
    font-size: 1.1rem;
    border: 2px solid var(--border);
}

/* Totales */
.totales-container {
    background: var(--pastel-orange);
    padding: 25px;
    border-radius: 10px;
    margin-top: 30px;
}

.total-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

.total-row:last-child {
    border-bottom: none;
}

.total-row label {
    font-weight: 600;
    font-size: 1rem;
    margin: 0;
}

.total-row span {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--secondary);
}

.descuento-input {
    display: flex;
    align-items: center;
    gap: 10px;
}

.descuento-input input {
    width: 80px;
    padding: 8px;
    text-align: center;
}

.total-final {
    background: var(--secondary);
    color: white;
    padding: 15px 20px;
    border-radius: 8px;
    margin-top: 10px;
}

.total-final label,
.total-final span {
    color: white;
    font-size: 1.3rem;
}

.igv-row label {
    display: flex;
    align-items: center;
    gap: 10px;
}

.igv-row input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--primary);
}

/* Botones */
.acciones {
    display: flex;
    gap: 15px;
    justify-content: flex-end;
    margin-top: 40px;
    padding-top: 30px;
    border-top: 3px solid var(--pastel-blue);
}

.btn {
    padding: 14px 30px;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s;
    font-family: inherit;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(255, 107, 53, 0.4);
}

.btn-secondary {
    background: white;
    color: var(--dark);
    border: 2px solid var(--border);
}

.btn-secondary:hover {
    background: var(--light);
    border-color: var(--primary);
}

/* Footer */
.footer {
    background: linear-gradient(135deg, #E8F4F8 0%, #D4E6F1 100%);
    color: var(--dark);
    padding: 25px 30px;
    border-top: 4px solid var(--secondary);
}

.footer-content {
    text-align: center;
}

.footer-info p {
    margin: 8px 0;
    font-size: 0.9rem;
}

.footer-info i {
    margin-right: 6px;
    color: var(--primary);
}

.copyright {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid rgba(0, 78, 137, 0.2);
    font-size: 0.85rem;
    color: var(--gray);
}

/* Responsive */
@media (max-width: 768px) {
    body { padding: 10px; }
    .container { border-radius: 12px; }
    .header { padding: 20px 15px; }
    .header-content { flex-direction: column; text-align: center; }
    .razon-social { text-align: center; }
    .formulario { padding: 25px 20px; }
    .seccion { padding: 20px; }
    .grid-2 { grid-template-columns: 1fr; }
    .acciones { flex-direction: column; }
    .btn { width: 100%; justify-content: center; }
    .total-row { flex-direction: column; align-items: flex-start; gap: 10px; }
}

@media (max-width: 480px) {
    .logo-img { max-height: 60px; }
    .logo-fallback h1 { font-size: 1.5rem; }
    .seccion-header h2 { font-size: 1.2rem; }
}