:root {
    --primary:#00796b;
    --secondary:#004d40;
    --bg:#f5f7fa;
    --card-bg:#ffffff;
    --text-dark:#222;
    --text-light:#555;
    --radius:10px;
    --shadow:0 6px 18px rgba(0,0,0,0.1);
    --transition:0.3s;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg);
    color: var(--text-dark);
    margin:0; padding:20px;
}

/* --- Encabezado estilo dashboard --- */
header {
    display:flex; 
    justify-content:space-between; 
    align-items:center;
    margin-bottom:30px;
    padding:20px 25px;
    border-radius: var(--radius);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color:#fff;
    box-shadow: var(--shadow);
}
header h1 { 
    color:#fff; 
    font-size:1.8rem;
}
.header-link {
    text-decoration:none;
    background: var(--primary); /* mismo color que el header */
    color:#fff;
    padding:8px 15px;
    border-radius: var(--radius);
    transition: var(--transition);
}
.header-link:hover { opacity:0.9; }

main {
    display:flex;
    flex-direction:column;
    gap:30px;
}

/* --- Formulario --- */
.form-section {
    background: var(--card-bg);
    padding:25px 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
form {
    display:flex;
    flex-direction:column;
    gap:15px;
}
form input, form select {
    padding:12px;
    border-radius: var(--radius);
    border:1px solid #ccc;
    font-size:1rem;
}
form input:focus, form select:focus {
    outline:none;
    border-color: var(--primary);
    box-shadow:0 0 8px rgba(0,121,107,0.3);
}

.form-buttons {
    display:flex;
    flex-wrap:wrap;
    gap:10px;
}
.form-buttons button {
    flex:1;
    padding:12px;
    border:none;
    border-radius: var(--radius);
    background: var(--primary); /* mismo color que el header */
    color:#fff;
    font-weight:600;
    cursor:pointer;
    transition: var(--transition);
}
.form-buttons button:hover { opacity:0.9; }

/* --- Tabla --- */
.table-section {
    background: var(--card-bg);
    padding:20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
table {
    width:100%;
    border-collapse:collapse;
    margin-bottom:15px;
}
thead th {
    background: var(--primary);
    color:#fff;
    padding:12px;
    text-align:left;
}
tbody td {
    padding:12px;
    border-bottom:1px solid #eee;
}
.totals {
    display:flex;
    justify-content:flex-end;
    gap:30px;
    font-weight:600;
}

/* --- Responsive --- */
@media screen and (max-width:768px){
    .form-buttons { flex-direction:column; }
    .totals { flex-direction:column; gap:10px; }
}